Multiple jQuery includes in a document - javascript

I have a document which uses old jQuery and I need new jQuery for a particular plug-in.
My document structure looks like this:
<html>
<head>
<script type="text/javascript" src="jQuery.old.js"></script>
</head>
<body>
<script>
$("#elem").doSomething(); // use old jQuery
</script>
<!-------- My plugin begins -------->
<script type="text/javascript" src="jQuery.new.js"></script>
<script type="text/javascript" src="jQuery.doSomething.js"></script>
<script>
$().ready(function(){
$("#elem").doSomething(); // use new jQuery
});
</script>
<div id="elem"></div>
<!-------- My plugin ends ---------->
<script>
$("#elem").doSomething(); // use old jQuery
</script>
</body>
</html>
I have googled for this question but found nothing that would look like my case (I need first to load old javascript (in the head) and THEN new (in the body). By the way, in the Firefox looks like old jQuery lib loads and scripts that depends on it works, but script that uses new version, and in IE and Chrome everything is exactly opposite.

To start, you should try running all the plugins under the latest version of jQuery - you may find you can use just the one latest version.
If you cannot do this, you can run in compatibility mode. Here is how.
<script src="jquery-1.3.2.js"></script>
<script>
var jqueryA = jQuery.noConflict();
</script>
<script src="jquery-1.4.2.js"></script>
<script>
var jqueryB = jQuery.noConflict();
</script>
You would need to call
jqueryB("#myelement").....
To use the alternate version.

You should use jQuery.noConflict();
See this example: http://web.enavu.com/daily-tip/using-multiple-versions-of-jquery-on-the-same-page/

As a rule of thumb, stick to one included jquery file. It's quite a large file, and there's no need to import multiple versions. I would opt for the latest version, which can be served from google or microsoft to speed up your server.
Note if you want the "doSomething" event to behave differently depending on where it's called in the page, you could try to bind the event differently. Check out the following example. As with yours, it calls the new version from within your plugin area on the page ready event - this might be later than you expected.
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
</head>
<body>
<div id="elem"></div>
<script>
var oldFunct = function (e,o) { alert("old jquery" + o); };
var newFunct = function (e,o) { alert("new jquery" + o); };
$("#elem").bind("doSomething", oldFunct);
$("#elem").trigger("doSomething", ["1"]);
</script>
<script>
$(document).ready(function(){
$("#elem").bind("doSomething", newFunct);
$("#elem").trigger("doSomething", ["2"]);
$("#elem").bind("doSomething", oldFunct);
});
</script>
<script>
$("#elem").trigger("doSomething", ["3"]);
</script>
</body>
</html>

Related

Why does the popup model stops working when I add order for API [duplicate]

