With AngularJS, you can never go wrong.
To come-up with top notch apps, you could contract an AngularJS development company or hire AngularJS developer. Picking the right AngularJS development services provider will help you to get customized apps and guarantee for faster business progress.Codezilla is one stop destination for all your needs.Two way data binding, power of MVVM , Easy testing, Requires less code writing, this features make app development easy and result very intuitive.
Some of the key advantages of
using AngularJS framework include:
It provides an excellent “desktop-like” experience to the end-user.
By freeing the developer from having to register callbacks manually or write repetitive low-level DOM manipulation tasks, it saves months of development.
By separating DOM manipulation from app logic, it makes code modular and easy to test.
It supports two-way data binding.
To adapt to the new AngularJS 1.5 components, you would need to change .directive to component.
- Data Binding
Each AngularJS application has only one root scope. Child controllers, however, create scope for each view. When the new scopes are created, they are added to their parent root scope as child scopes. This creates a hierarchical structure when they are attached.
Data binding is the automatic attunement
of data between the view and model
components. AngularJS uses two-way data
binding. In one-way binding, the scope
variable in the HTML is set to the first
value that its model is assigned to.
In two-way binding, the scope variable changes its value every time its model binds to a different value.
Directives are unique markers on a DOM element that tell the HTML compiler to attach a specified behavior to the DOM element. Directives start with ng-prefix. Some of the built-in directives include ngClass, ngApp, ngRepeat, ngModel, ngBind and ngInit. List the different types of directives.
There are four types of
- Comment directives
- CSS class directives
- Attribute directives
- Element directives
You can use a directive as an element, attribute, or class name. To define the way your directive will be used, you need to set the restrict option in the directive declaration. The restrict option can be set to:
- ‘A’ - Only matches attribute name
- ‘C’ - Only matches class name
- ‘E’ – Only matches element name
You can combine these restrictions to produce needed results.
During every digest cycle, all new scope
model values are compared against the
previous values. This is called dirty
checking. If change is detected, watches
set on the new model are fired, and
another digest cycle executes. This goes
on until all models are stable.
The digest cycle is triggered automatically, but it can be called manually using “.$apply().”
The common ways of communication
- Using Event
- Using services
- By assigning models on $rootScope
- Directly between controllers using ControllerAs and other forms of inheritance
- Directly between controllers using $parent, $$childHead, $$nextSibling
The link function combines the directives with a scope to produce a live view. The link function is responsible for instance DOM manipulation and for registering DOM listeners. The compile function is responsible for template DOM manipulation as well as the collection of all the directives.
End-to-end (e2e) testing involves testing an application from start to finish to determine whether all the components are working correctly. It catches issues within an application related to integration and flow.
Dependency injection is the process where the dependent objects are injected rather than being created by the consumer.
Dependency injection has two significant benefits: Testing and decoupling.
SPA is the concept whereby pages are loaded from the server not by doing postbacks, instead of by creating a single shell page or master page and loading the web pages into the master page.
SPA can be implemented with Angular by using Angular routes.
Use one-time Angular
- Use web worker
- Work in batches
- Cache DOM
- Remove unnecessary watchers
- Use one-time Angular binding
React JS is doubtless non-risky, advanced and responsive.
Aiming primarily to provide speed, simplicity, and scalability, React.js helps build and support highly dynamic web and mobile applications. It facilitates the developers’ work and the users’ interaction with the product. Reusable and highly testable React.js components further increase development speed and quality.the giants like Facebook, Airbnb, DropBox, IMDb, Instagram, Netflix, PayPal, Tesla Motors, and Walmart are using React.js framework due to its great efficiency.
Major features of React are
It uses the virtual DOM instead of the
It uses server-side rendering.
It follows uni-directional data flow or data binding.
Some of the major advantages of React are - It increases the application’s performance. It can be conveniently used on the client as well as server side, Because of JSX, code’s readability increases React is easy to integrate with other frameworks like Meteor, Angular, etc Using React, writing UI test cases become extremely easy.
Limitations of React are listed
React is just a library, not a full-blown framework, Its library is very large and takes time to understand. It can be little difficult for the novice programmers to understand Coding gets complex as it uses inline templating and JSX
Components are the building blocks of a React application’s UI. These components split up the entire UI into small independent and reusable pieces. Then it renders each of these components independent of each other without affecting the rest of the UI.
