Converting javascript string to object method and calling it?

Question

I've come across some code which allows you to convert a string of a function name to a function and use it:

var strFun = "someFunction";
var strParam = "this is the parameter";

//Create the function
var fn = window[strFun];

//Call the function
fn(strParam);

I was wondering if there was a way to do the same for object methods, e.g.:

var fn = window["onclick"];
var body = document.body;
body.onclick = function() {
    alert('yo');
}
// This won't work [Uncaught TypeError: Object #<HTMLBodyElement> has no method 'fn']
body.fn(); // expecting body.onclick(); via substitution of fn with a onclick function

@Derek: your code still doesn't make sense. You're creating one thing, and calling another. — Sergio Tulentsev
– Sergio Tulentsev, Commented Apr 5, 2012 at 3:14
Once again, if you want to attach click handlers, you don't need all that. Use addEventListener. — Sergio Tulentsev
– Sergio Tulentsev, Commented Apr 5, 2012 at 3:15
I'm going after the abstract meaning of the code so body.fn() == body.onclick() — Derek
– Derek, Commented Apr 5, 2012 at 3:19

Paul · Accepted Answer · 2012-04-05 03:15:05Z

2

I think you're looking for:

var body = document.body;
body.onclick = function() {
    alert('yo');
}

var strfun = 'onclick';
var fn = body[strfun];
fn();

To call the onclick function of the body.

answered Apr 5, 2012 at 3:15

Paul

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DrStrangeLove · Accepted Answer · 2012-04-05 03:08:34Z

0

You can just call the function in the context of your object:

fn.call(your object);

answered Apr 5, 2012 at 3:08

DrStrangeLove

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