A project I'm working on requires the use of jQuery on customers' Web pages. Customers will insert a chunk of code that we'll supply which includes a few <script> elements that build a widget in a <script>-created <iframe>. If they aren't already using the latest version of jQuery, this will also include (most likely) a <script> for Google's hosted version of jQuery.
The problem is that some customers may already have an older version of jQuery installed. While this may work if it's at least a fairly recent version, our code does rely on some recently introduced functionality in the jQuery library, so there are bound to be instances when a customer's jQuery version is just too old. We can't require that they upgrade to the latest version of jQuery.
Is there any way to load a newer version of jQuery to use only within the context of our code, that will not interfere with, or affect, any code on the customer's page? Ideally, maybe we could check for the presence of jQuery, detect the version, and if it's too old, then somehow load the most recent version just to use for our code.
I had the idea of loading jQuery in an <iframe> in the customer's domain that also includes our <script>, which seems like it might be feasible, but I'm hoping there's a more elegant way to do it (not to mention without the performance and complexity penalties of extra <iframe>s).
Yes, it's doable due to jQuery's noconflict mode. http://blog.nemikor.com/2009/10/03/using-multiple-versions-of-jquery/
<!-- load jQuery 1.1.3 -->
<script type="text/javascript" src="http://example.com/jquery-1.1.3.js"></script>
<script type="text/javascript">
var jQuery_1_1_3 = $.noConflict(true);
</script>
<!-- load jQuery 1.3.2 -->
<script type="text/javascript" src="http://example.com/jquery-1.3.2.js"></script>
<script type="text/javascript">
var jQuery_1_3_2 = $.noConflict(true);
</script>
Then, instead of $('#selector').function();, you'd do jQuery_1_3_2('#selector').function(); or jQuery_1_1_3('#selector').function();.
After looking at this and trying it out I found it actually didn't allow more than one instance of jquery to run at a time. After searching around I found that this did just the trick and was a whole lot less code.
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" type="text/javascript"></script>
<script>var $j = jQuery.noConflict(true);</script>
<script>
$(document).ready(function(){
console.log($().jquery); // This prints v1.4.2
console.log($j().jquery); // This prints v1.9.1
});
</script>
So then adding the "j" after the "$" was all I needed to do.
$j(function() {
$j('.button-pro').on('click', function() {
var el = $('#cnt' + this.id.replace('btn', ''));
$j('#contentnew > div').not(el).animate({
height: "toggle",
opacity: "toggle"
}, 100).hide();
el.toggle();
});
});
Taken from http://forum.jquery.com/topic/multiple-versions-of-jquery-on-the-same-page:
Original page loads his "jquery.versionX.js" -- $ and jQuery belong to versionX.
You call your "jquery.versionY.js" -- now $ and jQuery belong to versionY, plus _$ and _jQuery belong to versionX.
my_jQuery = jQuery.noConflict(true); -- now $ and jQuery belong to versionX, _$ and _jQuery are probably null, and my_jQuery is versionY.
You can have as many different jQuery versions on your page as you want.
Use jQuery.noConflict():
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" type="text/javascript"></script>
<script>
var $i = jQuery.noConflict();
alert($i.fn.jquery);
</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>
var $j = jQuery.noConflict();
alert($j.fn.jquery);
</script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script>
var $k = jQuery.noConflict();
alert($k.fn.jquery);
</script>
DEMO | Source
It is possible to load the second version of the jQuery use it and then restore to the original or keep the second version if there was no jQuery loaded before. Here is an example:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script type="text/javascript">
var jQueryTemp = jQuery.noConflict(true);
var jQueryOriginal = jQuery || jQueryTemp;
if (window.jQuery){
console.log('Original jQuery: ', jQuery.fn.jquery);
console.log('Second jQuery: ', jQueryTemp.fn.jquery);
}
window.jQuery = window.$ = jQueryTemp;
</script>
<script type="text/javascript">
console.log('Script using second: ', jQuery.fn.jquery);
</script>
<script type="text/javascript">
// Restore original jQuery:
window.jQuery = window.$ = jQueryOriginal;
console.log('Script using original or the only version: ', jQuery.fn.jquery);
</script>
I would like to say that you must always use jQuery latest or recent stable versions. However if you need to do some work with others versions then you can add that version and renamed the $ to some other name. For instance
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
<script>var $oldjQuery = $.noConflict(true);</script>
Look here if you write something using $ then you will get the latest version. But if you need to do anything with old then just use$oldjQuery instead of $.
Here is an example:
$(function(){console.log($.fn.jquery)});
$oldjQuery (function(){console.log($oldjQuery.fn.jquery)})
Demo
<script type="text/javascript"
src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>var $j = $.noConflict(true);</script>
It was not working for me then I changed it to
<script>var jQuery = $.noConflict(true);</script>
and it worked for me.
To further improve Juan Vidal's answer, it is worth noting that if you use multiple jquery plugins with one version (eg 3.3.1) and multiple jquery plugins with another version(eg 1.10.2), for older version to work (and it's plugins) you must dig into plugin's minified/unminified .js file(s) and alter the line that will be something like this:
Example 1: module.exports=a:a(jQuery) to module.exports=a:a(my_jQuery)
Example 2: b(a,require("jquery")):b(a,a.jQuery)} to this: or b(a,require("jquery")):b(a,a.my_jQuery)}

How to write some script src <script src=""> in javascript [duplicate]

