I have read this: Uncaught ReferenceError: jQuery is not defined
Which led me to this: Uncaught ReferenceError: $ is not defined?
After understanding the problem that I was not referencing jQuery before I was using it I changed my code.
From this:
<head>
<link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css" rel="stylesheet" />
<script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
</head>
I moved jQuery to the top like this:
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css" rel="stylesheet" />
<script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js"></script>
</head>
That fixed my first Uncaught ReferenceError. I am however still getting the same error but from select2.
Uncaught ReferenceError: jQuery is not defined
<anonymous> https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js:2
<anonymous> https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js:2
select2.min.js:2:83
I do not know how to reference it any sooner and ever their own page shows how to setup the code.
It turns out I tried to use select2 in my base.html file. I never referenced jQuary there.
base.html before:
<link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css" rel="stylesheet" />
<script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js"></script>
And after:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css" rel="stylesheet" />
<script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js"></script>
Small mistake that will hopefully save you 30 minutes of work. Check everything.