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Other References

CSSStyleDeclaration JS Conversion


onblur Event

Example

Execute a JavaScript when a user leaves an input field:

<input type="text" onblur="myFunction()">
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Definition and Usage

The onblur event occurs when an element loses focus.

The onblur event is often used on input fields.

The onblur event is often used with form validation (when the user leaves a form field).


Focus Based Events

EventDescriptionBubbles
focusAn element gets focusNo
blurAn element looses focusNo
focusinAn element gets focusYes
focusoutAn element looses focusYes

Syntax

In HTML:

<element onblur="myScript">
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In JavaScript:

object.onblur = function(){myScript};
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In JavaScript, using the addEventListener() method:

object.addEventListener("blur", 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

onblur is a DOM Level 2 (2001) feature.

It is fully supported in all browsers:

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


More Examples

Example

Using onfocus and onblur attributes:

<input type="text" onfocus="focusFunction()" onblur="blurFunction()">
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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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