+++ /dev/null
-/*
-Copyright (c) 2009, Yahoo! Inc. All rights reserved.
-Code licensed under the BSD License:
-http://developer.yahoo.net/yui/license.txt
-version: 2.7.0
-*/
-/**
- * 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, charset) {
- var c = charset || "utf-8";
- return _node("link", {
- "id": "yui__dyn_" + (nidx++),
- "type": "text/css",
- "charset": c,
- "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, charset) {
- var c = charset || "utf-8";
- return _node("script", {
- "id": "yui__dyn_" + (nidx++),
- "type": "text/javascript",
- "charset": c,
- "src": url
- }, win);
- };
-
- /**
- * Returns the data payload for callback functions
- * @method _returnData
- * @private
- */
- var _returnData = function(q, msg) {
- return {
- tId: q.tId,
- win: q.win,
- data: q.data,
- nodes: q.nodes,
- msg: msg,
- purge: function() {
- _purge(this.tId);
- }
- };
- };
-
- var _get = function(nId, tId) {
- var q = queues[tId],
- n = (lang.isString(nId)) ? q.win.document.getElementById(nId) : nId;
- if (!n) {
- _fail(tId, "target node not found: " + nId);
- }
-
- return n;
- };
-
- /*
- * 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, msg) {
- var q = queues[id];
- // execute failure callback
- if (q.onFailure) {
- var sc=q.scope || q.win;
- q.onFailure.call(sc, _returnData(q, msg));
- }
- };
-
- /**
- * 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) {
- var msg = "transaction " + id + " was aborted";
- _fail(id, msg);
- return;
- }
-
- // execute success callback
- if (q.onSuccess) {
- var sc=q.scope || q.win;
- q.onSuccess.call(sc, _returnData(q));
- }
- };
-
- /**
- * Timeout detected
- * @method _timeout
- * @param id {string} the id of the request
- * @private
- */
- var _timeout = function(id) {
- var q = queues[id];
- if (q.onTimeout) {
- var sc=q.scope || q;
- q.onTimeout.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.timer) {
- // Y.log('cancel timer');
- q.timer.cancel();
- }
-
- if (q.aborted) {
- var msg = "transaction " + id + " was aborted";
- _fail(id, msg);
- 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, q.charset);
- extra.innerHTML='YAHOO.util.Get._finalize("' + id + '");';
- q.nodes.push(extra); h.appendChild(extra);
-
- } else {
- _finish(id);
- }
-
- return;
- }
-
-
- var url = q.url[0];
-
- // if the url is undefined, this is probably a trailing comma problem in IE
- if (!url) {
- q.url.shift();
- return _next(id);
- }
-
-
- if (q.timeout) {
- // Y.log('create timer');
- q.timer = lang.later(q.timeout, q, _timeout, id);
- }
-
- if (q.type === "script") {
- n = _scriptNode(url, w, q.charset);
- } else {
- n = _linkNode(url, w, q.charset);
- }
-
- // 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 or insert it before 'insertBefore'
- if (q.insertBefore) {
- var s = _get(q.insertBefore, id);
- if (s) {
- s.parentNode.insertBefore(n, s);
- }
- } else {
- 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);
- delete queues[i];
- }
- }
-
- 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];
-
- if (q.insertBefore) {
- var s = _get(q.insertBefore, tId);
- if (s) {
- h = s.parentNode;
- }
- }
-
- for (var i=0; i<l; i=i+1) {
- h.removeChild(n[i]);
- }
-
- q.nodes = [];
- }
- };
-
- /**
- * Saves the state for the request and begins loading
- * the requested urls
- * @method queue
- * @param type {string} the type of node to insert
- * @param url {string} the url to load
- * @param opts the hash of options for this request
- * @private
- */
- var _queue = function(type, url, opts) {
-
- var id = "q" + (qidx++);
- opts = opts || {};
-
- if (qidx % YAHOO.util.Get.PURGE_THRESH === 0) {
- _autoPurge();
- }
-
- queues[id] = lang.merge(opts, {
- tId: id,
- type: type,
- url: url,
- finished: false,
- aborted: false,
- nodes: []
- });
-
- var q = queues[id];
- q.win = q.win || window;
- q.scope = q.scope || q.win;
- q.autopurge = ("autopurge" in q) ? q.autopurge :
- (type === "script") ? true : false;
-
- lang.later(0, q, _next, id);
-
- return {
- tId: id
- };
- };
-
- /**
- * Detects when a node has been loaded. In the case of
- * script nodes, this does not guarantee that contained
- * script is ready to use.
