Which one should I use: ng-repeat or ng-options?

Question

Which one should I use: ng-repeat or ng-options?

I am looking to display JSON data in a dropdown list, and I have two options to choose from. The first option is using ng-repeat, while the other option is ng-options.

Using ng-repeat:

In the HTML file:

<select>
<option ng-repeat="prod in testAccounts" value="{{prod.id}}">{{prod.name}}</option>
</select>

In the script file:

$http.get('document.json').success(function (data) 
{
    $scope.testAccounts = angular.fromJson(data);
 }

The second option is ng-options:

In the HTML file:

<select ng-model="selectedTestAccount" ng-options="c as c.name for c in testAccounts1"></select>

In the script file:

$http.get('document.json').success(function (data) 
{
    $scope.testAccounts1 = data;
    $scope.selectedTestAccount = $scope.testAccounts1[0];
}

Now I need to determine which method would be best for my project in terms of performance improvement. Any guidelines or suggestions are welcome.

javascript json angularjs angularjs-ng-repeat angularjs-ng-options

Answer 1

Answer №1

In my opinion, ng-options is the way to go in situations like this.

Check out the AngularJS documentation for more information.

ngOptions offers a convenient way to iterate through options for the select element, especially when you need to bind the select model to a non-string value. This is necessary because option elements can currently only be bound to string values.

Answer 2

In my opinion, ng-options is the way to go in situations like this.

Check out the AngularJS documentation for more information.

ngOptions offers a convenient way to iterate through options for the select element, especially when you need to bind the select model to a non-string value. This is necessary because option elements can currently only be bound to string values.

Answer 3

Answer №2

When it comes to efficiency, I suggest creating a custom directive to manage it.

If the list is extensive, using ng-options can lead to slow performance due to every element being watched.

Rendering with ng-repeat may also cause delays.

To optimize performance, consider developing your own directive and embedding your HTML within it.

Answer 4

When it comes to efficiency, I suggest creating a custom directive to manage it.

If the list is extensive, using ng-options can lead to slow performance due to every element being watched.

Rendering with ng-repeat may also cause delays.

To optimize performance, consider developing your own directive and embedding your HTML within it.

Answer 5

Answer №3

The following code snippet, also available on Plunker, demonstrates that there is no noticeable difference even when the model is associated with a non-string value (like an arithmetic code), except during initialization where using ng-repeat does not display the default value. However, this issue may have a workaround. Once a value has been selected, both approaches behave similarly:

<html>
  <head>
    <title>Making Choices</title>
    <script src='https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular.min.js'></script>
  </head>
  <body ng-app='theApp' ng-controller='TheController as ctl'>
    <div ng-controller='TheController as ctl'>
      Select your favorite fruit:
      <select ng-model='ctl.selectedFruitCode'>
        <option ng-repeat='fruit in ctl.fruits' ng-value='fruit.code'>{{fruit.label}}</option>
      </select>
      <br/>
      Selected fruit: <tt>{{ctl.getSelectedFruit().label}}</tt> (code: {{ctl.selectedFruitCode}})
    </div>
    <hr>
    <div ng-controller='TheController as ctl'>
      Select your favorite fruit:
      <select ng-model='ctl.selectedFruitCode'
              ng-options='c.code as c.label for c in ctl.fruits'>
      </select>
      <br/>
      Selected fruit: <tt>{{ctl.getSelectedFruit().label}}</tt> (code: {{ctl.selectedFruitCode}})
    </div>
    <script type='text/javascript'>
     angular.module('theApp', [])
            .controller('TheController', [function() {
              var self = this;
              self.fruits = {};
              self.fruits = [{label: 'Apples'   , code:0},
                             {label: 'Bananas'  , code:1},
                             {label: 'Peach'    , code:2},
                             {label: 'Apricot'  , code:3}];
              self.selectedFruitCode = self.fruits[0].code;
              self.getSelectedFruit = function() {
                for (var i = 0 ; i < self.fruits.length ; i++) {
                  if (self.fruits[i].code==self.selectedFruitCode)
                    return self.fruits[i];
                }
              };
            }]);
    </script>
  </body>
</html>

Answer 6

The following code snippet, also available on Plunker, demonstrates that there is no noticeable difference even when the model is associated with a non-string value (like an arithmetic code), except during initialization where using ng-repeat does not display the default value. However, this issue may have a workaround. Once a value has been selected, both approaches behave similarly:

<html>
  <head>
    <title>Making Choices</title>
    <script src='https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular.min.js'></script>
  </head>
  <body ng-app='theApp' ng-controller='TheController as ctl'>
    <div ng-controller='TheController as ctl'>
      Select your favorite fruit:
      <select ng-model='ctl.selectedFruitCode'>
        <option ng-repeat='fruit in ctl.fruits' ng-value='fruit.code'>{{fruit.label}}</option>
      </select>
      <br/>
      Selected fruit: <tt>{{ctl.getSelectedFruit().label}}</tt> (code: {{ctl.selectedFruitCode}})
    </div>
    <hr>
    <div ng-controller='TheController as ctl'>
      Select your favorite fruit:
      <select ng-model='ctl.selectedFruitCode'
              ng-options='c.code as c.label for c in ctl.fruits'>
      </select>
      <br/>
      Selected fruit: <tt>{{ctl.getSelectedFruit().label}}</tt> (code: {{ctl.selectedFruitCode}})
    </div>
    <script type='text/javascript'>
     angular.module('theApp', [])
            .controller('TheController', [function() {
              var self = this;
              self.fruits = {};
              self.fruits = [{label: 'Apples'   , code:0},
                             {label: 'Bananas'  , code:1},
                             {label: 'Peach'    , code:2},
                             {label: 'Apricot'  , code:3}];
              self.selectedFruitCode = self.fruits[0].code;
              self.getSelectedFruit = function() {
                for (var i = 0 ; i < self.fruits.length ; i++) {
                  if (self.fruits[i].code==self.selectedFruitCode)
                    return self.fruits[i];
                }
              };
            }]);
    </script>
  </body>
</html>

Which one should I use: ng-repeat or ng-options?

Answer №1

Answer №2

Answer №3

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