How to execute a JavaScript function when I send its name as string dynamically without parameters

Question

I want execute JavaScript function which the name is coming as a string dynamically. I don't need to pass any parameters while executing the function.

Please can any one guide me how to achieve this?

• user1046334: eval is evil, try to avoid it at all costs
• dku.rajkumar: Check this threads stackoverflow.com/questions/676721/… and stackoverflow.com/questions/5618007/…

Answer 1

one simple way

eval("SomeFunction()");

or

var funcName = "SomeFunction";
var func == window[funcName];
func();

Answer 2

dangerous but you could use eval(method_name+"()")

Answer 3

are you talking about ́eval() ́??

var foo = "alert('bar')";
eval(foo);

Hope this helps;

Answer 4

function a() { 
 console.log('yeah!'); 
}
var funcName = 'a'; // get function name
this[funcName]();

Answer 5

If the function is global, you should do window[funcName]() in browser.

• user1046334: You chould check if it exists with if ("function" === typeof window[funcName])
• kamesh: window[funcName]() it is working in Firefox but not working in IE8 Iam getting error in IE8 is expected identifier

Answer 6

Using eval is the worst way imaginable. Avoid that at all costs.

You can use window[functionname]() like this:

function myfunction() {
 alert('test');
}
var functionname = 'myfunction';
window[functionname]();

This way you can optionally add arguments as well

Answer 7

Perhaps a safer way is to do something like this (pseudo code only here):

function executer(functionName)
{
 if (functionName === "blammo")
 {
 blammo();
 }
 else if (functionName === "kapow")
 {
 kapow();
 }
 else // unrecognized function name
 {
 // do something.
 }

You might use a switch statement for this (it seems like a better construct):

switch (functionName)
{
 case "blammo":
 blammo();
 break;
 case "kapow":
 kapow();
 break;
 default:
 // unrecognized function name.
}

You can optimize this by creating an array of function names, searching the array for the desired function name, then executing the value in the array.