AngularJS Basic ng focus Simple Example

2021-07-07 06:10:29
OfStack

AngularJS ng-focus Directive

AngularJS instance

Executes the expression when the input box gets focus:


<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body ng-app="">

<input ng-focus="count = count + 1" ng-init="count=0" />

<h1>{{count}}</h1>

<p> This instance evaluates the variable every time the input box gets focus  "count"  Will automatically add  1 . </p>

</body>
</html>

This instance automatically increments the calculation variable "count" by 1 each time the input box gets focus.

Definition and usage

The ng-focus instructions are used to tell AngularJS what to do when an HTML element gets focus.

The ng-focus instruction does not override the element's original onfocus event, and when the event is fired, both the ng-focus expression and the original onfocus event are executed.

Grammar

< element ng-focus="expression" > < /element >

< a > , < input > , < select > , < textarea > , and window objects support this directive.

Parameter value

值	描述
expression	元素获取焦点时执行的表达式。

The above is the basic data collation of Angular ng-focus, which will be supplemented in the future.