I have been using jQuery for quite a few years now, and after I include the jQuery scripts in whatever site I am working on, I would always use the $ for jQuery objects. For example:
$('#my_selector').click(function(){...
I had built a website a few years ago in Joomla 1.6 with over 200 pages and jQuery used in almost all of them, all with the $. Now I am rebuilding the site in Joomla 3.3.0. The funny thing is, now sometimes the $ just doesn't work when identifying jQuery objects, but when I use jQuery it works. For example. the above code example would have to be changed to this:
jQuery('#my_selector').click(function(){...
And that works. And the final strangest thing is that on one page, it seems like the $ works for some of the jQuery but not all. The error that I see is this one:
TypeError: undefined is not a function
Seems like the problem occurs mostly on the functions that run after load complete circumstances. Anyway I am just wondering if people out there know why the $ would stop working with identifying the jQuery functions and objects.
Thanks!
You are most probably using a conflicting library, meaning: another script/library that declares (and thus overrides) the variable $. Wrap all your code in a closure, and you should be good:
(function($) {
$('#my_selector').doStuff();
})(jQuery)
Or, if it needs to be executed after document ready:
jQuery(document).ready(function($) {
$('#my_selector').doStuff();
});
Joomla 3.x is moving progressively to jQuery and replacing all MooTools dependencies along the way.
The default state is to load jQuery in noConflict() mode, but depending on features used on any given page by extensions (templates,plug-ins, components or modules) MooTools may also be loaded.
That means that on some pages, jQuery is defined and not $ and on other pages both are defined, obviously this will result in the issues you are seeing.
Add to that most third-party extensions from the 1.6 era (you have been upgrading to the 2.5.x line along the way right?) just ignored what-ever was going on and loaded whatever they needed (potentially blowing away other libraries) you generally will have to sort out all the conflicts first.
The only guaranteed way to use jQuery is by using the jQuery prefix.
You can read about using JavaScript frameworks with Joomla here, amongst other things it gives you future proof mechanism built-in to Joomla for loading jQuery.
To load jQuery, use: JHtml::_('jquery.framework');
To load the jQuery UI core call: JHtml::_('jquery.ui');
As has been mentioned you can wrap your JavaScript in a closure, in fact this is what the core com_banners does in /media/cbanner.js
var jQuery;
(function ($) {
$(document).ready(function () {
$('#jform_type').on('change', function (a, params) {
var v = typeof(params) !== 'object' ? $('#jform_type').val() : params.selected;
switch (v) {
case '0':
// Image
$('#image, #url').show();
$('#custom').hide();
break;
case '1':
// Custom
$('#image, #url').hide();
$('#custom').show();
break;
}
});
});
})(jQuery);
Are you or joomla using mootools or any other library with the $?
This would mean there is a conflict and the right way to solve it, is by using jQuery instead of $.
Related
I am pretty sure this must have been asked in another form, but searching for the $ sign does not yield any results here.
I have already made a big system, and used jQuery extensively, referencing it with the $. At this point, I don't want to go back.
My problem is that now I have implemented CKEditor, which also references itself with the $, like many other JavaScript frameworks. So now I get a conflict and lots of:
Uncaught TypeError: cannot get property 'any_function' of undefined
I don't want to go through the CKEditor code, searching and replacing, since I will be updating in the future. I also want to keep using $ for jQuery, but nothing else.
Off course I cannot simply use:
$.noConflict()
Without breaking my scripts.
Is there a way where I can keep using $ for jQuery whenever I want, while letting my JavaScript frameworks use $ internally?
What is my best/easiest solution here?
You can wrap either sets of your code in an IIFE and pass the relevant object to it.
(function($) {
// Code that uses jQuery
})(jQuery);
I'd also suggest assigning CKEditor to something else right after it's been loaded so that you can follow a similar pattern for CKEditor code.
// Right after loading CKEditor
var CKEditor = $;
// Code that uses CKEditor
(function($) {
...
})(CKEditor);
Although it'd be more sustainable to just reassign CKEditor to another variable and only use that variable.
I am working on a widget that is embedded on a customers website, it loads a jquery file. however we need to detect if jquery is already loaded on a customers page to avoid conflicts and then not load our own jquery.
As a sidenote the widget works on all versions of jquery. The code being used is...
if (typeof jQuery == 'undefined') {
console.log("NOT LOADED");
scripts.push("https://d33f10u0pfpplc.cloudfront.net/perun/v1/js/widget/betaV2/jquery-1.8.2-min.js");
}
This works when tested locally, however when it was rolled out on some sites we got a ...
type error $tabs(...) is not a function
it seems that the jquery on the host sites must not have been fully loaded is my initial theory (could be wrong)
is there a way to improve the jquery detection used above? or if you know why it is not working i am happy to learn. thanks
First of all, $tabs is not a standard jQuery function. If it's part of a plugin, you need to make sure that's included as well.
