(function () {
var lang = YAHOO.lang,
util = YAHOO.util,
Ev = util.Event;
/**
* The DataSource utility provides a common configurable interface for widgets to
* access a variety of data, from JavaScript arrays to online database servers.
*
* @module datasource
* @requires yahoo, event
* @optional json, get, connection
* @title DataSource Utility
*/
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/**
* Base class for the YUI DataSource utility.
*
* @namespace YAHOO.util
* @class YAHOO.util.DataSourceBase
* @constructor
* @param oLiveData {HTMLElement} Pointer to live data.
* @param oConfigs {object} (optional) Object literal of configuration values.
*/
util.DataSourceBase = function(oLiveData, oConfigs) {
if(oLiveData === null || oLiveData === undefined) {
YAHOO.log("Could not instantiate DataSource due to invalid live database",
"error", this.toString());
return;
}
this.liveData = oLiveData;
this._oQueue = {interval:null, conn:null, requests:[]};
this.responseSchema = {};
// Set any config params passed in to override defaults
if(oConfigs && (oConfigs.constructor == Object)) {
for(var sConfig in oConfigs) {
if(sConfig) {
this[sConfig] = oConfigs[sConfig];
}
}
}
// Validate and initialize public configs
var maxCacheEntries = this.maxCacheEntries;
if(!lang.isNumber(maxCacheEntries) || (maxCacheEntries < 0)) {
maxCacheEntries = 0;
}
// Initialize interval tracker
this._aIntervals = [];
/////////////////////////////////////////////////////////////////////////////
//
// Custom Events
//
/////////////////////////////////////////////////////////////////////////////
/**
* Fired when a request is made to the local cache.
*
* @event cacheRequestEvent
* @param oArgs.request {Object} The request object.
* @param oArgs.callback {Object} The callback object.
* @param oArgs.caller {Object} (deprecated) Use callback.scope.
*/
this.createEvent("cacheRequestEvent");
/**
* Fired when data is retrieved from the local cache.
*
* @event cacheResponseEvent
* @param oArgs.request {Object} The request object.
* @param oArgs.response {Object} The response object.
* @param oArgs.callback {Object} The callback object.
* @param oArgs.caller {Object} (deprecated) Use callback.scope.
*/
this.createEvent("cacheResponseEvent");
/**
* Fired when a request is sent to the live data source.
*
* @event requestEvent
* @param oArgs.request {Object} The request object.
* @param oArgs.callback {Object} The callback object.
* @param oArgs.tId {Number} Transaction ID.
* @param oArgs.caller {Object} (deprecated) Use callback.scope.
*/
this.createEvent("requestEvent");
/**
* Fired when live data source sends response.
*
* @event responseEvent
* @param oArgs.request {Object} The request object.
* @param oArgs.response {Object} The raw response object.
* @param oArgs.callback {Object} The callback object.
* @param oArgs.tId {Number} Transaction ID.
* @param oArgs.caller {Object} (deprecated) Use callback.scope.
*/
this.createEvent("responseEvent");
/**
* Fired when response is parsed.
*
* @event responseParseEvent
* @param oArgs.request {Object} The request object.
* @param oArgs.response {Object} The parsed response object.
* @param oArgs.callback {Object} The callback object.
* @param oArgs.caller {Object} (deprecated) Use callback.scope.
*/
this.createEvent("responseParseEvent");
/**
* Fired when response is cached.
*
* @event responseCacheEvent
* @param oArgs.request {Object} The request object.
* @param oArgs.response {Object} The parsed response object.
* @param oArgs.callback {Object} The callback object.
* @param oArgs.caller {Object} (deprecated) Use callback.scope.
*/
this.createEvent("responseCacheEvent");
/**
* Fired when an error is encountered with the live data source.
*
* @event dataErrorEvent
* @param oArgs.request {Object} The request object.
* @param oArgs.callback {Object} The callback object.
* @param oArgs.caller {Object} (deprecated) Use callback.scope.
* @param oArgs.message {String} The error message.
*/
this.createEvent("dataErrorEvent");
/**
* Fired when the local cache is flushed.
*
* @event cacheFlushEvent
*/
this.createEvent("cacheFlushEvent");
var DS = util.DataSourceBase;
this._sName = "DataSource instance" + DS._nIndex;
DS._nIndex++;
YAHOO.log("DataSource initialized", "info", this.toString());
};
var DS = util.DataSourceBase;
lang.augmentObject(DS, {
/////////////////////////////////////////////////////////////////////////////
//
// DataSourceBase public constants
//
/////////////////////////////////////////////////////////////////////////////
/**
* Type is unknown.
*
* @property TYPE_UNKNOWN
* @type Number
* @final
* @default -1
*/
TYPE_UNKNOWN : -1,
/**
* Type is a JavaScript Array.
*
* @property TYPE_JSARRAY
* @type Number
* @final
* @default 0
*/
TYPE_JSARRAY : 0,
/**
* Type is a JavaScript Function.
*
* @property TYPE_JSFUNCTION
* @type Number
* @final
* @default 1
*/
TYPE_JSFUNCTION : 1,
/**
* Type is hosted on a server via an XHR connection.
*
* @property TYPE_XHR
* @type Number
* @final
* @default 2
*/
TYPE_XHR : 2,
/**
* Type is JSON.
*
* @property TYPE_JSON
* @type Number
* @final
* @default 3
*/
TYPE_JSON : 3,
/**
* Type is XML.
*
* @property TYPE_XML
* @type Number
* @final
* @default 4
*/
TYPE_XML : 4,
/**
* Type is plain text.
*
* @property TYPE_TEXT
* @type Number
* @final
* @default 5
*/
TYPE_TEXT : 5,
/**
* Type is an HTML TABLE element. Data is parsed out of TR elements from all TBODY elements.
*
* @property TYPE_HTMLTABLE
* @type Number
* @final
* @default 6
*/
TYPE_HTMLTABLE : 6,
/**
* Type is hosted on a server via a dynamic script node.
*
* @property TYPE_SCRIPTNODE
* @type Number
* @final
* @default 7
*/
TYPE_SCRIPTNODE : 7,
/**
* Type is local.
*
* @property TYPE_LOCAL
* @type Number
* @final
* @default 8
*/
TYPE_LOCAL : 8,
/**
* Error message for invalid dataresponses.
*
* @property ERROR_DATAINVALID
* @type String
* @final
* @default "Invalid data"
*/
ERROR_DATAINVALID : "Invalid data",
/**
* Error message for null data responses.
*
* @property ERROR_DATANULL
* @type String
* @final
* @default "Null data"
*/
ERROR_DATANULL : "Null data",
/////////////////////////////////////////////////////////////////////////////
//
// DataSourceBase private static properties
//
/////////////////////////////////////////////////////////////////////////////
/**
* Internal class variable to index multiple DataSource instances.
*
* @property DataSourceBase._nIndex
* @type Number
* @private
* @static
*/
_nIndex : 0,
/**
* Internal class variable to assign unique transaction IDs.
*
* @property DataSourceBase._nTransactionId
* @type Number
* @private
* @static
*/
_nTransactionId : 0,
/////////////////////////////////////////////////////////////////////////////
//
// DataSourceBase public static methods
//
/////////////////////////////////////////////////////////////////////////////
/**
* Executes a configured callback. For object literal callbacks, the third
* param determines whether to execute the success handler or failure handler.
*
* @method issueCallback
* @param callback {Function|Object} the callback to execute
* @param params {Array} params to be passed to the callback method
* @param error {Boolean} whether an error occurred
* @param scope {Object} the scope from which to execute the callback
* (deprecated - use an object literal callback)
* @static
*/
issueCallback : function (callback,params,error,scope) {
if (lang.isFunction(callback)) {
callback.apply(scope, params);
} else if (lang.isObject(callback)) {
scope = callback.scope || scope || window;
var callbackFunc = callback.success;
if (error) {
callbackFunc = callback.failure;
}
if (callbackFunc) {
callbackFunc.apply(scope, params.concat([callback.argument]));
}
}
},
/**
* Converts data to type String.
*
* @method DataSourceBase.parseString
* @param oData {String | Number | Boolean | Date | Array | Object} Data to parse.
* The special values null and undefined will return null.
* @return {String} A string, or null.
* @static
*/
parseString : function(oData) {
// Special case null and undefined
if(!lang.isValue(oData)) {
return null;
}
//Convert to string
var string = oData + "";
// Validate
if(lang.isString(string)) {
return string;
}
else {
YAHOO.log("Could not convert data " + lang.dump(oData) + " to type String", "warn", this.toString());
return null;
}
},
/**
* Converts data to type Number.
*
* @method DataSourceBase.parseNumber
* @param oData {String | Number | Boolean} Data to convert. Note, the following
* values return as null: null, undefined, NaN, "".
* @return {Number} A number, or null.
