button.js

很棒的在线教学系统

        
                initConfig.call(this, oConfig);
        
        
                if (!oConfig.element) {
    
            
                    oConfig.element = this.createButtonElement(oConfig.attributes.type);
            
                }
            
                fnSuperClass.call(this, oConfig.element, oConfig.attributes);
            
            }
    
        }
    
    };



    YAHOO.extend(YAHOO.widget.Button, YAHOO.util.Element, {
    
    
        // Protected properties
        
        
        /** 
        * @property _button
        * @description Object reference to the button's internal 
        * <code>&#60;a&#62;</code> or <code>&#60;button&#62;</code> element.
        * @default null
        * @protected
        * @type <a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
        * level-one-html.html#ID-48250443">HTMLAnchorElement</a>|<a href="
        * http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-one-html.html
        * #ID-34812697">HTMLButtonElement</a>
        */
        _button: null,
        
        
        /** 
        * @property _menu
        * @description Object reference to the button's menu.
        * @default null
        * @protected
        * @type {<a href="YAHOO.widget.Overlay.html">YAHOO.widget.Overlay</a>|
        * <a href="YAHOO.widget.Menu.html">YAHOO.widget.Menu</a>}
        */
        _menu: null,
        
        
        /** 
        * @property _hiddenFields
        * @description Object reference to the <code>&#60;input&#62;</code>  
        * element, or array of HTML form elements used to represent the button
        *  when its parent form is submitted.
        * @default null
        * @protected
        * @type <a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
        * level-one-html.html#ID-6043025">HTMLInputElement</a>|Array
        */
        _hiddenFields: null,
        
        
        /** 
        * @property _onclickAttributeValue
        * @description Object reference to the button's current value for the 
        * "onclick" configuration attribute.
        * @default null
        * @protected
        * @type Object
        */
        _onclickAttributeValue: null,
        
        
        /** 
        * @property _activationKeyPressed
        * @description Boolean indicating if the key(s) that toggle the button's 
        * "active" state have been pressed.
        * @default false
        * @protected
        * @type Boolean
        */
        _activationKeyPressed: false,
        
        
        /** 
        * @property _activationButtonPressed
        * @description Boolean indicating if the mouse button that toggles 
        * the button's "active" state has been pressed.
        * @default false
        * @protected
        * @type Boolean
        */
        _activationButtonPressed: false,
        
        
        /** 
        * @property _hasKeyEventHandlers
        * @description Boolean indicating if the button's "blur", "keydown" and 
        * "keyup" event handlers are assigned
        * @default false
        * @protected
        * @type Boolean
        */
        _hasKeyEventHandlers: false,
        
        
        /** 
        * @property _hasMouseEventHandlers
        * @description Boolean indicating if the button's "mouseout," 
        * "mousedown," and "mouseup" event handlers are assigned
        * @default false
        * @protected
        * @type Boolean
        */
        _hasMouseEventHandlers: false,


        /** 
        * @property _nOptionRegionX
        * @description Number representing the X coordinate of the leftmost edge of the Button's 
        * option region.  Applies only to Buttons of type "split".
        * @default 0
        * @protected
        * @type Number
        */        
        _nOptionRegionX: 0,
        


        // Constants
        
        
        /**
        * @property NODE_NAME
        * @description The name of the node to be used for the button's 
        * root element.
        * @default "SPAN"
        * @final
        * @type String
        */
        NODE_NAME: "SPAN",
        
        
        /**
        * @property CHECK_ACTIVATION_KEYS
        * @description Array of numbers representing keys that (when pressed) 
        * toggle the button's "checked" attribute.
        * @default [32]
        * @final
        * @type Array
        */
        CHECK_ACTIVATION_KEYS: [32],
        
        
        /**
        * @property ACTIVATION_KEYS
        * @description Array of numbers representing keys that (when presed) 
        * toggle the button's "active" state.
        * @default [13, 32]
        * @final
        * @type Array
        */
        ACTIVATION_KEYS: [13, 32],
        
