yuiloader-beta.js

Wicket一个开发Java Web应用程序框架。它使得开发web应用程序变得容易而轻松。 Wicket利用一个POJO data beans组件使得它可以与任何持久层技术相结合。

        }
        return o;
    },

    /**
     * Executes the supplied function in the scope of the supplied 
     * object 'when' milliseconds later.  Executes the function a 
     * single time unless periodic is set to true.
     * @method later
     * @since 2.4.0
     * @param when {int} the number of milliseconds to wait until the fn 
     * is executed
     * @param o the scope object
     * @param fn {Function|String} the function to execute or the name of 
     * the method in the 'o' object to execute
     * @param data [Array] data that is provided to the function.  This accepts
     * either a single item or an array.  If an array is provided, the
     * function is executed with one parameter for each array item.  If
     * you need to pass a single array parameter, it needs to be wrapped in
     * an array [myarray]
     * @param periodic {boolean} if true, executes continuously at supplied 
     * interval until canceled
     * @return a timer object. Call the cancel() method on this object to 
     * stop the timer.
     */
    later: function(when, o, fn, data, periodic) {
        when = when || 0; 
        o = o || {};
        var m=fn, d=data, f, r;

        if (YAHOO.lang.isString(fn)) {
            m = o[fn];
        }

        if (!m) {
            throw new TypeError("method undefined");
        }

        if (!YAHOO.lang.isArray(d)) {
            d = [data];
        }

        f = function() {
            m.apply(o, d);
        };

        r = (periodic) ? setInterval(f, when) : setTimeout(f, when);

        return {
            interval: periodic,
            cancel: function() {
                if (this.interval) {
                    clearInterval(r);
                } else {
                    clearTimeout(r);
                }
            }
        };
    },

    /**
     * A convenience method for detecting a legitimate non-null value.
     * Returns false for null/undefined/NaN, true for other values, 
     * including 0/false/''
     * @method isValue
     * @since 2.3.0
     * @param o {any} the item to test
     * @return {boolean} true if it is not null/undefined/NaN || false
     */
    isValue: function(o) {
        // return (o || o === false || o === 0 || o === ''); // Infinity fails
        var l = YAHOO.lang;
return (l.isObject(o) || l.isString(o) || l.isNumber(o) || l.isBoolean(o));
    }

};

/*
 * An alias for <a href="YAHOO.lang.html">YAHOO.lang</a>
 * @class YAHOO.util.Lang
 */
YAHOO.util.Lang = YAHOO.lang;
 
/**
 * Same as YAHOO.lang.augmentObject, except it only applies prototype 
 * properties.  This is an alias for augmentProto.
 * @see YAHOO.lang.augmentObject
 * @method augment
 * @static
 * @param {Function} r  the object to receive the augmentation
 * @param {Function} s  the object that supplies the properties to augment
 * @param {String*|boolean}  arguments zero or more properties methods to 
 *        augment the receiver with.  If none specified, everything
 *        in the supplier will be used unless it would
 *        overwrite an existing property in the receiver.  if true
 *        is specified as the third parameter, all properties will
 *        be applied and will overwrite an existing property in
 *        the receiver
 */
YAHOO.lang.augment = YAHOO.lang.augmentProto;

/**
 * An alias for <a href="YAHOO.lang.html#augment">YAHOO.lang.augment</a>
 * @for YAHOO
 * @method augment
 * @static
 * @param {Function} r  the object to receive the augmentation
 * @param {Function} s  the object that supplies the properties to augment
 * @param {String*}  arguments zero or more properties methods to 
 *        augment the receiver with.  If none specified, everything
 *        in the supplier will be used unless it would
 *        overwrite an existing property in the receiver
 */
YAHOO.augment = YAHOO.lang.augmentProto;
       
/**
 * An alias for <a href="YAHOO.lang.html#extend">YAHOO.lang.extend</a>
 * @method extend
 * @static
 * @param {Function} subc   the object to modify
 * @param {Function} superc the object to inherit
 * @param {Object} overrides  additional properties/methods to add to the
 *        subclass prototype.  These will override the
 *        matching items obtained from the superclass if present.
 */
YAHOO.extend = YAHOO.lang.extend;

YAHOO.register("yahoo", YAHOO, {version: "2.4.1", build: "742"});
/**
 * Provides a mechanism to fetch remote resources and
 * insert them into a document
 * @module get
 * @requires yahoo
 */

/**
 * Fetches and inserts one or more script or link nodes into the document 
 * @namespace YAHOO.util
 * @class YAHOO.util.Get
 */
YAHOO.util.Get = function() {

    /**
     * hash of queues to manage multiple requests
     * @property queues
     * @private
     */
    var queues={}, 
        
    /**
     * queue index used to generate transaction ids
     * @property qidx
     * @type int
     * @private
     */
        qidx=0, 
        
    /**
     * node index used to generate unique node ids
     * @property nidx
     * @type int
     * @private
     */
        nidx=0, 

        // ridx=0,

        // sandboxFrame=null,

    /**
     * interal property used to prevent multiple simultaneous purge 
     * processes
     * @property purging
     * @type boolean
     * @private
     */
        purging=false,

        ua=YAHOO.env.ua, 
        
        lang=YAHOO.lang;
    
