onblur Event
Example
Execute a JavaScript when a user leaves an input field:
<input type="text" onblur="myFunction()">
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More "Try it Yourself" examples below.
Definition and Usage
The onblur event occurs when an object loses focus.
The onblur event is most often used with form validation code (e.g. when the user leaves a form field).
Tip: The onblur event is the opposite of the onfocus event.
Tip: The onblur event is similar to the onfocusout event. The main difference is that the onblur event does not bubble. Therefore, if you want to find out whether an element or its child loses focus, you could use the onfocusout event. However, you can achieve this by using the optional useCapture parameter of the addEventListener() method for the onblur event.
Browser Support
| Event | |||||
|---|---|---|---|---|---|
| onblur | Yes | Yes | Yes | Yes | Yes |
Syntax
In JavaScript, using the addEventListener() method:
object.addEventListener("blur", myScript);
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Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions.
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 |
More Examples
Example
Using "onblur" together with the "onfocus" event:
<input type="text" onfocus="focusFunction()" onblur="blurFunction()">
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Example
Event delegation: setting the useCapture parameter of addEventListener() to true:
<form id="myForm">
<input type="text" id="myInput">
</form>
<script>
var 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 the focusin event (not supported by Firefox):
<form id="myForm">
<input type="text" id="myInput">
</form>
<script>
var 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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