        
        /**
        * @property OPTION_AREA_WIDTH
        * @description Width (in pixels) of the area of a split button that  
        * when pressed will display a menu.
        * @default 20
        * @final
        * @type Number
        */
        OPTION_AREA_WIDTH: 20,
        
        
        /**
        * @property CSS_CLASS_NAME
        * @description String representing the CSS class(es) to be applied to  
        * the button's root element.
        * @default "yui-button"
        * @final
        * @type String
        */
        CSS_CLASS_NAME: "yui-button",
        
        
        /**
        * @property RADIO_DEFAULT_TITLE
        * @description String representing the default title applied to buttons 
        * of type "radio." 
        * @default "Unchecked.  Click to check."
        * @final
        * @type String
        */
        RADIO_DEFAULT_TITLE: "Unchecked.  Click to check.",
        
        
        /**
        * @property RADIO_CHECKED_TITLE
        * @description String representing the title applied to buttons of 
        * type "radio" when checked.
        * @default "Checked.  Click another button to uncheck"
        * @final
        * @type String
        */
        RADIO_CHECKED_TITLE: "Checked.  Click another button to uncheck",
        
        
        /**
        * @property CHECKBOX_DEFAULT_TITLE
        * @description String representing the default title applied to 
        * buttons of type "checkbox." 
        * @default "Unchecked.  Click to check."
        * @final
        * @type String
        */
        CHECKBOX_DEFAULT_TITLE: "Unchecked.  Click to check.",
        
        
        /**
        * @property CHECKBOX_CHECKED_TITLE
        * @description String representing the title applied to buttons of type 
        * "checkbox" when checked.
        * @default "Checked.  Click to uncheck."
        * @final
        * @type String
        */
        CHECKBOX_CHECKED_TITLE: "Checked.  Click to uncheck.",
        
        
        /**
        * @property MENUBUTTON_DEFAULT_TITLE
        * @description String representing the default title applied to 
        * buttons of type "menu." 
        * @default "Menu collapsed.  Click to expand."
        * @final
        * @type String
        */
        MENUBUTTON_DEFAULT_TITLE: "Menu collapsed.  Click to expand.",
        
        
        /**
        * @property MENUBUTTON_MENU_VISIBLE_TITLE
        * @description String representing the title applied to buttons of type 
        * "menu" when the button's menu is visible. 
        * @default "Menu expanded.  Click or press Esc to collapse."
        * @final
        * @type String
        */
        MENUBUTTON_MENU_VISIBLE_TITLE: 
            "Menu expanded.  Click or press Esc to collapse.",
        
        
        /**
        * @property SPLITBUTTON_DEFAULT_TITLE
        * @description  String representing the default title applied to 
        * buttons of type "split." 
        * @default "Menu collapsed.  Click inside option region or press 
        * Ctrl + Shift + M to show the menu."
        * @final
        * @type String
        */
        SPLITBUTTON_DEFAULT_TITLE: ("Menu collapsed.  Click inside option " + 
            "region or press down arrow key to show the menu."),
        
        
        /**
        * @property SPLITBUTTON_OPTION_VISIBLE_TITLE
        * @description String representing the title applied to buttons of type 
        * "split" when the button's menu is visible. 
        * @default "Menu expanded.  Press Esc or Ctrl + Shift + M to hide 
        * the menu."
        * @final
        * @type String
        */
        SPLITBUTTON_OPTION_VISIBLE_TITLE: 
            "Menu expanded.  Press Esc to hide the menu.",
        
        
        /**
        * @property SUBMIT_TITLE
        * @description String representing the title applied to buttons of 
        * type "submit." 
        * @default "Click to submit form."
        * @final
        * @type String
        */
        SUBMIT_TITLE: "Click to submit form.",
        
        
        
        // Protected attribute setter methods
        
        
        /**
        * @method _setType
        * @description Sets the value of the button's "type" attribute.
        * @protected
        * @param {String} p_sType String indicating the value for the button's 
        * "type" attribute.
        */
        _setType: function (p_sType) {
        
            if (p_sType == "split") {
        
                this.on("option", this._onOption);
        
