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JavaScript - how to get selected text and value from option select on change

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5 points

Using jQuery it is possible to get select element value on change event in following way.

1. option:selected selector example

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<head>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>
</head>
<body>
  <select id="my-dropdown-id">
    <option value="1">Blue</option>
    <option value="2" selected>Green</option>
    <option value="3">Red</option>
    <option value="4">Yellow</option>
  </select>
  <script>

    $(document).ready(function() {
        var element = $('#my-dropdown-id');

        element.change(function() {
          	var selection = $('option:selected', element); // $(':selected', element);
          
          	var value = selection.val();
          	var text = selection.text();
          
          	console.log('value: ' + value + ', text: ' + text);
		});
    });

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

2. find method with option:selected selector example

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<head>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>
</head>
<body>
  <select id="my-dropdown-id">
    <option value="1">Blue</option>
    <option value="2" selected>Green</option>
    <option value="3">Red</option>
    <option value="4">Yellow</option>
  </select>
  <script>

    $(document).ready(function() {
        var element = $('#my-dropdown-id');

        element.change(function() {
          	var selection = element.find("option:selected"); // element.find(":selected");
          
          	var value = selection.val();
          	var text = selection.text();
          
        	console.log('value: ' + value + ', text: ' + text);
        });
    });

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

3. selectionIndex and options properties example

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<head>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>
</head>
<body>
  <select id="my-dropdown-id">
    <option value="1">Blue</option>
    <option value="2" selected>Green</option>
    <option value="3">Red</option>
    <option value="4">Yellow</option>
  </select>
  <script>

    $(document).ready(function() {
        var element = $('#my-dropdown-id');

        element.change(function() {
            var options = element.prop('options');

            // below code uses pure JavaScript

            var index = options.selectedIndex;

            if(index == -1) {
                console.log('Option is not selected.');
            } else {
                var option = options[index];

                var value = option.value;
                var text = option.label

                console.log('value: ' + value + ', text: ' + text);
            }
		});
	});

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

 

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