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HTML | DOM onchange Event

  • Last Updated : 28 Jun, 2019

The HTML DOM onchange event occurs when the value of an element has been changed. It also works with radio buttons and checkboxes when the checked state has been changed.

Note: This event is similar to the oninput event but the only difference is that the oninput event occurs immediately after the value of an element has changed, while onchange occurs when the element loses focus.

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Syntax:

In HTML:



<element onchange="myScript">

In JavaScript:

object.onchange = function(){myScript};

In JavaScript, using the addEventListener() method:

object.addEventListener("change", myScript);

Example: Using HTML




<!DOCTYPE html>
<html>
  
<body>
    <center>
        <h1 style="color:green">
          GeeksforGeeks
      </h1>
        <h2>HTML DOM onchange Event</h2>
  
        <select id="LangSelect" onchange="GFGfun()">
            <option value="c">C</option>
            <option value="java">JAVA</option>
            <option value="html">HTML</option>
            <option value="python">PYTHON</option>
        </select>
  
        <p id="demo"></p>
  
        <script>
            function GFGfun() {
                var x = document.getElementById("LangSelect").value;
                document.getElementById(
                    "demo").innerHTML = "You selected: " + x;
            }
        </script>
    </center>
</body>
  
</html>

Output:
Before:

After:

Example: Using JavaScript




<!DOCTYPE html>
<html>
  
<body>
    <center>
        <h1 style="color:green">
          GeeksforGeeks
      </h1>
        <h2>HTML DOM onchange Event</h2> Email:
        <input type="email" id="email">
  
        <script>
            document.getElementById(
              "email").onchange = function() {
                GFGfun()
            };
  
            function GFGfun() {
                var x = document.getElementById("email");
                x.value = x.value.toLowerCase();
            }
        </script>
  
    </center>
</body>
  
</html>

Output:
Before:

After:

Example: In JavaScript, using the addEventListener() method:




<!DOCTYPE html>
<html>
  
<body>
    <center>
        <h1 style="color:green">
          GeeksforGeeks
      </h1>
        <h2>HTML DOM onchange Event</h2> Email:
        <input type="email" id="email">
  
        <script>
            document.getElementById(
                "email").addEventListener(
              "change", GFGfun);
  
            function GFGfun() {
                var x = document.getElementById("email");
                x.value = x.value.toLowerCase();
            }
        </script>
    </center>
  
</body>
  
</html>

Before:

After:

Supported Browsers: The browsers supported by DOM onchange Event are listed below:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Apple Safari
  • Opera



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