javascript - Custom filter in Angular -

i have problem custom filter. can't include it's in project. firstly used filter: text. understand array initialized asynchronously , used custom filter. when include filter, have problem ($injector:unpr). sorry english.

<div ng-controller="productlist products">       <form ng-submit="addproduct()">         <input type="text" placeholder="enter product" ng-model="producttitle">         <button>add</button>       </form>       <ul class="productlist">         <li ng-repeat="product in list track $index | custom:search">           {{product.title}}               </li>       </ul>        <input type="text" placeholder="search" ng-model="search"> </div> 

app here

angular.module('lists', [])   .controller('productlist', function($scope) {     $scope.list = [];     $scope.addproduct = function() {         $scope.list.push({title:$scope.producttitle});         $scope.producttitle = "";     }   }); 

and filter is

.filter('custom', function() {   return function(input, search) {     if (!input) return input;     if (!search) return input;     var expected = ('' + search).tolowercase();     var result = {};     angular.foreach(input, function(value, key) {       var actual = ('' + value).tolowercase();       if (actual.indexof(expected) !== -1) {         result[key] = value;       }     });     return result;   } }); 

i checked code , issue seems place filter being applied.
fiddle: http://jsfiddle.net/pfgkna8k/2/. though didn't know implementing.
please check code

<div ng-app="lists">     <div ng-controller="productlist products">           <form ng-submit="addproduct()">               <input type="text" placeholder="enter product" ng-model="producttitle" />             <button>add</button>           </form>           <ul class="productlist">             <li ng-repeat="product in list track $index" ng-bind="filteredtitle = (product.title  | custom: searchbox)" ng-show="filteredtitle">              </li>           </ul>         <input type="text" placeholder="search" ng-model="searchbox" />     </div> </div>