JavaScript onchange Event
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JavaScript onchange Event
The onchange event occurs when the value of an element has been changed.
onchange Event as Attribute
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Try to change the value in select tag</p>
<select id="mySelect" onchange="myFunction()">
<option>Harley Davidson</option>
<option>Honda</option>
<option>Suzuki</option>
<option>Yamaha</option>
</select>
<p id="point"></p>
<script>
function myFunction() {
var x = document.getElementById("mySelect").value;
document.getElementById("point").innerHTML = "You selected: "+x;
}
</script>
</body>
</html>
Syntax
As Attribute
<element onchange = "JavaScript">
As Property
object.onchange = function(){
// code
};
Using Event Listener
object.addEventListener("change" , myScript);
onchange Event as Property
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Try to change the value in select tag</p>
<select id="mySelect">
<option>Harley Davidson</option>
<option>Honda</option>
<option>Suzuki</option>
<option>Yamaha</option>
</select>
<p id="point"></p>
<script>
var x = document.getElementsByTagName("select")[0];
function myFunction() {
var x = document.getElementById("mySelect").value;
document.getElementById("point").innerHTML = "You selected: "+x;
}
x.onchange = myFunction;
</script>
</body>
</html>
Using addEventListener() Method
Note: The addEventListener() method is not supported in Internet Explorer 8 and below.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Try to change the value in select tag</p>
<select id="mySelect">
<option>Harley Davidson</option>
<option>Honda</option>
<option>Suzuki</option>
<option>Yamaha</option>
</select>
<p id="point"></p>
<script>
var x = document.getElementsByTagName("select")[0];
function myFunction() {
var x = document.getElementById("mySelect").value;
document.getElementById("point").innerHTML = "You selected: "+x;
}
x.addEventListener("change", myFunction);
</script>
</body>
</html>
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