Top 22 Reasons To Choose Angularjs

AngularJS is an open-source front-end javascript framework which is developed and maintained by Google. It is used to develop a browser-based application with Model–View–Controller (MVC) capability. It also reduces the amount of javascript needed to build a web application. I listed the some of the reason to use AngularJS 1.X below.

1. Solid Community

AngularJs has its own community. Some people work in the core department, while the others contribute by making changes and improvements for open-source frameworks.

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AngularJS has been a focus point of interest all over the world with several conferences and discussions scheduled about it. There are numerous books and resources available to developers who’d like to explore AngularJS further.

2. Single Page Applications

Single page application loads a single HTML page and updates the content of a page dynamically when a user is interacting with an app on the page without reloading that page constantly.

We can produce a single page application design using the router concept in AngularJS. UI-Router is the one of most used router component in AngularJS. This would be useful for larger applications and websites with dynamic content.

3. MVVM

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MVC( Model-View-Controller) is a software design pattern for developing web applications.

To make an application using  MVC design pattern, you’ve to split the application into individual MVC components and then write code to connect them all. In AngularJs, you just have to break the application into MVC Components, AngularJS itself would take care of the rest. It manages your elements and serves as the pipeline by integrating them. This two-way binding is achieved using MVVM design pattern.

In MVVM (Model–View–ViewModel) design pattern, the controller is replaced by View Model. View Model is just a javascript function like the driver, but the only difference being the fact that any updates done in View, are updated in the Model as well. If we change anything in the model, it shows up in View. This concept is called 2-way data binding.

4. Angular Directives

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Directives are javascript components which provide an HTML tag, attribute or CSS class with YOUR defined name. They behave like a DSL language element in the page.

It helps code reusability and embeds extra functionality to HTML, without any complications.

When you create a directive with your HTML template, it would have its own controllers. The data and view would be handled by the specific controller in this directive. So, there is no need to combine this directive controller with that of the App.

With Directive:

<!DOCTYPE html>
<html ng-app="'directiveModule'">
<head>
<meta charset="utf-8" />
<title> Highcharts directive demo </title>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.5/angular.min.js"></script>
<script type="text/javascript" src="https://code.highcharts.com/highcharts.js"></script>
</head>
<body ng-controller="mainController">

<hc-chart options="chartOptions">Placeholder for generic chart</hc-chart>

<script>
angular.module('directiveModule', [])
// Directive for generic chart, pass in chart options
.directive('hcChart', function () {
return {
restrict: 'E',
template: '<div></div>',
scope: {
options: '='
},
link: function (scope, element) {
Highcharts.chart(element[0], scope.options);
}
};
})
.controller('mainController', function ($scope) {

$scope.chartOptions = {
title: {
text: 'Fruits Available'
},
xAxis: {
categories: ['Apple', 'Orange', 'Mango', 'Fineapple', 'Grape']
},

series: [{
data: [500, 320, 106, 129, 144] }]
}]
};
});
</script>
</body>
</html>

Generally, we need to create a container for every chart and repeat the same code every time. It is not an optimistic way as it doesn’t separate the presentation code from logic and data. We can optimize this process using the AngularJs directive. We could use the directive anywhere in the application to create a chart and just pass the data to the Directive.

Without Directive:

<!DOCTYPE html>
<html ng-app="directiveModule">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.5/angular.min.js"></script>
<script src="https://code.highcharts.com/highcharts.js"></script>
</head>
<body ng-controller="mainController">
<div id="container">Placeholder for chart</div>
<script>
angular.module('directiveModule', [])
.controller(‘mainController’, function ($scope) {
Highcharts.chart('container', {
xAxis: {
categories: ['Apple', 'Orange', 'Mango', 'Fineapple', 'Grape']
},
series: [{
data: [500, 320, 106, 129, 144]
}]
});
});
</script>
</body>
</html>

We could create separate directives for PieChart, LineChart, and BarChart and use them as well. When we do that, a directive will act as a DSL in that page.

5. Flexibility with filters

Image Source: Examiron

Filters take care of handling the data before it reaches the view. They are designed to be standalone functions like directives which are separate from your app, and they deal solely with data transformations.

A filter can format decimal places on a number, filter an array or an object based on the parameter we want, or implement the pagination. We could also create our custom filters, and this aspect enables data flexibility.

