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AngularJS

A Brief Introduction

{ By: Nirmal V }

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An-gu-lah?

Why should I?

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To answer that question

a little bit of history recap is needed...

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Web History

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Static Pages

<html>
  <body>
    <h1>Mattias homepage</h1>
    <p>Welcome to my homepage</p>
  </body>
</html>

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Generated Pages

$name = "Mattias";
print "<html>";
print "<body>";
print "<h1>$name homepage</h1>";
print "<p>Welcome to my homepage</p>";
print "</body>";
print "</html>";

Perl

Php

<html>
<body>
<h1><?php $name="Mattias"; echo $name ?> homepage</h1>
<p>Welcome to my homepage</p>
</body>
</html>

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Javascript & DOM

<html>
<body>
<h1></h1>
<p>Welcome to my homepage</p>
<script>
    h1 = document.getElementsByTagName("h1")[0];
    h1.innerHTML = "Mattias Homepage";
</script>
</body>
</html>
  • DOM Manipulation
  • Browser Compatibility Problems

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JQuery

<html>
<body>
<h1></h1>
<p>Welcome to my homepage</p>
<script>
    $("h1").innerHTML("Mattias Homepage");
</script>
</body>
</html>
  • Powerful element selection
  • Browser Compatibility handled by Library
  • Same DOM Manipulation

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jQuery.

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Once a best friend forever

 

...until the era of webapps

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It has grown from

 

a handy DOM manipulation tool...

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to an all-in-one juggernaut

 

without much forethoughts

Web Apps

jQuery + Webapp = Headaches

  • Structureless spaghetti code

  • Selectors creating tight coupling

  • Not enough high level abstractions

Then, there is

Backbone.js

It brings structures to our codes

...but still uses jQuery to handle the Views

Issues Solved by Backbone

 

  • Spaghetti code

Issues NOT Solved
by Backbone

 

  • Selectors creating tight coupling

What about

High Level Abstractions?

Well, since Backbone is unopinionated...

 

 

It lacks the necessary tools

to easily manage any webapp

above a certain threshold in complexity

 

From personal experiences...

 

  • Single view? Cool.
  • Multiple sibling views? Cool.
  • Multiple nested views? OMG.

(Many real-world webapps belong to this category)

In the end,

Backbone asks you to write

A Lot More Codes

to get what you want

 

AngularJS

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Here to save your day

What the * is

AngularJS

and why should I use it, exactly?

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It's

FAST

(Once you two become good buddies)

It brings

QUALITY

(Both in terms of code structure and robustness)

It's

FREE

(w00t!)

AngularJS

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puts a heavy emphasis on

Separation of Concerns

It's better to build UI

DECLARATIVELY

It's better to separate

DOM MANIPULATION

from

REAL LOGICS

It's better to separate

Client Code

from

Server Code

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AngularJS - MVC Architecture

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Model − It is the lowest level of the pattern responsible for maintaining data.

View − It is responsible for displaying all or a portion of the data to the user.

Controller − It is a software Code that controls the interactions between the Model and View.

AngularJS - MVC Architecture

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AngularJS - Important Parts

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ng-app − This directive defines and links an AngularJS application to HTML.

ng-model − This directive binds the values of AngularJS application data to HTML input controls.

ng-bind − This directive binds the AngularJS Application data to HTML tags.

AngularJS - Directives

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ng-app − This directive starts an AngularJS Application.

ng-init − This directive initializes application data.

ng-model − This directive defines the model that is variable to be used in AngularJS.

ng-repeat − This directive repeats html elements for each item in a collection.

AngularJS
Scope & Controller

Scope in AngularJS

is a plain old Javascript object

 

$scope

{

    $$childHead: Child

    $$childTail: Child

    $$listeners: Object

    $$nextSibling: Child

    $$prevSibling: null

    $$watchers: Array[2]

    $id: '004'

    $parent: Child

 ...

}

Each

Controller Instance

has its own Scope

The properties of a Scope is the

corresponding Controller's

Model

And the

View Template

knows nothing about the Controller

...except those

exposed through the Scope

Kinda Like a ViewModel

Let's practice with  some examples!

Questions?

nirmalkamath@gmail.com

http://codenirmal.com/

angularjs

By nirmalvyas

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