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I am getting this error that says jQuery is not defined. I want to use twitter bootstrap and jQuery-UI. In my <head> I've added the CSS and JS necessary. I noticed that the jQuery-UI page uses 1.9.1 jQuery and the latest version is 1.10.2. So I'm assuming there is some sort of conflict going on. Twitter bootstrap requires jQuery so that might be causing the error. Or perhaps I am doing something wrong.
Head:
<head>
<meta charset="utf-8" />
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" />
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap-theme.min.css" />
<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
</head>
Error:
Uncaught ReferenceError: jQuery is not defined bootstrap.min.js:6
(anonymous function) bootstrap.min.js:6
220
jQuery is not defined” is a common WordPress error that occurs when a website calls for a jQuery function before the library properly loads. Possible causes include conflicting plugins, a corrupted jQuery file, a blocked CDN, or your JavaScript code loads incorrectly.”
A not defined error is when we did not declare the variable and tried to call that variable. In JavaScript, we can declare variables without adding const , let , or var , and we won't get an error of undefined or not defined . This can be seen in the code below.
not defined: In JavaScript, it is one of the reference errors that JavaScript will throw when someone accesses the variable which is not inside the memory heap.
Load jQuery before everything else!
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" />
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap-theme.min.css" />
<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
This is most likely because of 2 reasons:
What you need to do is:
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" />
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap-theme.min.css" />
<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js" />
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js" />
<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js" />
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