Why is Angular development such a popular choice for dynamic web applications? What are the frameworks strengths and drawbacks? And what are examples of the kind of applications Angular might be a good choice for and others it may be less well suited to?
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Before going into more detail on Angular as a front-end technology choice, let’s quickly cover some fundamentals:
The web page content is static or does not change. Static pages are created using HTML and CSS.
Dynamic or interactive websites change the content being served to the user without needing to be refreshed by being reloaded in the browser. For example, a Facebook or LinkedIn feed will load comments made by another user in real-time.
Document Object Model. The object-level representation of a web page. You can write JS code to manipulate web page objects within the DOM.
The structure, design, behaviour, and content of everything seen on browser screens when websites, web applications, or mobile apps are opened, is implemented by front-end developers. A good front end must have high performance (load quickly) and be responsive. A responsive page appears correctly on devices of all sizes from computer monitor to smartphone. All key parts of the website’s front end should render in a way that is appropriate to the screen size.
Single Page Client Applications – the entire web application or website is available under a single URL.
Some of the more popular front-end JS Frameworks are:
Google released Angular.js, as earlier versions of the framework were known, as an open-source framework in 2009. It has since been maintained and further developed by a combination of developer communities and continued Google support. Versions after Angular 2 are referred to as just Angular.
Angular is a framework that uses HTML and TypeScript to build single-page client applications. It extends HTML attributes with directives. Angular implements the Model-View-Controller (MVC) and Model-View-View Model (MVVM ) architectural patterns that form a solid basis for application performance.
The MVVM separates data, the model and the controller. the separation of data from design and visual representation makes complex web applications easier to manage. Data binding ensures changes that happen on the website initiate changes to the DOM. If you make changes to the design, those changes are reflected on the site thanks to the two-way data binding.
Briefly, Angular consists of:
A data model is a collection of data used by the application.
Angular Views represent this data. A view can also be said to be a group of display elements that can be created or modified together. Views can have hierarchies. They are represented with an HTML template and a component class. A view can access the data model and you can have several ways of displaying model data, using views. Angular renders a view under the control of one or more directives.
Data binding is a process that allows applications to display data values or changes to data, and also respond to user actions like a mouse click, keystrokes or a touch. It is the mechanism that binds the applications User Interface (UI) to the data models.
With data binding, Angular handles the details of changes in data from the page, listening to events, updating application data and so on. You just have to declare the relationship between an HTML widget and a data model and let the framework handle the details.
You must learn data binding concepts to fully understand Angular.
Angular applications use components to display items in the browser or application. A component consists of the following parts:
Some of the advantages of using Angular in web development projects are:
Angular can be used to create applications that span various domains and categories such as
Some popular apps based on angular development:
As with any web development technology, Angular isn’t suitable for any kind of front end you might want to build. Some examples would be:
Angular development generally doesn’t make sense for simple applications such as company websites designed to deliver static content. Using Angular to develop such sites will only add additional code and functionality that will not be used as well as unnecessarily increasing costs build and maintenance costs.
Angular applications should be built and maintained by skilled Angular developers. Because Angular developers are more expensive than developers in PHP and other languages that great static websites can be built using,it the framework probably isn’t a good choice for smaller projects with corresponding budget constraints.
Angular is not effective for the development of higher interactive UIs such as those found in gaming applications. Angular tests every DOM object before it changes its position. Also, gaming apps require a lot of mathematical analysis, which Angular can’t handle.
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<script>tag. Angular extends HTML attributes with Directives and binds data to HTML with Expressions.
The quickest way to get started is to point your HTML
<script>tag to a Google CDN URL. This way, you don’t have to download anything or maintain a local copy.
To point your code to an Angular script on the Google CDN server, use the following template:
<!doctype html> <html ng-app> <head> <title>My First Angular App!!</title> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.6/angular.min.js"></script> </head> <body> </body> </html>
Angular extends HTML with the use of directives. Directives are markers on a DOM element used to specify custom behaviour for that element. Angular directives begin with the prefix “ng”. Some of the in-built directives in Angular are: “ng-app”, “ng-init”, “ng-model”, “ng-bind”, “ng-repeat” and so on.
Some of the commonly used directives are:
This directive defines an Angular application. It defines the root element of the application.
This directive binds the value of HTML controls like the text, select, or text area to application data. It binds the value entered to an application variable name.
This directive binds application data to the HTML view. The ng-bind directive is used by Angular to replace the content of an HTML element with the value of the specified variable or expression. If the value of the variable changes, the content of the specified HTML element also changes.
This option is for those who want to work with Angular offline or host the files on their own servers.
As you get started with Angular, you must learn about modules, controllers, expressions, directives, scopes, filters, DOM, forms, ajax, validation, services, animation, dependency injection, views, w3.css and so on.
We have covered briefly some topics like directives and views. A detailed explanation of all components is out of scope for this article but you can read more at the Angular.io guide.
<!DOCTYPE html> <html> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script> <body> <div ng-app=""> <p>Name: <input type="text" ng-model="name"></p> <p ng-bind="name"></p> </div> </body> </html>
Angular’s HTML compiler allows the use of directives to attach new attributes to any HTML element. Angular compilation takes place in the web browser automatically. It does not have any pre-compilation or server-side process.
Angular uses the <$compiler> service to compile an HTML page. The compilation process triggers once the HTML page (static DOM) is completely loaded.
It occurs in two phases:
Compile: Checks the entire DOM and collects the directives
Link: Connects the directives with a scope and produces a live view
Some of the Integrated Development Environments (IDEs) used by Angular include:
The Angular documentation includes the Developer Guide covering concepts and the API Reference for syntax and usage.
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