ng-repeat vs ng-options which is best for me

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i have to display the JSON data in drop down list ,for that i have two options one of the options is By using ng-repeat and other one is ng-options.

ng-repeat code :

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栀梦

2021-01-14 13:02

As far as performance is regarded, I think you should use your own directive that will handle it.

ng-options puts every element in $watch => gets really slow if the list contains hundreds elements

ng-repeat will be slow to be rendered.

You should then prefer using your own directive, and build your html into it

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时光说笑

2021-01-14 13:06

I think that ng-options, because that is meant to be used in cases like this.

Angularjs Docs:-

ngOptions provides an iterator facility for the element which should be used instead of ngRepeat when you want the select model to be bound to a non-string value. This is because an option element can only be bound to string values at present.

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孤城傲影

2021-01-14 13:14

The code below (also in Plunker) shows no difference even when the model is bound to a non-string value (an arithmetic code) except for the initialization where the approach with ng-repeat fails to display the default value (or maybe there's a workaround for that as well). After a value is chosen the behavior is the same:

<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 is: <tt>{{ctl.getSelectedFruit().label}}</tt> (from 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 is: <tt>{{ctl.getSelectedFruit().label}}</tt> (from 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>

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