Heard a lot about Angular.js, but wondering if it will be a right choice for your web app? Becoming a preferred java script framework, amidst a group of frameworks, requires a significant potential. The added functionality which is not covered by other framework makes Angular.js a hot shot tool for making web applications.
Lets have a look at the benefits offered by Angular.js, in order to evaluate its liklihood for your next web app.
- Data Binding
Data binding tops the list of benefits offered by Angular.js. It is the automatic synchronization of data between the model and the view components. Data binding in Angular.js makes the model the single-source-of-truth. A single-source-of-truth refers to a practice where the structuring of the information models and associated schemata is done in a way that every data element is stored exactly once. Any possible linkage to the data element happens by reference only.
In two-way data binding an update made to a data element doesn’t needs to be manuly reflected to the entire system. It makes the view a projection of the model. That means any change made in model gets reflected on its own in the view and vice versa.
Data binding has its own advantages like:
a. Simplification of the programming model.
b. Easy testability of controller. Because controller is separated from the view its testing becomes easy in isolation without the view and related browser dependency.
c. Reduction in the amount of boilerplate code which is meant to keep the model and view in sync. Developers don’t need to write code that syncs the model with the view and view with the model.
Directives is element or attribute that helps represent a reusable DOM component. Angular.js has built-in directives like ngClass, ngModel and ngBind. The directives are used for commanding the HTML compiler to attach a specific behavior to a particular DOM element. They can also be used to transform the DOM element. In Angular.js one can include additional functionality by making use of directives.
Angular.js enables developers to invent one’s own HTML elements that cuts the need to manipulate the DOM. Only things required to be done is assigning of attributes to elements so as to get a particular functionality.
- Declarative UI
Angular.js uses HTML for templating. It is a declarative language known for its innate intuitiveness and easy reorganization. The templates contains Angular-specific attributes and elements like directives, markup, filter and form controls. Addition of tools like directives and filters adds clarity to the UI.
Having a declarative user interface makes things easy to understand and manipulate. For designer who are not programmers, learning markup becomes way more easier than programming. Use of HTML allows developers and designers to work at the same time. One can use declarative biding syntax so as to tie different UI components with data models and designers can create UI. By declaring one’s UI and placing the markup directly in HTML, one gets to separate presentation logic from the imperative logic.
Declarative UI also helps in reducing the side-effects which may pop out when one changes something. The side effect is reduced by declaration of the binding at the source and allowing the data binding to decouple the dependency on the idea from the presentation of the idea.
- Dependency Injection
Dependency injection permeates the framework of Angular.js. Dependency injection means allocating an instance variable to a object. It is a software design pattern that transacts with the way components get hold of its dependencies. With dependency injection it is easy to develop,test and understand an application.
Dependency injector system is responsible for creation of components, resolving their dependencies and supplying them to other components as requested.
Use of DOM as input, over the strings separates Angular.js from other frameworks. Using the DOM lets the developer extend the directive vocabulary and also build one’s own directives.The abstraction of DOM manipulations lets the UI designers to focus single-mindedly on the view without confusion. Usually it is the view that modifies and manipulates the DOM to add behavior. But in Angular.js DOM manipulation should happen inside the directives only. With Angular.js the view is seen as just another HTML page for data.
The important fact to be known is that Angular.js never manipulates the templates as strings. As told earlier the templating is done in plain HTML which are parsed by the browser into the DOM. That means the input to Angular.js is browser DOM and not an HTML string.
Web app development becomes way more easy if the developers don’t have to worry about DOM manipulation. DOM becomes the input to the Angular.js compiler. It is the directives that are responsible for setting up the data-binding for the application view.
The above mentioned 5 benefits make Angular.js worth a try.
Though you may have heard Angular.js users crib about its initial learning hurdles and temporary slowdown, still the long term benefits make it worth the try. However, the time spent in figuring out the framework is justified as solves the problems encountered in other software architectures.
Angular.js is worth your time.