Javascript dynamically invoke object method from string

Question

Can I dynamically call an object method having the method name as a string? I would imagine it like this:

var FooClass = function() {
    this.smile = function() {};
}

var method = "smile";
var foo = new FooClass();

// I want to run smile on the foo instance.
foo.{mysterious code}(); // being executed as foo.smile();

Karoly Horvath · Accepted Answer · 2012-03-24 19:55:15Z

up vote 9 down vote accepted

if the name of the property is stored in a variable, use []

foo[method]();

answered Mar 24 '12 at 19:55

Karoly Horvath
34.6k11959

Thanks guys, that was so easy I totally overlooked it. Was already searching for some magical functions and tricks. – Mikulas Dite Mar 24 '12 at 20:13

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Didier Ghys · Answer 2 · 2012-03-24 19:55:47Z

up vote 3 down vote

Properties of objects can be accessed through the array notation:

var method = "smile";
foo[method](); // will execute the method "smile"

answered Mar 24 '12 at 19:55

Didier Ghys
14.8k51938

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hakovala · Answer 3 · 2012-03-24 20:04:28Z

up vote 0 down vote

method can be call with eval eval("foo." + method + "()"); might not be very good way.

answered Mar 24 '12 at 20:04

hakovala
462

	stackoverflow.com/questions/197769/… – Karoly Horvath Mar 24 '12 at 20:25
	i had a nagging feeling there was something wrong with evil eval.. – hakovala Mar 24 '12 at 21:01

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Javascript dynamically invoke object method from string

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