Using angualr.forEach to append a placeholder element during iteration

Question

Using angualr.forEach to append a placeholder element during iteration

I'm currently working on an AngularJS application where I receive dynamic values from the backend in the form of a list ($scope.list). During the iteration of this list using forEach, I would like to add a dummy element.

To better illustrate this scenario, I have created a demo Plunker: https://plnkr.co/edit/XFFYAKEd6gPuL2JAWCbD?p=preview

In the provided demo Plunker, I have initialized a $scope.list and my goal is to incorporate an additional element while iterating through the list (e.g.

{id:'1900',firstname: 'dummyElement', lastname: 'D'}

). Any suggestions or feedback on how to achieve this?

javascript angularjs

Answer 1

Answer №1

If you need to insert additional elements, there's no need to loop through with angular.forEach. You can simply append the object directly to the array.

var app = angular.module("app", []);

app.controller("BaseController", function($scope) { 
  $scope.title = "Angular.ForEach";
  $scope.list = [
    {id:'11',firstname: 'Joe', lastname: 'Michael'},
    {id:'12',firstname: 'Mishal', lastname: 'A'},
    {id:'133',firstname: 'Dex', lastname: 'T'},
    {id:'144',firstname: 'Rayan', lastname: 'K'},
    {id:'121',firstname: 'Riyya', lastname: 'R'}
  ];
  $scope.list.push({id:'1900',firstname: 'dummyElement', lastname: 'D'});      
});

<!DOCTYPE html>
<html>

<head>
    <script data-require="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e3828d84968f8293819090">[email protected]</a>" data-semver="1.5.5" src="https://code.angularjs.org/1.5.5/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
</head>

<body ng-app="app" ng-controller="BaseController">
    <h1>{{title}}</h1>

    <br/><br/> List:

    <br/><br/> {{list}}


</body>

</html>

Answer 2

If you need to insert additional elements, there's no need to loop through with angular.forEach. You can simply append the object directly to the array.

var app = angular.module("app", []);

app.controller("BaseController", function($scope) { 
  $scope.title = "Angular.ForEach";
  $scope.list = [
    {id:'11',firstname: 'Joe', lastname: 'Michael'},
    {id:'12',firstname: 'Mishal', lastname: 'A'},
    {id:'133',firstname: 'Dex', lastname: 'T'},
    {id:'144',firstname: 'Rayan', lastname: 'K'},
    {id:'121',firstname: 'Riyya', lastname: 'R'}
  ];
  $scope.list.push({id:'1900',firstname: 'dummyElement', lastname: 'D'});      
});

<!DOCTYPE html>
<html>

<head>
    <script data-require="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e3828d84968f8293819090">[email protected]</a>" data-semver="1.5.5" src="https://code.angularjs.org/1.5.5/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
</head>

<body ng-app="app" ng-controller="BaseController">
    <h1>{{title}}</h1>

    <br/><br/> List:

    <br/><br/> {{list}}


</body>

</html>

Answer 3

Answer №2

// Here is the code snippet

var app = angular.module("app", []);

app.controller("BaseController", function($scope) { 
  $scope.title = "Angular.ForEach";
  $scope.list = [
    {id:'11',firstname: 'Joe', lastname: 'Michael'},
    {id:'12',firstname: 'Mishal', lastname: 'A'},
    {id:'133',firstname: 'Dex', lastname: 'T'},
    {id:'144',firstname: 'Rayan', lastname: 'K'},
    {id:'121',firstname: 'Riyya', lastname: 'R'}
  ];
   var count = 0;
   angular.forEach($scope.list, function(value, key){
    
    if($scope.list.length - 1 == count)
    {
      $scope.list.push({id:'1900',firstname: 'dummyElement', lastname: 'D'});
    }
    count++;
   });
   
});

<!DOCTYPE html>
<html>

  <head>
    <script data-require="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="11707f76647d70637b6251203f243f24">[email protected]</a>" data-semver="1.5.5" src="https://code.angularjs.org/1.5.5/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body ng-app="app" ng-controller="BaseController">
    <h1>{{title}}</h1>
    
    <br/><br/>
    List:
    
    <br/><br/>
    {{list}}
    
   
  </body>

</html>

Answer 4

// Here is the code snippet

var app = angular.module("app", []);

app.controller("BaseController", function($scope) { 
  $scope.title = "Angular.ForEach";
  $scope.list = [
    {id:'11',firstname: 'Joe', lastname: 'Michael'},
    {id:'12',firstname: 'Mishal', lastname: 'A'},
    {id:'133',firstname: 'Dex', lastname: 'T'},
    {id:'144',firstname: 'Rayan', lastname: 'K'},
    {id:'121',firstname: 'Riyya', lastname: 'R'}
  ];
   var count = 0;
   angular.forEach($scope.list, function(value, key){
    
    if($scope.list.length - 1 == count)
    {
      $scope.list.push({id:'1900',firstname: 'dummyElement', lastname: 'D'});
    }
    count++;
   });
   
});

<!DOCTYPE html>
<html>

  <head>
    <script data-require="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="11707f76647d70637b6251203f243f24">[email protected]</a>" data-semver="1.5.5" src="https://code.angularjs.org/1.5.5/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body ng-app="app" ng-controller="BaseController">
    <h1>{{title}}</h1>
    
    <br/><br/>
    List:
    
    <br/><br/>
    {{list}}
    
   
  </body>

</html>

Answer 5

Answer №3

After reviewing your plunker, I have made some modifications. Please take a look to see if it meets your requirements:

I noticed that you were using alert to display value[0].firstname. However, within the forEach loop, each value represents an individual value such as value[0],value[1], and so on for subsequent iterations at index 0, 1, etc. You can access the current values directly by using the 'value' keyword.

If you only need to add one dummy data element to your array, there is no need to loop through the entire array. You can simply utilize the push function to append another item to your list:

$scope.list = [
  {id:'11', firstname: 'Joe', lastname: 'Michael'},
  {id:'12', firstname: 'Mishal', lastname: 'A'},
  {id:'133', firstname: 'Dex', lastname: 'T'},
  {id:'144', firstname: 'Rayan', lastname: 'K'},
  {id:'121', firstname: 'Riyya', lastname: 'R'}
];
$scope.list.push({id:'1900', firstname: 'dummyElement', lastname: 'D'});

Here is the link to the updated code: https://plnkr.co/edit/CDWs6kuimwho4pc79I22?p=preview

Answer 6

After reviewing your plunker, I have made some modifications. Please take a look to see if it meets your requirements:

I noticed that you were using alert to display value[0].firstname. However, within the forEach loop, each value represents an individual value such as value[0],value[1], and so on for subsequent iterations at index 0, 1, etc. You can access the current values directly by using the 'value' keyword.

If you only need to add one dummy data element to your array, there is no need to loop through the entire array. You can simply utilize the push function to append another item to your list:

$scope.list = [
  {id:'11', firstname: 'Joe', lastname: 'Michael'},
  {id:'12', firstname: 'Mishal', lastname: 'A'},
  {id:'133', firstname: 'Dex', lastname: 'T'},
  {id:'144', firstname: 'Rayan', lastname: 'K'},
  {id:'121', firstname: 'Riyya', lastname: 'R'}
];
$scope.list.push({id:'1900', firstname: 'dummyElement', lastname: 'D'});

Here is the link to the updated code: https://plnkr.co/edit/CDWs6kuimwho4pc79I22?p=preview

Using angualr.forEach to append a placeholder element during iteration

Answer №1

Answer №2

Answer №3

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