YUI Library Examples: Rich Text Editor (beta): Calendar Plugin

Setting up the Editor's HTML

Setting up the Editor's HTML is done by creating a textarea control on the page.

Setting up the Editor's Javascript

Once the textarea is on the page, then initialize the Editor like this:

Creating the Toolbar Button and Menu

Now we can create a button and add it to the Editor's Toolbar. First we subscribe to the Editor's toolbarLoaded Custom Event. From inside that function we will set up a new button config object literal with the following properties:

type: (push, menu, split, spin, select, color)
label: The text string displayed on the button
value: The value is also called the Command for the button.
menu: A YAHOO.widget.Overlay instance to be used as a menu.

Now add it to the Toolbar group called "insertitem" like this: myEditor.toolbar.addButtonToGroup(dateConfig, 'insertitem');

//Snipped from above
    var myEditor = new YAHOO.widget.Editor('editor', myConfig);

//Subscribe to the toolbarLoaded Custom event fired in render
    myEditor.on('toolbarLoaded', function() { 
       
        //Setup the config for the new "Insert Date" button
        var dateConfig = {
            type: 'push', //Using a standard push button
            label: 'Insert Date', //The name/title of the button
            value: 'insertdate', //The "Command" for the button
            menu: function() {
                //Create the Overlay instance we are going to use for the menu
                var menu = new YAHOO.widget.Overlay('insertdate', {
                    width: '210px',
                    height: '220px',
                    xy: [-9000,-9000],
                    visible: false
                });
                //Setting the body to the container that we wish to render the calendar into.
                menu.setBody('<div id="cal1Container"></div>');
                //Set the context to the bottom left corner of the Insert Date button
                menu.beforeShowEvent.subscribe(function() {
                    menu.cfg.setProperty('context', [
                        myEditor.toolbar.getButtonByValue('insertdate').get('element'),
                        'tl',
                        'bl'
                    ]);
                });
                //Show the Overlay and prep the calendar's selected date
                menu.showEvent.subscribe(function() {
                    cal.deselectAll();
                    Dom.removeClass(cal.cells, 'selected');
                    //selectedDate is populated in the onAvailable call later on..
                    if (selectedDate != null) {
                        cal.cfg.setProperty('selected', selectedDate);
                        cal.cfg.setProperty('pagedate', new Date(selectedDate), true);
                        selectedDate = null;
                    }
                    cal.render();
                });
                menu.render(document.body);
                menu.element.style.visibility = 'hidden';                
                //return the Overlay instance here
                return menu;
            }() //This fires the function right now to return the Overlay Instance to the menu property..
        };
        //Add the new button to the Toolbar Group called insertitem.
        myEditor.toolbar.addButtonToGroup(dateConfig, 'insertitem');
    });
    myEditor.render();
})();

Handling the Button's State on Node Change

After we have created the new button and added it to the Toolbar, we need to listen for events to trigger our new button.

We can do that by listening to the afterNodeChange CustomEvent.

The before/afterNodeChange events are fired when something interesting happens inside the Editor. Clicks, Key Presses, etc.

From inside the afterNodeChange Event we can get access the the last element (or current element) that was affected. We get access to this element via: obj._getSelectedElement()

Now that we have a reference we can use standard DOM manipulation to change the element and the Toolbar.

In this case, we are grabbing the current element and checking to see if it or its parent has a className of date.

If it does, then we are populating the var selectedDate with the innerHTML of the element.

We are also using this opportunity to select the "insertdate" button on the toolbar, so that it becomes active. We are doing this with the following command:this.toolbar.selectButton(this.toolbar.getButtonByValue('insertdate'))

this.toolbar.getButtonByValue('insertdate') this method will return a Button reference from the toolbar, that we can pass to this.toolbar.selectButton() and cause the button to be selected.

On the next nodeChange Event, our button will be disabled automatically and this handler will re-select it if it is needed.

//Snipped from above
    myEditor.toolbar.addButtonToGroup(dateConfig, 'insertitem');

//Listening to the afterNode Change Custom Event
    myEditor.on('afterNodeChange', function() {
        var el = this._getSelectedElement(); //Currently Selected Element
        //Does it or its parent have a class of 'date'
        if (Dom.hasClass(el, 'date') || Dom.hasClass(el.parentNode, 'date')) {
            //Set the button to selected
            this.toolbar.selectButton(this.toolbar.getButtonByValue('insertdate'));
            //Capture the innerHTML of the element and use it in the Menu's show Event.
            if (Dom.hasClass(el.parentNode, 'date')) {
                selectedDate = el.parentNode.innerHTML;
            } else {
                selectedDate = el.innerHTML;
            }
            var _button = this.toolbar.getButtonByValue('insertdate');
            _button._menu.hide();
        }
    }, myEditor, true);

myEditor.toolbar.on('insertdateClick', function(ev) {
        var calDate = ' <span class="date">' + (ev.calDate.getMonth() + 1)
            + '/' + ev.calDate.getDate()
            + '/' + ev.calDate.getFullYear() + '</span> ';
        this._focusWindow();
        this.execCommand('inserthtml', calDate);
        this._focusWindow();
        var _button = this.toolbar.getButtonByValue('insertdate');
        _button._menu.hide();
    }, myEditor, true);
    
});

Rendering the Calendar and Handle Date Selection

Now we add this code at the bottom to be activated when the Element cal1Container becomes available in the DOM.

