When running "jQuery.noConflict(true);" The code that use the first jQuery version may break.
In some cases this, code doesn't even belong to you. You write a script, which is supposed to be added to pages and which uses jQuery, and you know nothing about the hosting page.
A hosting code may load its jQuery version, detected that it was loaded, start working with it, then wait (setTimeout) ,and then your code starts, do "jQuery.noConflict(true);" , and waits till it is loaded. While your code waits, the control may return to the hosting code which tries to run its jQuery and finds that it doesn't exist.
My suggestion, for this case, is to load the jQuery in a different new window, without removing it from the original one. Then, when it is loaded, use the "jQuery.noConflict(true);" on the new window to copy it to the original window. However the new jQuery object is actually running on the new window and its document. So when using the new jQuery the original window.document must be pass as the second parameter like this:
newJq("#elementInOriginalDocument", window.document).html("some text");
Following my implementation for this idea:
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js"></script>
</head>
<body>
Test jQuery
<br />
<span id="hostScope">hostScope</span>
<br />
<span id="guestScope">guestScope</span>
<script>
(function(hostWin){
var myBkl = {
win: null,
doc: null,
jq: null,
loadScript: function(src) {
if (this.doc == null){
var nAgt = navigator.userAgent;
if ((verOffset=nAgt.indexOf("MSIE"))!=-1) {
var iframe = document.createElement('iframe');
iframe.id = "if1";
iframe.src= window.location.href;
document.getElementsByTagName('head')[0].appendChild(iframe);
this.whenIEIFrameLoaded(src, 0);
} else {
var iframe = document.createElement('iframe');
iframe.id = "if1";
document.getElementsByTagName('head')[0].appendChild(iframe);
setTimeout((function() {myBkl.whenIframeLoaded(src); }), 1);
}
}
},
whenIframeLoaded: function(src){
var oIframe = document.getElementById('if1');
var newdocument = (oIframe.contentWindow || oIframe.contentDocument);
if (newdocument.document) {
newdocument = newdocument.document;
}
var newwin = oIframe.contentWindow;
if (newwin.document.documentElement.innerHTML){
newwin.document.documentElement.innerHTML = '<!DOCTYPE html><html><head></head><body>N</body></html>';
}
this.doc = newwin.document;
this.win = newwin;
var script = this.doc.createElement('script');
script.setAttribute('src', src);
script.setAttribute('type', 'text/javascript');
this.doc.getElementsByTagName('head')[0].appendChild(script);
this.whenLoaded(this.callback, 0);
},
whenIEIFrameLoaded: function(src, times){
var oIframe = document.getElementById('if1');
if (oIframe && oIframe.contentWindow && oIframe.contentWindow.document && oIframe.contentWindow.document.body){
var newdocument = (oIframe.contentWindow || oIframe.contentDocument);
if (newdocument.document) {
newdocument = newdocument.document;
}
var script = newdocument.createElement('script');
script.setAttribute('src', src);
script.setAttribute('type', 'text/javascript');
newdocument.getElementsByTagName('head')[0].appendChild(script);
this.doc = newdocument;
this.win = oIframe.contentWindow;
this.whenLoaded(myBkl.callback, 0);
} else {
if (times < 5000){
times++;
setTimeout((function() {myBkl.whenIEIFrameLoaded(src, times); }), 2);
}
}
},
whenLoaded: function(callback, times){
if (this.win && this.win.jQuery && typeof(this.win.jQuery) !== 'undefined' && this.win.jQuery.fn.jquery == '1.3.2') {
myBkl.jq = this.win.jQuery.noConflict(true);
callback(myBkl.jq);
}
else {
if (times < 5000){
times++;
setTimeout((function() {myBkl.whenLoaded(callback, times); }), 5);
}
}
},
callback: function(loadedJq){
hostWin.myJq = loadedJq;
//console.log("callback: The loaded jQuery ver is " + loadedJq.fn.jquery);
whenLoadedOut();
}
};
myBkl.loadScript('http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.js');
})(window);
function whenLoadedOut(){
if (window.jQuery) {
//console.log("Host jQuery ver (window.jQuery.fn.jquery) is " + jQuery.fn.jquery);
//console.log("guest jQuery ver (window.lpJq) is " + myJq.fn.jquery);
$("#hostScope").html("The jQuery ver of host is " + jQuery.fn.jquery);
myJq("#guestScope", document).html("The jQuery ver of guest is " + myJq.fn.jquery);
}
else {
setTimeout((function() {whenLoadedOut(); }), 2);
}
}
</script>
</body>
</html>
