Difference between AngularJS Expression and Angular Expression
Last Updated :
25 Jul, 2023
AngularJS is a JavaScript-based framework that can be used by adding it to an HTML page using a <script> tag. AngularJS helps in extending the HTML attributes with the help of directives and binding of data to the HTML with expressions. Angular on the other hand is a client-side TypeScript-based, front-end web framework by Google.
Angular is a great, reusable UI (User Interface) library for developers that help in building attractive, and steady web pages and web application.
An Expression in Angular or Angular JS is a code snippet that can be simple or complex JavaScript-like code, like, the variable references, function calls, operators, and filters, etc, written within double curly braces {{ }} in order to evaluate & display dynamic values or perform calculations in the template.
In this article, we will learn about Angular Expression & Angular JS Expression, their implementations & the difference between them.
AngularJS Expression
AngularJS, the predecessor of Angular, introduced the concept of expressions as a way to bind dynamic data to HTML templates. AngularJS Expressions are written within double curly braces {{ }} and are evaluated by the framework to generate values displayed in the UI. These expressions are based on JavaScript and can include variables, function calls, operators, and literals.
Syntax:
In the below syntax, the msg variable is defined in the AngularJS controller and its value will be displayed in the <p> element.
<p>
{{ mymsg }}
</p>
Example: Below example demonstrates the usage of expressions in the Angular JS application.
HTML
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<title>
Angular JS Expression
</title>
<script src=
</script>
</head>
<body>
<div ng-controller="MyCtrl">
<h1 style="color: green">
GeeksforGeeks
</h1>
<h2>AngularJS Expressions </h2>
<p>{{ mymsg }}</p>
</div>
<script>
angular.module('myApp', [])
.controller('MyCtrl', function ($scope) {
$scope.mymsg = 'Welcome to GeeksforGeeks!';
});
</script>
</body>
</html>
|
Output:
Angular Expression
Angular takes a different approach to handle dynamic data by replacing expressions with a more powerful mechanism called Angular templates. Angular templates provide a declarative approach to data binding and are designed to offer enhanced flexibility and efficiency.
Syntax:
In the below syntax, the msg property is bound to the <p> element and its value will be displayed.
// app.component.html
<p>{{ mymsg }}</p>
// app.component.ts
export class AppComponent {
mymsg = 'Hello, Geek!';
}
Example: Below example demonstrates the usage of Expressions in the Angular application.
- newcomponent.component.ts
Javascript
import { Component } from '@angular/core';
@Component({
selector: 'app-welcome',
templateUrl: './welcome.component.html',
styleUrls: ['./welcome.component.css']
})
export class WelcomeComponent {
mymsg: string = 'Welcome to GeeksforGeeks!';
}
|
- newcomponent.component.html
HTML
<div>
<h1 style="color: green">
GeeksforGeeks
</h1>
<h2>AngularJS Expressions </h2>
<p>{{ mymsg }}</p>
</div>
|
HTML
<div>
<app-new-component></app-new-component>
</div>
|
Output:
Difference between AngularJS Expression and Angular Expression:
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It is based on JavaScript language.
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It is based on the TypeScript language.
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The expressions are directly used within HTML templates.
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The expressions are used within Angular templates.
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The expressions are evaluated within the controller scope.
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The expressions are evaluated within the component context.
|
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AngularJS expressions have limited safety restrictions, as it permits potentially harmful operations.
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Angular Expressions, on the other side, provide safety restrictions for preventing harmful operations.
|
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The Expressions in Angular JS are less efficient in large-scale applications due to the digest cycle.
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The expressions in Angular are highly efficient in the detection mechanism for better performance in large-scale applications.
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