Example:

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body>
<p>Click the table headers to change the sorting order:</p>
<div ng-app="sampleApp" ng-controller="maincontroller">
<table border="1" width="100%">
<tr>
<th ng-click="orderByMe('fruit')">Fruit</th>
<th ng-click="orderByMe('price')">Value</th>
</tr>
<tr ng-repeat="x in names | orderBy:myOrderBy">
<td>{{x.fruit}}</td>
<td>{{x.price}}</td>
</tr>
</table>
</div>
<script>
angular.module('sampleApp', []).controller('maincontroller', function($scope) {
$scope.names = [
{fruit:'Orange',price:50},
{fruit:'Apple',price:100},
{fruit:'FineApple',price:55},
{fruit:'Grapes',price:28},
{fruit:'Banana',price:48}
];
$scope.orderByMe = function(x) {
$scope.myOrderBy = x;
}
});
</script>
</body>
</html>

The usage of filters enhances flexibility remarkably. It enables us to tackle an HTML table without the help of javascript. You could refer this link to know more about AngularJS filters.

6. Dependencies Injections

Image source: Logiticks

In AngularJS, the objects are given their dependencies instead of hard coding them within the objects, making dependencies easily configurable. This process is called Dependency Injection. This process passes on the dependency to a component whenever it needs them. As a result, there is no need for a constructor.

JS file:

var app = angular.module("angularApp", []);
// Controller is injected with $scope and $http as dependencies
app.controller("firstController", function ($scope, $http) {
$http.get('https://api.github.com/users/angular/repos')
.success(function (repos) {
$scope.repos = repos
});
});

HTML:

<body ng-app="DemoApp" ng-controller="DemoController">
<h3>Angular Github Repositories</h3>
<ul>
<li ng-repeat="repo in repos">
<a ng-href="{{repo.html_url}}"> {{ repo.name }} </a>
</li>
</ul>
</body>

In above example, firstController is injected with two dependencies: $scope and $http.The controller neither knows nor cares about the fact how the object is created. It only understands the contract provided by these objects and how to consume them.

We can add dependencies in any order because AngularJS recognizes dependencies by their specific parameters name and not based on the order which they are inserted.

To use external library or modules you’ve to inject it in the app. After injecting it, you can use it anywhere in the application. It is not advisable to initialize the dependencies in the main method, which is used to pass the execution of the code as it lacks the straightforwardness. Instead, it is good to opt for frameworks as they would provide dependency injections rather quickly making the app to be fluid and fast.

7. Controller

Image source: earnwebtutorials

Most of the JS frameworks don’t have the concept of the controller. In AngularJS, the controllers are used to regulate and provide data to the view. Without controller concept, it would be a Bottom-Up process rather than Top-down approach.

The controller simplifies the process of creating and integrating a sub-system. It allows us to control a particular view data without depending on any other components.

A Controller also helps in dependency injection. Dependencies are typically introduced to the view using them.

8. Top-down Approach

Image source: Guru99

Most of the frameworks use the bottom-up approach to design a page. However, AngularJs uses a Top-down approach.

Typically when developing a product, our mindset would be designing it using a top-down strategy and the bottom-up approach would be vastly different making things difficult.

In bottom-up approach base class is designed first, then, they are connected using the main class. On the other hand, in AngularJs, maincontroller is designed before the child controller.

The Main module of the application is built first, and then the other modules are built in parallel.

In Top-down, the whole software system is considered to be a single entity, and then it decomposes to produce more one or more sub-systems/components. Then, each sub-system would be treated as a system, and they are decomposed further. This process would run until the lowest level of the system is achieved.

Bottom-up design starts with the most specific and basic components. It then proceeds to compose higher level components using the basic ones. This process continues to create higher level components until the desired result is achieved.

9.Client Side Rendering

Image Source: usinenouvelle

AngularJs supports caching. It allows us to cache the unchanged data when the first request is called. This process reduces the traffic and responds to the API calls. Enabling Caching in AngularJS, increases the server performance. Initially, when a request is made it caches the result, and when we try the same request next time, it checks for any change in the content. If there are no changes in the content, it displays the previously cached result.

AngularJS has a built-in service called $cacheFactory. It helps to cache HTTP response to a request.

AngularJs is used as a client side rendering. It fetches the HTML template when it is loaded. After which server only has to send the JSON object. AngularJS in the client side is responsible for creating the HTML structure. Due to this, the server need not create an HTML structure and to be sent to the browser. This increases the server’s performance reducing the data consumption considerably.

10. Service providers

The controller in AngularJS is a simple function, which has only one job, manipulating the scope variable. Unlike other frameworks, a controller is not an object, and it doesn’t inherit anything. So, it is not possible to share data between the controllers. In AngularJS, service providers are used for sharing data and functions between the controllers.

Service providers are objects. We can use their object functionalities in any controller of the application. They act as a simple API to share data and some functionalities. A few common function and variables like getting a data from DB and updating a data in DB are written using service providers.

