Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
AngularJS – ng-change Directive
The ng-change directive in AngularJS evaluates a given expression whenever the user changes the input. On every change, the ngChange directive is fired and the expression is evaluated immediately. The JavaScript onChange event only triggers at the end of a change (when the user leaves the form element or presses the <Enter> key).
Note − This directive also requires ngModel to be present.
Syntax
<element ng-change="expression">..Content..</element>
Example − ngChange Directive
Create a file "ngChange.html" in your Angular project directory and copy-paste the following code snippet.
<!DOCTYPE html>
<html>
<head>
<title>ngChange Directive</title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
</script>
</head>
<body style="text-align: center;">
<h1 style="color:green">
Welcome to Tutorials Point
</h1>
<h2>
AngularJS | ngChange Directive
</h2>
<div ng-app="demo" ng-controller="app">
Check to show/hide details
<input type="checkbox" ng-change="show()" ng-model="check">
<br><br>
<div style="padding:50px; margin-left: auto; margin-right: auto; border:1px solid black; width:30%;color:green" ng-show='result'>
Start Learning the new Angular JS features now...
</div>
</div>
<!-- Script for passing the values and checking... -->
<script>
var app = angular.module('demo', []);
app.controller('app', function ($scope) {
$scope.show = function () {
if ($scope.check == true)
$scope.result = true;
else
$scope.result = false;
}
});
</script>
</body>
</html>Output
To run the above code, just go to your file and run it as a normal HTML file. You will see the following output on the browser window.
Example 2
Create a file "ngChange.html" in your Angular project directory and copy-paste the following code snippet.
<!DOCTYPE html>
<html>
<head>
<title>ngChange Directive</title>
<script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
</script>
</head>
<body style="text-align: center;">
<h1 style="color:green">
Welcome to Tutorials Point
</h1>
<h2>
AngularJS | ngChange Directive
</h2>
<div ng-app="demo" ng-controller="prop">
<div>
Are you a developer:
<input type="checkbox" ng-model="isTrue" ng-change="cnt=cnt+1" ng-init="cnt=0"/>
</div>
Count: {{cnt}}
<pre>{{isTrue}}</pre>
</div>
<!-- Script for passing the values and checking... -->
<script>
var app = angular.module("demo", []);
app.controller('prop', ['$scope', function ($app) {
$app.isTrue = false;
}]);
</script>
</body>
</html>Output
To run the above code, just go to your file and run it as a normal HTML file. You will see the following output on the browser window.
608 Views
