EN
JavaScript - onfocus event example
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In this article, we would like to show you onfocus event example in JavaScript.
Quick solution:
var myElement = document.querySelector('#my-element');
myElement.addEventListener('focus', function() {
console.log('onfocus event occurred.');
});
or:
<input type="text" onfocus="handleFocus()">
or:
var myElement = document.querySelector('#my-element');
myElement.onfocus = function() {
console.log('onfocus event occurred.');
};
Practical examples
There are three common ways how to use onfocus event:
- with event listener,
- with element attribute,
- with element property.
1. Event listener based example
In this section, we want to show how to use onfocus event on input element via event listener mechanism.
// ONLINE-RUNNER:browser;
<!doctype html>
<html>
<body>
<p>Click on the input field to set focus.</p>
<input type="text" id="my-input">
<script>
var myInput = document.querySelector('#my-input');
myInput.addEventListener('focus', function() {
console.log('onfocus event occurred.');
});
</script>
</body>
</html>
2. Attribute based example
In this section, we want to show how to use onfocus event on input element via attribute.
// ONLINE-RUNNER:browser;
<!doctype html>
<html>
<body>
<p>Click on the input field to set focus.</p>
<input type="text" onfocus="handleFocus()">
<script>
function handleFocus(){
console.log('onfocus event occurred.');
}
</script>
</body>
</html>
3. Property based example
In this section, we want to show how to use onfocus event on input element via property.
// ONLINE-RUNNER:browser;
<!doctype html>
<html>
<body>
<p>Click on the input field to set focus.</p>
<input type="text" id="my-input">
<script>
var myInput = document.querySelector('#my-input');
myInput.onfocus = function() {
console.log('onfocus event occurred.');
};
</script>
</body>
</html>