Angular-JS ng-repeat Directive

Last Updated : 09 Aug, 2019

Angular-JS ng-repeat directive is a handy tool to repeat a set of HTML code for a number of times or once per item in a collection of items. ng-repeat is mostly used on arrays and objects.
ng-repeat is similar to a loop that we have in C, C++ or other languages but technically it instantiates a template(normally a set of HTML structures) for each element in a collection that we are accessing. Angular maintains a $index variable as a key to the element which is currently being accessed and a user can also access this variable.

Syntax :

  <div ng-repeat="keyName in MyObjectName ">    {{keyName}}  </div>

Here “MyObjectName” is a collection that can be an object or an array and you can access each value inside it using a “keyName”.

Example 1

Create an app.js file for the app.

   var app = angular.module('myApp',[]); 
  
app.controller('MainCtrl', function($scope){ 
    $scope.names = ['Adam','Steve','George','James','Armin']; 
    console.log($scope.names); 
}); 
 
  

Line 1- Created an app module named “myApp” with no dependencies.
Line 3- Main controller for our application.
Line 4- Array of strings “names”.

Create index.html page

   <!DOCTYPE html> 
<html ng-app="myApp"> 
<head> 
     <title>Angular ng-repeat</title> 
     <script> type="text/javascript" src="jquery-3.2.1.min.js"> 
                                                      </script> 
     <script> type="text/javascript" src="angular.js"></script> 
     <script> type="text/javascript" src="app.js"></script> 
</head> 
<body ng-controller="MainCtrl"> 
     <h2>Here is the name list</h2> 
     <ul> 
        <li ng-repeat="name in names"> 
            {{name}} 
        </li> 
     </ul> 
</body> 
</html>  
 
  

Line 5- Include all the dependencies like jquery, angular-js and app.js file
Line 12- Use ng-repeat directive to get one name from names array at a time and display it.

Output :

Example 2

app.js file
var app = angular.module('myApp',[]);



app.controller('MainCtrl', function($scope){

    $scope.strings= ['Geeks','For','Geeks'];

    console.log($scope.strings);

});

We have a list of three strings.

index.html

   <!DOCTYPE html> 
<html ng-app="myApp"> 
<head> 
     <title>Angular ng-repeat</title> 
     <script> type="text/javascript" src="jquery-3.2.1.min.js"> 
                                                      </script> 
     <script> type="text/javascript" src="angular.js"></script> 
     <script> type="text/javascript" src="app.js"></script> 
</head> 
<body ng-controller="MainCtrl"> 
     <h2>Here is the string list</h2> 
     <ul> 
        <li ng-repeat="s in strings> 
            {{name}} 
        </li> 
     </ul> 
</body> 
</html>  
 
  

Note-“track by $index” is used here because there are duplicate entries in our list i.e. “Geeks”. Duplicate keys are not allowed because AngularJS uses keys to associate DOM nodes with items. “track by $index”, will cause the items to be keyed by their position in the array instead of their value

Output :

Applications:

ng-repeat can be used to iterate through an array which requires less lines of code than the usual javascript method.
Filters can be used with ng-repeat to create an easy to implement search bar.

References

AngularJS ng-open Directive

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Article Tags :

AngularJS

Angular-JS ng-repeat Directive

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