angularjs - Angular validator makes my $scope unavailable? -


i've simple input in html page :

<input type="text" class='form-control' id='card' name="mycard" ng-model='form.cardnb' card-validation>

i created function 'cadtype' returns value according first char in input :

var mainapp = angular.module("mainapp", []);          mainapp.controller('formcontroller', function($scope) {            $scope.form = {               cardnb: "",               nameoncard: "",               expirydate: "",               cvv:  "",               cardtype: function() {                  var firstcharcard;                  var secondcharcard;                  firstcharcard = $scope.form.cardnb.charat(0);                  secondcharcard = $scope.form.cardnb.charat(1);              //some additional logic here...

(function works fine @ moment , no problem)

then, created new validator validation on input :

    mainapp.directive('cardvalidation', function() {     return {          require: 'ngmodel',          link: function($scope, element, attributes, ngmodel) {             ngmodel.$validators.cardvalidation = function(value) {                   return (value.length == 13);             };         }     } });

this validation works function doesn't work anymore ! error when filling input :

typeerror: cannot read property 'charat' of undefined     @ object.$scope.form.cardtype (index.html:86)     @ ib.functioncall (angular.js:12404)     @ object.<anonymous> (angular.js:12813)     @ n.$get.n.$digest (angular.js:14300)     @ n.$get.n.$apply (angular.js:14571)     @ eg.$$debounceviewvaluecommit (angular.js:23391)     @ eg.$setviewvalue (angular.js:23363)     @ htmlinputelement.l (angular.js:19784)     @ htmlinputelement.c (angular.js:3032)

i suppose validation makes unavailable scope ... can ?

thanks lot :).

how validators work create model if validation fails.

in case if length not 13 underlying model cleared form.cardnb.

so in function should explicitly check cardnb not null before using charat.


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