onfocusin Event
Example
Execute a JavaScript when an input field is about to get focus:
<input type="text"
onfocusin="myFunction()">
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More "Try it Yourself" examples below.
Definition and Usage
The onfocusin event occurs when an element is about to get focus.
Tip: The onfocusin event is similar to the onfocus event. The main difference is that the onfocus event does not bubble. Therefore, if you want to find out whether an element or its child gets the focus, you should use the onfocusin event.
Tip: Although Firefox does not support the onfocusin event, you can find out whether a child of an element gets the focus or not, by using a capturing listener for the onfocus event (using the optional useCapture parameter of the addEventListener() method).
Tip: The onfocusin event is the opposite of the onfocusout event.
Browser Support
The numbers in the table specify the first browser version that fully supports the event.
| Event | |||||
|---|---|---|---|---|---|
| onfocusin | Yes | Yes | 52.0 | Yes | Yes |
Note: The onfocusin event may not work as expected in Chrome, Safari and Opera 15+ using the JavaScript HTML DOM syntax. However, it should work as an HTML attribute and by using the addEventListener() method (See syntax examples below).
Syntax
In JavaScript (may not work as expected in Chrome, Safari and Opera 15+):
object.onfocusin = function(){myScript};
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In JavaScript, using the addEventListener() method:
object.addEventListener("focusin", myScript);
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Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions.
Technical Details
| Bubbles: | Yes |
|---|---|
| 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 "onfocusin" together with the "onfocusout" event:
<input type="text" onfocusin="focusFunction()" onfocusout="blurFunction()">
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Example
Event delegation: setting the useCapture parameter of addEventListener() to true (for focus and blur):
<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:
<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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