Add dynamic id to option in ng-options

Question

Is it possible to add a dynamic attribut id to an option, when I use ng-options in a select to loop my list and generate my dropdown? It works, if I use an ng-repeat loop, because there I can put the attribut id directly in the option tag an increment it with $index. Is this also possible with ng-options? Here is my code:

angular.module("myApp", []).controller("myController", function($scope) {
  $scope.selectedOption1;
  $scope.selectedOption2;

  $scope.myList = [{
    text: "1"
  }, {
    text: "2"
  }, {
    text: "3"
  }, {
    text: "4"
  }, {
    text: "5"
  }, ];
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="myApp" ng-controller="myController">
  <!--BUILD DROPDOWN WITH NG-OPTIONS LOOP-->
  <select ng-model="selectedOption" ng-options="option as option.text for option in myList"></select>

  <!--BUILD DROPDOWN AND SET ATTRIBUT ID WITH NG-REPEAT LOOP-->
  <select ng-model="selectedOption2">
    <option id="option_{{$index}}" ng-repeat="option in myList">{{option.text}}</option>
  </select>
</div>

Screenshot of both select (red border are the id's):

Any ideas? Thanks.

Answer 1

You can use the track by option :

<select ng-model="selectedOption" ng-options="obj.text for obj in myList track by obj.value">

But then, you have to modify your object a little bit :

$scope.myList = [{
    text: "1",
    value: "option_1"
}, {
    text: "2",
    value: "option_2"
}, {
    text: "3",
    value: "option_3"
}, {
    text: "4",
    value: "option_4"
}, {
    text: "5",
    value: "option_5"
}, ];

This should do the trick.

EDIT The plunker to test it

EDIT 2 For those who want a fast answer, you also can do this :

<select ng-model="selectedOption" ng-options="obj.text for obj in myList track by option + obj.text">

And in the js file add :

$scope.option = 'option_';
$scope.myList = [{
    text: "1"
}, {
    text: "2"
}, {
    text: "3"
}, {
    text: "4"
}, {
    text: "5"
}, ];