Having trouble with filtering the array retrieved from Firebase in Angular?

This is the html:

    <div ng-controller="FilterController as ctrl">
      <div>
    All entries:
    <span ng-repeat="entry in ctrl.array">{{entry.from}} </span>
  </div>
  <div>
    Entries that contain an "a":
    <span ng-repeat="entry in ctrl.filteredArray">{{entry.from}} </span>
  </div>
</div>

This is my script:

angular.module('myApp', ["firebase"]).
  controller('FilterController', ['filterFilter', '$firebase', function(filterFilter,       $firebase) {
   var ref = new Firebase("https://******.firebaseio.com/");
   this.array = $firebase(ref).$asArray();
   this.filteredArray = filterFilter(this.array, 'a');
  }]);

The result from filteredArray seems to be empty. I'm puzzled as to what I may have done incorrectly. Any suggestions or insights are greatly appreciated.

Answer №1

Understanding asynchronous data loading is crucial in JavaScript. Before diving into Angular and Firebase, it's important to grasp the concept of async operations.

Your filter function may be executing before the server request is completed, resulting in an empty array. To solve this issue, consider using the $loaded method to ensure all initial data is downloaded before proceeding.

While $loaded can provide a solution, keep in mind that filtered results will remain static instead of real-time. It's recommended to leverage Angular and Firebase's capabilities by moving such logic to the view layer instead of handling it in code directly:

<li ng-repeat="item in array | filter:searchText" />

If you find yourself manipulating arrays within controllers, consider utilizing $extendFactory or simply binding the data to scope and allowing Angular to handle the heavy lifting.

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