javascript - Angular JS, search/filter by many fields on input -

i trying implement code found application : http://jsfiddle.net/8peax/42/

with no success. demo works on site if ammend suit app gives error when searching 'angular.lowercase(...).indexof not function'

please see sample code below:

html:

<p><label>filter</label><input data-ng-model="phonefilter.$" type="text">  </p> <ul>     <li data-ng-repeat="customer in customers | filter:phonefilter:multiplechoicescomparator">         {{customer.name }} {{customer.lastname}}     </li> </ul>                     </p> 

controller:

var customercontroller = function ($scope, customerservice, $log, $routeparams, $location, $sce) {     var customer = function (data) {         $scope.customer = data;         $log.info(data);      };   $scope.multiplechoicescomparator = function (expected, actualincompactform)     {     var listactual = actualincompactform.split(' ');     var mustbeincluded = false;      angular.foreach(listactual, function (actual)     {        if (angular.lowercase(expected).indexof(angular.lowercase(actual)) !== -1)         {             mustbeincluded = true;         }     });      return mustbeincluded;      }; 

can assist. example seems search random input in order , produce results. add src html cater new function?