What is the best way to assign a distinct identifier to every ng-model within an ng-repeat loop?

Question

What is the best way to assign a distinct identifier to every ng-model within an ng-repeat loop?

I am encountering an issue with my page that includes multiple AngularUI sliders and a span displaying the value of each slider using ng-bind. The structure looks similar to this:

   <div class="formitem" ng-repeat="food in foodlist" >
     <div ui-slider="{range: 'min'}" min="0" max="{{ unit.max }}" ng-model="demoVals.slider" class="food-slider" >
      <div class="begin">1</div>
      <div class="end"> {{ unit.max }} {{ food.uid }}  </div>
    </div>
    <span ng-bind="demoVals.slider"></span>
   </div>

I am aiming to make the ng-model unique for each food item, utilizing something like demoVals.slider57, where 57 is derived from {{ food.uid }}. While I can successfully display {{ food.uid }} in the template, trying to integrate it into ng-model or ng-bind yields results like this:

 ng-model="demoVals.slider[food.uid]"

How can I effectively incorporate the food.uid into the ng-model for each food item?

javascript angularjs

Answer 1

Answer №1

It may not be the most effective architectural decision to use individual elements instead of an array when dealing with slider values. Consider transitioning to storing your slider values in an array for better organization and efficiency.

If you're set on using individual elements, you can create a controller function to achieve your desired outcome, although it may not be the most visually appealing solution. Utilize the ng-repeat directive to bind to a function like so:

<div ng-bind="test(food.uid)"></div>

The corresponding function would look like this:

$scope.test = function test(v) {
        var t = $scope.$eval("demoVals.slider" + v);
        return t;
      };

Answer 2

It may not be the most effective architectural decision to use individual elements instead of an array when dealing with slider values. Consider transitioning to storing your slider values in an array for better organization and efficiency.

If you're set on using individual elements, you can create a controller function to achieve your desired outcome, although it may not be the most visually appealing solution. Utilize the ng-repeat directive to bind to a function like so:

<div ng-bind="test(food.uid)"></div>

The corresponding function would look like this:

$scope.test = function test(v) {
        var t = $scope.$eval("demoVals.slider" + v);
        return t;
      };

Answer 3

Answer №2

If you want to include a food.uid property in demoVals during each iteration, you will need to run some JavaScript code for each iteration. This task can only be accomplished (in my opinion) using a directive.

To see it in action, check out this functioning Plunker.

The following is how you should adjust your HTML by adding the repeat-directive as shown below:

<div class="formitem" ng-repeat="food in foodlist" repeat-directive>
 <div ui-slider="{range: 'min'}" min="0" max="{{ unit.max }}" ng-model="demoVals.slider" class="food-slider" >
  <div class="begin">1</div>
  <div class="end"> {{ unit.max }} {{ food.uid }}  </div>
</div>
<span ng-bind="demoVals.slider"></span>

Additionally, here is the code for the directive that will be executed for every iteration:

var app = angular.module('plunker', [])
             .directive ('repeatDirective',function () {
                                           return {
                                              restrict: 'A',
                                              link: function (scope, element, attr) {
                                                console.log('linking directive ',scope.demoVals)
                                                 if (scope.food){
                                                   // you have a value for food
                                                   // you can add it as an attribute to demoVals
                                                   scope.demoVals['prop'+scope.food.uid] = scope.food.name;
                                                 }}
                                           }
                                          });

Answer 4

If you want to include a food.uid property in demoVals during each iteration, you will need to run some JavaScript code for each iteration. This task can only be accomplished (in my opinion) using a directive.

To see it in action, check out this functioning Plunker.

The following is how you should adjust your HTML by adding the repeat-directive as shown below:

<div class="formitem" ng-repeat="food in foodlist" repeat-directive>
 <div ui-slider="{range: 'min'}" min="0" max="{{ unit.max }}" ng-model="demoVals.slider" class="food-slider" >
  <div class="begin">1</div>
  <div class="end"> {{ unit.max }} {{ food.uid }}  </div>
</div>
<span ng-bind="demoVals.slider"></span>

Additionally, here is the code for the directive that will be executed for every iteration:

var app = angular.module('plunker', [])
             .directive ('repeatDirective',function () {
                                           return {
                                              restrict: 'A',
                                              link: function (scope, element, attr) {
                                                console.log('linking directive ',scope.demoVals)
                                                 if (scope.food){
                                                   // you have a value for food
                                                   // you can add it as an attribute to demoVals
                                                   scope.demoVals['prop'+scope.food.uid] = scope.food.name;
                                                 }}
                                           }
                                          });

What is the best way to assign a distinct identifier to every ng-model within an ng-repeat loop?

Answer №1

Answer №2

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