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POHow do I get Firefox debugger watch's target element?
 

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  1. POHow do I get Firefox debugger watch's target element?
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    <p>I've been trying to add the highlighting feature to the Firefox DevTools debugger, so it will highlight the element instead of only showing [HTMLAnchorElement] or similar. I know it's possible, since you can set <code>someElement.style.border='1px solid blue'</code> or similar as a watch, and it hightlights the element. So why not let it store current border, and show it on mouseover using <code>element.style.border='1px solid blue'</code>, and restore it on mouseout? <img src="https://i.stack.imgur.com/HBE4t.png" alt="Cannot inspect where the document of these elements in the watch expressions are."></p> <p>While debugging in Firefox devtools, I noticed the element in the right watch panel has rows with the variable names, which are actually given odd ids like "46439", under parent element with "document.getelementsbytagname('a')36" id. What do these ids signify? Can they map a display element to its target element in the page? I tried <code>window.DebuggerView.WatchExpressions.getItemForElement</code> from Venkman but it returns null. Is there another function from <a href="https://hg.mozilla.org/mozilla-central/file/34a9d08a82c4/browser/devtools/debugger/debugger-panes.js" rel="nofollow noreferrer">this source file</a> that will give the target element of debugger watch?</p> <p>Ideally, I should be able to 'watch' items such as <code>document.getElementsByTagName('a')</code>, or local variable in the debug context, and highlight the items in the page like Chromium/Firebug. Yet I'm not sure how to add this feature from a Firefox extension.</p> <p><strong>Update</strong>:</p> <p>After further work, it would seem to be possible to use the <code>DebuggerView.StackFrames.evaluate</code> to run code while stopped at a breakpoint, like what <code>chrome://browser/content/devtools/debugger-controller.js</code> is doing with watches. Unfortunately when stopped at a breakpoint I run this code, and <code>DebuggerView.StackFrames.evaluate</code> is <code>[void] void</code> in Venkman. Is this evaluate command hidden or private somehow, or not initialized?</p>
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    1. COHave you checked the development tools in Firefox 25 (Firefox Nightly), this might contain the stuff you want. I also highly recommend you to use FireBug because it has a lot of usefull features, also the one you're searching for.
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    2. CO@TimVisee Thanks, but I couldn't even get as far as adding a watch like in the screenshot above, in Nightly. Are you saying the highlighter api in robcee's answer is available, or soon to be available in 25?
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    3. CO@TimVisee Where is that feature in the soon-to-be-released Firefox 25?
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