Check UnCheck all Checkboxes with one Checkbox in JavaScript

In this tutorial we will see how to Check UnCheck all Checkboxes with one Checkbox in JavaScript. The JavaScript checked property is used for this which returns or sets the state of a checkbox.

HTML Code

HTML Code is given below, This code contains five checkboxes, with four checkboxes for four different options and one checkbox to check/uncheck all checkboxes.

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Check UnCheck all Checkboxes with one Checkbox in JavaScript</title>
</head>
<body>
<input type="checkbox" name="lang" value="html">HTML<br/>
<input type="checkbox" name="lang" value="css">CSS<br/>
<input type="checkbox" name="lang" value="javascript">JAVASCRIPT<br/>
<input type="checkbox" name="lang" value="php">PHP<br/>
<input type="checkbox" onclick='checkUncheck(this)'/>Check All<br/>
</body>
</html>

JavaScript Code

JavaScript Code is given below, In this code the JavaScript checked Property is used with JavaScript this keyword and getElementsByName() method.

JavaScript checked Property

The JavaScript checked Property is used to set the state of checkbox or to read it's state to see whether it is already checked or not.

JavaScript this keyword

JavaScript this keyword refers to the HTML element that has triggered the event. In our example it's Check All checkbox.

getElementsByName() method

The getElementsByName() method is used to get or select all HTML elements with the specified value of name attribute.

Take a look at the code given below.

<script>
function checkUncheck(main) {
  all = document.getElementsByName('lang');
  for(var a=0;a<all.length;a++) {
    all[a].checked = main.checked;
  }
}
</script>

Video Tutorial

Watch video tutorial on Check UnCheck all Checkboxes with one Checkbox in JavaScript.

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