Question

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How to execute a JavaScript function when I have its name as a string

I have this function

function myfunc() {
  alert('it worked!');
}

and this variable which is a string

var callback = 'myfunc';

How do I trigger the function from that string?

Answer 1

Assuming that the function is declared globally it will be contained in the window object so you can call it using window[callback]().

Globally declared functions are stored in the window object so you would be able to reference myfunc using window.myfunc. As with other properties on JavaScript objects you can use the brace syntax instead of the dot notation which would be window["myfunc"] since you have the string "myfunc" contained in your callback variable you can simply use that instead. Once you have the reference you call it as a function which gives window[callback]().