- * @method _track
- * @param type {string} the type of node to track
- * @param n {HTMLElement} the node to track
- * @param id {string} the id of the request
- * @param url {string} the url that is being loaded
- * @param win {Window} the targeted window
- * @param qlength the number of remaining items in the queue,
- * including this one
- * @param trackfn {Function} function to execute when finished
- * the default is _next
- * @private
- */
- var _track = function(type, n, id, url, win, qlength, trackfn) {
- var f = trackfn || _next;
-
- // IE supports the readystatechange event for script and css nodes
- if (ua.ie) {
- n.onreadystatechange = function() {
- var rs = this.readyState;
- if ("loaded" === rs || "complete" === rs) {
- n.onreadystatechange = null;
- f(id, url);
- }
- };
-
- // webkit prior to 3.x is problemmatic
- } else if (ua.webkit) {
-
- if (type === "script") {
-
- // Safari 3.x supports the load event for script nodes (DOM2)
- if (ua.webkit >= 420) {
-
- n.addEventListener("load", function() {
- f(id, url);
- });
-
- // Nothing can be done with Safari < 3.x except to pause and hope
- // for the best, particularly after last script is inserted. The
- // scripts will always execute in the order they arrive, not
- // necessarily the order in which they were inserted. To support
- // script nodes with complete reliability in these browsers, script
- // nodes either need to invoke a function in the window once they
- // are loaded or the implementer needs to provide a well-known
- // property that the utility can poll for.
- } else {
- // Poll for the existence of the named variable, if it
- // was supplied.
- var q = queues[id];
- if (q.varName) {
- var freq=YAHOO.util.Get.POLL_FREQ;
- q.maxattempts = YAHOO.util.Get.TIMEOUT/freq;
- q.attempts = 0;
- q._cache = q.varName[0].split(".");
- q.timer = lang.later(freq, q, function(o) {
- var a=this._cache, l=a.length, w=this.win, i;
- for (i=0; i<l; i=i+1) {
- w = w[a[i]];
- if (!w) {
- // if we have exausted our attempts, give up
- this.attempts++;
- if (this.attempts++ > this.maxattempts) {
- var msg = "Over retry limit, giving up";
- q.timer.cancel();
- _fail(id, msg);
- } else {
- }
- return;
- }
- }
-
-
- q.timer.cancel();
- f(id, url);
-
- }, null, true);
- } else {
- lang.later(YAHOO.util.Get.POLL_FREQ, null, f, [id, url]);
- }
- }
- }
-
- // FireFox and Opera support onload (but not DOM2 in FF) handlers for
- // script nodes. Opera, but not FF, supports the onload event for link
- // nodes.
- } else {
- n.onload = function() {
- f(id, url);
- };
- }
- };
-
- return {
-
- /**
- * The default poll freqency in ms, when needed
- * @property POLL_FREQ
- * @static
- * @type int
- * @default 10
- */
- POLL_FREQ: 10,
-
- /**
- * The number of request required before an automatic purge.
- * property PURGE_THRESH
- * @static
- * @type int
- * @default 20
- */
- PURGE_THRESH: 20,
-
- /**
- * The length time to poll for varName when loading a script in
- * Safari 2.x before the transaction fails.
- * property TIMEOUT
- * @static
- * @type int
- * @default 2000
- */
- TIMEOUT: 2000,
-
- /**
- * Called by the the helper for detecting script load in Safari
- * @method _finalize
- * @param id {string} the transaction id
- * @private
- */
- _finalize: function(id) {
- lang.later(0, null, _finish, id);
- },
-
- /**
- * Abort a transaction
- * @method abort
- * @param {string|object} either the tId or the object returned from
- * script() or css()
- */
- abort: function(o) {
- var id = (lang.isString(o)) ? o : o.tId;
- var q = queues[id];
- if (q) {
- q.aborted = true;
- }
- },
-
- /**
- * Fetches and inserts one or more script nodes into the head
- * of the current document or the document in a specified window.
- *
- * @method script
- * @static
- * @param url {string|string[]} the url or urls to the script(s)
- * @param opts {object} Options:
- * <dl>
- * <dt>onSuccess</dt>
- * <dd>
- * callback to execute when the script(s) are finished loading
- * The callback receives an object back with the following
- * data:
- * <dl>
- * <dt>win</dt>
- * <dd>the window the script(s) were inserted into</dd>
- * <dt>data</dt>
- * <dd>the data object passed in when the request was made</dd>
- * <dt>nodes</dt>
- * <dd>An array containing references to the nodes that were
- * inserted</dd>
- * <dt>purge</dt>
- * <dd>A function that, when executed, will remove the nodes
- * that were inserted</dd>
- * <dt>
- * </dl>
- * </dd>
- * <dt>onFailure</dt>
- * <dd>
- * callback to execute when the script load operation fails
- * The callback receives an object back with the following
- * data:
- * <dl>
- * <dt>win</dt>
- * <dd>the window the script(s) were inserted into</dd>
- * <dt>data</dt>
- * <dd>the data object passed in when the request was made</dd>
- * <dt>nodes</dt>
- * <dd>An array containing references to the nodes that were
- * inserted successfully</dd>
- * <dt>purge</dt>
- * <dd>A function that, when executed, will remove any nodes
- * that were inserted</dd>
- * <dt>
- * </dl>
- * </dd>
- * <dt>onTimeout</dt>
- * <dd>
- * callback to execute when a timeout occurs.
