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Developing simple and intuitive UI that improves the way our clients Wwrk
Maximize user experience through responsive, user-friendly and interactive designs.
Every business firm wants to have a feature-rich, functional, and user-friendly website or App to attract and retain customers in today’s competitive environment.This is where quality front-end web development plays a decisive role in making a business website appealing with impeccable performance.
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.
AngularJS is an open-source JavaScript framework designed for creating dynamic single web page applications with fewer lines of code.
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.
- Scope
- Controller
- Model
- View
- Services
- Data Binding
- Directives
- Filters
- Testable
The scope is a unique JavaScript object that plays the role of joining the controller (JavaScript) with the views (HTML). The controller sets properties on the scope, and the view binds to them.
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
directives:
- 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
include:
- 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
binding
- 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.
React is a front-end JavaScript library developed by Facebook in 2011. It follows the component based approach which helps in building reusable UI components. It is used for developing complex and interactive web and mobile UI. Even though it was open-sourced only in 2015, it has one of the largest communities supporting it.
Major features of React are
listed below:
It uses the virtual DOM instead of the
real DOM.
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
below:
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
A virtual DOM is a lightweight JavaScript object which originally is just the copy of the real DOM. It is a node tree that lists the elements, their attributes and content as Objects and their properties. React’s render function creates a node tree out of the React components. It then updates this tree in response to the mutations in the data model which is caused by various actions done by the user or by the system.
Browsers can only read JavaScript objects but JSX in not a regular JavaScript object. Thus to enable a browser to read JSX, first, we need to transform JSX file into a JavaScript object using JSX transformers like Babel and then pass it to the browser.
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.
Vue.js is an open-source JavaScript framework that can develop
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
integrate a front-end JavaScript framework into an existing
application
Companies familiar with Vue.js are Behance, Xiaomi, Laracasts,
Codeship, Gitlab, Alibaba, Facebook, Netflix, Grammarly and
Adobe.
Vue.js is able to deliver the plain JavaScript object syntax without resorting to dirty checking by using Object.defineProperty, which is an ECMAScript 5 feature. It only works on DOM elements in IE8 and there’s no way to polyfill it for JavaScript objects.
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,
some caveats:
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
everyone:
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.
The virtual-DOM approach provides a
functional way to describe your view
at any point of time, which is
really nice. Because it doesn’t use
observables and re-renders the
entire app on every update, the view
is by definition guaranteed to be in
sync with the data. It also opens up
possibilities to isomorphic
JavaScript applications.
Overall I’m a big fan of React’s
design philosophy myself. But one
issue with React (or JSX) is that
your render function often involves
a lot of logic, and ends up looking
more like a piece of program (which
in fact it is) rather than a visual
representation of the interface. For
some developers this is a bonus, but
for designer/developer hybrids like
me, having a template makes it much
easier to think visually about the
design and CSS. JSX mixed with
JavaScript logic breaks that visual
model I need to map the code to the
design. In contrast, Vue.js pays the
cost of a lightweight DSL
(directives) so that we have a
visually scannable template and with
logic encapsulated into directives
and filters.
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
IE9.
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
properties.
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
Riot:
- 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.)
JavaScript is everywhere and universal.
The benefits of choosing JavaScript for are:
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
performance
Runs on the majority of the platforms(app, web, mobile web, PWA,
and desktop)
Apart From The Mobile, Web, And Desktops, JavaScript Can
Accomplish The Following Types Of Applications:
Chatbots and AI
Gaming applications
Machine Learning
IoT and Robots
JavaScript is prototype-based scripting language.
Netscape Communications Corporation, Mozilla Foundation.
In 1995
Brendan Eich
Single line comment followed by '//' and Block of comments placed between '/*' and '*/'.
Using document.write()
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.
Example:
document.getElementById("element_id_name").innerHTML
= "New text";
By adding attribute to
'document.getElementById()'.
Example:
document.getElementById("element_id_name").align
= "center";
By adding style.propertyname to
'document.getElementById()'.
Example:
document.getElementById("element_id_name").style.backgroundColor
= "orange";
- onClick
- onChange
- onFocus
- onBlur
- onSubmit
- onLoad
- onMouseOver
- onMouseOut
By using 'document.createElement()'.
By using 'document.createTextNode()'.
By using 'appendChild()'.
By using 'removeChild()'.
In Document Object Model, every element is called as Node.
- Number
- String
- Math
- Date
- Array
- window
- document
- location
- history
- screen
By using 'window.innerWidth' and 'window.innerHeight'.
By using 'history.back()'.
By using 'history.forward()'.
By using 'location.href'.
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