element-beta.js

这是YUI的源码及相关示例。里面有很多很炫的Javascript效果。

/*
Copyright (c) 2008, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.6.0
*/
/**
 * Provides Attribute configurations.
 * @namespace YAHOO.util
 * @class Attribute
 * @constructor
 * @param hash {Object} The intial Attribute.
 * @param {YAHOO.util.AttributeProvider} The owner of the Attribute instance.
 */

YAHOO.util.Attribute = function(hash, owner) {
    if (owner) { 
        this.owner = owner;
        this.configure(hash, true);
    }
};

YAHOO.util.Attribute.prototype = {
	/**
     * The name of the attribute.
	 * @property name
	 * @type String
	 */
    name: undefined,
    
	/**
     * The value of the attribute.
	 * @property value
	 * @type String
	 */
    value: null,
    
	/**
     * The owner of the attribute.
	 * @property owner
	 * @type YAHOO.util.AttributeProvider
	 */
    owner: null,
    
	/**
     * Whether or not the attribute is read only.
	 * @property readOnly
	 * @type Boolean
	 */
    readOnly: false,
    
	/**
     * Whether or not the attribute can only be written once.
	 * @property writeOnce
	 * @type Boolean
	 */
    writeOnce: false,

	/**
     * The attribute's initial configuration.
     * @private
	 * @property _initialConfig
	 * @type Object
	 */
    _initialConfig: null,
    
	/**
     * Whether or not the attribute's value has been set.
     * @private
	 * @property _written
	 * @type Boolean
	 */
    _written: false,
    
	/**
     * The method to use when setting the attribute's value.
     * The method recieves the new value as the only argument.
	 * @property method
	 * @type Function
	 */
    method: null,
    
	/**
     * The validator to use when setting the attribute's value.
	 * @property validator
	 * @type Function
     * @return Boolean
	 */
    validator: null,
    
    /**
     * Retrieves the current value of the attribute.
     * @method getValue
     * @return {any} The current value of the attribute.
     */
    getValue: function() {
        return this.value;
    },
    
    /**
     * Sets the value of the attribute and fires beforeChange and change events.
     * @method setValue
     * @param {Any} value The value to apply to the attribute.
     * @param {Boolean} silent If true the change events will not be fired.
     * @return {Boolean} Whether or not the value was set.
     */
    setValue: function(value, silent) {
        var beforeRetVal;
        var owner = this.owner;
        var name = this.name;
        
        var event = {
            type: name, 
            prevValue: this.getValue(),
            newValue: value
        };
        
        if (this.readOnly || ( this.writeOnce && this._written) ) {
            return false; // write not allowed
        }
        
        if (this.validator && !this.validator.call(owner, value) ) {
            return false; // invalid value
        }

        if (!silent) {
            beforeRetVal = owner.fireBeforeChangeEvent(event);
            if (beforeRetVal === false) {
                return false;
            }
        }

        if (this.method) {
            this.method.call(owner, value);
        }
        
        this.value = value;
        this._written = true;
        
        event.type = name;
        
        if (!silent) {
            this.owner.fireChangeEvent(event);
        }
        
        return true;
    },
    
    /**
     * Allows for configuring the Attribute's properties.
     * @method configure
     * @param {Object} map A key-value map of Attribute properties.
     * @param {Boolean} init Whether or not this should become the initial config.
     */
    configure: function(map, init) {
        map = map || {};

        this._written = false; // reset writeOnce
        this._initialConfig = this._initialConfig || {};
        
        for (var key in map) {
            if ( map.hasOwnProperty(key) ) {
                this[key] = map[key];
                if (init) {
                    this._initialConfig[key] = map[key];
                }
            }
        }
    },
    
    /**
     * Resets the value to the initial config value.
     * @method resetValue
     * @return {Boolean} Whether or not the value was set.
     */
    resetValue: function() {
        return this.setValue(this._initialConfig.value);
    },
    
    /**
     * Resets the attribute config to the initial config state.
     * @method resetConfig
     */
    resetConfig: function() {
        this.configure(this._initialConfig);
    },
    