- * The callback receives an object back with the following
- * data:
- * <dl>
- * <dt>win</dt>
- * <dd>the window the script(s) were inserted into</dd>
- * <dt>data</dt>
- * <dd>the data object passed in when the request was made</dd>
- * <dt>nodes</dt>
- * <dd>An array containing references to the nodes that were
- * inserted</dd>
- * <dt>purge</dt>
- * <dd>A function that, when executed, will remove the nodes
- * that were inserted</dd>
- * <dt>
- * </dl>
- * </dd>
- * <dt>scope</dt>
- * <dd>the execution context for the callbacks</dd>
- * <dt>win</dt>
- * <dd>a window other than the one the utility occupies</dd>
- * <dt>autopurge</dt>
- * <dd>
- * setting to true will let the utilities cleanup routine purge
- * the script once loaded
- * </dd>
- * <dt>data</dt>
- * <dd>
- * data that is supplied to the callback when the script(s) are
- * loaded.
- * </dd>
- * <dt>varName</dt>
- * <dd>
- * variable that should be available when a script is finished
- * loading. Used to help Safari 2.x and below with script load
- * detection. The type of this property should match what was
- * passed into the url parameter: if loading a single url, a
- * string can be supplied. If loading multiple scripts, you
- * must supply an array that contains the variable name for
- * each script.
- * </dd>
- * <dt>insertBefore</dt>
- * <dd>node or node id that will become the new node's nextSibling</dd>
- * </dl>
- * <dt>charset</dt>
- * <dd>Node charset, default utf-8</dd>
- * <dt>timeout</dt>
- * <dd>Number of milliseconds to wait before aborting and firing the timeout event</dd>
- * <pre>
- * // assumes yahoo, dom, and event are already on the page
- * YAHOO.util.Get.script(
- * ["http://yui.yahooapis.com/2.3.1/build/dragdrop/dragdrop-min.js",
- * "http://yui.yahooapis.com/2.3.1/build/animation/animation-min.js"], {
- * onSuccess: function(o) {
- * new YAHOO.util.DDProxy("dd1"); // also new o.reference("dd1"); would work
- * this.log("won't cause error because YAHOO is the scope");
- * this.log(o.nodes.length === 2) // true
- * // o.purge(); // optionally remove the script nodes immediately
- * },
- * onFailure: function(o) {
- * },
- * data: "foo",
- * timeout: 10000, // 10 second timeout
- * scope: YAHOO,
- * // win: otherframe // target another window/frame
- * autopurge: true // allow the utility to choose when to remove the nodes
- * });
- * </pre>
- * @return {tId: string} an object containing info about the transaction
- */
- script: function(url, opts) { return _queue("script", url, opts); },
-
- /**
- * Fetches and inserts one or more css link nodes into the
- * head of the current document or the document in a specified
- * window.
- * @method css
- * @static
- * @param url {string} the url or urls to the css file(s)
- * @param opts Options:
- * <dl>
- * <dt>onSuccess</dt>
- * <dd>
- * callback to execute when the css file(s) are finished loading
- * The callback receives an object back with the following
- * data:
- * <dl>win</dl>
- * <dd>the window the link nodes(s) were inserted into</dd>
- * <dt>data</dt>
- * <dd>the data object passed in when the request was made</dd>
- * <dt>nodes</dt>
- * <dd>An array containing references to the nodes that were
- * inserted</dd>
- * <dt>purge</dt>
- * <dd>A function that, when executed, will remove the nodes
- * that were inserted</dd>
- * <dt>
- * </dl>
- * </dd>
- * <dt>scope</dt>
- * <dd>the execution context for the callbacks</dd>
- * <dt>win</dt>
- * <dd>a window other than the one the utility occupies</dd>
- * <dt>data</dt>
- * <dd>
- * data that is supplied to the callbacks when the nodes(s) are
- * loaded.
- * </dd>
- * <dt>insertBefore</dt>
- * <dd>node or node id that will become the new node's nextSibling</dd>
- * <dt>charset</dt>
- * <dd>Node charset, default utf-8</dd>
- * </dl>
- * <pre>
- * YAHOO.util.Get.css("http://yui.yahooapis.com/2.3.1/build/menu/assets/skins/sam/menu.css");
- * </pre>
- * <pre>
- * YAHOO.util.Get.css(["http://yui.yahooapis.com/2.3.1/build/menu/assets/skins/sam/menu.css",
- * </pre>
- * @return {tId: string} an object containing info about the transaction
- */
- css: function(url, opts) {
- return _queue("css", url, opts);
- }
- };
-}();
-
-YAHOO.register("get", YAHOO.util.Get, {version: "2.7.0", build: "1799"});
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