JavaScript onchange Event
You are Here:
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>
Reminder
Hi Developers, we almost covered 97% of JavaScript Tutorials with examples for quick and easy learning.
We are working to cover every Single Concept in JavaScript.
Please do google search for:
Join Our Channel
Join our telegram channel to get an instant update on depreciation and new features on HTML, CSS, JavaScript, jQuery, Node.js, PHP and Python.
This channel is primarily useful for Full Stack Web Developer.