Angular using $index in ng-model

Question

I have the following loop in which I'm trying to increment several fields based on the array index each time through the loop.

<div class="individualwrapper" ng-repeat="n in [] | range:4">
  <div class="iconimage"></div>
  <div class="icontext">
    <p>Imagine that you are in a health care facility.</p> 
    <p>Exactly what do you think this symbol means?</p>
    <textarea type="text" name="interpretation_1" ng-model="interpretation_1" ng-required="true"></textarea>
    <p>What action you would take in response to this symbol?</p>
    <textarea type="text" name="action_1" ng-model="action_1" ng-required="true"></textarea>  
  </div>
</div>

I'd like to do something similar to this"

ng-model="interpretation_{{$index + 1}}"

Angular is not rendering that value though? What would be the best way to go about adding this kind of logic in the mg-model field?

Answer 1

It becomes an invalid expression with the usage of interpolation with ng-model expression. You need to provide a property name there. Instead you can use an object and use bracket notation.

i.e in your controller:

$scope.interpretation = {};

and in your view use it as:

ng-model="interpretation[$index + 1]"

Demo

angular.module('app', []).controller('ctrl', function($scope) {
  $scope.interpretation = {};
  $scope.actions = {};
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.8/angular.min.js"></script>
<div ng-app="app" ng-controller="ctrl">
  {{interpretation}} {{actions}}
  <div class="individualwrapper" ng-repeat="n in [1,2,3,4]">
    <div class="iconimage">
    </div>
    <div class="icontext">
      <p>Imagine that you are in a health care facility.</p>
      <p>Exactly what do you think this symbol means?</p>
      <textarea type="text" ng-attr-name="interpretation{{$index + 1}}" ng-model="interpretation[$index+1]" ng-required="true"></textarea>
      <p>What action you would take in response to this symbol?</p>
      <textarea type="text" name="action{{$index + 1}}" ng-model="actions[$index+1]" ng-required="true"></textarea>
    </div>
  </div>
</div>