    /**
     * Resets the value to the current value.
     * Useful when values may have gotten out of sync with actual properties.
     * @method refresh
     * @return {Boolean} Whether or not the value was set.
     */
    refresh: function(silent) {
        this.setValue(this.value, silent);
    }
};

(function() {
    var Lang = YAHOO.util.Lang;

    /*
    Copyright (c) 2006, Yahoo! Inc. All rights reserved.
    Code licensed under the BSD License:
    http://developer.yahoo.net/yui/license.txt
    */
    
    /**
     * Provides and manages YAHOO.util.Attribute instances
     * @namespace YAHOO.util
     * @class AttributeProvider
     * @uses YAHOO.util.EventProvider
     */
    YAHOO.util.AttributeProvider = function() {};

    YAHOO.util.AttributeProvider.prototype = {
        
        /**
         * A key-value map of Attribute configurations
         * @property _configs
         * @protected (may be used by subclasses and augmentors)
         * @private
         * @type {Object}
         */
        _configs: null,
        /**
         * Returns the current value of the attribute.
         * @method get
         * @param {String} key The attribute whose value will be returned.
         * @return {Any} The current value of the attribute.
         */
        get: function(key){
            this._configs = this._configs || {};
            var config = this._configs[key];
            
            if (!config || !this._configs.hasOwnProperty(key)) {
                return undefined;
            }
            
            return config.value;
        },
        
        /**
         * Sets the value of a config.
         * @method set
         * @param {String} key The name of the attribute
         * @param {Any} value The value to apply to the attribute
         * @param {Boolean} silent Whether or not to suppress change events
         * @return {Boolean} Whether or not the value was set.
         */
        set: function(key, value, silent){
            this._configs = this._configs || {};
            var config = this._configs[key];
            
            if (!config) {
                return false;
            }
            
            return config.setValue(value, silent);
        },
    
        /**
         * Returns an array of attribute names.
         * @method getAttributeKeys
         * @return {Array} An array of attribute names.
         */
        getAttributeKeys: function(){
            this._configs = this._configs;
            var keys = [];
            var config;
            for (var key in this._configs) {
                config = this._configs[key];
                if ( Lang.hasOwnProperty(this._configs, key) && 
                        !Lang.isUndefined(config) ) {
                    keys[keys.length] = key;
                }
            }
            
            return keys;
        },
        
        /**
         * Sets multiple attribute values.
         * @method setAttributes
         * @param {Object} map  A key-value map of attributes
         * @param {Boolean} silent Whether or not to suppress change events
         */
        setAttributes: function(map, silent){
            for (var key in map) {
                if ( Lang.hasOwnProperty(map, key) ) {
                    this.set(key, map[key], silent);
                }
            }
        },
    
        /**
         * Resets the specified attribute's value to its initial value.
         * @method resetValue
         * @param {String} key The name of the attribute
         * @param {Boolean} silent Whether or not to suppress change events
         * @return {Boolean} Whether or not the value was set
         */
        resetValue: function(key, silent){
            this._configs = this._configs || {};
            if (this._configs[key]) {
                this.set(key, this._configs[key]._initialConfig.value, silent);
                return true;
            }
            return false;
        },
    
        /**
         * Sets the attribute's value to its current value.
         * @method refresh
         * @param {String | Array} key The attribute(s) to refresh
         * @param {Boolean} silent Whether or not to suppress change events
         */
        refresh: function(key, silent) {
            this._configs = this._configs || {};
            var configs = this._configs;
            
            key = ( ( Lang.isString(key) ) ? [key] : key ) || 
                    this.getAttributeKeys();
            
            for (var i = 0, len = key.length; i < len; ++i) { 
                if (configs.hasOwnProperty(key[i])) {
                    this._configs[key[i]].refresh(silent);
                }
            }
        },
    
        /**
         * Adds an Attribute to the AttributeProvider instance. 
         * @method register
         * @param {String} key The attribute's name