How to check if checkbox is checked in JavaScript

To check if a checkbox is checked in JavaScript, you can use the checked property of the HTML element. This property sets or returns the checked state of a checkbox.

Let us say that you have the following checkbox input field:

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

You can use the following code to check if the checkbox is checked or not:

const elem = document.querySelector('#checkbox')
if (elem.checked) {
  console.log(`Checkbox is checked!`)
} else {
  console.log(`Checkbox is not checked.`)
}

We used the querySelector() method to retrieve the checkbox element from DOM using its ID attribute value. Next, we inspected the value of the checked property to decide whether the checkbox was checked or not.

The checked property can also be used to change the checked status of a checkbox programmatically using JavaScript, as shown below:

// Mark checkbox as checked
document.querySelector('#checkbox').checked = true

// Uncheck checkbox
document.querySelector('#checkbox').checked = false

If you are using jQuery, the is() function can also be used to check if a checkbox is checked or not:

if ($('#checkbox').is(':checked')) {
  console.log(`Checkbox is checked!`)
} else {
  console.log(`Checkbox is not checked.`)
}

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