If you have a checkbox in a form you can use jQuery to read and set the data in the checkbox. Here is the HTML we’ll use an example for our checkbox:

<input type="checkbox" id="checkboxid">

Reading a Checkbox

When using jQuery and you wish to read whether a checkbox is checked or not.

$('#checkboxid').is(':checked');

This will return true if the checkbox is checked and false if left unchecked.

Checking or Unchecking the Checkbox

Use the .prop() function to manipulate the checkbox.

$("#checkboxid").prop('checked', true);  // Checks the box
$("#checkboxid").prop('checked', false); // Unchecks the box

The attr() function of jQuery has been deprecated since 1.6. However if you’re jQuery version is below 1.6 you must use this method.

$("#checkboxid").attr('checked', true);