Calling JavaScript function from String

Matthew Holloway says:

How do you send parameters that aren’t strings to the function though? Lets say you’ve got FunctionNameString and Object … how would you call FunctionNameString(Object) ?

JS says:

What I found easier is:

// convert string to a function reference (if it exists)
fun = eval(strFun);
// call it
fun(param1, param2);

This worked in IE6 and FF3.5 so I guess it works in others too.
Using this method enables me to use objects as parameters.

Akshat Maheshwari says:

It helped me a lot…….
Thanxs.. :)

Horoskop Skorpion says:

Good info

GenysLt says:

Thank You

anna says:

thx=) help me a lot ;)

teal says:

You should understand that using of ‘eval’ is not good enough practice. Happily all js functions are stored in huge ‘window’ object (if you use js inside browser, of course).
So you can get direct pointer to your function by calling
window[‘here_is_your_function_name_in_string’];
Or you can even test if this function exists:
window.hasOwnProperty(‘here_is_your_function_name_in_string’);

Ok, complete sample is:
var s = “my_function”;
if (window.hasOwnProperty(s)) window[s](params);

jonas says:

Great!! Been looking desperately for this functionality!!!

jey says:

javascript eval() function

name0,name1,name3 are javascript variables.
jline0,jline1,jline2 are javascript arrays

str=”{name : name0,data : jline0},{name : name1,data : jline1},{name : name2,data : jline2 }”;
var ff=eval(str);

document.ready(
.
.

series :[ff]
.
.
});

I can’t pass ff value in series parameter. Please anyone help me. .

ssam says:

eval is bad, this is the worst way of executing a function.

Monkey says:

Also, it is not well interpreted in a “jQuery object” environnement:

var myjQueryObject = function()
{
 function oglop(arg)
 {
   alert(arg);
 }

 function init()
 {
   window['oglop']('gwok gwok!');
 }

 return {init: init, oglop: oglop};
}();

This won’t work until you create the function outside the myjQueryObject class.

Spanich says:

I was expecting fn to be executed under window object, so that context for the function will be window, but not the current object.
So, I need not a “call”, but “apply” method like in the following post:
http://odetocode.com/blogs/scott/archive/2007/07/05/function-apply-and-function-call-in-javascript.aspx

arun says:

function oglop(arg)
{
———–Here I need call code behind function ———————
is it possible
}

Amit says:

function oglop(arg)

{
———–Here I need call code behind function ———————
is it possible
};

Hitesh says:

jquery multi combobox selected first elements in display after remove option

roemly says:

thank u very much ^_^

Rahul Jawale says:

Thanks man. You are a savior!!! :)

hooom says:

eval is bad idea if you care security

rajesh says:

thanks a lot it helped so much

syam says:

It’s working good it helped a lot

Peter Drinnan says:

If you’re using jQuery you can try using isFunction.

Here is an example:

function sayhi() {
    alert(‘hi there’);
    }

    var funcCall= “sayhi”;

    if($.isFunction(funcCall)) {
    eval(funcCall);
    }

kamayani says:

very useful

anonymous says:

Thank God Someone has finally given me the information I needed in a way that I can understand. Other forums had parts of the code but not the complete coding which was confusing. Thanks a lot mate

SteeveC says:

Nice, thx you, i was looking for this solution since long time.
Thx you very much

kv1dr says:

It works :D

LaurentM says:

It works very well :-) Thanks !

vrushali says:

GUD Thanks

sreddy says:

Thanks. You saved my day

jigish says:

nice one

Shilpa says:

Hi ,
I need to dynamically inject value with out the use of eval.

eval(“document.getElementByID(‘field_name’).checked”) = returns true if the field_name is checked else false.

I now have to replace eval with some thing which will do the same operation.

Can any one please help me !!

Thanks,
Shilpa