element.style.js

Ext JS是一个创建丰富互联网应用程序的跨浏览器的JavaScrip库。它包含：高效率

/*
 * Ext JS Library 3.0 Pre-alpha
 * Copyright(c) 2006-2008, Ext JS, LLC.
 * [e-mail]
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.Element
 */
Ext.Element.addMethods(function(){  
    // local style camelizing for speed
    var propCache = {},
        camelRe = /(-[a-z])/gi,
        classReCache = {},
        view = document.defaultView,
        EL = Ext.Element,   
        PADDING = "padding",
        MARGIN = "margin",
        BORDER = "border",
        LEFT = "-left",
        RIGHT = "-right",
        TOP = "-top",
        BOTTOM = "-bottom",
        WIDTH = "-width",       
        // special markup used throughout Ext when box wrapping elements    
        borders = {l: BORDER + LEFT + WIDTH, r: BORDER + RIGHT + WIDTH, t: BORDER + TOP + WIDTH, b: BORDER + BOTTOM + WIDTH},
        paddings = {l: PADDING + LEFT, r: PADDING + RIGHT, t: PADDING + TOP, b: PADDING + BOTTOM},
        margins = {l: MARGIN + LEFT, r: MARGIN + RIGHT, t: MARGIN + TOP, b: MARGIN + BOTTOM};
        
    
    // private  
    function camelFn(m, a) {
        return a.charAt(1).toUpperCase();
    }
    
    // private (needs to be called => addStyles.call(this, sides, styles))
    function addStyles(sides, styles){
        var val = 0;    
        
        Ext.each(sides.match(/\w/g), function(s) {
            if (s = parseInt(this.getStyle(styles[s]), 10)) {
                val += Math.abs(s);      
            }
        },
        this);
        return val;
    }

    function chkCache(prop) {
        return propCache[prop] || (propCache[prop] = prop.replace(camelRe, camelFn))
    }
        
            
            
    return {    
        // private  ==> used by Fx  
        adjustWidth : function(width) {
            var me = this;      
            if(typeof width == "number" && me.autoBoxAdjust && !me.isBorderBox()){
               width -= (me.getBorderWidth("lr") + me.getPadding("lr"));
               width = width < 0 ? 0 : width;
            }
            return width;
        },
        
        // private   ==> used by Fx 
        adjustHeight : function(height) {
            var me = this;      
            if(typeof height == "number" && me.autoBoxAdjust && !me.isBorderBox()){
               height -= (me.getBorderWidth("tb") + me.getPadding("tb"));
               height = height < 0 ? 0 : height;
            }
            return height;
        },
    
    
        /**
         * Adds one or more CSS classes to the element. Duplicate classes are automatically filtered out.
         * @param {String/Array} className The CSS class to add, or an array of classes
         * @return {Ext.Element} this
         */
        addClass : function(className){
            var me = this;
            Ext.each(className, function(v) {
                me.dom.className += (!me.hasClass(v) && v ? " " + v : "");  
            });
            return me;
        },
    
        /**
         * Adds one or more CSS classes to this element and removes the same class(es) from all siblings.
         * @param {String/Array} className The CSS class to add, or an array of classes
         * @return {Ext.Element} this
         */
        radioClass : function(className){
            Ext.each(this.dom.parentNode.childNodes, function(v) {
                if(v.nodeType == 1) {
                    Ext.get(v).removeClass(className);          
                }
            });
            return this.addClass(className);
        },
    
        /**
         * Removes one or more CSS classes from the element.
         * @param {String/Array} className The CSS class to remove, or an array of classes
         * @return {Ext.Element} this
         */
        removeClass : function(className){
            var me = this;
            if (me.dom.className) {
                Ext.each(className, function(v) {               
                    me.dom.className = me.dom.className.replace(
                        classReCache[v] = classReCache[v] || new RegExp('(?:^|\\s+)' + v + '(?:\\s+|$)', "g"), 
                        " ");               
                });    
            }
            return me;
        },
    
        /**
         * Toggles the specified CSS class on this element (removes it if it already exists, otherwise adds it).
         * @param {String} className The CSS class to toggle
         * @return {Ext.Element} this
         */
        toggleClass : function(className){
            return this.hasClass(className) ? this.removeClass(className) : this.addClass(className);
        },
    
        /**
         * Checks if the specified CSS class exists on this element's DOM node.
         * @param {String} className The CSS class to check for
         * @return {Boolean} True if the class exists, else false
         */
        hasClass : function(className){
            return className && (' '+this.dom.className+' ').indexOf(' '+className+' ') != -1;
        },
    
        /**
         * Replaces a CSS class on the element with another.  If the old name does not exist, the new name will simply be added.
         * @param {String} oldClassName The CSS class to replace
         * @param {String} newClassName The replacement CSS class
         * @return {Ext.Element} this
         */
        replaceClass : function(oldClassName, newClassName){
            return this.removeClass(oldClassName).addClass(newClassName);
        },
        
        isStyle : function(style, val) {
//          var ret = false;
//          style = this.getStyle(style);
//          Ext.each(Ext.toArray(arguments,1),function(s){
//              if(style == s) return false; // stop iterating.
//          });
//          return ret;
            return this.getStyle(style) == val;  
        },
    
        /**
         * Normalizes currentStyle and computedStyle.
         * @param {String} property The style property whose value is returned.
         * @return {String} The current value of the style property for this element.
         */
        getStyle : function(){         
            return view && view.getComputedStyle ?
                function(prop){
                    var el = this.dom,
                        v,                  
                        cs;
                    if(el == document) return null;
                    prop = prop == 'float' ? 'cssFloat' : prop;
                    return (v = el.style[prop]) ? v : 
                           (cs = view.getComputedStyle(el, "")) ? cs[chkCache(prop)] : null;
                } :
                function(prop){      
                    var el = this.dom, 
                        m, 
                        cs;     
                        
                    if(el == document) return null;      
                    if (prop == 'opacity') {
                        if (el.style.filter.match) {                       
                            if(m = el.style.filter.match(/alpha\(opacity=(.*)\)/i)){
                                var fv = parseFloat(m[1]);
                                if(!isNaN(fv)){
                                    return fv ? fv / 100 : 0;
                                }
                            }
                        }
                        return 1;
                    }
                    prop = prop == 'float' ? 'styleFloat' : prop;   
                    return el.style[prop] || ((cs = el.currentStyle) ? cs[chkCache(prop)] : null);
                };
        }(),
        
        /**
         * Return the CSS color for the specified CSS attribute. rgb, 3 digit (like #fff) and valid values
         * are convert to standard 6 digit hex color.
         * @param {String} attr The css attribute
         * @param {String} defaultValue The default value to use when a valid color isn't found
         * @param {String} prefix (optional) defaults to #. Use an empty string when working with
         * color anims.
         */
        getColor : function(attr, defaultValue, prefix){
            var h, 
                v = this.getStyle(attr),
                color = prefix || "#";