* @static
*/
parseNumber : function(oData) {
if(!lang.isValue(oData) || (oData === "")) {
return null;
}
//Convert to number
var number = oData * 1;
// Validate
if(lang.isNumber(number)) {
return number;
}
else {
YAHOO.log("Could not convert data " + lang.dump(oData) + " to type Number", "warn", this.toString());
return null;
}
},
// Backward compatibility
convertNumber : function(oData) {
YAHOO.log("The method YAHOO.util.DataSourceBase.convertNumber() has been" +
" deprecated in favor of YAHOO.util.DataSourceBase.parseNumber()", "warn",
this.toString());
return DS.parseNumber(oData);
},
/**
* Converts data to type Date.
*
* @method DataSourceBase.parseDate
* @param oData {Date | String | Number} Data to convert.
* @return {Date} A Date instance.
* @static
*/
parseDate : function(oData) {
var date = null;
//Convert to date
if(!(oData instanceof Date)) {
date = new Date(oData);
}
else {
return oData;
}
// Validate
if(date instanceof Date) {
return date;
}
else {
YAHOO.log("Could not convert data " + lang.dump(oData) + " to type Date", "warn", this.toString());
return null;
}
},
// Backward compatibility
convertDate : function(oData) {
YAHOO.log("The method YAHOO.util.DataSourceBase.convertDate() has been" +
" deprecated in favor of YAHOO.util.DataSourceBase.parseDate()", "warn",
this.toString());
return DS.parseDate(oData);
}
});
// Done in separate step so referenced functions are defined.
/**
* Data parsing functions.
* @property DataSource.Parser
* @type Object
* @static
*/
DS.Parser = {
string : DS.parseString,
number : DS.parseNumber,
date : DS.parseDate
};
// Prototype properties and methods
DS.prototype = {
/////////////////////////////////////////////////////////////////////////////
//
// DataSourceBase private properties
//
/////////////////////////////////////////////////////////////////////////////
/**
* Name of DataSource instance.
*
* @property _sName
* @type String
* @private
*/
_sName : null,
/**
* Local cache of data result object literals indexed chronologically.
*
* @property _aCache
* @type Object[]
* @private
*/
_aCache : null,
/**
* Local queue of request connections, enabled if queue needs to be managed.
*
* @property _oQueue
* @type Object
* @private
*/
_oQueue : null,
/**
* Array of polling interval IDs that have been enabled, needed to clear all intervals.
*
* @property _aIntervals
* @type Array
* @private
*/
_aIntervals : null,
/////////////////////////////////////////////////////////////////////////////
//
// DataSourceBase public properties
//
/////////////////////////////////////////////////////////////////////////////
/**
* Max size of the local cache. Set to 0 to turn off caching. Caching is
* useful to reduce the number of server connections. Recommended only for data
* sources that return comprehensive results for queries or when stale data is
* not an issue.
*
* @property maxCacheEntries
* @type Number
* @default 0
*/
maxCacheEntries : 0,
/**
* Pointer to live database.
*
* @property liveData
* @type Object
*/
liveData : null,
/**
* Where the live data is held:
*
* <dl>
* <dt>TYPE_UNKNOWN</dt>
* <dt>TYPE_LOCAL</dt>
* <dt>TYPE_XHR</dt>
* <dt>TYPE_SCRIPTNODE</dt>
* <dt>TYPE_JSFUNCTION</dt>
* </dl>
*
* @property dataType
* @type Number
* @default YAHOO.util.DataSourceBase.TYPE_UNKNOWN
*
*/
dataType : DS.TYPE_UNKNOWN,
/**
* Format of response:
*
* <dl>
* <dt>TYPE_UNKNOWN</dt>
* <dt>TYPE_JSARRAY</dt>
* <dt>TYPE_JSON</dt>
* <dt>TYPE_XML</dt>
* <dt>TYPE_TEXT</dt>
* <dt>TYPE_HTMLTABLE</dt>
* </dl>
*
* @property responseType
* @type Number
* @default YAHOO.util.DataSourceBase.TYPE_UNKNOWN
*/
responseType : DS.TYPE_UNKNOWN,
/**
* Response schema object literal takes a combination of the following properties:
*
* <dl>
* <dt>resultsList</dt> <dd>Pointer to array of tabular data</dd>
* <dt>resultNode</dt> <dd>Pointer to node name of row data (XML data only)</dd>
* <dt>recordDelim</dt> <dd>Record delimiter (text data only)</dd>
* <dt>fieldDelim</dt> <dd>Field delimiter (text data only)</dd>
* <dt>fields</dt> <dd>Array of field names (aka keys), or array of object literals
* such as: {key:"fieldname",parser:YAHOO.util.DataSourceBase.parseDate}</dd>
* <dt>metaFields</dt> <dd>Object literal of keys to include in the oParsedResponse.meta collection</dd>
* <dt>metaNode</dt> <dd>Name of the node under which to search for meta information in XML response data</dd>
* </dl>
*
* @property responseSchema
* @type Object
*/
responseSchema : null,
/**
* Additional arguments passed to the JSON parse routine. The JSON string
* is the assumed first argument (where applicable). This property is not
* set by default, but the parse methods will use it if present.
*
* @property parseJSONArgs
* @type {MIXED|Array} If an Array, contents are used as individual arguments.
* Otherwise, value is used as an additional argument.
*/
// property intentionally undefined
/////////////////////////////////////////////////////////////////////////////
//
// DataSourceBase public methods
//
/////////////////////////////////////////////////////////////////////////////
/**
* Public accessor to the unique name of the DataSource instance.
*
* @method toString
* @return {String} Unique name of the DataSource instance.
*/
toString : function() {
return this._sName;
},
/**
* Overridable method passes request to cache and returns cached response if any,
* refreshing the hit in the cache as the newest item. Returns null if there is
* no cache hit.
*
* @method getCachedResponse
* @param oRequest {Object} Request object.
* @param oCallback {Object} Callback object.
* @param oCaller {Object} (deprecated) Use callback object.
* @return {Object} Cached response object or null.
*/
getCachedResponse : function(oRequest, oCallback, oCaller) {
var aCache = this._aCache;
// If cache is enabled...
if(this.maxCacheEntries > 0) {
// Initialize local cache
if(!aCache) {
this._aCache = [];
YAHOO.log("Cache initialized", "info", this.toString());
}
// Look in local cache
else {
var nCacheLength = aCache.length;
if(nCacheLength > 0) {
var oResponse = null;
this.fireEvent("cacheRequestEvent", {request:oRequest,callback:oCallback,caller:oCaller});
// Loop through each cached element
for(var i = nCacheLength-1; i >= 0; i--) {
var oCacheElem = aCache[i];
// Defer cache hit logic to a public overridable method
if(this.isCacheHit(oRequest,oCacheElem.request)) {
// The cache returned a hit!
// Grab the cached response
oResponse = oCacheElem.response;
this.fireEvent("cacheResponseEvent", {request:oRequest,response:oResponse,callback:oCallback,caller:oCaller});
// Refresh the position of the cache hit
if(i < nCacheLength-1) {
// Remove element from its original location
aCache.splice(i,1);
// Add as newest
this.addToCache(oRequest, oResponse);
YAHOO.log("Refreshed cache position of the response for \"" + oRequest + "\"", "info", this.toString());
}
// Add a cache flag
oResponse.cached = true;
break;
}
}
YAHOO.log("The cached response for \"" + lang.dump(oRequest) +
"\" is " + lang.dump(oResponse), "info", this.toString());
return oResponse;
}
}
}
else if(aCache) {
this._aCache = null;
YAHOO.log("Cache destroyed", "info", this.toString());
}
return null;
},
/**
* Default overridable method matches given request to given cached request.
* Returns true if is a hit, returns false otherwise. Implementers should
* override this method to customize the cache-matching algorithm.
*
* @method isCacheHit
* @param oRequest {Object} Request object.
* @param oCachedRequest {Object} Cached request object.
* @return {Boolean} True if given request matches cached request, false otherwise.
*/
isCacheHit : function(oRequest, oCachedRequest) {
return (oRequest === oCachedRequest);
},
/**
* Adds a new item to the cache. If cache is full, evicts the stalest item
* before adding the new item.
*
* @method addToCache
* @param oRequest {Object} Request object.
* @param oResponse {Object} Response object to cache.
*/
addToCache : function(oRequest, oResponse) {
var aCache = this._aCache;
if(!aCache) {
return;
}
// If the cache is full, make room by removing stalest element (index=0)
while(aCache.length >= this.maxCacheEntries) {
aCache.shift();
}
// Add to cache in the newest position, at the end of the array
var oCacheElem = {request:oRequest,response:oResponse};
aCache[aCache.length] = oCacheElem;
this.fireEvent("responseCacheEvent", {request:oRequest,response:oResponse});
YAHOO.log("Cached the response for \"" + oRequest + "\"", "info", this.toString());
},
/**
* Flushes cache.
*
* @method flushCache
*/
flushCache : function() {
if(this._aCache) {
this._aCache = [];
this.fireEvent("cacheFlushEvent");
YAHOO.log("Flushed the cache", "info", this.toString());
}
},
/**
* Sets up a polling mechanism to send requests at set intervals and forward
* responses to given callback.
