javascript - How to assign varaible in ng-model on input based on condition -

i want assign ng-model variable based on condition. example:

<input type="text" ng-model="item.model[multilang]" > 

$scope.multilang can "eng","jp"(languages) or false. example, if multilang = "eng" , user type in input "hello",the result

item.model = {eng:"hello"} 

the problem when $scope.multilang = false , want result be

item.model = "hello" 

i can't find way achieve above result. think 1 solution changing ng-model based on $scope.multilang when it's false,it change ng-model of input = ng-model="item.model" don't know how this.

edited thought of 1 solution:

<input ng-if="multilang" type="text" ng-model="item.model[multilang]" > <input ng-if="!multilang" type="text" ng-model="item.model" > 

but there better way achieve ?

-----plnkr example-----

angular flexible , powerful framework. should use custom directive , ngmodel's getter/setter option.

directive without ngmodel's getter/setter may this:

<input type="text"         ng-model="val"         multilang="multilang"         multilang-model="item.model"> 

directive code:

 .directive('multilang', [function(){      return {        restrict: "a",        require: "ngmodel",        scope: {         multilang: "=",         multilangmodel: "="       },        link: function(scope, element, attr, ngmodel){          ngmodel.$viewchangelisteners.push(function()){            var value = ngmodel.$modelvalue;            if(scope.multilang !== false) {              if(typeof scope.multilangmodel == 'undefined')               scope.multilangmodel = object.create(null)              scope.multilangmodel[scope.multilang] = value            }            else {               scope.multilangmodel = value            }         })       }     }  }]) 

--forked plunkr--

in case of using ngmodel's getter/setter

<input type="text"         ng-model="val"         multilang="multilang"         multilang-model="item.model"         ng-model-options="{ gettersetter: true }"> 

directive code:

 .directive('multilang', [function(){      return {        restrict: "a",        scope: {         multilang: "=",         multilangmodel: "=",         val: "=ngmodel"       },        link: function(scope, element, attr){          scope.val = function(newvalue) {            if(scope.multilang !== false) {              if(typeof scope.multilangmodel == 'undefined')               scope.multilangmodel = object.create(null)                              return arguments.length ? (scope.multilangmodel[scope.multilang] = newvalue) : scope.multilangmodel[scope.multilang];            }            else {               return arguments.length ? (scope.multilangmodel = newvalue) : scope.multilangmodel;            }         }       }     }  }]) 

--forked plunkr--

in opinion, second 1 better. has 2 way binding item.model , changes input value when item.model changed in other place of code.