Full Stack Developer at Three29 Media

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Level 7
32,040 XP
1 month ago
Activity icon

Replied to How To Check If Checkbox Is Checked?

In vanilla JavaScript you can make use of the checked property of the "checkbox" JavaScript element object. See examples on MDN.

Given you have the following HTML:

  <input type="checkbox" id="is_admin" name="is_admin" value="1">
  Is Admin

Then in JavaScript you can do this:

const isAdminCheckbox = document.querySelector('#is_admin');

console.log(isAdminCheckbox.checked ? 'Is Checked' : 'Is Unchecked');

You can check out this codepen example as well 👍

Like @coder222 mentioned, when the checkbox is unchecked and you're POST-ing the form, then that checkbox field won't even be present in PHP's $_POST array. One little trick I like to use to make sure the checkbox field is always present when the form is POST-ed (I've learned that from other people online), is placing a hidden input with the same name attribute and a default value before the checkbox itself in HTML, like so:

<input type="hidden" name="is_admin" value="0">
<input type="checkbox" id="is_admin" name="is_admin" value="1">


  • form POST-ed and is_admin is checked: $_POST['is_admin'] will be 1
  • form POST-ed and is_admin is unchecked: $_POST['is_admin'] will be 0