*
* @method setInterval
* @param nMsec {Number} Length of interval in milliseconds.
* @param oRequest {Object} Request object.
* @param oCallback {Function} Handler function to receive the response.
* @param oCaller {Object} (deprecated) Use oCallback.scope.
* @return {Number} Interval ID.
*/
setInterval : function(nMsec, oRequest, oCallback, oCaller) {
if(lang.isNumber(nMsec) && (nMsec >= 0)) {
YAHOO.log("Enabling polling to live data for \"" + oRequest + "\" at interval " + nMsec, "info", this.toString());
var oSelf = this;
var nId = setInterval(function() {
oSelf.makeConnection(oRequest, oCallback, oCaller);
}, nMsec);
this._aIntervals.push(nId);
return nId;
}
else {
YAHOO.log("Could not enable polling to live data for \"" + oRequest + "\" at interval " + nMsec, "info", this.toString());
}
},
/**
* Disables polling mechanism associated with the given interval ID.
*
* @method clearInterval
* @param nId {Number} Interval ID.
*/
clearInterval : function(nId) {
// Remove from tracker if there
var tracker = this._aIntervals || [];
for(var i=tracker.length-1; i>-1; i--) {
if(tracker[i] === nId) {
tracker.splice(i,1);
clearInterval(nId);
}
}
},
/**
* Disables all known polling intervals.
*
* @method clearAllIntervals
*/
clearAllIntervals : function() {
var tracker = this._aIntervals || [];
for(var i=tracker.length-1; i>-1; i--) {
clearInterval(tracker[i]);
}
tracker = [];
},
/**
* First looks for cached response, then sends request to live data. The
* following arguments are passed to the callback function:
* <dl>
* <dt><code>oRequest</code></dt>
* <dd>The same value that was passed in as the first argument to sendRequest.</dd>
* <dt><code>oParsedResponse</code></dt>
* <dd>An object literal containing the following properties:
* <dl>
* <dt><code>tId</code></dt>
* <dd>Unique transaction ID number.</dd>
* <dt><code>results</code></dt>
* <dd>Schema-parsed data results.</dd>
* <dt><code>error</code></dt>
* <dd>True in cases of data error.</dd>
* <dt><code>cached</code></dt>
* <dd>True when response is returned from DataSource cache.</dd>
* <dt><code>meta</code></dt>
* <dd>Schema-parsed meta data.</dd>
* </dl>
* <dt><code>oPayload</code></dt>
* <dd>The same value as was passed in as <code>argument</code> in the oCallback object literal.</dd>
* </dl>
*
* @method sendRequest
* @param oRequest {Object} Request object.
* @param oCallback {Object} An object literal with the following properties:
* <dl>
* <dt><code>success</code></dt>
* <dd>The function to call when the data is ready.</dd>
* <dt><code>failure</code></dt>
* <dd>The function to call upon a response failure condition.</dd>
* <dt><code>scope</code></dt>
* <dd>The object to serve as the scope for the success and failure handlers.</dd>
* <dt><code>argument</code></dt>
* <dd>Arbitrary data that will be passed back to the success and failure handlers.</dd>
* </dl>
* @param oCaller {Object} (deprecated) Use oCallback.scope.
* @return {Number} Transaction ID, or null if response found in cache.
*/
sendRequest : function(oRequest, oCallback, oCaller) {
// First look in cache
var oCachedResponse = this.getCachedResponse(oRequest, oCallback, oCaller);
if(oCachedResponse) {
DS.issueCallback(oCallback,[oRequest,oCachedResponse],false,oCaller);
return null;
}
// Not in cache, so forward request to live data
YAHOO.log("Making connection to live data for \"" + oRequest + "\"", "info", this.toString());
return this.makeConnection(oRequest, oCallback, oCaller);
},
/**
* Overridable default method generates a unique transaction ID and passes
* the live data reference directly to the handleResponse function. This
* method should be implemented by subclasses to achieve more complex behavior
* or to access remote data.
*
* @method makeConnection
* @param oRequest {Object} Request object.
* @param oCallback {Object} Callback object literal.
* @param oCaller {Object} (deprecated) Use oCallback.scope.
* @return {Number} Transaction ID.
*/
makeConnection : function(oRequest, oCallback, oCaller) {
var tId = DS._nTransactionId++;
this.fireEvent("requestEvent", {tId:tId, request:oRequest,callback:oCallback,caller:oCaller});
/* accounts for the following cases:
YAHOO.util.DataSourceBase.TYPE_UNKNOWN
YAHOO.util.DataSourceBase.TYPE_JSARRAY
YAHOO.util.DataSourceBase.TYPE_JSON
YAHOO.util.DataSourceBase.TYPE_HTMLTABLE
YAHOO.util.DataSourceBase.TYPE_XML
YAHOO.util.DataSourceBase.TYPE_TEXT
*/
var oRawResponse = this.liveData;
this.handleResponse(oRequest, oRawResponse, oCallback, oCaller, tId);
return tId;
},
/**
* Receives raw data response and type converts to XML, JSON, etc as necessary.
* Forwards oFullResponse to appropriate parsing function to get turned into
* oParsedResponse. Calls doBeforeCallback() and adds oParsedResponse to
* the cache when appropriate before calling issueCallback().
*
* The oParsedResponse object literal has the following properties:
* <dl>
* <dd><dt>tId {Number}</dt> Unique transaction ID</dd>
* <dd><dt>results {Array}</dt> Array of parsed data results</dd>
* <dd><dt>meta {Object}</dt> Object literal of meta values</dd>
* <dd><dt>error {Boolean}</dt> (optional) True if there was an error</dd>
* <dd><dt>cached {Boolean}</dt> (optional) True if response was cached</dd>
* </dl>
*
* @method handleResponse
* @param oRequest {Object} Request object
* @param oRawResponse {Object} The raw response from the live database.
* @param oCallback {Object} Callback object literal.
* @param oCaller {Object} (deprecated) Use oCallback.scope.
* @param tId {Number} Transaction ID.
*/
handleResponse : function(oRequest, oRawResponse, oCallback, oCaller, tId) {
this.fireEvent("responseEvent", {tId:tId, request:oRequest, response:oRawResponse,
callback:oCallback, caller:oCaller});
YAHOO.log("Received live data response for \"" + oRequest + "\"", "info", this.toString());
var xhr = (this.dataType == DS.TYPE_XHR) ? true : false;
var oParsedResponse = null;
var oFullResponse = oRawResponse;
// Try to sniff data type if it has not been defined
if(this.responseType === DS.TYPE_UNKNOWN) {
var ctype = (oRawResponse && oRawResponse.getResponseHeader) ? oRawResponse.getResponseHeader["Content-Type"] : null;
if(ctype) {
// xml
if(ctype.indexOf("text/xml") > -1) {
this.responseType = DS.TYPE_XML;
}
else if(ctype.indexOf("application/json") > -1) { // json
this.responseType = DS.TYPE_JSON;
}
else if(ctype.indexOf("text/plain") > -1) { // text
this.responseType = DS.TYPE_TEXT;
}
}
else {
if(YAHOO.lang.isArray(oRawResponse)) { // array
this.responseType = DS.TYPE_JSARRAY;
}
// xml
else if(oRawResponse && oRawResponse.nodeType && oRawResponse.nodeType == 9) {
this.responseType = DS.TYPE_XML;
}
else if(oRawResponse && oRawResponse.nodeName && (oRawResponse.nodeName.toLowerCase() == "table")) { // table
this.responseType = DS.TYPE_HTMLTABLE;
}
else if(YAHOO.lang.isObject(oRawResponse)) { // json
this.responseType = DS.TYPE_JSON;
}
else if(YAHOO.lang.isString(oRawResponse)) { // text
this.responseType = DS.TYPE_TEXT;
}
}
}
switch(this.responseType) {
case DS.TYPE_JSARRAY:
if(xhr && oRawResponse && oRawResponse.responseText) {
oFullResponse = oRawResponse.responseText;
}
try {
// Convert to JS array if it's a string
if(lang.isString(oFullResponse)) {
var parseArgs = [oFullResponse].concat(this.parseJSONArgs);
// Check for YUI JSON Util
if(lang.JSON) {
oFullResponse = lang.JSON.parse.apply(lang.JSON,parseArgs);
}
// Look for JSON parsers using an API similar to json2.js
else if(window.JSON && JSON.parse) {
oFullResponse = JSON.parse.apply(JSON,parseArgs);
}
// Look for JSON parsers using an API similar to json.js
else if(oFullResponse.parseJSON) {
oFullResponse = oFullResponse.parseJSON.apply(oFullResponse,parseArgs.slice(1));
}
// No JSON lib found so parse the string
else {
// Trim leading spaces
while (oFullResponse.length > 0 &&
(oFullResponse.charAt(0) != "{") &&
(oFullResponse.charAt(0) != "[")) {
oFullResponse = oFullResponse.substring(1, oFullResponse.length);
}
if(oFullResponse.length > 0) {
// Strip extraneous stuff at the end
var arrayEnd =
Math.max(oFullResponse.lastIndexOf("]"),oFullResponse.lastIndexOf("}"));
oFullResponse = oFullResponse.substring(0,arrayEnd+1);
// Turn the string into an object literal...
