I'm trying to execute custom JS code from a Firefox extension using:
function executeJS(document, script) { var script = document.createElement('script'); script.setAttribute('type', 'text/javascript'); script.appendChild(document.createTextNode(script)); document.getElementsByTagName('head')[0].appendChild(script); }
The method call looks like:
executeJS(content.document, "$('#" + this.id + "').jixedbar({showOnTop:true});");
And this is the result that I get:
<script type="text/javascript"> [object XPCNativeWrapper [object HTMLScriptElement]] </script>
What's wrong with my code? What's the proper way of execution arbitrary JS script from Firefox extension?
I'm not sure about FF extensions, but in "normal" JS-land, there's no need for the createTextNode business. Outside of FF extensions, you can use Node.textContent ― though maybe it's different with the XPCNativeWrapper types.
script.textContent = 'var foo = 1; alert(foo);'
I think the main problem, however, is that you've also got a variable and a parameter both named script. Try this:
function executeJS(document, scriptContent) { var script = document.createElement('script'); script.appendChild(document.createTextNode(scriptContent)); document.head.appendChild(script); }
The type attribute really is not necessary, BTW.
I just came across this page, which looks like it could be what you're looking for:
const XUL = Namespace("xul", "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); function injectScript(name) { // Get the current filename let file = Components.stack.filename; // Strip off any prefixes added by the sub-script loader // and the trailing filename let directory = file.replace(/.* -> |[^\/]+$/g, ""); // Create the script node let script = document.createElementNS(XUL, "script"); script.setAttribute("type", "application/javascript;version=1.8"); script.setAttribute("src", directory + name); // Inject it into the top-level element of the document document.documentElement.appendChild(script); } // Inject the script injectScript("script.js");
