Inject javascript into a javascript function

Question

I\'ve got a weird question in that I need to inject some javascript into another javascript function. I am using a framework which is locked so I can not change the existing fun

Answer 1

Functions are first class values in Javascript, which means that you can store them in variables (and in fact, declaring a named function is essentially assigning an anonymous function to a variable).

You should be able to do something like this:

function doSomething() { ... }

var oldVersionOfFunc = doSomething;
doSomething = function() {

    var retVal = oldVersionOfFunc.apply(oldVersionOfFunc, args);

    // your added code here

    return retVal;
}

(But, I could be wrong. My javascript's a little rusty. ;))