// ...eval is necessary here
oFullResponse = eval("(" + oFullResponse + ")");
}
}
}
}
catch(e1) {
}
oFullResponse = this.doBeforeParseData(oRequest, oFullResponse, oCallback);
oParsedResponse = this.parseArrayData(oRequest, oFullResponse);
break;
case DS.TYPE_JSON:
if(xhr && oRawResponse && oRawResponse.responseText) {
oFullResponse = oRawResponse.responseText;
}
try {
// Convert to JSON object if it's a string
if(lang.isString(oFullResponse)) {
var parseArgs = [oFullResponse].concat(this.parseJSONArgs);
// Check for YUI JSON Util
if(lang.JSON) {
oFullResponse = lang.JSON.parse.apply(lang.JSON,parseArgs);
}
// Look for JSON parsers using an API similar to json2.js
else if(window.JSON && JSON.parse) {
oFullResponse = JSON.parse.apply(JSON,parseArgs);
}
// Look for JSON parsers using an API similar to json.js
else if(oFullResponse.parseJSON) {
oFullResponse = oFullResponse.parseJSON.apply(oFullResponse,parseArgs.slice(1));
}
// No JSON lib found so parse the string
else {
// Trim leading spaces
while (oFullResponse.length > 0 &&
(oFullResponse.charAt(0) != "{") &&
(oFullResponse.charAt(0) != "[")) {
oFullResponse = oFullResponse.substring(1, oFullResponse.length);
}
if(oFullResponse.length > 0) {
// Strip extraneous stuff at the end
var objEnd = Math.max(oFullResponse.lastIndexOf("]"),oFullResponse.lastIndexOf("}"));
oFullResponse = oFullResponse.substring(0,objEnd+1);
// Turn the string into an object literal...
// ...eval is necessary here
oFullResponse = eval("(" + oFullResponse + ")");
}
}
}
}
catch(e) {
}
oFullResponse = this.doBeforeParseData(oRequest, oFullResponse, oCallback);
oParsedResponse = this.parseJSONData(oRequest, oFullResponse);
break;
case DS.TYPE_HTMLTABLE:
if(xhr && oRawResponse.responseText) {
var el = document.createElement('div');
el.innerHTML = oRawResponse.responseText;
oFullResponse = el.getElementsByTagName('table')[0];
}
oFullResponse = this.doBeforeParseData(oRequest, oFullResponse, oCallback);
oParsedResponse = this.parseHTMLTableData(oRequest, oFullResponse);
break;
case DS.TYPE_XML:
if(xhr && oRawResponse.responseXML) {
oFullResponse = oRawResponse.responseXML;
}
oFullResponse = this.doBeforeParseData(oRequest, oFullResponse, oCallback);
oParsedResponse = this.parseXMLData(oRequest, oFullResponse);
break;
case DS.TYPE_TEXT:
if(xhr && lang.isString(oRawResponse.responseText)) {
oFullResponse = oRawResponse.responseText;
}
oFullResponse = this.doBeforeParseData(oRequest, oFullResponse, oCallback);
oParsedResponse = this.parseTextData(oRequest, oFullResponse);
break;
default:
oFullResponse = this.doBeforeParseData(oRequest, oFullResponse, oCallback);
oParsedResponse = this.parseData(oRequest, oFullResponse);
break;
}
// Clean up for consistent signature
oParsedResponse = oParsedResponse || {};
if(!oParsedResponse.results) {
oParsedResponse.results = [];
}
if(!oParsedResponse.meta) {
oParsedResponse.meta = {};
}
// Success
if(oParsedResponse && !oParsedResponse.error) {
// Last chance to touch the raw response or the parsed response
oParsedResponse = this.doBeforeCallback(oRequest, oFullResponse, oParsedResponse, oCallback);
this.fireEvent("responseParseEvent", {request:oRequest,
response:oParsedResponse, callback:oCallback, caller:oCaller});
// Cache the response
this.addToCache(oRequest, oParsedResponse);
}
// Error
else {
// Be sure the error flag is on
oParsedResponse.error = true;
this.fireEvent("dataErrorEvent", {request:oRequest, response: oRawResponse, callback:oCallback,
caller:oCaller, message:DS.ERROR_DATANULL});
YAHOO.log(DS.ERROR_DATANULL, "error", this.toString());
}
// Send the response back to the caller
oParsedResponse.tId = tId;
DS.issueCallback(oCallback,[oRequest,oParsedResponse],oParsedResponse.error,oCaller);
},
/**
* Overridable method gives implementers access to the original full response
* before the data gets parsed. Implementers should take care not to return an
* unparsable or otherwise invalid response.
*
* @method doBeforeParseData
* @param oRequest {Object} Request object.
* @param oFullResponse {Object} The full response from the live database.
* @param oCallback {Object} The callback object.
* @return {Object} Full response for parsing.
*/
doBeforeParseData : function(oRequest, oFullResponse, oCallback) {
return oFullResponse;
},
/**
* Overridable method gives implementers access to the original full response and
* the parsed response (parsed against the given schema) before the data
* is added to the cache (if applicable) and then sent back to callback function.
* This is your chance to access the raw response and/or populate the parsed
* response with any custom data.
*
* @method doBeforeCallback
* @param oRequest {Object} Request object.
* @param oFullResponse {Object} The full response from the live database.
* @param oParsedResponse {Object} The parsed response to return to calling object.
* @param oCallback {Object} The callback object.
* @return {Object} Parsed response object.
*/
doBeforeCallback : function(oRequest, oFullResponse, oParsedResponse, oCallback) {
return oParsedResponse;
},
/**
* Overridable method parses data of generic RESPONSE_TYPE into a response object.
*
* @method parseData
* @param oRequest {Object} Request object.
* @param oFullResponse {Object} The full Array from the live database.
* @return {Object} Parsed response object with the following properties:<br>
* - results {Array} Array of parsed data results<br>
* - meta {Object} Object literal of meta values<br>
* - error {Boolean} (optional) True if there was an error<br>
*/
parseData : function(oRequest, oFullResponse) {
if(lang.isValue(oFullResponse)) {
var oParsedResponse = {results:oFullResponse,meta:{}};
YAHOO.log("Parsed generic data is " +
lang.dump(oParsedResponse), "info", this.toString());
return oParsedResponse;
}
YAHOO.log("Generic data could not be parsed: " + lang.dump(oFullResponse),
"error", this.toString());
return null;
},
/**
* Overridable method parses Array data into a response object.
*
* @method parseArrayData
* @param oRequest {Object} Request object.
* @param oFullResponse {Object} The full Array from the live database.
* @return {Object} Parsed response object with the following properties:<br>
* - results (Array) Array of parsed data results<br>
* - error (Boolean) True if there was an error
*/
parseArrayData : function(oRequest, oFullResponse) {
if(lang.isArray(oFullResponse)) {
var results = [],
i, j,
rec, field, data;
// Parse for fields
if(lang.isArray(this.responseSchema.fields)) {
var fields = this.responseSchema.fields;
for (i = fields.length - 1; i >= 0; --i) {
if (typeof fields[i] !== 'object') {
fields[i] = { key : fields[i] };
}
}
var parsers = {}, p;
for (i = fields.length - 1; i >= 0; --i) {
p = (typeof fields[i].parser === 'function' ?
fields[i].parser :
DS.Parser[fields[i].parser+'']) || fields[i].converter;
if (p) {
parsers[fields[i].key] = p;
}
}
var arrType = lang.isArray(oFullResponse[0]);
for(i=oFullResponse.length-1; i>-1; i--) {
var oResult = {};
rec = oFullResponse[i];
if (typeof rec === 'object') {
for(j=fields.length-1; j>-1; j--) {
field = fields[j];
data = arrType ? rec[j] : rec[field.key];
if (parsers[field.key]) {
data = parsers[field.key].call(this,data);
}
// Safety measure
if(data === undefined) {
data = null;
}
oResult[field.key] = data;
}
}
else if (lang.isString(rec)) {
for(j=fields.length-1; j>-1; j--) {
field = fields[j];
data = rec;
if (parsers[field.key]) {
data = parsers[field.key].call(this,data);
}
// Safety measure
if(data === undefined) {
data = null;
}
oResult[field.key] = data;
}
}
results[i] = oResult;
}
}
// Return entire data set
else {
results = oFullResponse;
}
var oParsedResponse = {results:results};
YAHOO.log("Parsed array data is " +
lang.dump(oParsedResponse), "info", this.toString());
return oParsedResponse;
}
YAHOO.log("Array data could not be parsed: " + lang.dump(oFullResponse),
"error", this.toString());
return null;
},
/**
* Overridable method parses plain text data into a response object.
