I've got the following situation
A rails application that makes use of rjs / Scriptaculous to offer AJAX functionality
Lot of nice javascript written using jQuery (for a separate application)
I want to combine the two and use my jQuery based functionality in my Rails application, but I'm worried about jQuery and Scriptaculous clashing (they both define the $() function, etc).
What is my easiest option to bring the two together? Thanks!
jQuery.noConflict();
Then use jQuery instead of $ to refer to jQuery. e.g.,
jQuery('div.foo').doSomething()
If you need to adapt jQuery code that uses $, you can surround it with this:
(function($) {
...your code here...
})(jQuery);
I believe it's jQuery.noConflict().
You can call it standalone like this:
jQuery.noConflict();
jQuery('div').hide();
Or you can assign it to another variable of your choosing:
var $j = jQuery.noConflict();
$j('div').hide();
Or you can keep using jQuery's $ function inside a block like this:
jQuery.noConflict();
// Put all your code in your document ready area
jQuery(document).ready(function($){
// Do jQuery stuff using $
$("div").hide();
});
// Use Prototype with $(...), etc.
$('someid').hide();
For more information, see Using jQuery with Other Libraries in the jQuery documentation.
jRails is a drop-in replacement for scriptaculous/prototype in Rails using the jQuery library, it does exactly what you're looking for.
Related
We have a page which conatins jQuery and third party JavaScript API. This api inserts jQuery dynamically during run-time into the page. It causes conflictions.
How can I prevent the third party API to add jQuery to the page?
My answer should be applied by the them not you, first Rule for Third-Party Javascript is:
"You Don't own the website"
so if they want to use jQuery then they have to use jQuery noConflict that is the best way to deal with a website working with multiple jQuery versions (Yours and theirs):
Completely move jQuery to a new namespace in another object.
var j = jQuery.noConflict(true);
// then you can say
j( "div p" ).hide();
if you add this line and then define a new jQuery then j will be an alias for old version and jQuery - $ will be an alias for the new version by default.
if you want to make sure; you can check the versions of jQuery present in your page:
j.fn.jquery // this should show you your jQuery version
jQuery.fn.jquery // this should show you their jQuery version
you can use it if you still need to use this third-party javascript and no way for them to change their code you can read more about jQuery noconflict
You can assign jQuery to a namespace you use as: mycode.$ and mycode.jQuery so you can later use:
mycode.$("div p")
this is always safer to use namespace to make sure no one else write in same code may override your variables.
There isn't really a way to stop a script from running that you pull in. I was dealing with something similar yesterday. There are ways to overwrite the changes it does obviously but there is no dynamic way to just stop it from running other than to just not pull it in.
I want to ask is there any practical reason where jQuery.noConflict function is needed utmost?
In layman terms I am asking, what is the reason behind the evolution of this function?
You are using another library which also using $.
You have to use multiple versions of jQuery, mostly because the
plugins depends on different version of jQuery.
The jQuery library and virtually all of its plugins are contained within the jQuery namespace. As a general rule, global objects are stored inside the jQuery namespace as well, so you shouldn't get a clash between jQuery and any other library (like prototype.js, MooTools, or YUI).
That said, there is one caveat: by default, jQuery uses $ as a shortcut for jQuery. Thus, if you are using another JavaScript library that uses the $ variable, you can run into conflicts with jQuery. In order to avoid these conflicts, you need to put jQuery in no-conflict mode immediately after it is loaded onto the page and before you attempt to use jQuery in your page.
for E.g
<script src="other_lib.js"></script>
<script src="jquery.js"></script>
<script>
$.noConflict();
// Code that uses other library's $ can follow here.
</script>
you can read more here http://learn.jquery.com/using-jquery-core/avoid-conflicts-other-libraries/
I am developing a new JS library. I want to include JQuery as core part of it.
My library is supposed to work on all kind of websites, so in those sites JQuery may be already included with different version , may have some other library which may conflict with JQuery inside my library.
jQuery.noConflict();
may not be a complete solution , since it will remove variables from the global scope. My library don't want to change any other settings by user.
So how can i avoid these issues
Conflict with other library ? ($ alias - may be jQuery.noConflict();).
Conflict with other versions of JQuery , if it is already included in the web page.
Thanks in advance. Please don't tell that not include JQuery , use normal JS :)
It's very simple.
