Having trouble retrieving the $scope value in HTML, even though it was assigned within the success function of $http.post

Question

Having trouble retrieving the $scope value in HTML, even though it was assigned within the success function of $http.post

Having trouble accessing the values of $scope properties after a successful $http post in index.html file. Here is the code snippet for reference, any help in resolving this issue would be greatly appreciated as I am new to AngularJs

var app = angular.module('formExample', []);
app.controller("formCtrl", ['$scope','$rootScope', '$http',
function($scope,$rootScope, $http) {
    $scope.loginurl = 'loginsubmit.php';
    $scope.loginFormSubmit  = function(isValid) {           
        if (isValid) {

            $http.post($scope.loginurl, {"username": $scope.username,"password": $scope.password}).
                    success(function(data, status) {
                        $scope.status = status;
                        $scope.data = data;
                        $scope.isAdmin=data.isAdmin;
                        $scope.username=data.username;
                        location.href="Index.html";                         
                    })  
        } else {

              alert('Form is not valid');
        }

    }
 
 html form code

 <div class="row" ng-app="formExample" >
       <div ng-controller="formCtrl">
          <div class"col-md-8">&nbsp;</div>
          <div>username: {{$scope.username}} </div>

javascript angularjs angularjs-scope

Answer 1

Answer №1

When it comes to login and authentication, I follow a similar approach to Marco (as mentioned in his comment) by storing user information in $rootScope. However, I am cautious about overloading the $rootScope with unnecessary data.

To demonstrate this concept, I have created a simple jsfiddle playground inspired by an article I came across:

$rootScope-and-$scope.html

http://jsfiddle.net/chrislewispac/kd8v6thm/

var app = angular.module('myApp', []);

 app.controller('Ctrl1', function ($scope, $rootScope) {
 $scope.msg = 'World';
 $rootScope.name = 'AngularJS';
 });

 app.controller('Ctrl2', function ($scope, $rootScope) {
 $scope.msg = 'Dot Net Tricks';
 $scope.myName = $rootScope.name;
 });

I appreciate all the insightful answers and comments provided. As a learning tool, I recommend playing around with the provided fiddle to gain a better understanding. Personally, experimenting with small snippets of code in isolated environments has helped me learn and troubleshoot effectively.

UPDATE: Exploring alternative methods of data sharing across controllers in Angular:

In addition to utilizing $rootScope, creating an auth 'factory' is another efficient way to share data between controllers without relying on a database. Services and Factories serve as effective tools for facilitating data exchange among controllers, which aligns with best practices.

A comprehensive discussion on this topic (and others) can be found here: https://medium.com/opinionated-angularjs/techniques-for-authentication-in-angularjs-applications-7bbf0346acec

For a practical example featuring a service, please refer to the updated fiddle:

http://jsfiddle.net/chrislewispac/kd8v6thm/1/

Here is the additional content showcasing the implementation of a service:

app.service("auth", [ function () {
return {
    getAuth: function () {
        var info = {
            name: "Name",
            password: "Password"
            }
        return info;
        }
    };
}]);

Answer 2

When it comes to login and authentication, I follow a similar approach to Marco (as mentioned in his comment) by storing user information in $rootScope. However, I am cautious about overloading the $rootScope with unnecessary data.

To demonstrate this concept, I have created a simple jsfiddle playground inspired by an article I came across:

$rootScope-and-$scope.html

http://jsfiddle.net/chrislewispac/kd8v6thm/

var app = angular.module('myApp', []);

 app.controller('Ctrl1', function ($scope, $rootScope) {
 $scope.msg = 'World';
 $rootScope.name = 'AngularJS';
 });

 app.controller('Ctrl2', function ($scope, $rootScope) {
 $scope.msg = 'Dot Net Tricks';
 $scope.myName = $rootScope.name;
 });

I appreciate all the insightful answers and comments provided. As a learning tool, I recommend playing around with the provided fiddle to gain a better understanding. Personally, experimenting with small snippets of code in isolated environments has helped me learn and troubleshoot effectively.

UPDATE: Exploring alternative methods of data sharing across controllers in Angular:

In addition to utilizing $rootScope, creating an auth 'factory' is another efficient way to share data between controllers without relying on a database. Services and Factories serve as effective tools for facilitating data exchange among controllers, which aligns with best practices.

A comprehensive discussion on this topic (and others) can be found here: https://medium.com/opinionated-angularjs/techniques-for-authentication-in-angularjs-applications-7bbf0346acec

For a practical example featuring a service, please refer to the updated fiddle:

http://jsfiddle.net/chrislewispac/kd8v6thm/1/

Here is the additional content showcasing the implementation of a service:

app.service("auth", [ function () {
return {
    getAuth: function () {
        var info = {
            name: "Name",
            password: "Password"
            }
        return info;
        }
    };
}]);

Answer 3

Answer №2

To prevent losing the scope, consider setting a timeout on your location.href.

Prior to redirecting, there are various ways to ensure your user data is accessible throughout the app. You can store the user variables in a controller that impacts all views (such as a controller in app.js), or store them in $rootScope or localStorage/sessionStorage as recommended by @Marco in the comments.

Additionally, use {{ username }} instead of {{ $scope.username }}. The former will display the username while the latter will not output anything.

Answer 4

To prevent losing the scope, consider setting a timeout on your location.href.

Prior to redirecting, there are various ways to ensure your user data is accessible throughout the app. You can store the user variables in a controller that impacts all views (such as a controller in app.js), or store them in $rootScope or localStorage/sessionStorage as recommended by @Marco in the comments.

Additionally, use {{ username }} instead of {{ $scope.username }}. The former will display the username while the latter will not output anything.

Having trouble retrieving the $scope value in HTML, even though it was assigned within the success function of $http.post

Answer №1

Answer №2

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