*
* @method parseTextData
* @param oRequest {Object} Request object.
* @param oFullResponse {Object} The full text response from the live database.
* @return {Object} Parsed response object with the following properties:<br>
* - results (Array) Array of parsed data results<br>
* - error (Boolean) True if there was an error
*/
parseTextData : function(oRequest, oFullResponse) {
if(lang.isString(oFullResponse)) {
if(lang.isString(this.responseSchema.recordDelim) &&
lang.isString(this.responseSchema.fieldDelim)) {
var oParsedResponse = {results:[]};
var recDelim = this.responseSchema.recordDelim;
var fieldDelim = this.responseSchema.fieldDelim;
if(oFullResponse.length > 0) {
// Delete the last line delimiter at the end of the data if it exists
var newLength = oFullResponse.length-recDelim.length;
if(oFullResponse.substr(newLength) == recDelim) {
oFullResponse = oFullResponse.substr(0, newLength);
}
if(oFullResponse.length > 0) {
// Split along record delimiter to get an array of strings
var recordsarray = oFullResponse.split(recDelim);
// Cycle through each record
for(var i = 0, len = recordsarray.length, recIdx = 0; i < len; ++i) {
var bError = false,
sRecord = recordsarray[i];
if (lang.isString(sRecord) && (sRecord.length > 0)) {
// Split each record along field delimiter to get data
var fielddataarray = recordsarray[i].split(fieldDelim);
var oResult = {};
// Filter for fields data
if(lang.isArray(this.responseSchema.fields)) {
var fields = this.responseSchema.fields;
for(var j=fields.length-1; j>-1; j--) {
try {
// Remove quotation marks from edges, if applicable
var data = fielddataarray[j];
if (lang.isString(data)) {
if(data.charAt(0) == "\"") {
data = data.substr(1);
}
if(data.charAt(data.length-1) == "\"") {
data = data.substr(0,data.length-1);
}
var field = fields[j];
var key = (lang.isValue(field.key)) ? field.key : field;
// Backward compatibility
if(!field.parser && field.converter) {
field.parser = field.converter;
YAHOO.log("The field property converter has been deprecated" +
" in favor of parser", "warn", this.toString());
}
var parser = (typeof field.parser === 'function') ?
field.parser :
DS.Parser[field.parser+''];
if(parser) {
data = parser.call(this, data);
}
// Safety measure
if(data === undefined) {
data = null;
}
oResult[key] = data;
}
else {
bError = true;
}
}
catch(e) {
bError = true;
}
}
}
// No fields defined so pass along all data as an array
else {
oResult = fielddataarray;
}
if(!bError) {
oParsedResponse.results[recIdx++] = oResult;
}
}
}
}
}
YAHOO.log("Parsed text data is " +
lang.dump(oParsedResponse), "info", this.toString());
return oParsedResponse;
}
}
YAHOO.log("Text data could not be parsed: " + lang.dump(oFullResponse),
"error", this.toString());
return null;
},
/**
* Overridable method parses XML data for one result into an object literal.
*
* @method parseXMLResult
* @param result {XML} XML for one result.
* @return {Object} Object literal of data for one result.
*/
parseXMLResult : function(result) {
var oResult = {},
schema = this.responseSchema;
try {
// Loop through each data field in each result using the schema
for(var m = schema.fields.length-1; m >= 0 ; m--) {
var field = schema.fields[m];
var key = (lang.isValue(field.key)) ? field.key : field;
var data = null;
// Values may be held in an attribute...
var xmlAttr = result.attributes.getNamedItem(key);
if(xmlAttr) {
data = xmlAttr.value;
}
// ...or in a node
else {
var xmlNode = result.getElementsByTagName(key);
if(xmlNode && xmlNode.item(0)) {
var item = xmlNode.item(0);
// For IE, then DOM...
data = (item) ? ((item.text) ? item.text : (item.textContent) ? item.textContent : null) : null;
// ...then fallback, but check for multiple child nodes
if(!data) {
var datapieces = [];
for(var j=0, len=item.childNodes.length; j<len; j++) {
if(item.childNodes[j].nodeValue) {
datapieces[datapieces.length] = item.childNodes[j].nodeValue;
}
}
if(datapieces.length > 0) {
data = datapieces.join("");
}
}
}
}
// Safety net
if(data === null) {
data = "";
}
// Backward compatibility
if(!field.parser && field.converter) {
field.parser = field.converter;
YAHOO.log("The field property converter has been deprecated" +
" in favor of parser", "warn", this.toString());
}
var parser = (typeof field.parser === 'function') ?
field.parser :
DS.Parser[field.parser+''];
if(parser) {
data = parser.call(this, data);
}
// Safety measure
if(data === undefined) {
data = null;
}
oResult[key] = data;
}
}
catch(e) {
YAHOO.log("Error while parsing XML result: " + e.message);
}
return oResult;
},
/**
* Overridable method parses XML data into a response object.
*
* @method parseXMLData
* @param oRequest {Object} Request object.
* @param oFullResponse {Object} The full XML response from the live database.
* @return {Object} Parsed response object with the following properties<br>
* - results (Array) Array of parsed data results<br>
* - error (Boolean) True if there was an error
*/
parseXMLData : function(oRequest, oFullResponse) {
var bError = false,
schema = this.responseSchema,
oParsedResponse = {meta:{}},
xmlList = null,
metaNode = schema.metaNode,
metaLocators = schema.metaFields || {},
i,k,loc,v;
// In case oFullResponse is something funky
try {
xmlList = (schema.resultNode) ?
oFullResponse.getElementsByTagName(schema.resultNode) :
null;
// Pull any meta identified
metaNode = metaNode ? oFullResponse.getElementsByTagName(metaNode)[0] :
oFullResponse;
if (metaNode) {
for (k in metaLocators) {
if (lang.hasOwnProperty(metaLocators, k)) {
loc = metaLocators[k];
// Look for a node
v = metaNode.getElementsByTagName(loc)[0];
if (v) {
v = v.firstChild.nodeValue;
} else {
// Look for an attribute
v = metaNode.attributes.getNamedItem(loc);
if (v) {
v = v.value;
}
}
if (lang.isValue(v)) {
oParsedResponse.meta[k] = v;
}
}
}
}
}
catch(e) {
YAHOO.log("Error while parsing XML data: " + e.message);
}
if(!xmlList || !lang.isArray(schema.fields)) {
bError = true;
}
// Loop through each result
else {
oParsedResponse.results = [];
for(i = xmlList.length-1; i >= 0 ; --i) {
var oResult = this.parseXMLResult(xmlList.item(i));
// Capture each array of values into an array of results
oParsedResponse.results[i] = oResult;
}
}
if(bError) {
YAHOO.log("XML data could not be parsed: " +
lang.dump(oFullResponse), "error", this.toString());
oParsedResponse.error = true;
}
else {
YAHOO.log("Parsed XML data is " +
lang.dump(oParsedResponse), "info", this.toString());
}
return oParsedResponse;
},
/**
* Overridable method parses JSON data into a response object.
*
* @method parseJSONData
* @param oRequest {Object} Request object.
* @param oFullResponse {Object} The full JSON from the live database.
* @return {Object} Parsed response object with the following properties<br>
* - results (Array) Array of parsed data results<br>
* - error (Boolean) True if there was an error
*/
parseJSONData : function(oRequest, oFullResponse) {
var oParsedResponse = {results:[],meta:{}};
if(lang.isObject(oFullResponse) && this.responseSchema.resultsList) {
var schema = this.responseSchema,
fields = schema.fields,
resultsList = oFullResponse,
results = [],
metaFields = schema.metaFields || {},
fieldParsers = [],
fieldPaths = [],
simpleFields = [],
bError = false,
i,len,j,v,key,parser,path;
// Function to convert the schema's fields into walk paths
var buildPath = function (needle) {
var path = null, keys = [], i = 0;
if (needle) {
// Strip the ["string keys"] and [1] array indexes
needle = needle.
replace(/\[(['"])(.*?)\1\]/g,
function (x,$1,$2) {keys[i]=$2;return '.@'+(i++);}).
replace(/\[(\d+)\]/g,
function (x,$1) {keys[i]=parseInt($1,10)|0;return '.@'+(i++);}).