A project I'm working on requires the use of jQuery on customers' Web pages. Customers will insert a chunk of code that we'll supply which includes a few <script> elements that build a widget in a <script>-created <iframe>. If they aren't already using the latest version of jQuery, this will also include (most likely) a <script> for Google's hosted version of jQuery.
The problem is that some customers may already have an older version of jQuery installed. While this may work if it's at least a fairly recent version, our code does rely on some recently introduced functionality in the jQuery library, so there are bound to be instances when a customer's jQuery version is just too old. We can't require that they upgrade to the latest version of jQuery.
Is there any way to load a newer version of jQuery to use only within the context of our code, that will not interfere with, or affect, any code on the customer's page? Ideally, maybe we could check for the presence of jQuery, detect the version, and if it's too old, then somehow load the most recent version just to use for our code.
I had the idea of loading jQuery in an <iframe> in the customer's domain that also includes our <script>, which seems like it might be feasible, but I'm hoping there's a more elegant way to do it (not to mention without the performance and complexity penalties of extra <iframe>s).
Yes, it's doable due to jQuery's noconflict mode. http://blog.nemikor.com/2009/10/03/using-multiple-versions-of-jquery/
<!-- load jQuery 1.1.3 -->
<script type="text/javascript" src="http://example.com/jquery-1.1.3.js"></script>
<script type="text/javascript">
var jQuery_1_1_3 = $.noConflict(true);
</script>
<!-- load jQuery 1.3.2 -->
<script type="text/javascript" src="http://example.com/jquery-1.3.2.js"></script>
<script type="text/javascript">
var jQuery_1_3_2 = $.noConflict(true);
</script>
Then, instead of $('#selector').function();, you'd do jQuery_1_3_2('#selector').function(); or jQuery_1_1_3('#selector').function();.
After looking at this and trying it out I found it actually didn't allow more than one instance of jquery to run at a time. After searching around I found that this did just the trick and was a whole lot less code.
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" type="text/javascript"></script>
<script>var $j = jQuery.noConflict(true);</script>
<script>
$(document).ready(function(){
console.log($().jquery); // This prints v1.4.2
console.log($j().jquery); // This prints v1.9.1
});
</script>
So then adding the "j" after the "$" was all I needed to do.
$j(function() {
$j('.button-pro').on('click', function() {
var el = $('#cnt' + this.id.replace('btn', ''));
$j('#contentnew > div').not(el).animate({
height: "toggle",
opacity: "toggle"
}, 100).hide();
el.toggle();
});
});
Taken from http://forum.jquery.com/topic/multiple-versions-of-jquery-on-the-same-page:
Original page loads his "jquery.versionX.js" -- $ and jQuery belong to versionX.
You call your "jquery.versionY.js" -- now $ and jQuery belong to versionY, plus _$ and _jQuery belong to versionX.
my_jQuery = jQuery.noConflict(true); -- now $ and jQuery belong to versionX, _$ and _jQuery are probably null, and my_jQuery is versionY.
You can have as many different jQuery versions on your page as you want.
Use jQuery.noConflict():
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" type="text/javascript"></script>
<script>
var $i = jQuery.noConflict();
alert($i.fn.jquery);
</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>
var $j = jQuery.noConflict();
alert($j.fn.jquery);
</script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script>
var $k = jQuery.noConflict();
alert($k.fn.jquery);
</script>
DEMO | Source
It is possible to load the second version of the jQuery use it and then restore to the original or keep the second version if there was no jQuery loaded before. Here is an example:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script type="text/javascript">
var jQueryTemp = jQuery.noConflict(true);
var jQueryOriginal = jQuery || jQueryTemp;
if (window.jQuery){
console.log('Original jQuery: ', jQuery.fn.jquery);
console.log('Second jQuery: ', jQueryTemp.fn.jquery);
}
window.jQuery = window.$ = jQueryTemp;
</script>
<script type="text/javascript">
console.log('Script using second: ', jQuery.fn.jquery);
</script>
<script type="text/javascript">
// Restore original jQuery:
window.jQuery = window.$ = jQueryOriginal;
console.log('Script using original or the only version: ', jQuery.fn.jquery);
</script>
I would like to say that you must always use jQuery latest or recent stable versions. However if you need to do some work with others versions then you can add that version and renamed the $ to some other name. For instance
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
<script>var $oldjQuery = $.noConflict(true);</script>
Look here if you write something using $ then you will get the latest version. But if you need to do anything with old then just use$oldjQuery instead of $.
Here is an example:
$(function(){console.log($.fn.jquery)});
$oldjQuery (function(){console.log($oldjQuery.fn.jquery)})
Demo
<script type="text/javascript"
src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>var $j = $.noConflict(true);</script>
It was not working for me then I changed it to
<script>var jQuery = $.noConflict(true);</script>
and it worked for me.
To further improve Juan Vidal's answer, it is worth noting that if you use multiple jquery plugins with one version (eg 3.3.1) and multiple jquery plugins with another version(eg 1.10.2), for older version to work (and it's plugins) you must dig into plugin's minified/unminified .js file(s) and alter the line that will be something like this:
Example 1: module.exports=a:a(jQuery) to module.exports=a:a(my_jQuery)
Example 2: b(a,require("jquery")):b(a,a.jQuery)} to this: or b(a,require("jquery")):b(a,a.my_jQuery)}

