Enable and Disable Button using JavaScript

In this tutorial we will see how to Enable and Disable Button using JavaScript. HTML disabled Attribute and getElementById() Method are used for this purpose.

HTML Code

HTML Code is given below, This code contains three buttons. One is main button and other two buttons are used to Enable and Disable this button.

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Enable and Disable Button using JavaScript</title> 
</head>
<body>
<button onclick="alert('Hello!')" id='btn'>Main Button</button>
<button onclick="enable()">Disable</button>
<button onclick="disable()">Enable</button>
</body>
</html>

getElementById() Method

The getElementById() Method is used to select or target the HTML element with a specified value of Id attribute.

In this example the id of main button is 'btn', This id is used to target or select the main button.

The getElementById() Method is supported by all major browsers.

HTML disabled Attribute

The HTML disabled Attribute is used to disable or enable the html elements.

HTML disabled Attribute is a Boolean attribute. The disable attribute is set to true to disable the html element and it is set to false to enable the html element.

JavaScript Code

In this example getElementById method is used to select the main button. onclick event is used to trigger both enable() and disable() functions.

disabled attribute is set to true in one function which will disable our main button and it is set to false in other function which will enable our main button.

A disabled button won't function at all.

Take a look at the code given below.

<script>
function enable()
{    
document.getElementById("btn").disabled = true;
}

function disable()
{    
document.getElementById("btn").disabled = false;
}
</script>

Demo

Video Tutorial

Watch video tutorial on how to Enable and Disable Button using JavaScript.

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