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JavaScript - onchange event for input checkbox element example

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Created by:

maryam

1181

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

1. `onchange` attribute example

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<!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>

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2. `onchange` property example

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<!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>

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3. `addEventListener` method example

Edit

xxxxxxxxxx
 
<!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>