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<!DOCTYPE html>
<html>
<body>
​
<form action="https://www.w3schools.com/action_page.php">
  Checkbox: <input type="checkbox" id="myCheck" name="test">
  <input type="submit">
</form>
​
<p>Click the "Try it" button to set the required property for the checkbox.</p>
​
<p><strong>Tip:</strong> Click the "Submit" button before and after you have clicked the "Try it" button, to see the effect.</p>
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  document.getElementById("myCheck").required = true;
  document.getElementById("demo").innerHTML = "The required property was set. The checkbox must now be checked before submitting the form.";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_checkbox_required2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:46:42 GMT -->
</html>
​
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