TypeError: 'undefined' is not a function (evaluating '$(document)')

Question

- I'm using a WordPress site. - I'm including this script in the header. When the script loads, I get this error: TypeError: 'undefined' is not a function (evaluating '$(document)') I have no idea what is causing it or what it even means. In firebug, I get this: $ is not a function

Accepted Answer

Wordpress uses jQuery in noConflict mode by default. You need to reference it using `jQuery` as the variable name, not `$`, e.g. use

```
jQuery(document);
```

instead of

```
$(document);
```

You can easily wrap this up in a self executing function so that `$` refers to jQuery again (and avoids polluting the global namespace as well), e.g.

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

TypeError: 'undefined' is not a function (evaluating '$(document)')

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