Each React component must have a render() mandatorily. It returns a single React element which is the representation of the native DOM component. If more than one HTML element needs to be rendered, then they must be grouped together inside one enclosing tag such as "form", "group","div" etc. This function must be kept pure i.e., it must return the same result each time it is invoked.
States are the heart of React components. States are the source of data and must be kept as simple as possible. Basically, states are the objects which determine components rendering and behavior. They are mutable unlike the props and create dynamic and interactive components. They are accessed via this.state().
Arrow functions are more of brief syntax for writing the function expression. They are also called ‘fat arrow‘ (=>) the functions. These functions allow to bind the context of the components properly since in ES6 auto binding is not available by default. Arrow functions are mostly useful while working with the higher order functions.
A reliable and progressive framework.
single page web applications. It can streamline web development
by using as a web application framework. Vue is smaller, faster
and flexible. It provides ease in development due to rich HTML
templates. The documentation is up-to-date, and the syntax is
simple.Vue.js will serve you in better form if you want to
Companies familiar with Vue.js are Behance, Xiaomi, Laracasts, Codeship, Gitlab, Alibaba, Facebook, Netflix, Grammarly and Adobe.
Yes and No. Vue.js only converts normal
properties into getters and setters so
it can get notified when the properties
are accessed or changed. When
serialized, your data will look exactly
the same. There are, of course,
When you console.log observed objects you will only see a bunch of getter/setters. However you can use vm.$log() to log a more inspectable output.
You cannot define your own getter/setters on data objects. This isn’t much of a problem because data objects are expected to be obtained from plain JSON and Vue.js provides computed properties.
Vue.js adds a few extra properties/methods to observed objects: __ob__, $add, $set and $delete. These properties are innumerable so they will not show up in for ... in ... loops. However if you overwrite them things will likely break.
That’s pretty much it. Accessing properties on the object is the same as before, JSON.stringify and for ... in ... loops will work as normal. 99.9% of the time you don’t even need to think about it.
Vue.js has gone through some API changes in the latest 0.12 release, but this is the last planned point release before 1.0. In the meanwhile, there already companies/projects using Vue.js in production.
Vue.js is free and fully open sourced under the MIT License.
There are a few reasons to
use Vue over Angular, although
they might not apply for
Vue.js is a more flexible, less opinionated solution. That allows you to structure your app the way you want it to be, instead of being forced to do everything the Angular way. It’s only an interface layer so you can use it as a light feature in pages instead of a full blown SPA. It gives you bigger room to mix and match with other libraries, but you are also responsible for making more architectural decisions. For example, Vue.js’ core doesn’t come with routing or ajax functionalities by default, and usually assumes you are building the application using an external module bundler. This is probably the most important distinction.
Vue.js is much simpler than Angular, both in terms of API and design. You can learn almost everything about it really fast and get productive.
Vue.js has better performance and is much, much easier to optimize, because it doesn’t use dirty checking. Angular gets slow when there are a lot of watchers, because every time anything in the scope changes, all these watchers need to be re-evaluated again. Also, the digest cycle may have to run multiple times to “stabilize” if some watcher triggers another update. Angular users often have to resort to esoteric techniques to get around the digest cycle, and in some situations there’s simply no way to optimize a scope with a large amount of watchers. Vue.js doesn’t suffer from this at all because it uses a transparent dependency-tracking observing system with async queueing - all changes trigger independently unless they have explicit dependency relationships. The only optimization hint you’ll ever need is the track-by param on v-repeat lists.
Vue.js has a clearer separation between directives and components. Directives are meant to encapsulate DOM manipulations only, while Components stand for a self-contained unit that has its own view and data logic. In Angular there’s a lot of confusion between the two. But also note that Vue.js is a relatively young project, while Angular is battle-proven, Google-sponsored, and has a larger community.
React and Vue.js do have some
similarity in that they both provide
reactive & composable View
components. However the internal
implementation is fundamentally
different. React is built upon a
virtual DOM - an in-memory
representation of what the actual
DOM should look like. Data in React
is largely immutable and DOM
manipulations are calculated via
diffing. On the contrary data in
Vue.js is mutable and stateful by
default, and changes are triggered
through events. Instead of a virtual
DOM, Vue.js uses the actual DOM as
the template and keeps references to
actual nodes for data bindings.
