JavaScript onkeydown Event
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JavaScript onkeydown Event
The onkeydown event occurs when the user presses a keyboard key.
onkeydown Event as Attribute
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<input type="text" onkeydown="myFunction()">
<script>
function myFunction(){
alert("You pressed a key inside the input field");
}
</script>
</body>
</html>
Syntax
As Attribute
<element onkeydown = "JavaScript">
As Property
object.onkeydown = function(){
// code
};
Using Event Listener
object.addEventListener("keydown" , myScript);
onkeydown Event as Property
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<input type="text">
<script>
var x = document.getElementsByTagName("input")[0];
function myFunction(){
alert("You pressed a key inside the input field");
}
x.onkeydown = 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>
<input type="text">
<script>
var x = document.getElementsByTagName("input")[0];
function myFunction(){
alert("You pressed a key inside the input field");
}
x.addEventListener("keydown", myFunction);
</script>
</body>
</html>
onkeydown vs onkeypress vs onkeyup
Check out the difference between onkeydown vs onkeypress vs onkeyup in javascript.
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