replace(/^\./,''); // remove leading dot
// If the cleaned needle contains invalid characters, the
// path is invalid
if (!/[^\w\.\$@]/.test(needle)) {
path = needle.split('.');
for (i=path.length-1; i >= 0; --i) {
if (path[i].charAt(0) === '@') {
path[i] = keys[parseInt(path[i].substr(1),10)];
}
}
}
else {
YAHOO.log("Invalid locator: " + needle, "error", this.toString());
}
}
return path;
};
// Function to walk a path and return the pot of gold
var walkPath = function (path, origin) {
var v=origin,i=0,len=path.length;
for (;i<len && v;++i) {
v = v[path[i]];
}
return v;
};
// Parse the response
// Step 1. Pull the resultsList from oFullResponse (default assumes
// oFullResponse IS the resultsList)
path = buildPath(schema.resultsList);
if (path) {
resultsList = walkPath(path, oFullResponse);
if (resultsList === undefined) {
bError = true;
}
} else {
bError = true;
}
if (!resultsList) {
resultsList = [];
}
if (!lang.isArray(resultsList)) {
resultsList = [resultsList];
}
if (!bError) {
// Step 2. Parse out field data if identified
if(schema.fields) {
var field;
// Build the field parser map and location paths
for (i=0, len=fields.length; i<len; i++) {
field = fields[i];
key = field.key || field;
parser = ((typeof field.parser === 'function') ?
field.parser :
DS.Parser[field.parser+'']) || field.converter;
path = buildPath(key);
if (parser) {
fieldParsers[fieldParsers.length] = {key:key,parser:parser};
}
if (path) {
if (path.length > 1) {
fieldPaths[fieldPaths.length] = {key:key,path:path};
} else {
simpleFields[simpleFields.length] = {key:key,path:path[0]};
}
} else {
YAHOO.log("Invalid key syntax: " + key,"warn",this.toString());
}
}
// Process the results, flattening the records and/or applying parsers if needed
for (i = resultsList.length - 1; i >= 0; --i) {
var r = resultsList[i], rec = {};
if(r) {
for (j = simpleFields.length - 1; j >= 0; --j) {
// Bug 1777850: data might be held in an array
rec[simpleFields[j].key] =
(r[simpleFields[j].path] !== undefined) ?
r[simpleFields[j].path] : r[j];
}
for (j = fieldPaths.length - 1; j >= 0; --j) {
rec[fieldPaths[j].key] = walkPath(fieldPaths[j].path,r);
}
for (j = fieldParsers.length - 1; j >= 0; --j) {
var p = fieldParsers[j].key;
rec[p] = fieldParsers[j].parser(rec[p]);
if (rec[p] === undefined) {
rec[p] = null;
}
}
}
results[i] = rec;
}
}
else {
results = resultsList;
}
for (key in metaFields) {
if (lang.hasOwnProperty(metaFields,key)) {
path = buildPath(metaFields[key]);
if (path) {
v = walkPath(path, oFullResponse);
oParsedResponse.meta[key] = v;
}
}
}
} else {
YAHOO.log("JSON data could not be parsed due to invalid responseSchema.resultsList or invalid response: " +
lang.dump(oFullResponse), "error", this.toString());
oParsedResponse.error = true;
}
oParsedResponse.results = results;
}
else {
YAHOO.log("JSON data could not be parsed: " +
lang.dump(oFullResponse), "error", this.toString());
oParsedResponse.error = true;
}
return oParsedResponse;
},
/**
* Overridable method parses an HTML TABLE element reference into a response object.
* Data is parsed out of TR elements from all TBODY elements.
*
* @method parseHTMLTableData
* @param oRequest {Object} Request object.
* @param oFullResponse {Object} The full HTML element reference from the live database.
* @return {Object} Parsed response object with the following properties<br>
* - results (Array) Array of parsed data results<br>
* - error (Boolean) True if there was an error
*/
parseHTMLTableData : function(oRequest, oFullResponse) {
var bError = false;
var elTable = oFullResponse;
var fields = this.responseSchema.fields;
var oParsedResponse = {results:[]};
if(lang.isArray(fields)) {
// Iterate through each TBODY
for(var i=0; i<elTable.tBodies.length; i++) {
var elTbody = elTable.tBodies[i];
// Iterate through each TR
for(var j=elTbody.rows.length-1; j>-1; j--) {
var elRow = elTbody.rows[j];
var oResult = {};
for(var k=fields.length-1; k>-1; k--) {
var field = fields[k];
var key = (lang.isValue(field.key)) ? field.key : field;
var data = elRow.cells[k].innerHTML;
// Backward compatibility
if(!field.parser && field.converter) {
field.parser = field.converter;
YAHOO.log("The field property converter has been deprecated" +
" in favor of parser", "warn", this.toString());
}
var parser = (typeof field.parser === 'function') ?
field.parser :
DS.Parser[field.parser+''];
if(parser) {
data = parser.call(this, data);
}
// Safety measure
if(data === undefined) {
data = null;
}
oResult[key] = data;
}
oParsedResponse.results[j] = oResult;
}
}
}
else {
bError = true;
YAHOO.log("Invalid responseSchema.fields", "error", this.toString());
}
if(bError) {
YAHOO.log("HTML TABLE data could not be parsed: " +
lang.dump(oFullResponse), "error", this.toString());
oParsedResponse.error = true;
}
else {
YAHOO.log("Parsed HTML TABLE data is " +
lang.dump(oParsedResponse), "info", this.toString());
}
return oParsedResponse;
}
};
// DataSourceBase uses EventProvider
lang.augmentProto(DS, util.EventProvider);
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/**
* LocalDataSource class for in-memory data structs including JavaScript arrays,
* JavaScript object literals (JSON), XML documents, and HTML tables.
*
* @namespace YAHOO.util
* @class YAHOO.util.LocalDataSource
* @extends YAHOO.util.DataSourceBase
* @constructor
* @param oLiveData {HTMLElement} Pointer to live data.
* @param oConfigs {object} (optional) Object literal of configuration values.
*/
util.LocalDataSource = function(oLiveData, oConfigs) {
this.dataType = DS.TYPE_LOCAL;
if(oLiveData) {
if(YAHOO.lang.isArray(oLiveData)) { // array
this.responseType = DS.TYPE_JSARRAY;
}
// xml
else if(oLiveData.nodeType && oLiveData.nodeType == 9) {
this.responseType = DS.TYPE_XML;
}
else if(oLiveData.nodeName && (oLiveData.nodeName.toLowerCase() == "table")) { // table
this.responseType = DS.TYPE_HTMLTABLE;
oLiveData = oLiveData.cloneNode(true);
}
else if(YAHOO.lang.isString(oLiveData)) { // text
this.responseType = DS.TYPE_TEXT;
}
else if(YAHOO.lang.isObject(oLiveData)) { // json
this.responseType = DS.TYPE_JSON;
}
}
else {
oLiveData = [];
this.responseType = DS.TYPE_JSARRAY;
}
util.LocalDataSource.superclass.constructor.call(this, oLiveData, oConfigs);
};
// LocalDataSource extends DataSourceBase
lang.extend(util.LocalDataSource, DS);
// Copy static members to LocalDataSource class
lang.augmentObject(util.LocalDataSource, DS);
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/**
* FunctionDataSource class for JavaScript functions.
*
* @namespace YAHOO.util
* @class YAHOO.util.FunctionDataSource
* @extends YAHOO.util.DataSourceBase
* @constructor
* @param oLiveData {HTMLElement} Pointer to live data.
* @param oConfigs {object} (optional) Object literal of configuration values.
*/
util.FunctionDataSource = function(oLiveData, oConfigs) {
this.dataType = DS.TYPE_JSFUNCTION;
oLiveData = oLiveData || function() {};
util.FunctionDataSource.superclass.constructor.call(this, oLiveData, oConfigs);
};
// FunctionDataSource extends DataSourceBase
lang.extend(util.FunctionDataSource, DS, {
/////////////////////////////////////////////////////////////////////////////
//
// FunctionDataSource public properties
//
/////////////////////////////////////////////////////////////////////////////
/**
* Context in which to execute the function. By default, is the DataSource
* instance itself. If set, the function will receive the DataSource instance
* as an additional argument.
*
* @property scope
* @type Object
* @default null
*/
scope : null,
/////////////////////////////////////////////////////////////////////////////
//
// FunctionDataSource public methods
//
/////////////////////////////////////////////////////////////////////////////
/**
* Overriding method passes query to a function. The returned response is then
* forwarded to the handleResponse function.
*
* @method makeConnection
* @param oRequest {Object} Request object.
* @param oCallback {Object} Callback object literal.
* @param oCaller {Object} (deprecated) Use oCallback.scope.
* @return {Number} Transaction ID.
*/
makeConnection : function(oRequest, oCallback, oCaller) {
var tId = DS._nTransactionId++;
this.fireEvent("requestEvent", {tId:tId,request:oRequest,callback:oCallback,caller:oCaller});
// Pass the request in as a parameter and
// forward the return value to the handler
var oRawResponse = (this.scope) ? this.liveData.call(this.scope, oRequest, this) : this.liveData(oRequest);
// Try to sniff data type if it has not been defined
if(this.responseType === DS.TYPE_UNKNOWN) {
if(YAHOO.lang.isArray(oRawResponse)) { // array
this.responseType = DS.TYPE_JSARRAY;
}
// xml
else if(oRawResponse && oRawResponse.nodeType && oRawResponse.nodeType == 9) {
this.responseType = DS.TYPE_XML;
}
else if(oRawResponse && oRawResponse.nodeName && (oRawResponse.nodeName.toLowerCase() == "table")) { // table
this.responseType = DS.TYPE_HTMLTABLE;
}
else if(YAHOO.lang.isObject(oRawResponse)) { // json
this.responseType = DS.TYPE_JSON;
}
else if(YAHOO.lang.isString(oRawResponse)) { // text
this.responseType = DS.TYPE_TEXT;
}
}
this.handleResponse(oRequest, oRawResponse, oCallback, oCaller, tId);
return tId;
}
});
// Copy static members to FunctionDataSource class
lang.augmentObject(util.FunctionDataSource, DS);
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/**
* ScriptNodeDataSource class for accessing remote data via the YUI Get Utility.
