data binding - Dynamically update ion.rangeSlider ngModel in AngularJS directive

Question

I'm trying to update the value of an Ion.RangeSlider when its bound ng-model scope variable changes. The model updates when the Ion.RangeSlider is used, but not vice-versa. Other inputs with the same ng-model update when the model value changes, so this must be some special case.

Edit: Woo! Here's a snippet @lin :) Also jsfiddle.

var app = angular.module('ngModelIonRangeSliderDemo', []);

app.controller('MainCtrl', function ($scope, $rootScope, $timeout) {
    
    $scope.someNumber = 10;
    
}).directive('ionRangeSlider', function ionRangeSlider() {
   return {
      restrict: 'A',
      scope: {
         rangeOptions: '=',
         model: '=ngModel'
      },
      link: function (scope, elem, attrs) {
         scope.$watch('model',function () {
            elem.ionRangeSlider(scope.rangeOptions);
         });
      }
   }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.10/angular.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/1.1.2/ui-bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.1.6/js/ion.rangeSlider.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.1.6/css/ion.rangeSlider.min.css" />
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.1.6/css/ion.rangeSlider.skinFlat.min.css" />

<div ng-app="ngModelIonRangeSliderDemo">
    <div ng-controller="MainCtrl" class="wrapper">
       <h3>Text input updates slider, but not vice-versa.</h3>
       <input ion-range-slider ng-model="someNumber" range-options="{min: -100, max: 100, step: .001}">
       <br/>
       <input type="text" ng-model="someNumber" class="form-control">
    </div>
</div>

Answer 1

Just use slider.update() inside your directive and you will be fine:

var app = angular.module('myApp', []);

app.controller('MainCtrl', function ($scope, $rootScope, $timeout) {

    $scope.someNumber = 15;
    $scope.apply = false;

}).directive('ionRangeSlider', function ionRangeSlider() {
   return {
      restrict: 'A',
      scope: {
         rangeOptions: '=',
         model: '=ngModel',
         apply: '=apply'
      },
      link: function (scope, elem, attrs) {
         elem.ionRangeSlider(scope.rangeOptions);
         scope.$watch('apply',function () {
          if (scope.apply) {
            scope.apply = false;
            var slider = elem.data("ionRangeSlider");            
            slider.update({
               from: scope.model
            });
          }
         });
      }
   }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.10/angular.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/1.1.2/ui-bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.1.6/js/ion.rangeSlider.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.1.6/css/ion.rangeSlider.min.css" />
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.1.6/css/ion.rangeSlider.skinFlat.min.css" />

<div ng-app="myApp" ng-controller="MainCtrl" class="wrapper">
  <h3>Text input updates slider and vice-versa.</h3>
  <input ion-range-slider ng-model="someNumber" apply="apply" range-options="{min: -100, max: 100, step: .001}">
  <br/>
  <input type="text" ng-model="someNumber" class="form-control" ng-change="apply = true">
</div>