Also make sure that jQuery isn't being run in noConflicts mode. In that case, jQuery may be defined, but not $.
Do you check the loading state of the browser? Javascript is typically executed at the time, when the browser is parsing it. Jquery is a bigger file and sometimes it will execute upcoming code first.
To solve it, verify that your own code is executed after dom is loaded:
$(function() {
// your code here
});
Alternative 2 is to check what
scripts.push()
exactly does. It needs to be asynchronous, just only add the file request does not ensure the file is loaded and parsed. Maybe this is your problem.
Using jQuery in widgets isn't optimal. Is it possible to write it in native js?
It's probably not help, but in example at http://www.initializr.com/
jQuery checked like
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
<script>window.jQuery || document.write('<script src="js/vendor/jquery-1.10.1.min.js"><\/script>')</script>
Please check your jquery version and your version not have a $tabs jquery function.
Then only you got this type error
$tabs(...) is not a function.
Otherwise try new version of jquery_ui file.
I am in the process of installing the asset pipeline into an older rails app. I am getting some really strange results though. I can see that the page is rendering all of the css and the jquery that is in the app/assets directory but its having a hard time interacting with the html.
For instance if i inspect the page and in the console call $("html").html(); to try grab all the html it returns TypeError: Cannot call method 'html' of null same when trying to grab any element that is being rendered? but the page is there. if i call jQuery it will return fine. so its not like it jQuery isnt there.
$ is just a shorthand way of writing jQuery. If the latter works but the former doesn't, then another script in your pipeline is probably conflicting with jQuery and trying to use the $ symbol for something else.
Are you using any other plugins or libraries that might be trying to use $? Or have you accidentally overwritten it yourself by writing $ = (something) anywhere? Without more information it's hard to know where the problem is exactly.
If all else fails you can just stick to using jQuery() for all your calls. In your external script file you could also circumvent this by passing the jQuery object to a wrapper function, e.g.:
(function ($) {
$('div').append('You can use $ here without having to worry about conflict.');
}(jQuery))
Was having trouble a few weeks ago getting jquery to run in firebug (esp on drupal sites). Apparently the issue was that Drupal was grabbing the $ variable, so I got a little namespace snippet (function($)...(Jquery)); that reclaimed the $. I have been using the namespace in firebug but geting inconsistent results, especially when mixing pure javascript and Jquery within the namespace. I understand that all Jquery is javascript and they work together, but looking at samples I see some weird variations in the way people deploy this namespace. As a general question but also specifically within Firebug context, is there any need to place javascript in any particular relation to namespaced Jquery (inside the namespace, function calls inside, function out, or any other convention)?
Thanks
If you meant preventing the $ from being reclaimed, there is no convention but there is a way. other frameworks also use the $ name. anything declared later to use $ will take over $. however, you can prevent it or get around it.
jQuery offers a lot of ways to prevent it via its noConflict() method. but my preferred method is just wrap them in a function. jQuery also uses the jQuery namespace. $ is a shorthand alias, a very common one too. so functions like $.each() is also jQuery.each(). what crazy framework uses jQuery as its namespace anyway?
an example of wrapping in a function is like this:
(function($){
//inside here, "$" is jQuery
}(jQuery)); //pass "jQuery"
I have 2 js on a single page. In one of the js I am doing var jQuery = $.noConflict(true); and after that using all the jQuery methods using jQuery object, like jQuery("#div").hide();
In another js, I am using the traditional $ variable & accessing the jQuery methods as $("#div").hide();
When on a page I use either of the 2 js', things work fine. However, when I include both, the $ in the second js seems to be overwritten by jQuery. for example, in js 2 I can no longer do $("#div").hide() but if I use jQuery instead of $, it works fine - jQuery("#div").hide();!
Why am I experimenting this is because the first div will be distributed to different websites as a plugin, and the second js could be the Jquery written by that website developer.
Please help me figure out where am I going wrong..
Thanks.
You're using noConflict, which releases jQuery's hold on $. Doesn't matter if it's in separate scripts, since it's the same global environment.
In the script where you want to use $, define that variable inside your .ready() handler.
jQuery(function($) {
$('foo').bar();
});
The easiest way to solve this is to use a pattern that plugin authors employ.
(function($) {
// Use $ safely within the function
})(jQuery); // Passes in jQuery object
This is function is created and invoked immediately, and at the same time allows you to pass a variable into the scope of the function. Using this, you can carry on referring to $ in your code and not worry about overwriting it or conflicting.
The jQuery documentation advises this pattern
Files do not have scope, you dereferenced $ with noConflict for your entire page. Anything