Javascript convert string into function name [duplicate]

Question

Possible Duplicate:
Call a JavaScript function name using a string?
javascript string to variable

I have this code:

var Functionify = function() {

    return {

        init: function(el, t) {
            var els = document.getElementsByClassName(el);
            var elsL = els.length;

            while(elsL--){
                //els[elsL].onclick = els[elsL].getAttribute(t);
                els[elsL].addEventListener('click', els[elsL].getAttribute(t), false);
            }
        }

    };

}();

Where el = 'myClassName' and t = 'data-id'

Now, 't' is a string, how can tell the addEventListener function to use 't' (a string) as a function name?

I think you mean to say that els[elsL].getAttribute(t) is a string and the name of a variable/function. Otherwise getAttribute(t) would not make sense. — Felix Kling
– Felix Kling, Commented Jul 30, 2012 at 23:45

dqhendricks · Accepted Answer · 2012-07-30 23:48:06Z

7

In the global namespace, you would do something like:

this.test = function() {
    alert('test');
}

window['test']();

The better option however would be to make your function a method of an object you create rather than of the global window object.

answered Jul 30, 2012 at 23:48

dqhendricks

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epascarello · Accepted Answer · 2012-07-30 23:44:02Z

1

I am not sure why you would do it, put if the function is part of the global scope you can use bracket notation.

window["stringName"]();

answered Jul 30, 2012 at 23:44

epascarello

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Joe Johnson · Accepted Answer · 2012-07-30 23:50:15Z

1

Using eval() is considered "evil", especially in the example given by Danila -- any piece of JS will / can be executed within an eval(). The best option as stated by epascarello, is to use square-bracket notation to invoke a named function. It should be noted, however, that windowt will invoke a function in the global namespace -- if the function is the method of an object, you should reference it as such.

answered Jul 30, 2012 at 23:50

Joe Johnson

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user1543051 · Accepted Answer · 2012-07-30 23:43:01Z

0

Use eval() function

Example:

a = "alert(1)"

eval(a)

answered Jul 30, 2012 at 23:43

user1543051

2 Comments

dqhendricks Over a year ago

this could potentially be dangerous.

Felix Kling Over a year ago

@dqhendricks: (I know you said "potentially", still...) Only if a is a string containing JavaScript, received from the server and injected by a malicious user. If you use your own code, it's perfectly fine, although not a very good solution.

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