First load your preferred jQuery, and get a handle to that by omitting any conflicts from already existing jQuery by using,
$yourJQ = window.jQuery.noConflict(true);
Use $yourJQ in a anonymous scope in all the functions that you want use your jQuery. Like this,
(function($){
// external library code
})($yourJQ);
Hope this helps
Also visit http://alexmarandon.com/articles/web_widget_jquery/
Well regardless of whether you remove variables from the global scope or not you will have to do a find & replace to change which library points at which version of jQuery; because they will either use $ or jQuery & conflict in the global scope, anyway. You could try something like this:
Load first version of jQuery
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.js"></script>
<script type="text/javascript">
jQuery.noConflict();
(function(window,$) {
window.jQuery_v1 = $;
})(window,jQuery);
delete jQuery;
</script>
Load second version of jQuery
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.js"></script>
<script type="text/javascript">
jQuery.noConflict();
(function(window,$) {
window.jQuery_v2 = $;
})(window,jQuery);
delete jQuery;
</script>
Use both versions of jQuery
<script type="text/javascript">
// this is now one version of jQuery
console.log(jQuery_v1);
// this is now another version of jQuery
console.log(jQuery_v2);
</script>
I'm scraping a news website with PHP and injecting the Jquery library in the head, along with my own script which depends on Jquery. I have experienced some loss of functionality regarding some websites. So I was wondering if it would be possible to make the Jquery library function only for my script and thus not "assimilating" itself with other scripts on the page.
I have Googled for this but all I can find is Jquery noConflict() but it doesn't get the job done.
jQuery noConflict is the way to go but remember you will need to name your no conflict copy and then use this copy of jQuery for your code:
var $j = jQuery.noConflict();
// $j is now an alias to the jQuery function; creating the new alias is optional.
$j(document).ready(function() {
$j( "div" ).hide();
});
See more here: http://learn.jquery.com/using-jquery-core/avoid-conflicts-other-libraries/
What about editing jQuery library itself so it is called something else.
Embed the jQuery object via PHP to not have this huge chunk of jQuery code (more readable if you can inject with PHP, but not required, or use a script tag that points to your server).
Customize jQuery to be not "jQuery" or "$".
Then, to customize jQuery, download jQuery and look at the very bottom, it says:
// Add your customized jquery here
window.jQuery = window.$ = jQuery;
Change this line to something else:
// Expose jQuery to the global object
window.myQuery = window.$$$$$$$$$ = jQuery;
I have a project that requires a custom JavaScript library to be included in end user's websites. Sort of a third party thing, think JavaScript tracking like Google Analytics.
We'll have no control over what other JS libraries/frameworks might also be loaded or what versions.
I'd like to be able to leverage jQuery's event delegation, selector and AJAX functionalities but:
Not cause any conflicts with other libraries or other versions of
jQuery that might be loaded
Not require the end user to have to think
about including jQuery separately.
So, rolling in all of jQuery sort of seems like overkill but again, event delegation, selector and AJAX are required. I know jQuery's sizzel engine is broken out in such a way that it's possible to include it in 3rd party libraries and there are plenty of tiny AJAX libraries but we need good event delegation support as well. Additionally, I foresee us needing to do some heavy DOM lifting with this library in the near future as well so it's arguable we do need most of jQuery's functionality.
Any suggestions on how to encapsulate jQuery in such a way that we don't trample over anyone's code? Also, how advisable is this? It does feel a tad iffy.
Also, what's the best wat to encapsulate it into another library? Is there a better way than this?:
(function(window){
window.myNamespace = {
_jq:null,
init: function(){
// Include jQuery
myNamespace.setJq();
},
setJq:function(){
/*! jQuery v1.8.2 jquery.com | jquery.org/license */
(function(a,b){function G(a){...}}) // <- minified jQuery
// Stash a local copy of jQuery
myNamespace._jq = jQuery;
// Return $ and jQuery namespace
$.noConflict(true);
}
}
})(window)
(We intend on offering a version of the library without jQuery for those savvy enough to know that it's already loaded on their page and what version they're using)
Have a look at jQuery in Parts: https://github.com/mythz/jquip
What about dong a conditional load... Test if $ exists. If it does, don't load the script. If it doesn't, then load it.
You could use the following pattern to make sure that the jQuery is being passed in to the function and then you can map it to the local variable $ without issues.
(function(window,$){
//use $ as a local jQuery variable
})(window,jQuery);