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86 lines
3.3 KiB
JavaScript
86 lines
3.3 KiB
JavaScript
15 years ago
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dojo.provide("dojox.io.scriptFrame");
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dojo.require("dojo.io.script");
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dojo.require("dojo.io.iframe");
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//This module extends dojo.io.script to use an iframe for the dojo.io.script.attach calls
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//if the frameDoc argument is passed to dojo.io.script.get(), and if frameDoc is a string (representing
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//the DOM ID of an iframe that should be used for the connection. If frameDoc is not a string, then
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//it is probably a document object, and dojox.io.scriptFrame should not get involved with the request.
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//This is useful in some long-polling comet situations in Firefox and Opera. Those browsers execute scripts
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//in DOM order, not network-receive order, so a long-polling script will block other
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//dynamically appended scripts from running until it completes. By using an iframe
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//for the dojo.io.script requests, this issue can be avoided.
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//WARNING: the url argument to dojo.io.script MUST BE relative to the iframe document's location,
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//NOT the parent page location. This iframe document's URL will be (dojo.moduleUrl("dojo", "resources/blank.html")
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//or djConfig.dojoBlankHtmlUrl (for xdomain loading).
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(function(){
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var ioScript = dojo.io.script;
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dojox.io.scriptFrame = {
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_waiters: {},
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_loadedIds: {},
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_getWaiters: function(/*String*/frameId){
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return this._waiters[frameId] || (this._waiters[frameId] = []);
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},
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_fixAttachUrl: function(/*String*/url){
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//summary: fixes the URL so that
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},
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_loaded: function(/*String*/frameId){
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//summary: callback used when waiting for a frame to load (related to the usage of
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//the frameId argument to dojo.io.script.get().
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var waiters = this._getWaiters(frameId);
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this._loadedIds[frameId] = true;
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this._waiters[frameId] = null;
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for(var i = 0; i < waiters.length; i++){
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var ioArgs = waiters[i];
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ioArgs.frameDoc = dojo.io.iframe.doc(dojo.byId(frameId));
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ioScript.attach(ioArgs.id, ioArgs.url, ioArgs.frameDoc);
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}
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}
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};
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//Hold on to the old _canAttach function.
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var oldCanAttach = ioScript._canAttach;
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var scriptFrame = dojox.io.scriptFrame;
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//Define frame-aware _canAttach method on dojo.io.script
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ioScript._canAttach = function(/*Object*/ioArgs){
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//summary: provides an override of dojo.io.script._canAttach to check for
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//the existence of a the args.frameDoc property. If it is there, and it is a string,
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//not a document, then create the iframe with an ID of frameDoc, and use that for the calls.
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//If frameDoc is a document, then dojox.io.scriptFrame should not get involved.
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var fId = ioArgs.args.frameDoc;
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if(fId && dojo.isString(fId)){
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var frame = dojo.byId(fId);
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var waiters = scriptFrame._getWaiters(fId);
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if(!frame){
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//Need to create frame, but the frame document, which *must* be
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//on the same domain as the page (set djConfig.dojoBlankHtmlUrl
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//if using xdomain loading). Loading of the frame document is asynchronous,
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//so we need to do callback stuff.
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waiters.push(ioArgs);
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dojo.io.iframe.create(fId, dojox._scopeName + ".io.scriptFrame._loaded('" + fId + "');");
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}else{
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//Frame loading could still be happening. Only call attach if the frame has loaded.
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if(scriptFrame._loadedIds[fId]){
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ioArgs.frameDoc = dojo.io.iframe.doc(frame);
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this.attach(ioArgs.id, ioArgs.url, ioArgs.frameDoc);
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}else{
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waiters.push(ioArgs);
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}
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}
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return false;
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}else{
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return oldCanAttach.apply(this, arguments);
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}
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}
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})();
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