login form in angular.js - angularjs

Question

I was trying to implement login form by authenticating the credentials from data stored in json file. But i'm getting error like only first case is working.It's just a demo application trying to learn the concepts:
this is my controller:
var app = angular.module('myApp', []);
app.controller("myCtrl",function($scope, $http)
{
$scope.check = function(){
var sample;
$http.get('roles.json').then(function(res)
{
sample = res.data;
console.log(sample);
angular.forEach(sample, function(val)
{
if($scope.uName===val.userName)
{
if($scope.password===val.password)
{
alert("sucess");
}
else
{
alert("failure");
}
}
else
{
alert("failure");
}
});
}); // end of http
};// end of function
});
data is loading properly but seems like some problem in logic.
data in json:
[
{"userName":"stud101","password":"stud1","role":"student"},
{"userName":"stud102","password":"stud2","role":"student"},
{"userName":"superlib","password":"lib1","role":"Librarian"}
]
I'm getting success only with first case, in rest other cases failure.

Answer 1

$http.get('roles.json').then(function(res){
sample = res.data;
console.log(sample);
var isMatched = false;
angular.forEach(sample, function(val)
{
if($scope.uName==val.userName && $scope.password==val.password)
{
isMatched = true;
return false; // To stop the foreach loop if username and password both are matched.
}
});
if(isMatched)
{
alert("success");
}
else
{
alert("failure");
}
});

Answer 2

angular.forEach($scope.messagepool, function(value, key) {
if(value.userName==$scope.uName && value.password==$scope.password){
alert('success');
}else{
alert('faluire');
}
});
Use this instead of your foreach . Hope this helps (y)