How to debug JavaScript with Firebug?

Question

I cannot seem to debug my JavaScript code with Firebug. The play button is greyed out. I use FireFox 3.0.4 and Firebug 1.2.1.

Are there any known issues?

This is the script I want to debug:

(breakpoints set on <img onclick> and function say()), the code executes well.

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
        <script type="text/javascript" src="jquery/jquery-1.2.6"></script>
        <script type="text/javascript">
            function say(text){
                alert(text);
            }
        </script>
        <title>DOM Level 0 Event Handlers</title>
    </head>
    <body>
        <img onclick="say('Vroom vroom');" id="vstar" src="vstar.jpg" alt="vstar" />
        <div id="console"></div>
    </body>
</html>

Ive never found a way to debug JS code thats embedded within a non .js file (JSP, HTML, etc.), so I`d be very keen to hear any solution to this problem — Dónal
– Dónal, Commented Nov 23, 2008 at 7:15

user21582 · Accepted Answer · 2008-11-23 08:16:47Z

3

Check if you have "support for script debugging" enabled in Console. Its disabled by default for performance reasons.

answered Nov 23, 2008 at 8:16

user21582

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Comments

acrosman · Accepted Answer · 2008-11-23 07:07:00Z

0

I usually see this behavior if I forget to set a break point, or I have set the break points in places that don't get executed (so execution never stops, so the play button would never do anything).

answered Nov 23, 2008 at 7:07

acrosman

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1 Comment

eddy147 Over a year ago

Even a simple alert('Hallo'), whisch is executed, and breakpoint set, the buttons are greyed out and no debugging

bander · Accepted Answer · 2009-01-20 20:52:09Z

0

You need to close all instances of firefox and reopen. Firefox has shared memory, so you cannot open a new page.

answered Jan 20, 2009 at 20:52

bander

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