Another issue with React is that because DOM updates are completely delegated to the Virtual DOM, it’s a bit tricky when you actually want to control the DOM yourself (although theoretically you can, you’d be essentially working against the library when you do that). For applications that needs ad-hoc custom DOM manipulations, this can become a pretty annoying restriction. On this front, Vue.js allows for more flexibility and there are multiple FWA/Awwwards winning sites built with Vue.js.
Polymer is yet another
Google-sponsored project and in fact
was a source of inspiration for
Vue.js as well. Vue.js’ components
can be loosely compared to Polymer’s
custom elements, and both provide a
very similar development style. The
biggest difference is that Polymer
is built upon the latest Web
Components features, and requires
non-trivial polyfills to work (with
degraded performance) in browsers
that don’t support those features
natively. In contrast, Vue.js works
without any dependencies down to
Also, in Polymer 1.0 the team has really made its data-binding system very limited in order to compensate for the performance. For example, the only expressions supported in Polymer templates are the boolean negation and single method calls. Its computed property implementation is also not very flexible.
Finally, when deploying to production, Polymer elements need to be bundled via a Polymer-specific tool called vulcanizer. In comparison, single file Vue components can leverage everything the Webpack ecosystem has to offer, and thus you can easily use ES6 and any CSS pre-processors you want in your Vue components.
First, Vue provides a cleaner syntax
in getting and setting VM
On a higher level, Vue differs from Knockout in that Vue’s component system encourages you to take a top-down, structure first, declarative design strategy, instead of imperatively build up ViewModels from bottom up. In Vue the source data are plain, logic-less objects (ones that you can directly JSON.stringify and throw into a post request), and the ViewModel simply proxies access to that data on itself. A Vue VM instance always connects raw data to a corresponding DOM element. In Knockout, the ViewModel essentially is the data and the line between Model and ViewModel is pretty blurry. This lack of differentiation in Knockout makes it much more likely to result in convoluted ViewModels.
Riot 2.0 provides a similar component-based development model (which is called a “tag” in Riot), with a minimal and beautifully designed API. I think Riot and Vue share a lot in design philosophies. However, despite being a bit heavier than Riot,
Vue does offer some
significant advantages over
- True conditional rendering (Riot renders all if branches and simply show/hide them)
- A far-more powerful router (Riot’s routing API is just way too minimal)
- More mature tooling support (see webpack + vue-loader)
- Transition effect system (Riot has none)
- Better maintenance status (As of Aug 31st 2015, Riot has 25 open bugs while Vue has zero)
- Better performance. (Riot in fact uses dirty checking rather than a virtual-dom, and thus suffers from the same perf issues with Angular.)
Modern, enhanced UI without costing much
Powerful security aspects due to its wider usage in front-end as
well as in back-end programming
Constantly evolving due to the open-source community
Fewer dependencies, flexibility, and incredibly-faster
Runs on the majority of the platforms(app, web, mobile web, PWA,
Accomplish The Following Types Of Applications:
Chatbots and AI
IoT and Robots
Netscape Communications Corporation, Mozilla Foundation.
Single line comment followed by '//' and Block of comments placed between '/*' and '*/'.
Alert, Confirm and Prompt.
Document Object Model (DOM) is an application programming interface (API).
DOM is used to access logical structure of the HTML document.
Using DOM we can access, modify, change CSS styles, create Elements and Text nodes, delete Elements.
We can access Element in the document.
Using 'innerHTML' property we can change
the content of Element.
document.getElementById("element_id_name").innerHTML = "New text";
By adding attribute to
document.getElementById("element_id_name").align = "center";
By adding style.propertyname to
document.getElementById("element_id_name").style.backgroundColor = "orange";
By using 'document.createElement()'.
By using 'document.createTextNode()'.
By using 'appendChild()'.
By using 'removeChild()'.
In Document Object Model, every element is called as Node.
By using 'window.innerWidth' and 'window.innerHeight'.
By using 'history.back()'.
By using 'history.forward()'.
By using 'location.href'.