    /** 
     * Generates an HTML element, this is not appended to a document
     * @method _node
     * @param type {string} the type of element
     * @param attr {string} the attributes
     * @param win {Window} optional window to create the element in
     * @return {HTMLElement} the generated node
     * @private
     */
    var _node = function(type, attr, win) {
        var w = win || window, d=w.document, n=d.createElement(type);

        for (var i in attr) {
            if (attr[i] && YAHOO.lang.hasOwnProperty(attr, i)) {
                n.setAttribute(i, attr[i]);
            }
        }

        return n;
    };

    /**
     * Generates a link node
     * @method _linkNode
     * @param url {string} the url for the css file
     * @param win {Window} optional window to create the node in
     * @return {HTMLElement} the generated node
     * @private
     */
    var _linkNode = function(url, win) {
        return _node("link", {
                "id": "yui__dyn_" + (nidx++),
                "type": "text/css",
                "rel": "stylesheet",
                "href": url
            }, win);
    };

    /**
     * Generates a script node
     * @method _scriptNode
     * @param url {string} the url for the script file
     * @param win {Window} optional window to create the node in
     * @return {HTMLElement} the generated node
     * @private
     */
    var _scriptNode = function(url, win) {
        return _node("script", {
                "id": "yui__dyn_" + (nidx++),
                "type": "text/javascript",
                "src": url
            }, win);
    };

    /**
     * Returns the data payload for callback functions
     * @method _returnData
     * @private
     */
    var _returnData = function(q) {
        return {
                tId: q.tId,
                win: q.win,
                data: q.data,
                nodes: q.nodes,
                purge: function() {
                    _purge(this.tId);
                }
            };
    };

    /*
     * The request failed, execute fail handler with whatever
     * was accomplished.  There isn't a failure case at the
     * moment unless you count aborted transactions
     * @method _fail
     * @param id {string} the id of the request
     * @private
     */
    var _fail = function(id) {
        var q = queues[id];
        // execute failure callback
        if (q.onFailure) {
            var sc=q.scope || q.win;
            q.onFailure.call(sc, _returnData(q));
        }
    };

    /**
     * The request is complete, so executing the requester's callback
     * @method _finish
     * @param id {string} the id of the request
     * @private
     */
    var _finish = function(id) {
        var q = queues[id];
        q.finished = true;

        if (q.aborted) {
            _fail(id);
            return;
        }

        // execute success callback
        if (q.onSuccess) {
            var sc=q.scope || q.win;
            q.onSuccess.call(sc, _returnData(q));
        }
    };

    /**
     * Loads the next item for a given request
     * @method _next
     * @param id {string} the id of the request
     * @param loaded {string} the url that was just loaded, if any
     * @private
     */
    var _next = function(id, loaded) {
        var q = queues[id];

        if (q.aborted) {
            _fail(id);
            return;
        }

        if (loaded) {
            q.url.shift(); 
            if (q.varName) {
                q.varName.shift(); 
            }
        } else {
            // This is the first pass: make sure the url is an array
            q.url = (lang.isString(q.url)) ? [q.url] : q.url;
            if (q.varName) {
                q.varName = (lang.isString(q.varName)) ? [q.varName] : q.varName;
            }
        }

        var w=q.win, d=w.document, h=d.getElementsByTagName("head")[0], n;

        if (q.url.length === 0) {
            // Safari 2.x workaround - There is no way to know when 
            // a script is ready in versions of Safari prior to 3.x.
            // Adding an extra node reduces the problem, but doesn't
            // eliminate it completely because the browser executes
            // them asynchronously. 
            if (q.type === "script" && ua.webkit && ua.webkit < 420 && 
                    !q.finalpass && !q.varName) {
                // Add another script node.  This does not guarantee that the
                // scripts will execute in order, but it does appear to fix the
                // problem on fast connections more effectively than using an
                // arbitrary timeout.  It is possible that the browser does
                // block subsequent script execution in this case for a limited
                // time.
                var extra = _scriptNode(null, q.win);
                extra.innerHTML='YAHOO.util.Get._finalize("' + id + '");';
                q.nodes.push(extra); h.appendChild(extra);

            } else {
                _finish(id);
            }

            return;
        } 


        var url = q.url[0];

        if (q.type === "script") {
            n = _scriptNode(url, w);
        } else {
            n = _linkNode(url, w);
        }

        // track this node's load progress
        _track(q.type, n, id, url, w, q.url.length);

        // add the node to the queue so we can return it to the user supplied callback
        q.nodes.push(n);

        // add it to the head
        h.appendChild(n);
        

        // FireFox does not support the onload event for link nodes, so there is
        // no way to make the css requests synchronous. This means that the css 
        // rules in multiple files could be applied out of order in this browser
        // if a later request returns before an earlier one.  Safari too.
        if ((ua.webkit || ua.gecko) && q.type === "css") {
            _next(id, url);
        }
    };

    /**
     * Removes processed queues and corresponding nodes
     * @method _autoPurge
     * @private
     */
    var _autoPurge = function() {

        if (purging) {
            return;
        }

        purging = true;
        for (var i in queues) {
            var q = queues[i];
            if (q.autopurge && q.finished) {
                _purge(q.tId);
            }
        }

        purging = false;
    };

    /**
     * Removes the nodes for the specified queue
     * @method _purge
     * @private
     */
    var _purge = function(tId) {
        var q=queues[tId];
        if (q) {
            var n=q.nodes, l=n.length, d=q.win.document, 
                h=d.getElementsByTagName("head")[0];
            for (var i=0; i<l; i=i+1) {
                h.removeChild(n[i]);
            }
        }
    };