Question

I am using bookmarklet to inject a element in document with a custom JS script file. I did it like this:

var newscript = document.createElement('script');
newscript.type = 'text/javascript';
newscript.async = true;
newscript.src = 'http://www.myurl.com/my_js_script.js';
var oldscript = document.getElementsByTagName('script')[0];
oldscript.parentNode.insertBefore(newscript, oldscript);

But I can’t figure out how to actually execute it. Can someone tell me how can I execute that JS file?

Note: Since this can be a Greasemonkey script as well, I am tagging this question for Greasemonkey as well.

Answer 1

Script tags are automatically downloaded and executed when they’re added to the document. Note, however, that the script you’re using may fail if the document you’re injecting into doesn’t already contain any <script> tags, as oldscript will be undefined.