WordPress how to use jquery and $ sign

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I have a simple jQuery script in a WordPress plugin that is using a jQuery wrapper like this: 

$(document).ready(function(){

    // jQuery code is in here

});

I am calling this script from within the WordPress Dashboard and am loading it AFTER the jQuery framework has loaded.

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When I check the page in Firebug I constantly keep receiving the error message:

TypeError: $ is not a function

$(document).ready(function(){

Should I maybe wrap the script in this function: 

(function($){

    // jQuery code is in here

})(jQuery);

I have had this error quite a few times and am not sure how to handle it.

Any help would be greatly appreciated.

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17 comments

  1. By default when you enqueue jQuery in WordPress you must use jQuery, and $ is not used (this is for compatibility with other libraries).

    Your solution of wrapping it in function will work fine, or you can load jQuery some other way (but that’s probably not a good idea in WordPress).

    If you must use document.ready, you can actually pass $ into the function call:

    jQuery(function ($) { ...

  2. This should fix it:

    jQuery(document).ready(function($){
  //you can now use $ as your jQuery object.
  var body = $( 'body' );
});

    Put simply, WordPress runs their own scripting before you can and they release the $ var so it won’t collide with other libraries. This makes total sense, as WordPress is used for all kinds of web sites, apps, and of course, blogs.

    From their documentation:

    The jQuery library included with WordPress is set to the noConflict()
    mode (see wp-includes/js/jquery/jquery.js). This is to prevent
    compatibility problems with other JavaScript libraries that WordPress
    can link.

    In the noConflict() mode, the global $ shortcut for jQuery is not
    available…

  5. You can avoid confliction like this 

    var jq=jQuery.noConflict();
jq(document).ready(function(){  
  alert("Hi this will not conflict now");
  jq('selector').show();
});

  6. Try this:

    <script language="JavaScript" type="text/javascript" src="jquery/jquery.js"></script>
<script>
    jQuery.noConflict();
    (function ($) {
        function readyFn() {
            // Set your code here!!
        }

        $(document).ready(readyFn); 
    })(jQuery);

</script>

  7. Also, I find the good solution for use jQuery noConflict mode.

    (function($){

  $(document).ready(function(){
      // write code here
  });

  // or also you can write jquery code like this

  jQuery(document).ready(function(){
      // write code here
  });

})(jQuery);

    I found this solution from here TryVary.com.

  10. Double check your jQuery references. It is possible that you are either referencing it more than once or you are calling your function too early (before jQuery is defined). You can try as mentioned in my comments and put any jQuery reference at the top of your file (in the head) and see if that helps.

    If you use the encapsulation of jQuery it shouldn’t help in this case. Please try it because I think it is prettier and more obvious, but if jQuery is not defined you will get the same errors.

    In the end… jQuery is not currently defined.

  11. Use

    jQuery(document).

    instead of

    $(document).

    or

    Within the function, $ points to jQuery as you would expect

    (function ($) {
   $(document).
}(jQuery));

  13. What worked for me. The first library to import is the query library and right then call the jQuery.noConflict() method. 

    <head>
 <script type="text/javascript" src="jquery.min.js"/>
 <script>
  var jq = jQuery.noConflict();
  jq(document).ready(function(){
  //.... your code here
    });
 </script>

  14. <script>
var jq=jQuery.noConflict();
(function ($) 
    {
    function nameoffunction()
    {
        // Set your code here!!
    }

    $(document).ready(readyFn); 
    })(jQuery);

    now use jq in place of jQuery

  15. You come across this issue when your function name and one of the id names in the file are same. just make sure all your id names in the file are unique.

  17. wp_enqueue_script( string $handle, string $src = '', string[] $deps = array(), string|bool|null $ver = false, bool $in_footer = false )

    If you are using jquery for frontend, you can achieve it by passing $deps as jquery