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目录

onblur Event

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Example

Call a function when a user leaves an input field:

<input type="text" onblur="myFunction()">
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Description

The onblur event occurs when an HTML 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

Event Occurs When
focus An element gets focus
blur An element loses focus
focusin An element gets focus
focusout An element loses focus

See Also:

The Focus Event Object

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
HTML tags: ALL HTML elements, EXCEPT: <base>, <bdo>, <br>, <head>, <html>, <iframe>, <meta>, <param>, <script>, <style>, and <title>
DOM Version: Level 2 Events

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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Browser Support

onblur 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


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