flash | Web Programming examples

(1)Rails controller

$ vi app/controllers/users_controller.rb

class UsersController < ApplicationController
  before_action :signed_in_user, only: [:update]

  private
    def signed_in_user
      remember_token = User.encrypt(cookies[:remember_token])
      current_user ||= User.find_by(remember_token: remember_token)
      if current_user.nil?
        render status: :unauthorized
      end
    end

(2)AngularJS controller

$ vi app/assets/javascripts/mymodule.js.erb

myModule.controller("UsersNewCtrl", function($scope, userResource, $location, flashService, $routeParams) {
  if ($routeParams.id) {
    if (flashService.getUser().user.id > 0 ) {
      var msg = "Profile updated";
      $scope.title = "Update your profile";
      $scope.btn_name = "Save changes";
      userResource.show({ id: $routeParams.id }, function(user_info) {
        $scope.user = user_info.user;
        $scope.gravatar_url = user_info.gravatar_url;
      })
    } else {
      var msg = "Please sign in.";
      flashService.push(msg);
      $location.path("/signin");
    }
  } else {

.........

(3)flash message

1)AngularJS template view

$ vi app/assets/templates/sessions/new.html.erb

<div ng-controller="SessionsNewCtrl" class="row">
  <div class="col-md-6 col-md-offset-3">
    <div class="bg-warning" ng-show="getMessage()">
      <p>{{getMessage()}}</p>
    </div>
    <h1 class="text-center">Sign in</h1>

2)AngularJS controller

$ vi app/assets/javascripts/mymodule.js.erb

myModule.controller("SessionsNewCtrl", function($scope, sessionResource,$location,flashService) {
  $scope.getMessage = function() {
    return flashService.get();
  };
});

(4)countermeasure of the browser reload

myModule.controller("UsersNewCtrl", function($scope, userResource, $location, flashService, $routeParams, sessionResource, $q) {
  var msg = "";
  var qgetUser = function(deferred) {
    if (flashService.getUser()) {
      var quser_info = flashService.getUser();
      deferred.resolve(quser_info);
    } else {
      sessionResource.current_user({}, function(response) {
        if (response.user.id) {
          var quser_info = response;
        } else {
          var quser_info = { user: {id: 0} };
        }
        flashService.setUser(quser_info);
        deferred.resolve(quser_info);
      });
    }
  }
  var deferred = $q.defer();
  deferred.promise.then(function (result) {
    var user_info = result;
    if ($routeParams.id) {
      if (user_info.user.id > 0) {
        msg = "Profile updated";
        $scope.title = "Update your profile";
        $scope.btn_name = "Save changes";
        userResource.show({ id: $routeParams.id }, function(user_info) {
          $scope.user = user_info.user;
          $scope.gravatar_url = user_info.gravatar_url;
        })
      } else {
        msg = "Please sign in.";
        flashService.push(msg);
        $location.path("/signin");
      }
    } else {
      msg = "Welcome to the Sample App!";
      $scope.title = "Sing up";
      $scope.btn_name = "Create my account";
      $scope.user = new userResource();
    }
  },function (reason) {
    console.log("qgetUser-Error");
  })
  qgetUser (deferred);

1)flash message with AngularJS

$ vi app/assets/javascripts/mymodule.js.erb

myModule.factory("flashService", function ($rootScope) {
  var queue = [];
  var currentMessage = "";

  $rootScope.$on("$routeChangeSuccess", function() {
    currentMessage = queue.shift() || "";
  });

  return {
    push: function (msg) {
      queue.push(msg);
    },
    get: function () {
      return currentMessage;
    }
  };
});

*routeChangeSuccess
ref.https://docs.angularjs.org/api/ngRoute/service/$route

2)AngularJS controller "UsersNewCtrl"

$ vi app/assets/javascripts/mymodule.js.erb

myModule.controller("UsersNewCtrl", function($scope, userResource, $location, flashService) {
  var msg = "Welcome to the Sample App!";
  $scope.user = new userResource();
  $scope.submit = function() {
    function success(response) {
      flashService.push(msg);
      $location.path("/users/" + response.id);
    }
    function failure(response) {
      console.log("failure", response)
    }
    userResource.create($scope.user, success, failure);
  };
});

3)AngularJS show view

1.show view

$ vi app/assets/templates/users/show.html.erb

<div ng-controller="UsersShowCtrl">
  <div class="row">
    <div class="bg-success" ng-show="getMessage()">
      <p>{{getMessage()}}</p>
    </div>
........

2.AngularJS controller "UsersShowCtrl"

$ vi app/assets/javascripts/mymodule.js.erb

myModule.controller("UsersShowCtrl", function($scope, $routeParams, userResource, flashService) {
  $scope.user = userResource.show({ id: $routeParams.id });
  $scope.getMessage = function() {
    return flashService.get();
  };
});

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