API: menu contextmenu.js (YUI Library)

# Yahoo! UI Library

### Menu 2.8.1

Yahoo! UI Library > menu > contextmenu.js (source view)
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    (function () {

    	var _XY = "xy",
    		_MOUSEDOWN = "mousedown",
    		_CONTEXTMENU = "ContextMenu",
    		_SPACE = " ";

    /**
    * Creates a list of options or commands which are made visible in response to
    * an HTML element's "contextmenu" event ("mousedown" for Opera).
    *
    * @param {String} p_oElement String specifying the id attribute of the
    * <code>&#60;div&#62;</code> element of the context menu.
    * @param {String} p_oElement String specifying the id attribute of the
    * <code>&#60;select&#62;</code> element to be used as the data source for the
    * context menu.
    * @param {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-one-
    * html.html#ID-22445964">HTMLDivElement</a>} p_oElement Object specifying the
    * <code>&#60;div&#62;</code> element of the context menu.
    * @param {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-one-
    * html.html#ID-94282980">HTMLSelectElement</a>} p_oElement Object specifying
    * the <code>&#60;select&#62;</code> element to be used as the data source for
    * the context menu.
    * @param {Object} p_oConfig Optional. Object literal specifying the
    * configuration for the context menu. See configuration class documentation
    * for more details.
    * @class ContextMenu
    * @constructor
    * @extends YAHOO.widget.Menu
    * @namespace YAHOO.widget
    */
    YAHOO.widget.ContextMenu = function(p_oElement, p_oConfig) {

        YAHOO.widget.ContextMenu.superclass.constructor.call(this, p_oElement, p_oConfig);

    };

    var Event = YAHOO.util.Event,
    	UA = YAHOO.env.ua,
        ContextMenu = YAHOO.widget.ContextMenu,

        /**
        * Constant representing the name of the ContextMenu's events
        * @property EVENT_TYPES
        * @private
        * @final
        * @type Object
        */
        EVENT_TYPES = {

            "TRIGGER_CONTEXT_MENU": "triggerContextMenu",
            "CONTEXT_MENU": (UA.opera ? _MOUSEDOWN : "contextmenu"),
            "CLICK": "click"

        },

        /**
        * Constant representing the ContextMenu's configuration properties
        * @property DEFAULT_CONFIG
        * @private
        * @final
        * @type Object
        */
        TRIGGER_CONFIG = {
    		key: "trigger",
    		suppressEvent: true
        };

    /**
    * @method position
    * @description "beforeShow" event handler used to position the contextmenu.
    * @private
    * @param {String} p_sType String representing the name of the event that
    * was fired.
    * @param {Array} p_aArgs Array of arguments sent when the event was fired.
    * @param {Array} p_aPos Array representing the xy position for the context menu.
    */
    function position(p_sType, p_aArgs, p_aPos) {

        this.cfg.setProperty(_XY, p_aPos);

        this.beforeShowEvent.unsubscribe(position, p_aPos);

    }

    YAHOO.lang.extend(ContextMenu, YAHOO.widget.Menu, {

    // Private properties

    /**
    * @property _oTrigger
    * @description Object reference to the current value of the "trigger"
    * configuration property.
    * @default null
    * @private
    * @type String|<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/leve
    * l-one-html.html#ID-58190037">HTMLElement</a>|Array
    */
    _oTrigger: null,

    /**
    * @property _bCancelled
    * @description Boolean indicating if the display of the context menu should
    * be cancelled.
    * @default false
    * @private
    * @type Boolean
    */
    _bCancelled: false,

    // Public properties

    /**
    * @property contextEventTarget
    * @description Object reference for the HTML element that was the target of the
    * "contextmenu" DOM event ("mousedown" for Opera) that triggered the display of
    * the context menu.
    * @default null
    * @type <a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-one-
    * html.html#ID-58190037">HTMLElement</a>
    */
    contextEventTarget: null,

