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JavaScript - onchange event for input checkbox element example

4 points
Created by:
maryam
971

In this article, we want to show different ways to handle change event for input checkbox element using JavaScript.

1. onchange attribute example

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<body>
  <label>
  	<input type="checkbox" onchange="onChange(this)" /> Agreement
  </label>
  <script>

    function onChange(element) {
    	console.log('Agreement changed to ' + element.checked);
    }

  </script>
</body>
</html>

2. onchange property example

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<body>
  <label>
  	<input id="agreement" type="checkbox" /> Agreement
  </label>
  <script>

    var agreement = document.querySelector('#agreement');

    agreement.onchange = function(element) {
    	console.log('Agreement changed to ' + agreement.checked);
    };

  </script>
</body>
</html>

3. addEventListener method example

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<body>
  <label>
  	<input id="agreement" type="checkbox" /> Agreement
  </label>
  <script>

    var agreement = document.querySelector('#agreement');

    agreement.addEventListener('change', function(element) {
    	console.log('Agreement changed to ' + agreement.checked);
    });

  </script>
</body>
</html>
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JavaScript - events

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