Use of jquery noconflict function when including external js libraries and js code files

Does one need to use jquery noconflict() method in the following
situation.
`<script type="text/javascript" src="jquery-1.8.0.min.js"></script>
<script type="text/javascript" src="jq180customcode.js"></script>
<script type="text/javascript" src="jquery-1.7.1.min.js"></script><script type="text/javascript" src="jq171customcode.js"></script>`
The above situation is when we use different jquery libraries in a
single page and load external files with custom code specific to the
the library mentioned above it.
If one does need to use the jquery noconflict method please show how to
use it.
Here jq180customcode and jq171customcode external javascript files contains script functions which are written keeping in mind the external libraries jq-1.8.0 and jq-1.7.1 libraries respectively that is "jq180customcode.js" contains functions specific for the html page which are created in accordance with "jq-1.8.0.js" and "jq171customcode.js" contains functions specific for the html page which are created in accordance with "jq-1.7.1.js". I specifically want to know whether one needs to use jquery.noconflict in these "customcode" files and if one has to use it how?
A much better solution is not to use multiple copies of jQuery on the same page. Just use one. Ideally something more recent than either of those.
But if you really want to:
<script type="text/javascript" src="jquery-1.8.0.min.js"></script>
<script type="text/javascript" src="jq180customcode.js"></script>
<script>
var jq180 = jQuery.noConflict(true);
</script>
<script type="text/javascript" src="jquery-1.7.1.min.js"></script>
<script type="text/javascript" src="jq171customcode.js"></script>
<script>
var jq171 = jQuery.noConflict(true);
</script>
Note that it's important that jq180customcode.js grab a copy of the jQuery and/or $ symbol right away and store it. One good way is like this:
(function($) {
// The code here
})(jQuery);
Within The code here, the code can use $ to refer to the jQuery that was present when the code was loaded.
In scripts after all of the above, you'd use jq180 or jq171 depending on which copy of jQuery you want to use.
You could leave one or the other noConflict off, of course, and use jQuery (and $) for the other one. For instance (reordering things slightly):
<script type="text/javascript" src="jquery-1.7.1.min.js"></script>
<script type="text/javascript" src="jq171customcode.js"></script>
<script>
var jq171 = jQuery.noConflict(true);
</script>
<script type="text/javascript" src="jquery-1.8.0.min.js"></script>
<script type="text/javascript" src="jq180customcode.js"></script>
Now, you'd use jq171 for jQuery v1.7.1 and either jQuery or $ for jQuery v1.8.0.
Here's a live example of using v1.7.1 and v1.8.0:
<input id="btn1" type="button" value="Click to see jQuery v1.8.0 in use">
<br><input id="btn2" type="button" value="Click to see jQuery v1.7.1 in use">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>
<script>
// Custom v1.8.0 stuff
(function($) {
$("#btn1").click(function() {
$("<p>jQuery version: " + $.fn.jquery + "</p>").appendTo(document.body);
});
})(jQuery);
</script>
<script>
var jq180 = jQuery.noConflict(true);
</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script>
// Custom v1.7.1 stuff
(function($) {
$("#btn2").click(function() {
$("<p>jQuery version: " + $.fn.jquery + "</p>").appendTo(document.body);
});
})(jQuery);
</script>
<script>
var jq171 = jQuery.noConflict(true);
</script>