Example: JS File

var StudentService = angular.module('StudentService', [])
StudentService.factory('StudentDBOpr', ['$http', function ($http) {
var urlBase = 'your Api or Backend Url';
var StudentDBOpr = {};
StudentDBOpr.getStudents = function () {
return $http.get(urlBase+'/GetStudents');
};
StudentDBOpr.addStudent = function (stud) {
return $http.post(urlBase + '/AddStudent', stud);
};
return StudentDBOpr;
}]);
var myApp = angular.module('myApp', ['StudentService']);
myApp.controller('StudentController', function ($scope, StudentDBOpr) {
$scope.status;
$scope.students;
getStudents();
function getStudents() {
StudentDBOpr.getStudents()
.success(function (studs) {
$scope.students = studs;
})
.error(function (error) {
$scope.status = 'Unable to load data: ' + error.message;
});
}
$scope.addStudent = function () {
var stud = {
ID: 145,
FirstName: $scope.fname,
LastName: $scope.lname
};
StudentDBOpr.addStudent(stud)
.success(function () {
$scope.status = 'Student Inserted Successfully.';
$scope.students.push(stud);
}).
error(function (error) {
$scope.status = 'Unable to insert Student: ' + error.message;
});
};
});

HTML file:

<div ng-controller="StudentController">
<form class="well">
<input type="text" name="fname" ng-model="fname" placeholder="first name" /> <br/>
<input type="text" name="lname" ng-model="lname" placeholder="last name" />
<br /><br/>
<input type="button" value="add student" ng-click="addStudent()" />
</form>
<br/>
<table class="table">
<tr ng-repeat="s in students">
<td>{{ s.FirstName }}</td>
<td>{{ s.LastName }}</td>
</tr>
</table>
</div>

11. Saves time & less coding

Image Source: theninehertz

In AngularJS, you don’t have to write your own MVC pipeline. Directives are different from MVC so you can build them separately.

Data models are simple to write because they don’t need any getters/setters like Java and other languages. Data binding helps us put data on view automatically. In the case of any changes in the controller, it will affect the Dom and vice-versa. So we need not spend time writing any functionalities. Thus, it uses comparatively less code, letting us work faster.

Backbone js

HTML:

<div id="app">
<p>Write some text in the box: <input class="greeting-input" type="text" /></p>
<div class="greeting-output"></div>
</div>
<script type="text/x-handlebars-template" id="greeting-template">
<h1>Hello {{text}}</h1>
<h4>Uppercase: {{uppercaseText}}</h4>
<h4>Lowercase: {{lowercaseText}}</h4>
</script>

Js:

// Our model
var Greeting = Backbone.Model.extend({ defaults: { text: ''} });
var greeting = new Greeting();
// Our view
var GreetingView = Backbone.View.extend({
events: {
'keyup .greeting-input': 'editText',
'keydown .greeting-input': 'editText',
},
el: document.getElementById('app'),
template: Handlebars.compile($('#greeting-template').html()),
initialize: function() {
this.input = this.$el.find('.greeting-input');
this.output = this.$el.find('.greeting-output');
this.listenTo(this.model, 'change', this.render);
},
render: function() {
var text = this.model.get('text')
var templateData = {
text: text,
uppercaseText: text.toUpperCase(),
lowercaseText: text.toLowerCase()
};
this.output.html(this.template(templateData));
return this;
},
editText: function(e) {
// For smooth effect we'll use 'keyup'
// to grab text, but 'keydown' for Delete & Backspace
if (((e.which === 8 || e.which === 46)
&& e.type === 'keydown') || (e.type === 'keyup')) {
this.model.set('text', this.input.val().trim());
}
}
});
var greetingView = new GreetingView({ model: greeting });
greetingView.render();

AngularJS:

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body>
<div ng-app="Databinding" ng-controller="myCtrl">
Write some text in the box: <input ng-model="firstname">
<h1>Hello</h1>
<p><b>Uppercase :{{firstname | uppercase}}</p>
<p><b>Lowercase :{{firstname | lowercase}}</p>
</div>
<script>
var app = angular.module('Databinding', []);
app.controller('myCtrl', function($scope) {
$scope.text = "";
});
</script>
</body>
</html>

12.Easy Validation

Image source: scotch.io

AngularJs has inbuilt form validation capabilities. If your page has a form, this handles the validation aspect and displays the errors (if any). You can also use the built-in validation to make the custom validations.

AngularJs FormController makes a proper record of the form in the page. With the help of this data, we can give a different behavior to the HTML elements in UI like hiding a button, clearing the form if it is empty, etc.. It helps us by displaying the error msg for individual fields or the complete form as a whole.

