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Onchange attribute in html

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  • The onchange attribute trigger an event when the value of the element is changed.
  • The onchange attribute is a section of the Event Attributes.

Syntax for onchange attribute in HTML:

<element onchange="script" >

Applies To:

Element Attribute
All HTML Elements onchange

onchange Attribute Value:

Value Description
script The script can run on onchange.

Sample Coding for onchange Attribute in HTML:

Tryit<!DOCTYPE html>
<html>
    <head>
        <title>Wikitechy onchange attribute</title>
    </head>
    <body>
       Select Wikitechy Tutorial :<br><br>
       <select name="tutorial" onchange="onChange(this.value)">
           <option value="HTML">Wikitechy HTML</option>
           <option value="CSS">Wikitechy CSS</option>
           <option value="PHP">Wikitechy PHP</option>
       </select>
       <script>
         function onChange(val) {
               alert("The Value Changed as : " + val);
               }
       </script>
    </body>
</html>

Code Explanation for onchange Attribute in HTML:

onchange Attribute Code Explanation

  1. onchange attribute used to call the onChange JavaScript function when the drop-down list value changed.
  2. The onChange JavaScript function display an alert message with the selected value.

Output for onchange Attribute in HTML:

onchange Attribute Output

  1. The output shows the drop-down list and user try to change the value.
  2. onchange Attribute Output
  3. When user try to change the value HTML to PHP the alert box show an message as “The Value Changed as : PHP”

Browser Support for onchange Attribute in HTML:

Yes Yes Yes Yes Yes

Tips and Notes

  • The onchange event is similar to the oninput event.
  • The difference is which the oninput event shows suddenly after the value of an element has changed, although onchange event shows when the element drops focus.

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