To access and use a variable or function dinamically, with Name from a String in JavaScript, just use the window object, with this syntax:


// For function
Here is some examples, see the explanations in code.

Using variable with name stored into a string

var vr_name = 'vr1'; // string with name of a variable

var vr1 = '';

// uses variable with name stored as string in vr_name
// window[vr_name] /window['vr1'] is the value of vr1
var site = 'http://'+ window[vr_name];

// Test
document.write(site); //

Using variable dinamically, with name stored into a string in object

// object with strings with variable names
var vr_name = {'v1':'vr1', 'v2':'vr2'};
var vr1 = '';
var vr2 = '';

// uses variable dinamically, with name stored as string in vr_name
var i = 2;
var site = 'https://'+ window[vr_name['v'+ i]];

// Test
document.write(site); //

Calling function with name stored into a string

function f1(a, b) {
 return a + b;

var f_name = 'f1'; // string with function name

// uses function with name stored as string in f_name
// window[f_name](parameters) calls the f1(parameters)
var sum = window[f_name](12, 23);

// Test
document.write(sum); // 35

Calling object method with name stored in string into an object

- Use: object['method_name'](parameters).
// object with strings with method names
var methods = {'m1':'hi1', 'm2':'hi2'};

// object with two methods
var obj = {
 'hi1': function(name) {
 return 'Hello dear '+ name;
 'hi2': function(name) {
 return 'Hola '+ name;

// uses object method with name stored as string in methods
var hi = obj[methods['m1']]('ME');

// Test
document.write(hi); // Hello dear ME

Daily Test with Code Example

Which tag adds an image in web page?
<div> <img> <span>
<img src="" width="191" height="63" alt="Courses-Web" />
Which of these CSS codes displays the text oblique?
font-style: italic; text-decoration: underline; font-weight: 500;
#id {
  font-style: italic;
Click on the jQuery function used to hide with animation a HTML element.
click() hide() show()
$(document).ready(function() {
  $(".a_class").click(function(){ $(this).hide("slow"); });
Click on the correctly defined function in PHP.
fname function() {} function fname() {} function $fname() {};
function fname($a, $b) {
  echo $a * $b;
Using Variable and Function with Name from String in JavaScript

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