$ is not a function - jQuery error
JavascriptJqueryJavascript Problem Overview
I have the jQuery loaded fine, I've quadruple-checked, though I'm getting this error in FireBug "$ is not a function" and my code doesn't work.
Here's my code:
<script type="text/javascript">
$("ol li:nth-child(1)").addClass('olli1');
$("ol li:nth-child(2)").addClass("olli2");
$("ol li:nth-child(3)").addClass("olli3");
$("ol li:nth-child(4)").addClass("olli4");
$("ol li:nth-child(5)").addClass("olli5");
$("ol li:nth-child(6)").addClass("olli6");
$("ol li:nth-child(7)").addClass("olli7");
$("ol li:nth-child(8)").addClass("olli8");
$("ol li:nth-child(9)").addClass("olli9");
$("ol li:nth-child(10)").addClass("olli10");
$("ol li:nth-child(11)").addClass("olli11");
$("ol li:nth-child(12)").addClass("olli12");
$("ol li:nth-child(13)").addClass("olli13");
$("ol li:nth-child(14)").addClass("olli14");
$("ol li:nth-child(15)").addClass("olli15");
$("ol li:nth-child(16)").addClass("olli16");
$("ol li:nth-child(17)").addClass("olli17");
$("ol li:nth-child(18)").addClass("olli18");
$("ol li:nth-child(19)").addClass("olli19");
$("ol li:nth-child(20)").addClass("olli20");
</script>
Javascript Solutions
Solution 1 - Javascript
In Wordpress jQuery.noConflict()
is called on the jQuery file it includes (scroll to the bottom of the file it's including for jQuery to see this), which means $
doesn't work, but jQuery
does, so your code should look like this:
<script type="text/javascript">
jQuery(function($) {
for(var i=0; i <= 20; i++)
$("ol li:nth-child(" + i + ")").addClass('olli' + i);
});
</script>
Solution 2 - Javascript
It's really hard to tell, but one of the 9001 ads on the page may be clobbering the $
object.
jQuery provides the global jQuery
object (which is present on your page). You can do the following to "get" $
back:
jQuery(document).ready(function ($) {
// Your code here
});
If you think you're having jQuery problems, please use the debug (non-production) versions of the library.
Also, it's probably not best to be editing a live site like that ...
Solution 3 - Javascript
There are quite lots of answer based on situation.
-
Try to replace '$' with "jQuery"
-
Check that code you are executed are always below the main jquery script.
-
Pass $ into the function and add "jQuery" as a main function like below.
Solution 4 - Javascript
<script type="text/javascript">
$("ol li:nth-child(1)").addClass('olli1');
$("ol li:nth-child(2)").addClass("olli2");
$("ol li:nth-child(3)").addClass("olli3");
$("ol li:nth-child(4)").addClass("olli4");
$("ol li:nth-child(5)").addClass("olli5");
$("ol li:nth-child(6)").addClass("olli6");
$("ol li:nth-child(7)").addClass("olli7");
$("ol li:nth-child(8)").addClass("olli8");
$("ol li:nth-child(9)").addClass("olli9");
$("ol li:nth-child(10)").addClass("olli10");
$("ol li:nth-child(11)").addClass("olli11");
$("ol li:nth-child(12)").addClass("olli12");
$("ol li:nth-child(13)").addClass("olli13");
$("ol li:nth-child(14)").addClass("olli14");
$("ol li:nth-child(15)").addClass("olli15");
$("ol li:nth-child(16)").addClass("olli16");
$("ol li:nth-child(17)").addClass("olli17");
$("ol li:nth-child(18)").addClass("olli18");
$("ol li:nth-child(19)").addClass("olli19");
$("ol li:nth-child(20)").addClass("olli20");
</script>
change this to
<script type="text/javascript">
jQuery(document).ready(function ($) {
$("ol li:nth-child(1)").addClass('olli1');
$("ol li:nth-child(2)").addClass("olli2");
$("ol li:nth-child(3)").addClass("olli3");
$("ol li:nth-child(4)").addClass("olli4");
$("ol li:nth-child(5)").addClass("olli5");
$("ol li:nth-child(6)").addClass("olli6");
$("ol li:nth-child(7)").addClass("olli7");
$("ol li:nth-child(8)").addClass("olli8");
$("ol li:nth-child(9)").addClass("olli9");
$("ol li:nth-child(10)").addClass("olli10");
$("ol li:nth-child(11)").addClass("olli11");
$("ol li:nth-child(12)").addClass("olli12");
$("ol li:nth-child(13)").addClass("olli13");
$("ol li:nth-child(14)").addClass("olli14");
$("ol li:nth-child(15)").addClass("olli15");
$("ol li:nth-child(16)").addClass("olli16");
$("ol li:nth-child(17)").addClass("olli17");
$("ol li:nth-child(18)").addClass("olli18");
$("ol li:nth-child(19)").addClass("olli19");
$("ol li:nth-child(20)").addClass("olli20");
});
</script>
Solution 5 - Javascript
In my case I was using jquery on my typescript file:
import * as $ from "jquery";
But this line gives me back an Object $
and it does not allow to use as a function (I can not use $('my-selector')
). It solves my problem this lines, I hope it could help anyone else:
import * as JQuery from "jquery";
const $ = JQuery.default;
Solution 6 - Javascript
As RPM1984 refers to, this is mostly likely caused by the fact that your script is loading before jQuery is loaded.
Solution 7 - Javascript
That error kicks in when you have forgot to include the jQuery library in your page or there is conflict between libraries - for example you be using any other javascript library on your page.
Take a look at this for more info:
Solution 8 - Javascript
When jQuery is not present you get $ is undefined
and not your message.
Did you check if you don't have a variable called $ somewhere before your code?
Inspect the value of $ in firebug to see what it is.
Slightly out of the question, but I can't resist to write a shorter code to your class assignment:
var i = 1;
$("ol li").each(function(){
$(this).addClass('olli' + i++);
});
Solution 9 - Javascript
I believe using $ alone is now deprecated in the new version of jQuery. Use below syntax instead:
jQuery(function($) {
//magic here
})
Solution 10 - Javascript
Use jQuery for $. I tried and work.
Solution 11 - Javascript
There are two possible reasons for that error:
-
your jquery script file referencing is not valid
-
try to put your jquery code in document.ready, like this:
$(document).ready(function(){
....your code....
});
cheers