Once that Element is active on the page, we can now build and render our Calendar control.

Notice, that we are subscribing to the Calendar's selectEvent to actually execute the insertdateClick event for the Editor.

From there, we get a button reference and call the menu's hide method to hide the Calendar.

Styling the Button

There are 2 important states to style a button in the toolbar.

First is the default state, that can be accessed via this CSS rule: .yui-skin-sam .yui-toolbar-container .yui-toolbar-insertdate span.yui-toolbar-icon

Second is the selected state, that can be accessed via this CSS rule: .yui-skin-sam .yui-toolbar-container .yui-button-insertdate-selected span.yui-toolbar-icon

.yui-toolbar-container is the class applied to the top-most container of the toolbar.

.yui-toolbar-icon is an extra SPAN injected into the button for spriting an image.

.yui-toolbar-VALUE is a dynamic class added to the button based on the value passed into the buttons config. It is used for specific styling of a button that may appear in several places on the page.

The Style Rules to Create the Calendar Button in this Example

Full Example Javascript Source

(function() {
    var Dom = YAHOO.util.Dom,
        Event = YAHOO.util.Event,
        cal = null,
        selectedDate = null;

var myConfig = {
            height: '300px',
            width: '522px',
            animate: true,
            dompath: true
        };

var myEditor = new YAHOO.widget.Editor('editor', myConfig);

myEditor.on('toolbarLoaded', function() { 
       
        var dateConfig = {
            type: 'push', label: 'Insert Date', value: 'insertdate',
            menu: function() {
                var menu = new YAHOO.widget.Overlay('insertdate', {
                    width: '210px',
                    height: '220px',
                    xy: [-9000,-9000],
                    visible: false
                });
                menu.setBody('<div id="cal1Container"></div>');
                menu.beforeShowEvent.subscribe(function() {
                    menu.cfg.setProperty('context', [
                        myEditor.toolbar.getButtonByValue('insertdate').get('element'),
                        'tl', 'bl'
                    ]);
                });
                menu.showEvent.subscribe(function() {
                    cal.deselectAll();
                    Dom.removeClass(cal.cells, 'selected');
                    if (selectedDate != null) {
                        cal.cfg.setProperty('selected', selectedDate);
                        cal.cfg.setProperty('pagedate', new Date(selectedDate), true);
                        selectedDate = null;
                    }
                    cal.render();
                });
                menu.render(document.body);
                menu.element.style.visibility = 'hidden';                
                return menu;
            }()
        };
        myEditor.toolbar.addButtonToGroup(dateConfig, 'insertitem');

myEditor.on('afterNodeChange', function() {
            var el = this._getSelectedElement();
            if (Dom.hasClass(el, 'date') || Dom.hasClass(el.parentNode, 'date')) {
                this.toolbar.selectButton(this.toolbar.getButtonByValue('insertdate'));
                if (Dom.hasClass(el.parentNode, 'date')) {
                    selectedDate = el.parentNode.innerHTML;
                } else {
                    selectedDate = el.innerHTML;
                }
            }
            var _button = this.toolbar.getButtonByValue('insertdate');
            _button._menu.hide();
        }, myEditor, true);

myEditor.toolbar.on('insertdateClick', function(ev) {
            var calDate = '<span class="date">' + (ev.calDate.getMonth() + 1)
                + '/' + ev.calDate.getDate()
                + '/' + ev.calDate.getFullYear() + '</span>';
            this._focusWindow();
            this.execCommand('inserthtml', calDate);
            this._focusWindow();
            var _button = this.toolbar.getButtonByValue('insertdate');
            _button._menu.hide();
        }, myEditor, true);
    });
    myEditor.render();

Event.onAvailable('cal1Container', function() {
        cal = new YAHOO.widget.Calendar('cal1', 'cal1Container');
        cal.selectEvent.subscribe(function() {
            var calDate = cal.getSelectedDates()[0];
            this.toolbar.fireEvent('insertdateClick', { type: 'insertdateClick', calDate: calDate });
        }, myEditor, true);
        cal.render();
    });

})();

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