    // Events

    /**
    * @event triggerContextMenuEvent
    * @description Custom Event wrapper for the "contextmenu" DOM event
    * ("mousedown" for Opera) fired by the element(s) that trigger the display of
    * the context menu.
    */
    triggerContextMenuEvent: null,

    /**
    * @method init
    * @description The ContextMenu class's initialization method. This method is
    * automatically called by the constructor, and sets up all DOM references for
    * pre-existing markup, and creates required markup if it is not already present.
    * @param {String} p_oElement String specifying the id attribute of the
    * <code>&#60;div&#62;</code> element of the context menu.
    * @param {String} p_oElement String specifying the id attribute of the
    * <code>&#60;select&#62;</code> element to be used as the data source for
    * the context menu.
    * @param {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-one-
    * html.html#ID-22445964">HTMLDivElement</a>} p_oElement Object specifying the
    * <code>&#60;div&#62;</code> element of the context menu.
    * @param {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-one-
    * html.html#ID-94282980">HTMLSelectElement</a>} p_oElement Object specifying
    * the <code>&#60;select&#62;</code> element to be used as the data source for
    * the context menu.
    * @param {Object} p_oConfig Optional. Object literal specifying the
    * configuration for the context menu. See configuration class documentation
    * for more details.
    */
    init: function(p_oElement, p_oConfig) {

        // Call the init of the superclass (YAHOO.widget.Menu)

        ContextMenu.superclass.init.call(this, p_oElement);

        this.beforeInitEvent.fire(ContextMenu);

        if (p_oConfig) {

            this.cfg.applyConfig(p_oConfig, true);

        }

        this.initEvent.fire(ContextMenu);

    },

    /**
    * @method initEvents
    * @description Initializes the custom events for the context menu.
    */
    initEvents: function() {

    	ContextMenu.superclass.initEvents.call(this);

        // Create custom events

        this.triggerContextMenuEvent = this.createEvent(EVENT_TYPES.TRIGGER_CONTEXT_MENU);

        this.triggerContextMenuEvent.signature = YAHOO.util.CustomEvent.LIST;

    },

    /**
    * @method cancel
    * @description Cancels the display of the context menu.
    */
    cancel: function() {

        this._bCancelled = true;

    },

    // Private methods

    /**
    * @method _removeEventHandlers
    * @description Removes all of the DOM event handlers from the HTML element(s)
    * whose "context menu" event ("click" for Opera) trigger the display of
    * the context menu.
    * @private
    */
    _removeEventHandlers: function() {

        var oTrigger = this._oTrigger;

        // Remove the event handlers from the trigger(s)

        if (oTrigger) {

            Event.removeListener(oTrigger, EVENT_TYPES.CONTEXT_MENU, this._onTriggerContextMenu);

            if (UA.opera) {

                Event.removeListener(oTrigger, EVENT_TYPES.CLICK, this._onTriggerClick);

            }

        }

    },

    // Private event handlers

    /**
    * @method _onTriggerClick
    * @description "click" event handler for the HTML element(s) identified as the
    * "trigger" for the context menu.  Used to cancel default behaviors in Opera.
    * @private
    * @param {Event} p_oEvent Object representing the DOM event object passed back
    * by the event utility (YAHOO.util.Event).
    * @param {YAHOO.widget.ContextMenu} p_oMenu Object representing the context
    * menu that is handling the event.
    */
    _onTriggerClick: function(p_oEvent, p_oMenu) {

        if (p_oEvent.ctrlKey) {

            Event.stopEvent(p_oEvent);

        }

    },

    /**
    * @method _onTriggerContextMenu
    * @description "contextmenu" event handler ("mousedown" for Opera) for the HTML
    * element(s) that trigger the display of the context menu.
    * @private
    * @param {Event} p_oEvent Object representing the DOM event object passed back
    * by the event utility (YAHOO.util.Event).
    * @param {YAHOO.widget.ContextMenu} p_oMenu Object representing the context
    * menu that is handling the event.
    */
    _onTriggerContextMenu: function(p_oEvent, p_oMenu) {

        var aXY;

        if (!(p_oEvent.type == _MOUSEDOWN && !p_oEvent.ctrlKey)) {

    		this.contextEventTarget = Event.getTarget(p_oEvent);

    		this.triggerContextMenuEvent.fire(p_oEvent);

    		if (!this._bCancelled) {

    			/*
    				Prevent the browser's default context menu from appearing and
    				stop the propagation of the "contextmenu" event so that
    				other ContextMenu instances are not displayed.
    			*/