JavaScript working on fiddle but not in site

Good day!
I have recently acquired a code and was passed on using fiddle. It works fine on the fiddle but when I am trying to implement it on my site.
Head tag contains:
<head>
<title>NQA Insert</title>
<script type="text/javascript" src="NQAa.js">
</script>
</head>
While NQA.js contains:
$('#bill50').on('change', function() {
var date30 = new Date($(this).val());
date30.setDate(date30.getDate()+30);
var date20 = new Date($(this).val());
date20.setDate(date20.getDate()+60);
$('#bill30').val(date30.toJSON().slice(0,10));
$('#bill20').val(date20.toJSON().slice(0,10));
});
Note 1: If you input a date on bill50, the value on bill30 and bill20 also changes.
Note 2: I am implementing this on a php page. Maybe this helps...
Why is it that when implementing it on the site, it doesn't work at all? Is there anything wrong in my calling of the jscript..?
you need to include the jQuery library, as you can see in your jsFiddle he's including jQuery 1.8.3, you should add it in your "head" tag just before the js script you bought.
You'll get something like this:
<head>
<title>NQA Insert</title>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.3.min.js">
<script type="text/javascript" src="NQAa.js">
</script>
</head>

using getScript to import plugin on page using multiple versions of jQuery

I am developing an app on a page that uses jQuery 1.2.6, but I would like to use jQuery 1.4.2 for my app. I really don't like to use multiple versions of jQuery like this but the copy on the page (1.2.6) is something I have no control over. I decided to isolate my code like this:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head>
<script type="text/javascript" src="jquery-1.2.6.min.js>
<script type="text/javascript" src="pageStuff.js"></script>
</head>
<body>
Welcome to our page.
<div id="app">
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="myStuff.js"></script>
</div>
</body></html>
The file myStuff.js has my own code that is supposed to use jQuery 1.4.2, and it looks like this:
(function($) { //wrap everything in function to add ability to use $ var with noConflict
var jQuery = $;
//my code
})(jQuery.noConflict(true));
This is an extremely simplified version, but I hope you get the idea of what I did. For a while, everything worked fine. However, I decided to use a jQuery plugin in a separate file. I tested it and it acted funny. After some experimentation, I found out that the plugin was using the old version of jQuery, when I wanted it to use the new version. Does anyone know how to import and run a js file from the context within the function wrapping the code in myStuff.js?
In case this matters to anyone, here is how I know the plugin is using the old version, and what I did to try to solve the problem: I made a file called test.js, consisting of this line:
alert($.fn.jquery);
I tried referencing the file in a script tag the way external Javascript is usually included, below myStuff.js, and it came up as 1.2.6, like I expected. I then got rid of that script tag and put this line in myStuff.js:
$.getScript("test.js");
and it still came back as 1.2.6. That wasn't a big surprise -- according to jQuery's documentation, scripts included that way are executed in the global context. I then tried doing this instead:
var testFn = $.proxy($.getScript, this);
testFn("test.js");
and it still came back as 1.2.6. After some tinkering, I found out that the "this" keyword referred to the window, which I assume means the global context. I am looking for something to put in place of "this" to refer to the context of the enclosing function, or some other way to make the code in the file run from the enclosing function. I noticed that if I copy and paste the code, it works fine, but it is a big plugin that is used in many places, and I would prefer not to clutter up my file with their code. I am out of ideas. Does anyone else know how to do this?
When you load jQuery, all it does is to create a root jQuery object and set window.jQuery and window.$ to point to it. So you can simply load the old jQuery, copy window.jQuery to window.jQuery126, load the new jQuery, copy window.jQuery to window.jQuery142, and then change window.jQuery and window.$ whenever you want a plugin to use the other version.
This is an ugly and unstable hack but it should work as long as
all code written for the non-default version is encapsulated with (function($){...})($) (proper jQuery plugins should do this, and you can easily ensure it for your own code)
scripts used with different jQuery versions don't mess with each other's stuff (such as one binding an event handler and the other trying to unbind it)
Another, simpler but less maintainable solution is to simply edit the plugin to look like (function($){...})(jQuery142) instead of (function($){...})(jQuery)
Versions