*
* @namespace YAHOO.util
* @class YAHOO.util.ScriptNodeDataSource
* @extends YAHOO.util.DataSourceBase
* @constructor
* @param oLiveData {HTMLElement} Pointer to live data.
* @param oConfigs {object} (optional) Object literal of configuration values.
*/
util.ScriptNodeDataSource = function(oLiveData, oConfigs) {
this.dataType = DS.TYPE_SCRIPTNODE;
oLiveData = oLiveData || "";
util.ScriptNodeDataSource.superclass.constructor.call(this, oLiveData, oConfigs);
};
// ScriptNodeDataSource extends DataSourceBase
lang.extend(util.ScriptNodeDataSource, DS, {
/////////////////////////////////////////////////////////////////////////////
//
// ScriptNodeDataSource public properties
//
/////////////////////////////////////////////////////////////////////////////
/**
* Alias to YUI Get Utility, to allow implementers to use a custom class.
*
* @property getUtility
* @type Object
* @default YAHOO.util.Get
*/
getUtility : util.Get,
/**
* Defines request/response management in the following manner:
* <dl>
* <!--<dt>queueRequests</dt>
* <dd>If a request is already in progress, wait until response is returned before sending the next request.</dd>
* <dt>cancelStaleRequests</dt>
* <dd>If a request is already in progress, cancel it before sending the next request.</dd>-->
* <dt>ignoreStaleResponses</dt>
* <dd>Send all requests, but handle only the response for the most recently sent request.</dd>
* <dt>allowAll</dt>
* <dd>Send all requests and handle all responses.</dd>
* </dl>
*
* @property asyncMode
* @type String
* @default "allowAll"
*/
asyncMode : "allowAll",
/**
* Callback string parameter name sent to the remote script. By default,
* requests are sent to
* <URI>?<scriptCallbackParam>=callbackFunction
*
* @property scriptCallbackParam
* @type String
* @default "callback"
*/
scriptCallbackParam : "callback",
/////////////////////////////////////////////////////////////////////////////
//
// ScriptNodeDataSource public methods
//
/////////////////////////////////////////////////////////////////////////////
/**
* Creates a request callback that gets appended to the script URI. Implementers
* can customize this string to match their server's query syntax.
*
* @method generateRequestCallback
* @return {String} String fragment that gets appended to script URI that
* specifies the callback function
*/
generateRequestCallback : function(id) {
return "&" + this.scriptCallbackParam + "=YAHOO.util.ScriptNodeDataSource.callbacks["+id+"]" ;
},
/**
* Overridable method gives implementers access to modify the URI before the dynamic
* script node gets inserted. Implementers should take care not to return an
* invalid URI.
*
* @method doBeforeGetScriptNode
* @param {String} URI to the script
* @return {String} URI to the script
*/
doBeforeGetScriptNode : function(sUri) {
return sUri;
},
/**
* Overriding method passes query to Get Utility. The returned
* response is then forwarded to the handleResponse function.
*
* @method makeConnection
* @param oRequest {Object} Request object.
* @param oCallback {Object} Callback object literal.
* @param oCaller {Object} (deprecated) Use oCallback.scope.
* @return {Number} Transaction ID.
*/
makeConnection : function(oRequest, oCallback, oCaller) {
var tId = DS._nTransactionId++;
this.fireEvent("requestEvent", {tId:tId,request:oRequest,callback:oCallback,caller:oCaller});
// If there are no global pending requests, it is safe to purge global callback stack and global counter
if(util.ScriptNodeDataSource._nPending === 0) {
util.ScriptNodeDataSource.callbacks = [];
util.ScriptNodeDataSource._nId = 0;
}
// ID for this request
var id = util.ScriptNodeDataSource._nId;
util.ScriptNodeDataSource._nId++;
// Dynamically add handler function with a closure to the callback stack
var oSelf = this;
util.ScriptNodeDataSource.callbacks[id] = function(oRawResponse) {
if((oSelf.asyncMode !== "ignoreStaleResponses")||
(id === util.ScriptNodeDataSource.callbacks.length-1)) { // Must ignore stale responses
// Try to sniff data type if it has not been defined
if(oSelf.responseType === DS.TYPE_UNKNOWN) {
if(YAHOO.lang.isArray(oRawResponse)) { // array
oSelf.responseType = DS.TYPE_JSARRAY;
}
// xml
else if(oRawResponse.nodeType && oRawResponse.nodeType == 9) {
oSelf.responseType = DS.TYPE_XML;
}
else if(oRawResponse.nodeName && (oRawResponse.nodeName.toLowerCase() == "table")) { // table
oSelf.responseType = DS.TYPE_HTMLTABLE;
}
else if(YAHOO.lang.isObject(oRawResponse)) { // json
oSelf.responseType = DS.TYPE_JSON;
}
else if(YAHOO.lang.isString(oRawResponse)) { // text
oSelf.responseType = DS.TYPE_TEXT;
}
}
oSelf.handleResponse(oRequest, oRawResponse, oCallback, oCaller, tId);
}
else {
YAHOO.log("DataSource ignored stale response for tId " + tId + "(" + oRequest + ")", "info", oSelf.toString());
}
delete util.ScriptNodeDataSource.callbacks[id];
};
// We are now creating a request
util.ScriptNodeDataSource._nPending++;
var sUri = this.liveData + oRequest + this.generateRequestCallback(id);
sUri = this.doBeforeGetScriptNode(sUri);
YAHOO.log("DataSource is querying URL " + sUri, "info", this.toString());
this.getUtility.script(sUri,
{autopurge: true,
onsuccess: util.ScriptNodeDataSource._bumpPendingDown,
onfail: util.ScriptNodeDataSource._bumpPendingDown});
return tId;
}
});
// Copy static members to ScriptNodeDataSource class
lang.augmentObject(util.ScriptNodeDataSource, DS);
// Copy static members to ScriptNodeDataSource class
lang.augmentObject(util.ScriptNodeDataSource, {
/////////////////////////////////////////////////////////////////////////////
//
// ScriptNodeDataSource private static properties
//
/////////////////////////////////////////////////////////////////////////////
/**
* Unique ID to track requests.
*
* @property _nId
* @type Number
* @private
* @static
*/
_nId : 0,
/**
* Counter for pending requests. When this is 0, it is safe to purge callbacks
* array.
*
* @property _nPending
* @type Number
* @private
* @static
*/
_nPending : 0,
/**
* Global array of callback functions, one for each request sent.
*
* @property callbacks
* @type Function[]
* @static
*/
callbacks : []
});
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/**
* XHRDataSource class for accessing remote data via the YUI Connection Manager
* Utility
*
* @namespace YAHOO.util
* @class YAHOO.util.XHRDataSource
* @extends YAHOO.util.DataSourceBase
* @constructor
* @param oLiveData {HTMLElement} Pointer to live data.
* @param oConfigs {object} (optional) Object literal of configuration values.
*/
util.XHRDataSource = function(oLiveData, oConfigs) {
this.dataType = DS.TYPE_XHR;
this.connMgr = this.connMgr || util.Connect;
oLiveData = oLiveData || "";
util.XHRDataSource.superclass.constructor.call(this, oLiveData, oConfigs);
};
// XHRDataSource extends DataSourceBase
lang.extend(util.XHRDataSource, DS, {
/////////////////////////////////////////////////////////////////////////////
//
// XHRDataSource public properties
//
/////////////////////////////////////////////////////////////////////////////
/**
* Alias to YUI Connection Manager, to allow implementers to use a custom class.
*
* @property connMgr
* @type Object
* @default YAHOO.util.Connect
*/
connMgr: null,
/**
* Defines request/response management in the following manner:
* <dl>
* <dt>queueRequests</dt>
* <dd>If a request is already in progress, wait until response is returned
* before sending the next request.</dd>
*
* <dt>cancelStaleRequests</dt>
* <dd>If a request is already in progress, cancel it before sending the next
* request.</dd>
*
* <dt>ignoreStaleResponses</dt>
* <dd>Send all requests, but handle only the response for the most recently
* sent request.</dd>
*
* <dt>allowAll</dt>
* <dd>Send all requests and handle all responses.</dd>
*
* </dl>
*
* @property connXhrMode
* @type String
* @default "allowAll"
*/
connXhrMode: "allowAll",
/**
* True if data is to be sent via POST. By default, data will be sent via GET.
