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AngularJS Directives


AngularJS lets you extend HTML with new attributes called Directives.


AngularJS Directives

AngularJS directives are extended HTML attributes with the prefix ng-.

The ng-app directive initializes an AngularJS application.

The ng-init directive initialize application data.

The ng-model directive binds the value of HTML controls (input, select, textarea) to application data.

AngularJS Example

<div ng-app="" ng-init="firstName='John'">

<p>Name: <input type="text" ng-model="firstName"></p>
<p>You wrote: {{ firstName }}</p>

</div>

Try it Yourself »

The ng-app directive also tells AngularJS that the <div> element is the "owner" of the AngularJS application.

Note A web page can contain many AngularJS applications, running in different elements.


Data Binding

The {{ firstName }} expression, in the example above, is an AngularJS data binding expression.

Data binding in AngularJS, synchronizes AngularJS expressions with AngularJS data.

{{ firstName }} is synchronized with ng-model="firstName".

In the next example two text fields are synchronized with two ng-model directives:

AngularJS Example

<div ng-app="" ng-init="quantity=1;price=5">

Quantity: <input type="number" ng-model="quantity">
Costs:    <input type="number" ng-model="price">

Total in dollar: {{ quantity * price }}

</div>

Try it Yourself »

Note Using ng-init is not very common. You will learn how to initialize data in the chapter about controllers.


Repeating HTML Elements

The ng-repeat directive repeats an HTML element:

AngularJS Example

<div ng-app="" ng-init="names=['Jani','Hege','Kai']">
  <ul>
    <li ng-repeat="x in names">
      {{ x }}
    </li>
  </ul>
<div>

Try it Yourself »

The ng-repeat directive used on an array of objects:

AngularJS Example

<div ng-app="" ng-init="names=[
{name:'Jani',country:'Norway'},
{name:'Hege',country:'Sweden'},
{name:'Kai',country:'Denmark'}]">

<ul>
  <li ng-repeat="x in names">
    {{ x.name + ', ' + x.country }}
  </li>
</ul>

</div>

Try it Yourself »

Note AngularJS is perfect for database CRUD (Create Read Update Delete) applications.
Just imagine if these objects were records from a database.


The ng-app Directive

The ng-app directive defines the root element of an AngularJS application.

The ng-app directive will auto-bootstrap (automatically initialize) the application when a web page is loaded.

Later you will learn how ng-app can have a value (like ng-app="myModule"), to connect code modules.


The ng-init Directive

The ng-init directive defines initial values for an AngularJS application.

Normally, you will not use ng-init. You will use a controller or module instead.

You will learn more about controllers and modules later.


The ng-model Directive

The ng-model directive binds the value of HTML controls (input, select, textarea) to application data.

The ng-model directive can also:

  • Provide type validation for application data (number, email, required).
  • Provide status for application data (invalid, dirty, touched, error).
  • Provide CSS classes for HTML elements.
  • Bind HTML elements to HTML forms.

The ng-repeat Directive

The ng-repeat directive clones HTML elements once for each item in a collection (in an array).




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