There is a script that specifically attempts to fix this problem: Versions . It's rather old, though.
It's just a neat helper for doing the switching of versions.
While I have not tested this script myself, you can do something like this based on the GitHub repository for the project:
<!-- Old jQuery and it's plugins -->
<script type="text/javascript" src="../jquery/jquery-1.2.6.js"></script>
<script type="text/javascript" src="test-plugin-for-old.js"></script>
<!-- Include the Versions helper -->
<script type="text/javascript" src="versions.js"></script>
<!-- Include a new jQuery -->
<script type="text/javascript" src="../jquery/jquery.js"></script>
<script type="text/javascript">
Versions.add('jquery', 'latest', jQuery.noConflict(true));
Versions.add('jquery', 'default', jQuery);
</script>
<!-- Load a plugin into the new jQuery -->
<script type="text/javascript">jQuery = Versions.use('jquery', 'latest');</script>
<!-- Do whatever you need with the new jQuery -->
<script type="text/javascript" src="test-plugin-for-new.js"></script>
<!-- Finish up and use the old jQuery back -->
<script type="text/javascript">jQuery = Versions.use('jquery', 'default');</script>
On-Demand JavaScript Loading (Lazy Loading)
With that out of the way, there are some ways to do on-demand JavaScript loading, but I don't think they will work well with loading of jQuery since jQuery modifies and requires the presence of the window object.
Also, you might want to read about script loading. There's more details about it in this StackOverflow question and the article pointed out.
RequireJS
In the list, RequireJS is not mentioned. It's rather new and you can do things like:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
<script type="text/javascript" src="pageStuff.js"></script>
</head>
<body>
Welcome to our page.
<div id="app">
<script type="text/javascript" src="require.js"></script>
<script type="text/javascript">
require({context: "1.4.2"},
["http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"],
function() {
console.log($.fn.jquery); // returns 1.4.2
// myStuff.js
});
require({context: "1.2.6"},
["http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"],
function() {
console.log($.fn.jquery); // returns 1.2.6
});
</script>
</div>
</body></html>
I always go for the newest stuff, haha, so I'm recommending this. However, due to the nature of loading the jquery (it modifies window as mentioned above), all references to $ and jQuery outside and beyond the last require in the HTML code block above, will refer to the jQuery 1.2.6.
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" />
<script type="text/javascript">
$new = $.noConflict();
document.write("$new = " + $new.fn.jquery + "<br/>");
document.write("$ = " + $.fn.jquery + "<br/>");
</script>
I just tried this and it seems to work, $ reports to be the old version and you just have to make sure to use $new when invoking jquery for the stuff you want to do with 1.4.2
jQuery is actually a variable in the window context. So whenever you load a jQuery library it will create that variable in the window context if you load it outside any function.
I believe you could do something like this to achieve what you want. Although somewhat restrictive, theoretically it should work:
<script type="text/javascript">
// Get new jQuery code
$.get( "http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js", function (data, textStatus, XMLHttpRequest){
if(data){
// data should contain the file content. eval() it
eval(data);
// Use jQuery 1.4.2 from here, only inside this callback function.
}
}, "html" );
</script>
This is ugly, but should do the trick.
For now, I am going along with Tgr's solution. Here are the details of how I implemented it:
page.html:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html><head>
<script type="text/javascript" src="jquery-1.2.6.min.js>
<script type="text/javascript" src="pageStuff.js"></script>
</head>
<body>
Welcome to our page.
<div id="app">
Here is our app.
<script type="text/javascript">
var oldJQuery = $;
</script>
<script type="text/javascript"
src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="myStuff.js"></script>
</div>
</body></html>
myStuff.js:
var jq142 = jQuery.noConflict(true);
(function($) {
var jQuery = $;
$(function() {
//init app stuff
includeScript("jCarousel.js", function() {
//init carousel stuff
});
});
})(jq142);
function includeScript(URL, callback) {
window.$ = window.jQuery = jq142;
window.$.ajax({
url: URL,
dataType: "script",
error: function() {
window.$ = window.jQuery = oldJQuery;
},
success: function() {
if (typeof callback != "undefined")
callback();
window.$ = window.jQuery = oldJQuery;
},
async: false
});
}
I still don't like the idea of putting another variable (jq142) into the global namespace, but I couldn't think of any reasonable way around it. If I come up with something better, I will post it here.

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