Sunday, 26 April 2015

AngularJS Filters



Filters can be added to expressions and directives using a pipe character.

AngularJS Filters:
AngularJS filters can be used to transform data:
Filter
Description
currency
Format a number to a currency format.
filter
Select a subset of items from an array.
lowercase
Format a string to lower case.
orderBy
Orders an array by an expression.
uppercase
Format a string to upper case.


Adding Filters to Expressions:
A filter can be added to an expression with a pipe character (|) and a filter.
(For the next two examples we will use the person controller from the previous chapter)
The uppercase filter format strings to upper case:
<div ng-app="" ng-controller="personCtrl">

<p>The name is {{ lastName | uppercase }}</p>

</div>
The lowercase filter format strings to lower case:
<div ng-app="" ng-controller="personCtrl">

<p>The name is {{ lastName | lowercase }}</p>

</div>


The currency Filter:
The currency filter formats a number as currency:
<div ng-app="" ng-controller="costCtrl">

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

<p>Total = {{ (quantity * price) | currency }}</p>

</div>


Adding Filters to Directives:
A filter can be added to a directive with a pipe character (|) and a filter.
The orderBy filter orders an array by an expression:
<div ng-app="" ng-controller="namesCtrl">

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

<div>


Filtering Input:
An input filter can be added to a directive with a pipe character (|) and filter followed by a colon and a model name.
The filter filter selects a subset of an array:
<div ng-app="" ng-controller="namesCtrl">

<p>Filtering Input:</p>
<p><input type="text" ng-model="test"></p>

<ul>
  
<li ng-repeat="x in names | filter:test | orderBy:'country'">
    
{{ (x.name | uppercase) + ', ' + x.country }}
  
</li>
</ul>

</div>





















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