13. Edge With Modules

 Image Source: entwicklertagebuch

This framework helps to form an application with the combination of separate modules. These modules may either be dependent on one another or autonomous. Dependency Injections helps us achieve this. We could use separate modules like page login part of the application and also use the data of these modules with other modules as well.

We could build the modules for normal login and facebook login separately. After which we can combine them using these modules in root application.

14. Ready-Made Advantage

We could solve a variety of tasks instantly in AngularJs, using its ready-made solutions. For routing, AngularJs has several modules, but UI-router is the most preferred one. For tables, we can use ng-table and ng-grid, and similarly, there are several ready-made solutions. As AngularJS doesn’t have a specific project structure, we are allowed to use our own project structures. This framework helps us to build hybrid applications.

15. Effective Data Binding

Image Source: dotnettricks

Data Binding is the coolest concept in AngularJS. It saves a lot of time as it uses considerably less code. Whenever a change is made to the user interface, reflects automatically in the view.

Whenever a change occurs, it changes the application object and vice-versa. It also updates the requisite patterns automatically. In one-way data binding, the conversation is restricted only to one direction, either view-model or model-view. In AngularJS, we can use one-way and two-way data binding.

We recommend using two-way binding only when it is necessary like instances where the connection between the View-Model and Model-View is vital. Then, go ahead with two-way data binding. Else, it is best to go with one-way binding, as unnecessary two-way data binding reduces the application’s performance.

16. Simple Testing

 Image Source: Testing

AngularJS make the testing of an application a very easy process. We can test both individual modules and the full application.

Unit testing is used for individual modules testing. As it is possible to test each module separately module, it is easy to manipulate them and run a retest again. It saves the time and provides crystal clear results. If an error occurs, instead of looking up the full application, we could just check the particular module and get it fixed.

17. Ease With Parallel Development

For large applications multiple key functions are necessary. AngularJS gives an option to the developer to write and test the code in parallel. A developer can reuse the code without being bothered by integration issues. This little niche makes developer’s life quite convenient.

While one developer develops the user profile setting module, at the same time, the other developers could develop other modules like login or something else. Simultaneously, someone else can write a code unit test too. Finally, we could integrate them all together.

18. POJO Data Models

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Angular’s data models are plain old javascript objects which mean, additional getters/setters are not needed to bind data with existing data sources.

We can embed or tweak properties directly, loop over objects and arrays as per requirements. Data gatekeepers and server sync are referred as a traditional data models, and they behave like smart data providers.

AngularJs model behaves like a corkboard. corkboard is more than a temporary storage but works in close collaboration with controller and view.

19. Linking Power

Is URL about a page? No, nowadays, URLs are not just about a page. However, we could view a particular section of a page directly through URL. Angularjs has some unique features to achieve this deep linking. Deep Linking takes us directly to the particular section of a page. This feature could also be enabled in VisualForce app.

20. UI Support / User Experience

AngularJS uses HTML to describe an application’s UI. HTML has an advantage with being a less complicated and more intuitive user interface over the other interfaces written in javascript.

You can declare which controllers should be employed for specific UI Elements. So you could focus more on the look and feel of your app’s UI. Just mention what you want, and AngularJS will control the dependencies to provide you exactly what you desire.

Using this AngularJS material, we can design more beautiful pages. It makes the app more visually appealing for the audience. AngularJS has a built-in directive like autocomplete and plugins like ng-table, Facebook-login, etc. These help the user interact with an app easily. It speeds up the development process and gives the app a visual bonus.

21. Contextual PubSub System

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PubSub is a common tool used to decouple communication. Most PubSub’s on the web are not aware of the content. We could make the PubSub message to be readable only by children of a particular node, to prevent unwanted MVC components from reading that. AngularJs Pubsub system broadcasts the message to child controllers. While emitting the message to parents, PubSub is not only used to communicate the between the controller but also to inform other controllers to update their views when properties change. We should rely on data binding as Parent scope value is available in the child controller, and we can override that using the child scope.

22. Tools

 Image Source: softwaretestingsolution

Grunt and gulp  to build the application and yeoman, bower for Workflow. For testing an application, AngularJS has tools  Karma, Protractor, Jasmine. You can find pre-built Popular Modules, Plugins and Directives for AngularJS here.

Future Ready

Image Source: asyncjs

Recently AngularJS team introduced Angular 2, which was equally awesome. It will make Angular rule the mobile world too. Many features have been added in Angular 2. Preformation has been increased, oops concept is being used more in Angular 2. Features available of Angular 1 are upgraded in Angular 2. So, Angular indeed has a very bright future.

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