angularjs - How to restrict from duplicate text field before pusing into array using Angular JS? -


i want restrict user create new text box , echo error message , if he/she inputs same value in previous text field. therefore create new text box if text fields has different values.

html

<input type="text" ng-model="set.values"/> <span ng-show="message"> please enter different value </span>

angularjs

$scope.set = { values: [] }; $scope.message = false;   $scope.add = function (){     $scope.message = false;      $scope.set.values.push('');  }

you can use indexof , $watch. watch ng-model value change , check if value exists in array, if throw error.

html

<input type="text" ng-model="set.val"/> <span ng-show="message"> please enter different value </span>

js

$scope.set = {      values: []  }; //array contains previous ng-model values  $scope.message = false;  $scope.$watch('set.val', function(val) {      if (val != undefined) var index = $scope.set.values.indexof(val);      if (index > -1) $scope.message = true;      else {          $scope.message = false;          $scope.set.values.push(val);          //add new input logic      }  })

update

if want check happen after clicking add button(which assume present in ui)

$scope.set = {     values: [] //array contains previous ng-model values }; $scope.add = function() {     var index = $scope.set.values.indexof($scope.set.val);     if (index > -1) $scope.message = true;     else {         $scope.message = false;         $scope.set.values.push($scope.set.val);         //add new input logic     } }

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