"Unlocking the power of services in Angular: A comprehensive guide for my

Question

"Unlocking the power of services in Angular: A comprehensive guide for my

I need to store HTTP request data in one controller and access it from multiple controllers. Here is an example:

My services

angular.module('myApp').service('testService', ['Product','$q',
    function(Product, $q) {
        var products, targetProduct;
        var deferred = $q.defer();

        Product.query({
            Id: 123
            }, function(products) {
                targetProduct = products[0];
                deferred.resolve(products);
        })

        var getTargetProduct = function() {
            var deferredtwo = $q.defer();

            // return deferredtwo.promise;
            deferred.promise.then(function(){
                deferredtwo.resolve(targetProduct);
            })
            return deferredtwo.promise;
        }

        var setTargetProduct = function(targetProduct) {
                targetProduct = targetProduct
        }

        return {
            setTargetProduct: setTargetProduct,
            getTargetProduct: getTargetProduct,
            productPromise : deferred.promise
        };
    }
]);

nav controller

  testService.productPromise.then(function(products){
            $scope.products= products;
             $scope.targetProduct = products[0];
   })
  //when user click the project  ng-click = setTargetProduct(product);
  $scope.setTargetProduct = function(targetProduct) {
         testService.setTargetProduct(targetProduct)
   }

product detail controller

      testService.getTargetProduct().then(function(targetProduct) {
           // works when page first loads
           // but I don't know how to update the targetProduct when user select different             
           //targetProduct which means they trigger setTargetProduct() method
           $scope.targetProduct = targetProduct; 
      })

I am looking for a way to update the targetProduct in the product detail controller when the user selects another targetProduct. Can someone assist me with this? Thank you!

javascript angularjs service

Answer 1

Answer №1

Instead of using unnecessary promises in the function getTargetProduct, you can simplify it by just returning a promise wrapping your local data targetProduct:

var getTargetProduct = function() {
    return $q.when(targetProduct);
}

Note: For simplicity, I will refer to the service testService as productService, and the controller navController as ProductController

The NavController controller retrieves products like this :

productService.getProducts().then(function(products) {
    $scope.products = products;
}

When setting a target product (no changes):

$scope.setTargetProduct = function(targetProduct) {
   testService.setTargetProduct(targetProduct)
}

Solution 1: nested controllers

If ProductDetailController is nested within ProductController, the data targetProduct is shared without additional logic.

Solution 2: independent controllers

If the controllers are not related, you can use $broadcast to send an updateTargetProduct event, and $on to handle it.

In the controller where the target product is set:

$rootScope.$broadcast('updateTargetProduct', targetProduct);

And in ProductDetailController, listen for this event:

$scope.$on('updateTargetProduct', function(event, data) {
    // manipulate received data
}

Answer 2

Instead of using unnecessary promises in the function getTargetProduct, you can simplify it by just returning a promise wrapping your local data targetProduct:

var getTargetProduct = function() {
    return $q.when(targetProduct);
}

Note: For simplicity, I will refer to the service testService as productService, and the controller navController as ProductController

The NavController controller retrieves products like this :

productService.getProducts().then(function(products) {
    $scope.products = products;
}

When setting a target product (no changes):

$scope.setTargetProduct = function(targetProduct) {
   testService.setTargetProduct(targetProduct)
}

Solution 1: nested controllers

If ProductDetailController is nested within ProductController, the data targetProduct is shared without additional logic.

Solution 2: independent controllers

If the controllers are not related, you can use $broadcast to send an updateTargetProduct event, and $on to handle it.

In the controller where the target product is set:

$rootScope.$broadcast('updateTargetProduct', targetProduct);

And in ProductDetailController, listen for this event:

$scope.$on('updateTargetProduct', function(event, data) {
    // manipulate received data
}

Answer 3

Answer №2

Perhaps your circumstances differ from mine, but I created a custom $http service for my needs

var myService = angular.module('apix',[]);

myService.service('api',function( $http ){

        this.http = function( method , path , data ){

            return $http({
                method: method,
                url: path,
                headers: {                          
                    'Content-Type' :  'application/x-www-form-urlencoded'
                },
                data : jQuery.param(data)
            });
        }

});

and then used it like this:

 api.http('POST','your_path', data).success(function(result){ });

Answer 4

Perhaps your circumstances differ from mine, but I created a custom $http service for my needs

var myService = angular.module('apix',[]);

myService.service('api',function( $http ){

        this.http = function( method , path , data ){

            return $http({
                method: method,
                url: path,
                headers: {                          
                    'Content-Type' :  'application/x-www-form-urlencoded'
                },
                data : jQuery.param(data)
            });
        }

});

and then used it like this:

 api.http('POST','your_path', data).success(function(result){ });

Answer 5

Answer №3

angular.module('myApp', [])

.factory('ipFactory', ['$http',
  function($http) {
    var service = {
      getIp: function() {
        return $http.get('http://ip.jsontest.com/', {
            cache: true
          })
          .then(function(data) {
            return data.data.ip;
          });
      }
    }

    return service;
  }
])

.controller('ControllerOne', ['$scope', 'ipFactory',
  function($scope, ipFactory) {
    ipFactory.getIp()
      .then(function(ip) {
        $scope.ipAddress = ip;
      });
  }
])

.controller('ControllerTwo', ['$scope', 'ipFactory',
  function($scope, ipFactory) {
    ipFactory.getIp()
      .then(function(ip) {
        $scope.ipAddress = ip;
      });
  }
]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<body ng-app="myApp">
  <div ng-controller="ControllerOne">
    {{ipAddress}}
  </div>
  <div ng-controller="ControllerTwo">
    {{ipAddress}}
  </div>
</body>

Answer 6

angular.module('myApp', [])

.factory('ipFactory', ['$http',
  function($http) {
    var service = {
      getIp: function() {
        return $http.get('http://ip.jsontest.com/', {
            cache: true
          })
          .then(function(data) {
            return data.data.ip;
          });
      }
    }

    return service;
  }
])

.controller('ControllerOne', ['$scope', 'ipFactory',
  function($scope, ipFactory) {
    ipFactory.getIp()
      .then(function(ip) {
        $scope.ipAddress = ip;
      });
  }
])

.controller('ControllerTwo', ['$scope', 'ipFactory',
  function($scope, ipFactory) {
    ipFactory.getIp()
      .then(function(ip) {
        $scope.ipAddress = ip;
      });
  }
]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<body ng-app="myApp">
  <div ng-controller="ControllerOne">
    {{ipAddress}}
  </div>
  <div ng-controller="ControllerTwo">
    {{ipAddress}}
  </div>
</body>

"Unlocking the power of services in Angular: A comprehensive guide for my

Answer №1

Answer №2

Answer №3

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