javascript - Array of Inputs are passing as null in Angularjs -


i've form in i'm displaying values db through webapi. 1 of control having array of values. i've scenario user can edit , save it(put function).

controller : 

$scope.put= function () {        $scope.item1 = [];         $scope.item1 = $scope.cast.split(',');         var movie1 = {             _movieid: $scope.movid,             _title: $scope.movtitle,             _releasedate: $scope.movdate,             _rating: $scope.movrate,             _cast: $scope.item1         };         var result-= myservice.update($scope.movid, movie1);         result.then(function (pl) {             $scope.message = "updated successfuly";         }

html : 

<input type="text" ng-model="movid" class="spacebox" size="30" /> <br /> <input type="text" ng-model="movtitle" class="spacebox" size="30" /> <input type="text" ng-model="cast" class="spacebox" size="30" /> <input type="button" ng-value="edit" ng-click="enable()" style="margin-left: 250px; border-radius: 5px;" />

cast input array of string works perfect if user edit , save when try edit other fields id, title , proceed save without modifying casti'm getting error like
$scope.cast.split not function. why , how resolved.

ideally should define scope variables in controller .

$scope.movid = ''; $scope.movtitle= ''; $scope.cast = '';

i prefer creating context object hold scope variables . know why, read - http://www.thinkingmedia.ca/2015/01/learn-how-to-use-scopes-properly-in-angularjs/#use-data-objects-for-primitive-types

$scope.context = {    movid : '',    movietitle : '',    cast  : '' };

and html should -

<input type="text" ng-model="context.movid" class="spacebox" size="30" /> <br /> <input type="text" ng-model="context.movtitle" class="spacebox" size="30" /> <input type="text" ng-model="context.cast" class="spacebox" size="30" />

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