    			Event.stopEvent(p_oEvent);

    			// Hide any other Menu instances that might be visible

    			YAHOO.widget.MenuManager.hideVisible();

    			// Position and display the context menu

    			aXY = Event.getXY(p_oEvent);

    			if (!YAHOO.util.Dom.inDocument(this.element)) {

    				this.beforeShowEvent.subscribe(position, aXY);

    			}
    			else {

    				this.cfg.setProperty(_XY, aXY);

    			}

    			this.show();

    		}

    		this._bCancelled = false;

        }

    },

    // Public methods

    /**
    * @method toString
    * @description Returns a string representing the context menu.
    * @return {String}
    */
    toString: function() {

        var sReturnVal = _CONTEXTMENU,
            sId = this.id;

        if (sId) {

            sReturnVal += (_SPACE + sId);

        }

        return sReturnVal;

    },

    /**
    * @method initDefaultConfig
    * @description Initializes the class's configurable properties which can be
    * changed using the context menu's Config object ("cfg").
    */
    initDefaultConfig: function() {

        ContextMenu.superclass.initDefaultConfig.call(this);

        /**
        * @config trigger
        * @description The HTML element(s) whose "contextmenu" event ("mousedown"
        * for Opera) trigger the display of the context menu.  Can be a string
        * representing the id attribute of the HTML element, an object reference
        * for the HTML element, or an array of strings or HTML element references.
        * @default null
        * @type String|<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
        * level-one-html.html#ID-58190037">HTMLElement</a>|Array
        */
        this.cfg.addProperty(TRIGGER_CONFIG.key,
            {
                handler: this.configTrigger,
                suppressEvent: TRIGGER_CONFIG.suppressEvent
            }
        );

    },

    /**
    * @method destroy
    * @description Removes the context menu's <code>&#60;div&#62;</code> element
    * (and accompanying child nodes) from the document.
    */
    destroy: function() {

        // Remove the DOM event handlers from the current trigger(s)

        this._removeEventHandlers();

        // Continue with the superclass implementation of this method

        ContextMenu.superclass.destroy.call(this);

    },

    // Public event handlers for configuration properties

    /**
    * @method configTrigger
    * @description Event handler for when the value of the "trigger" configuration
    * property changes.
    * @param {String} p_sType String representing the name of the event that
    * was fired.
    * @param {Array} p_aArgs Array of arguments sent when the event was fired.
    * @param {YAHOO.widget.ContextMenu} p_oMenu Object representing the context
    * menu that fired the event.
    */
    configTrigger: function(p_sType, p_aArgs, p_oMenu) {

        var oTrigger = p_aArgs[0];

        if (oTrigger) {

            /*
                If there is a current "trigger" - remove the event handlers
                from that element(s) before assigning new ones
            */

            if (this._oTrigger) {

                this._removeEventHandlers();

            }

            this._oTrigger = oTrigger;

            /*
                Listen for the "mousedown" event in Opera b/c it does not
                support the "contextmenu" event
            */

            Event.on(oTrigger, EVENT_TYPES.CONTEXT_MENU, this._onTriggerContextMenu, this, true);

            /*
                Assign a "click" event handler to the trigger element(s) for
                Opera to prevent default browser behaviors.
            */

            if (UA.opera) {

                Event.on(oTrigger, EVENT_TYPES.CLICK, this._onTriggerClick, this, true);

            }

        }
        else {

            this._removeEventHandlers();

        }

    }

    }); // END YAHOO.lang.extend

    }());

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