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Asked: 2026-06-16T04:21:50+00:00

I have the following (simplified) code: <!DOCTYPE html SYSTEM http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd> <html xmlns=http://www.w3.org/1999/xhtml> <head> <title>Test</title>

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I have the following (simplified) code:

<!DOCTYPE html SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>Test</title>

        <script type="text/javascript" src="http://code.jquery.com/jquery-latest.js" />

        <script language="javascript" type="text/javascript">
            function testFunction() {
                alert('It works');
            }
        </script>
    </head>
    <body>
        <form method="post" action="test.html" onsubmit="testFunction()">
            <input type="submit" value="Test" />
        </form>
    </body>
</html>

My testFunction() function works fine by it self, that is until I import jQuery with the line

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js" />

Now it fails and tells me that
Uncaught ReferenceError: testFunction is not defined

I am hoping this is a newbie mistake and that I am missing something obvious. Notice that I haven’t even try to use jQuery yet.

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1 Answer

  1. Editorial Team

    You need to close the <script> tag fully.

    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>

    Works great on jsfiddle after changing:
    http://jsfiddle.net/PVYM9/

    Also, in HTML5 you can shorten the doctype to just <!DOCTYPE html>, and you don’t need to define type properties for your <script> tags. See jsfiddle for example.

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