onfocus Event

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Example

Execute a JavaScript when an input field gets focus:

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Definition and Usage

The onfocus event occurs when an element gets focus.

The onfocus event is often used on input fields.

Focus Based Events

Event	Description	Bubbles
focus	An element gets focus	No
blur	An element looses focus	No
focusin	An element gets focus	Yes
focusout	An element looses focus	Yes

Syntax

In HTML:

<element onfocus="myScript">

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In JavaScript:

object.onfocus = function(){myScript};

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In JavaScript, using the addEventListener() method:

object.addEventListener("focus", myScript);

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Technical Details

Bubbles:	No
Cancelable:	No
Event type:	FocusEvent
Supported HTML tags:	ALL HTML elements, EXCEPT: <base>, <bdo>, <br>, <head>, <html>, <iframe>, <meta>, <param>, <script>, <style>, and <title>
DOM Version:	Level 2 Events

Browser Support

onfocus is a DOM Level 2 (2001) feature.

It is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	9-11

More Examples

Example

Using onfocus and onblur:

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Example

Clear input field on focus:

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Example

Event delegation: using focus and blur events:

Set useCapture parameter of addEventListener() to true:

<form id="myForm">
<input type="text" id="myInput">
</form>

<script>
let x = document.getElementById("myForm");
x.addEventListener("focus", myFocusFunction, true);
x.addEventListener("blur", myBlurFunction, true);

function myFocusFunction() {
document.getElementById("myInput").style.backgroundColor = "yellow";
}

function myBlurFunction() {
document.getElementById("myInput").style.backgroundColor = "";
}
</script>

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Example

Event delegation: using focusin and focusout events:

<form id="myForm">
<input type="text" id="myInput">
</form>

<script>
let x = document.getElementById("myForm");
x.addEventListener("focusin", myFocusFunction);
x.addEventListener("focusout", myBlurFunction);

function myFocusFunction() {
document.getElementById("myInput").style.backgroundColor = "yellow";
}

function myBlurFunction() {
document.getElementById("myInput").style.backgroundColor = "";
}
</script>

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