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I'm doing quite a bit of work in the developer tools, and like to use jQuery in the console to run code snippets. To inject jQuery into the page (and the console), I'm pasting this into the devtools console:

var j = document.createElement('script'); j.src = "//ajax.googleapis/ajax/libs/jquery/2.1.1/jquery.min.js"; document.getElementsByTagName('head')[0].appendChild(j);

Is there a way to inject jQuery automatically into the developer tools console? Ideally, without affecting window.$ or window.jQuery for the current page.

I'm doing quite a bit of work in the developer tools, and like to use jQuery in the console to run code snippets. To inject jQuery into the page (and the console), I'm pasting this into the devtools console:

var j = document.createElement('script'); j.src = "//ajax.googleapis./ajax/libs/jquery/2.1.1/jquery.min.js"; document.getElementsByTagName('head')[0].appendChild(j);

Is there a way to inject jQuery automatically into the developer tools console? Ideally, without affecting window.$ or window.jQuery for the current page.

• javascript
• firefox
• firefox-developer-tools

Share Improve this question Follow edited Oct 27, 2017 at 14:24 Vadim Kotov 8,28488 gold badges5050 silver badges6363 bronze badges asked Oct 7, 2014 at 22:12 silverwindsilverwind 3,93611 gold badge3232 silver badges3838 bronze badges 5

• 1 Personally, I've been using a JS bookmarklet that will load it on click, but theoretically you could load it with a Greasemonkey script if you have the extension. Note that even when you use the code above it modifies window.$ and window.jQuery. $.noConflict() might help if you want to use window.$ for something else. – arcyqwerty Commented Oct 7, 2014 at 22:17
• Yeah, I thought about doing a greasemonkey script, but that will impact all page loading. I wonder if there's some hidden option in DevTools to just inject a script into the console, without it affecting the document. – silverwind Commented Oct 7, 2014 at 22:19
• Would definitely be interested in seeing that. If you're only working on certain pages/domains, you could always en/disable the script or modify the @include and @match as you'd like, but for many independent pages, that could be a hassle. – arcyqwerty Commented Oct 7, 2014 at 22:22
• Your question is a little hard to understand but I use injection of jQuery in Selenium tests, like this: jonausten.info/2014/06/23/… – djangofan Commented Oct 7, 2014 at 22:26
• Rephrased the question a bit. I'm not using Selenium, just the plain built-in console of the DevTools. – silverwind Commented Oct 7, 2014 at 22:30

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2 Answers 2

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The Developer Toolbar has an inject mand that will allow you to inject a script into the current page a bit more easily. It supports monly used libraries like jQuery and underscore. For more, see the docs I linked to.

If you wanted to always do this, you could create an add-on similar to dotjs - the main difference is that you would need to expose the jQuery object into the page's actual DOM, a content script isn't good enough. You should probably also always try to detect an existing jQuery? I'm not quite sure what you mean by 'without affecting window.$ or window.jQuery for the current page' - the current scope of the console by default is the current page. This is only different if you are debugging and are stopped at a breakpoint inside some other scope.

You can copy/paste the below code into the console and jQuery will be available to you in DevTools

var jq = document.createElement('script');
jq.src = "https://ajax.googleapis./ajax/libs/jquery/2.2.4/jquery.min.js";
document.getElementsByTagName('head')[0].appendChild(jq);

// ... You might need to also run
jQuery.noConflict();

You might immediately see an error: Uncaught ReferenceError: jQuery is not defined. Ignore it - DevTools is pulling your leg. (Google's weak attempt at humor, maybe...)

Then, in DevTools console, test it:
$('div').length; //press Enter

If you get an error, try it this way:
jQuery('div').length

Hopefully, the first will work - but sometimes you'll need to use the second method.

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