directive angularjs to check mail used or not -

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i want check if email used or not (communication back-end) error message not shown in screen.

the verficiation function service :

demoapp.factory('verifyemail', function($http) {     return function(mail) {         var test=mail;         var urll="http://localhost:8080/app/personne/verifmail?msg=";         var aplrest=urll+test;         var ch3=aplrest;          return $http.post(ch3)     };});

the directive (with of @jsonmurphy)

demoapp.directive('existto', ["$q","verifyemail",function ($q, verifyemail) {     return {         require: "ngmodel",         scope: {             othermodelvalue: "=existto"         },         link: function(scope, element, attributes, ngmodel) {             // note change $asyncvalidators here            <-------------             ngmodel.$asyncvalidators.existto = function(modelvalue) {                 var deferred = $q.defer();                 verifyemail(modelvalue).then(function(respons) {                     // respons can {exist="true"} or{exist="false"}                     var rep=respons.exist;                     deferred.resolve(rep);                 });                 return deferred.promise;             };             scope.$watch("othermodelvalue", function() {                 ngmodel.$validate();             });         }     }; }]);

the html file:

<label>email</label>     <input type="email" name="email" class="form-group"            ng-model="registration.user.email"            ng-pattern="/^[_a-z0-9]+(\.[_a-z0-9]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,8})$/"            required exist-to="registration.user.email"/>      <span style="color:red" ng-show="registrationform.email.$dirty && registrationform.email.$invalid">         <span ng-show="registrationform.email.$error.required">champs email obligatoire.</span>         <span ng-show="registrationform.email.$error.pattern">invalid email address.</span>         <span ng-show="registrationform.email.$error.existto">mail exist.</span>     </span>

this solution

demoapp.directive('existto', ["$q","verifyemail",function ($q, verifyemail) {     return {         require: "ngmodel",         scope: {             othermodelvalue: "=existto"         },         link: function(scope, element, attributes, ngmodel) {             // note change $asyncvalidators here            <-------------             ngmodel.$asyncvalidators.existto = function(modelvalue) {                 var deferred = $q.defer();                 // window.alert("l email tester "+modelvalue);                 verifyemail(modelvalue).success(function(respons) {                     // respons can {exist="true"} or{exist="false"}                   //  window.alert("la reponse " +respons);                     var rep=respons.exist;                    // window.alert("la reponse " +rep);                      if (rep =="false") {                         // username available                         deferred.resolve();                     } else {                         deferred.reject();                     }                  });                 return deferred.promise;             };             scope.$watch("othermodelvalue", function() {                 ngmodel.$validate();             });         }     }; }]);

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