            }
        
        },
        
        
        /**
        * @method _setLabel
        * @description Sets the value of the button's "label" attribute.
        * @protected
        * @param {String} p_sLabel String indicating the value for the button's 
        * "label" attribute.
        */
        _setLabel: function (p_sLabel) {

            this._button.innerHTML = p_sLabel;

            
            /*
                Remove and add the default class name from the root element
                for Gecko to ensure that the button shrinkwraps to the label.
                Without this the button will not be rendered at the correct 
                width when the label changes.  The most likely cause for this 
                bug is button's use of the Gecko-specific CSS display type of 
                "-moz-inline-box" to simulate "inline-block" supported by IE, 
                Safari and Opera.
            */
            
            var sClass,
                nGeckoVersion = UA.gecko;
				
            
            if (nGeckoVersion && nGeckoVersion < 1.9 && Dom.inDocument(this.get("element"))) {
            
                sClass = this.CSS_CLASS_NAME;                

                this.removeClass(sClass);
                
                Lang.later(0, this, this.addClass, sClass);

            }
        
        },
        
        
        /**
        * @method _setTabIndex
        * @description Sets the value of the button's "tabindex" attribute.
        * @protected
        * @param {Number} p_nTabIndex Number indicating the value for the 
        * button's "tabindex" attribute.
        */
        _setTabIndex: function (p_nTabIndex) {
        
            this._button.tabIndex = p_nTabIndex;
        
        },
        
        
        /**
        * @method _setTitle
        * @description Sets the value of the button's "title" attribute.
        * @protected
        * @param {String} p_nTabIndex Number indicating the value for 
        * the button's "title" attribute.
        */
        _setTitle: function (p_sTitle) {
        
            var sTitle = p_sTitle;
        
            if (this.get("type") != "link") {
        
                if (!sTitle) {
        
                    switch (this.get("type")) {
        
                    case "radio":
    
                        sTitle = this.RADIO_DEFAULT_TITLE;
    
                        break;
    
                    case "checkbox":
    
                        sTitle = this.CHECKBOX_DEFAULT_TITLE;
    
                        break;
                    
                    case "menu":
    
                        sTitle = this.MENUBUTTON_DEFAULT_TITLE;
    
                        break;
    
                    case "split":
    
                        sTitle = this.SPLITBUTTON_DEFAULT_TITLE;
    
                        break;
    
                    case "submit":
    
                        sTitle = this.SUBMIT_TITLE;
    
                        break;
        
                    }
        
                }
        
                this._button.title = sTitle;
        
            }
        
        },
        
        
        /**
        * @method _setDisabled
        * @description Sets the value of the button's "disabled" attribute.
        * @protected
        * @param {Boolean} p_bDisabled Boolean indicating the value for 
        * the button's "disabled" attribute.
        */
        _setDisabled: function (p_bDisabled) {
        
            if (this.get("type") != "link") {
        
                if (p_bDisabled) {
        
                    if (this._menu) {
        
                        this._menu.hide();
        
                    }
        
                    if (this.hasFocus()) {
                    
                        this.blur();
                    
                    }
        
                    this._button.setAttribute("disabled", "disabled");
        
                    this.addStateCSSClasses("disabled");

                    this.removeStateCSSClasses("hover");
                    this.removeStateCSSClasses("active");
                    this.removeStateCSSClasses("focus");
        
                }
                else {
        
                    this._button.removeAttribute("disabled");
        
                    this.removeStateCSSClasses("disabled");
                
                }
        
            }
        
        },

        
        /**
        * @method _setHref
        * @description Sets the value of the button's "href" attribute.
        * @protected
        * @param {String} p_sHref String indicating the value for the button's 
        * "href" attribute.
        */
        _setHref: function (p_sHref) {
        
            if (this.get("type") == "link") {
        
                this._button.href = p_sHref;
            
            }