*
* @property connMethodPost
* @type Boolean
* @default false
*/
connMethodPost: false,
/**
* The connection timeout defines how many milliseconds the XHR connection will
* wait for a server response. Any non-zero value will enable the Connection Manager's
* Auto-Abort feature.
*
* @property connTimeout
* @type Number
* @default 0
*/
connTimeout: 0,
/////////////////////////////////////////////////////////////////////////////
//
// XHRDataSource public methods
//
/////////////////////////////////////////////////////////////////////////////
/**
* Overriding method passes query to Connection Manager. The returned
* response is then forwarded to the handleResponse function.
*
* @method makeConnection
* @param oRequest {Object} Request object.
* @param oCallback {Object} Callback object literal.
* @param oCaller {Object} (deprecated) Use oCallback.scope.
* @return {Number} Transaction ID.
*/
makeConnection : function(oRequest, oCallback, oCaller) {
var oRawResponse = null;
var tId = DS._nTransactionId++;
this.fireEvent("requestEvent", {tId:tId,request:oRequest,callback:oCallback,caller:oCaller});
// Set up the callback object and
// pass the request in as a URL query and
// forward the response to the handler
var oSelf = this;
var oConnMgr = this.connMgr;
var oQueue = this._oQueue;
/**
* Define Connection Manager success handler
*
* @method _xhrSuccess
* @param oResponse {Object} HTTPXMLRequest object
* @private
*/
var _xhrSuccess = function(oResponse) {
// If response ID does not match last made request ID,
// silently fail and wait for the next response
if(oResponse && (this.connXhrMode == "ignoreStaleResponses") &&
(oResponse.tId != oQueue.conn.tId)) {
YAHOO.log("Ignored stale response", "warn", this.toString());
return null;
}
// Error if no response
else if(!oResponse) {
this.fireEvent("dataErrorEvent", {request:oRequest,
callback:oCallback, caller:oCaller,
message:DS.ERROR_DATANULL});
YAHOO.log(DS.ERROR_DATANULL, "error", this.toString());
// Send error response back to the caller with the error flag on
DS.issueCallback(oCallback,[oRequest, {error:true}], true, oCaller);
return null;
}
// Forward to handler
else {
// Try to sniff data type if it has not been defined
if(this.responseType === DS.TYPE_UNKNOWN) {
var ctype = (oResponse.getResponseHeader) ? oResponse.getResponseHeader["Content-Type"] : null;
if(ctype) {
// xml
if(ctype.indexOf("text/xml") > -1) {
this.responseType = DS.TYPE_XML;
}
else if(ctype.indexOf("application/json") > -1) { // json
this.responseType = DS.TYPE_JSON;
}
else if(ctype.indexOf("text/plain") > -1) { // text
this.responseType = DS.TYPE_TEXT;
}
}
}
this.handleResponse(oRequest, oResponse, oCallback, oCaller, tId);
}
};
/**
* Define Connection Manager failure handler
*
* @method _xhrFailure
* @param oResponse {Object} HTTPXMLRequest object
* @private
*/
var _xhrFailure = function(oResponse) {
this.fireEvent("dataErrorEvent", {request:oRequest,
callback:oCallback, caller:oCaller,
message:DS.ERROR_DATAINVALID});
YAHOO.log(DS.ERROR_DATAINVALID + ": " +
oResponse.statusText, "error", this.toString());
// Backward compatibility
if(lang.isString(this.liveData) && lang.isString(oRequest) &&
(this.liveData.lastIndexOf("?") !== this.liveData.length-1) &&
(oRequest.indexOf("?") !== 0)){
YAHOO.log("DataSources using XHR no longer automatically supply " +
"a \"?\" between the host and query parameters" +
" -- please check that the request URL is correct", "warn", this.toString());
}
// Send failure response back to the caller with the error flag on
oResponse = oResponse || {};
oResponse.error = true;
DS.issueCallback(oCallback,[oRequest,oResponse],true, oCaller);
return null;
};
/**
* Define Connection Manager callback object
*
* @property _xhrCallback
* @param oResponse {Object} HTTPXMLRequest object
* @private
*/
var _xhrCallback = {
success:_xhrSuccess,
failure:_xhrFailure,
scope: this
};
// Apply Connection Manager timeout
if(lang.isNumber(this.connTimeout)) {
_xhrCallback.timeout = this.connTimeout;
}
// Cancel stale requests
if(this.connXhrMode == "cancelStaleRequests") {
// Look in queue for stale requests
if(oQueue.conn) {
if(oConnMgr.abort) {
oConnMgr.abort(oQueue.conn);
oQueue.conn = null;
YAHOO.log("Canceled stale request", "warn", this.toString());
}
else {
YAHOO.log("Could not find Connection Manager abort() function", "error", this.toString());
}
}
}
// Get ready to send the request URL
if(oConnMgr && oConnMgr.asyncRequest) {
var sLiveData = this.liveData;
var isPost = this.connMethodPost;
var sMethod = (isPost) ? "POST" : "GET";
// Validate request
var sUri = (isPost || !lang.isValue(oRequest)) ? sLiveData : sLiveData+oRequest;
var sRequest = (isPost) ? oRequest : null;
// Send the request right away
if(this.connXhrMode != "queueRequests") {
oQueue.conn = oConnMgr.asyncRequest(sMethod, sUri, _xhrCallback, sRequest);
}
// Queue up then send the request
else {
// Found a request already in progress
if(oQueue.conn) {
var allRequests = oQueue.requests;
// Add request to queue
allRequests.push({request:oRequest, callback:_xhrCallback});
// Interval needs to be started
if(!oQueue.interval) {
oQueue.interval = setInterval(function() {
// Connection is in progress
if(oConnMgr.isCallInProgress(oQueue.conn)) {
return;
}
else {
// Send next request
if(allRequests.length > 0) {
// Validate request
sUri = (isPost || !lang.isValue(allRequests[0].request)) ? sLiveData : sLiveData+allRequests[0].request;
sRequest = (isPost) ? allRequests[0].request : null;
oQueue.conn = oConnMgr.asyncRequest(sMethod, sUri, allRequests[0].callback, sRequest);
// Remove request from queue
allRequests.shift();
}
// No more requests
else {
clearInterval(oQueue.interval);
oQueue.interval = null;
}
}
}, 50);
}
}
// Nothing is in progress
else {
oQueue.conn = oConnMgr.asyncRequest(sMethod, sUri, _xhrCallback, sRequest);
}
}
}
else {
YAHOO.log("Could not find Connection Manager asyncRequest() function", "error", this.toString());
// Send null response back to the caller with the error flag on
DS.issueCallback(oCallback,[oRequest,{error:true}],true,oCaller);
}
return tId;
}
});
// Copy static members to XHRDataSource class
lang.augmentObject(util.XHRDataSource, DS);
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/**
* Factory class for creating a BaseDataSource subclass instance. The sublcass is
* determined by oLiveData's type, unless the dataType config is explicitly passed in.
*
* @namespace YAHOO.util
* @class YAHOO.util.DataSource
* @constructor
* @param oLiveData {HTMLElement} Pointer to live data.
* @param oConfigs {object} (optional) Object literal of configuration values.
*/
util.DataSource = function(oLiveData, oConfigs) {
oConfigs = oConfigs || {};
// Point to one of the subclasses, first by dataType if given, then by sniffing oLiveData type.
var dataType = oConfigs.dataType;
if(dataType) {
if(dataType == DS.TYPE_LOCAL) {
lang.augmentObject(util.DataSource, util.LocalDataSource);
return new util.LocalDataSource(oLiveData, oConfigs);
}
else if(dataType == DS.TYPE_XHR) {
lang.augmentObject(util.DataSource, util.XHRDataSource);
return new util.XHRDataSource(oLiveData, oConfigs);
}
else if(dataType == DS.TYPE_SCRIPTNODE) {
lang.augmentObject(util.DataSource, util.ScriptNodeDataSource);
return new util.ScriptNodeDataSource(oLiveData, oConfigs);
}
else if(dataType == DS.TYPE_JSFUNCTION) {
lang.augmentObject(util.DataSource, util.FunctionDataSource);
return new util.FunctionDataSource(oLiveData, oConfigs);
}
}
if(YAHOO.lang.isString(oLiveData)) { // strings default to xhr
lang.augmentObject(util.DataSource, util.XHRDataSource);
return new util.XHRDataSource(oLiveData, oConfigs);
}
else if(YAHOO.lang.isFunction(oLiveData)) {
lang.augmentObject(util.DataSource, util.FunctionDataSource);
return new util.FunctionDataSource(oLiveData, oConfigs);
}
else { // ultimate default is local
lang.augmentObject(util.DataSource, util.LocalDataSource);
return new util.LocalDataSource(oLiveData, oConfigs);
}
};
// Copy static members to DataSource class
lang.augmentObject(util.DataSource, DS);
})();