Why you need AngularJS ?:

There was a time many internet years ago when any kind of logic within a web page had to be sent to the server for processing and then re-rendered as an entirely new web page. This “call and refresh” arrangement made for a disjointed user experience, which was only exacerbated when network latency was especially high. The entire paradigm was upended with the introduction of XMLHttpRequest and the ability to make asynchronous calls to the server without actually having to refresh the page. This made for a much more coherent user experience because the user could perform a task that required a remote call and still interact with the application as the call was being made and processed. This is where the first wave of JavaScript frameworks landed and managed to prove that working with JavaScript could be done in a mostly sane way and no one was going to lose life or limb.

Here we make a angular js tutorial in hindi

How AngularJS makes your life easier ?.

Most people would agree that jQuery won that round, partially because jQuery did such a good job of abstracting away all of the insanity surrounding browser variations, and allowed developers to use a single, simplified API to build websites. The next frontier was to make websites behave and operate as if they were actual applications; this ushered in an entirely new set of challenges. For instance, jQuery has done an exceptional job of providing tools to manipulate the DOM, but it offers no real guidance on how to organize your code into an application structure. We’ve all heard horror stories of how a jQuery “application” ballooned out into a monstrosity that could barely be maintained, much less extended. This desperate need to write large, maintainable JavaScript applications has given birth to a JavaScript framework renaissance. In the last couple of years, a slew of frameworks has burst onto the scene, with many of them quietly fading off into oblivion. But a few frameworks have proven themselves to be solid options for writing large-scale web applications that can be maintained, extended, and tested. One of the most popular, if not the most popular, frameworks to emerge is AngularJS from Google. AngularJS is an open-source web application framework that offers quite a bit to a developer through a stable code base, vibrant community, and rich ecosystem. Let’s identify some of the high-level advantages of using AngularJS before we get into some of the more technical details of the framework.

What is Angular Js. ?

AngularJS is a very dynamic and quickly evolving framework. AngularJS is an open-source web application framework that offers quite a bit to a developer through a stable code base, vibrant community, and rich ecosystem. Let’s identify some of the high-level advantages of using AngularJS before we get into some of the more technical details of the framework.

Advantages of using AngularJS :

AN INTUITIVE FRAMEWORK MAKES IT EASY TO ORGANIZE YOUR CODE  :

As previously stated, there’s a pressing need to be able to organize your code in a way that promotes maintenance, collaboration, readability, and extension. AngularJS is constructed in such a way that code has an intuitive place to live, with clear paths to refactor code when it has reached a tipping point. Do you have code that needs to provide information on how a user interface is supposed to look and behave? There’s a place for that. Do you have code that needs to contain a portion of your domain model and be available for the rest of the application to use? There’s a place for that. Do you need to programmatically perform DOM manipulation? There’s even a sane place for that as well!

TESTABLE CODE MAKES IT EASIER TO SLEEP AT NIGHT :

Testable code isn’t going to win any awards for being the most exciting feature of a framework, but it’s the unsung hero of any mature framework. AngularJS was written from the ground up to be testable, and likely this feature, along with the design decisions that came from this commitment, has played a huge role in the adoption of AngularJS. How do you actually know if your application works? The fact that it hasn’t broken yet is a flimsy answer, as it’s only a matter of time before that black swan shows up at your door. You can never entirely mitigate against bugs, but you can truly eliminate certain possibilities through rigorous testing. A framework that is conducive to writing testable code is a framework that you’re going to write tests in. And when you write tests, you’ll spend less time looking over your shoulder wondering when everything is going to come crashing down. You’ll be able to go to bed at night and not have to worry about a 2 a.m. call from DevOps that something has gone awry and you need to fix it immediately.

TWO-WAY DATA BINDING SAVES YOU HUNDREDS OF LINES OF CODE :

Two-way data binding is the supermodel of the feature set. Hundreds of years ago, when we were writing jQuery applications, you would’ve had to use jQuery to query the DOM to find a specific element, listen for an event, parse the value of the DOM element, and then perform some action on that value. In AngularJS, you simply have to define a JavaScript property and then bind to it in our HTML, and you’re done. There are obviously some variations to this scenario, but it’s not uncommon to hear of jQuery applications being rewritten and thousands of lines of JavaScript just disappearing. By cutting out all of the boilerplate code that was previously required to keep our HTML and JavaScript in sync, you’re able to accomplish more work in less time with significantly less effort. This gives you more time to do more of what you love.

TEMPLATES THAT ARE HTML MEANS YOU ALREADY KNOW HOW TO WRITE THEM HTML  is an inherently limited language that was designed to facilitate layout and structure, not complex interactions. In other words, it wasn’t created to live in the world of the modern web application as we know it now. Some frameworks try to overcome this limitation by abstracting out HTML entirely into strings or some preprocessor dialect. The problem is that HTML is actually good as a declarative mechanism and there’s this annoying reality about HTML—pretty much everyone knows it. If you’re working on a large team, there’s a good chance that you’re going to have a UI/UX contributor who’ll be responsible for generating your HTML templates. It’s important to leverage a workflow and skill set that they’re already familiar with, and AngularJS makes this a breeze. AngularJS embraces HTML while giving developers the ability to overcome its limitations by extending it to do whatever it is we need.

DATA STRUCTURES THAT ARE JUST JAVASCRIPT MAKE INTEGRATION REALLY EASY  On the flip side, being able to work with Plain Old JavaScript Objects (POJOs) makes integrating with other technologies incredibly easy. By consuming and emitting JavaScript without having to wrap and unwrap it in proprietary framework mechanisms, you’re able to consume data from other sources much more efficiently. You can render JSON models from the server and instantly consume them in AngularJS when the application bootstraps. You can also take the model that you’re working with and pass it off to another technology—such as an application server—without having to transform it at all. There are some pretty interesting features of AngularJS that are fairly academic in nature; we’ve tried to outline a few major points of how AngularJS makes our lives easier in a very practical sense. At the end of the day, having a framework that allows us to write stable code quickly and efficiently so that we have more time and energy to do other meaningful things is a tool that we want to use!