This link (archived version) describes how to inject code from a script into an iframe:
function injectJS() {
var iFrameHead = window.frames["myiframe"].document.getElementsByTagName("head")[0];
var myscript = document.createElement('script');
myscript.type = 'text/javascript';
myscript.src = 'myscript.js'; // replace this with your SCRIPT
iFrameHead.appendChild(myscript);
}
That's ok, but what if I want to insert a function object into an iframe and get it executed in the iframe context? Let's say I have:
function foo () {
console.log ("Look at me, executed inside an iframe!", window);
}
and I want to insert foo's code inside an iframe? (function foo could be something loaded dynamically, I can't just wrap it in quotes)
I naively tried:
var scriptFooString = "<script>" + foo.toString() + "</script>"
to get the code inside function, but
- I don't know how to insert it in the iframe HEAD (maybe with jquery?)
- I don't know if it's the right way
- I don't know what happens when if function is way more complex than that
- I don't know what happens with double and single quotes in
scriptFooString
Any hint?