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Infinite Scrolling using md-virtual-repeat in AngularJS Material

Andy Mummau
1#
Andy Mummau Published in 2018-01-13 00:03:56Z

I'm attempting to implement infinite scrolling as documented here: https://material.angularjs.org/latest/demo/virtualRepeat

However, all the examples I've found use $http.get to request an external .json document. I want to use an existing JSON array stored in a scope retrieved by another function within the controller. To simplify things for testing purposes, I created a plunkr that only performs the basics.

Here's a working example I found using an external .json file: http://plnkr.co/edit/e32qVQ4ECZBleWq2Gb2O?p=preview

All I should need to do is replace the $http.get request code with my $scope.items, but I have been unsuccessful in my attempts. Here's my modified example that I've been working off of: http://plnkr.co/edit/S2k6pxJ2mZ7MQsILnmvS?p=preview

(function () {
'use strict';
angular
  .module('infiniteScrolling', ['ngMaterial'])
  .controller('AppCtrl', function ($timeout,$scope) {
      $scope.items = [
{
"categoryId": "cat1",
"id": "pack0"
},
{
"categoryId": "cat1",
"id": "pack8"
},
{
"categoryId": "cat1",
"id": "pack9"
},
{
"categoryId": "cat1",
"id": "pack10"
},
{
"categoryId": "cat1",
"id": "pack11"
}
];


      // In this example, we set up our model using a plain object.
      // Using a class works too. All that matters is that we implement
      // getItemAtIndex and getLength.
       var vm = this;
      vm.infiniteItems = {
          numLoaded_: 0,
          toLoad_: 0,

          // Required.
          getItemAtIndex: function (index) {
              if (index > this.numLoaded_) {
                  this.fetchMoreItems_();
                  return null;
              }
              return this.items[index];
          },

          // Required.
          getLength: function () {
              return this.numLoaded_ + 5;
          },

          fetchMoreItems_: function ($scope, index) {
              if (this.toLoad_ < index) {
                  this.toLoad_ += 5;
                  $scope.items.then(angular.bind(this, function (obj) {
                      this.items = this.items.concat(obj.data);
                      this.numLoaded_ = this.toLoad_;
                  }));                  

                  }
          }
      };

   });
})();
shaunhusain
2#
shaunhusain Reply to 2018-01-13 05:21:36Z

http://plnkr.co/edit/GUvhluPx3bS2XUSjFHvN?p=preview

Since you are trying to replace a $http.get call which returns a promise you can just replace that with a $timeout (since this also returns a promise and will trigger an $apply). Only other caveat then is the object the $timeout returns doesn't have a data property (this is only a feature of the httppromise since it has http status etc.) so I had to also change obj.data to obj

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