I need translate value factory. this factory receive translateData from server. and angular controller call convertValue function. but $http is async method so controller get undefined value. because http response not yet received.
I wonder that I can factory initialize complete(= download data from server) and create controller sequentially.
angular.module("app")
.factory("service", function ($http) {
var allDataMap = {};
$http({
method: 'GET',
url: '/data'
}).then(function (response) {
angular.forEach(response.data.datas, function (value) {
allDataMap[value.key] = value.value;
});
});
return {
convertValue: function (key) {
return key + '(' + allDataMap[key] + ')';
},
};
});
You're thinking of async call to be accomplish in sync way. That won't happen, you have to wait until the ajax call is done, you can easily make this happen using promise.
angular.module("app")
.factory("service", function ($http) {
var allDataMap = {};
// create a promise
var promise = $http({
method: 'GET',
url: '/data'
}).then(function (response) {
angular.forEach(response.data.datas, function (value) {
allDataMap[value.key] = value.value;
});
return allDataMap;
});
return {
convertValue: function (key) {
// wait until promise finish
return promise.then(function() {
return key + '(' + allDataMap[key] + ')';
});
},
};
});
This question is related to another one.
Before I did added $ionicPlatform, my service working just fine, but now there is something wrong with $http.
Here is example of injectables:
(function () {
"use strict";
angular.module('service', ['ionic'])
.service('BBNService', ["$http", "$localStorage", "$ionicPlatform",
function ($http, $localStorage, $ionicPlatform) {
And using of $http and $ionicPlatform
this.tips = function () {
var url;
$ionicPlatform.ready(function () {
if (window.Connection) {
if (navigator.connection.type == Connection.CELL_4G || navigator.connection.type == Connection.WIFI) {
if (this.getDayId = 0)//If Sunday - retrieve updated tips
url = this.host + "/tips/";
else
url = "data/tips.json";//If not - use saved data
}
}
});
var request = $http({
method: "GET",
url: url
}).then(
function mySucces(response) {
return response.data;
},
function myError(response) {
return response.data;
});
return request;
};
You need to send back the promise, doing a return response.data is not gonna work.
var deferred = $q.defer();
var request = $http({
method: "GET",
url: url
}).then(
function mySucces(response) {
deferred.resolve(response.data);
},
function myError(response) {
deferred.reject(response.data);
});
return deferred.promise;
And at the place where you consume this service:
BBNService.tips().then(
function(data) { //success call back with data },
function(data) { //error call back with data }
);
Please let me know if you need more explanation on using $q; always happy to give more details.
here is my javascript code
$scope.addUser = function () {
debugger;
url = baseURL + "AddUser";
$scope.objUser = [];
$scope.objUser.push( {
"ID": '0',
"UserName": $scope.txtUserName,
"Password": $scope.txtPassword,
"Role":"Non-Admin"
});
$http.post(url,$scope.objUser[0])
.success(function (data) {
debugger;
alert("S");
window.location = "../View/Login.html";
}).error(function () {
debugger;
alert("e");
});
}
here is my server method code
[HttpPost]
public int AddUser(UserModel user)
{
//_entity.Configuration.ProxyCreationEnabled = false;
tblUser objUser = new tblUser();
objUser.UserName = user.UserName;
objUser.Password = user.Password;
objUser.Role = user.Role;
_entity.tblUsers.Add(objUser);
_entity.SaveChanges();
return objUser.ID;
}
You can use promises to get the response. this can be inside into a service and call it whenever you want to use it.
this.addUser = function (obj) {
var datosRecu = null;
var deferred = $q.defer();
var uri = baseUrl + 'addUser';
$http({
url: uri,
method: 'post',
data: angular.toJson(obj)
}).then(function successCallback(response) {
datosRecu = response;
deferred.resolve(datosRecu);
}, function errorCallback(response) {
datosRecu = response;
deferred.resolve(datosRecu);
});
return deferred.promise;
};
Also .error and .success are deprecated.
PD: the parameter data: inside the $http correspond to the body. if you want to send parameters you should use params:{}
EDIT:
Here i leave you a link how promises work. Angular promises
Basically this helps to process data asynchronously
the example above can be used inside a service like this
myApp.service('myService', function($q, $http){
// here your services....
});
the service can be injected inside to any controller to provide the data that what you want, inside of your functions
myApp.controller('myController', function($scope, myService){
$scope.list = function(){
$promise = myService.getAll(); // this will be the name of your function inside your servive
$promise.then(function(data){
console.log(data); //here you can se your promise with data like status and messages from the server.
});
};
});
Hope it helps.
var app = angular.module('app', ['ngResource']);
app.factory('UserFactory', function ($resource) {
return $resource('/com/vsoft/rest/users', {}, {
query: {
method: 'GET',
params: {},
isArray: false
}
});
});
app.controller('MyCtrl1', ['$scope', 'UserFactory', function ($scope, UserFactory) {
UserFactory.get({}, function (userFactory) {
$scope.firstname = userFactory.firstName;
$scope.lastname = userFactory.lastName;
});
});
}]);
i added above app in my html.But the app and angular-resource.js but my app.js is not exeuting.
If i removed ngResource module and $resource alert is coming.But if i used ngResource im nt getting alert.
Please help in this.If any one knows any Good Example to use Restful services with angularjs .Please Kindly send Url or code.
Please help me.
i called{{firstname}}
in my html but its not coming .
I use a service for handling RESTful messages
app.service('restService', function ($http, $log) {
'use strict';
var self = this;
var BASE_URL = "base/url/";
//First way how to do it
self.httpGet = function (url) {
$log.info("HTTP Get", url);
return postProcess($http({method: 'GET', url: BASE_URL + url}));
};
//Second way how to do it
self.httpPut = function (url, object) {
$log.info("HTTP Put", url);
return postProcess($http.put(BASE_URL + url, object));
};
self.httpPost = function (url, object) {
$log.info("HTTP Post", url);
return postProcess($http.post(BASE_URL + url, object));
};
self.httpDelete = function (url) {
$log.info("HTTP Delete", url);
return postProcess($http.delete(BASE_URL + url));
};
function postProcess(httpPromise) {
return httpPromise.then(function (response) {
if (response.status === 200) {
return response;
}
//Other than 200 is not ok (this is application specific)
failure(response);
}, function (response) {
failure(response);
});
}
/**
* Promise for failure HTTP codes
* #param response the HTTP response
*/
function failure(response) {
//Error handling
}
});
usable as
restService.httpGet("categories").then(function (response) {
categoryData = angular.fromJson(response.data);
//Broadcast an event to tell that the data is ready to be used
$rootScope.$broadcast("categoriesReady");
});
Given a Ajax request in AngularJS
$http.get("/backend/").success(callback);
what is the most effective way to cancel that request if another request is launched (same backend, different parameters for instance).
This feature was added to the 1.1.5 release via a timeout parameter:
var canceler = $q.defer();
$http.get('/someUrl', {timeout: canceler.promise}).success(successCallback);
// later...
canceler.resolve(); // Aborts the $http request if it isn't finished.
Cancelling Angular $http Ajax with the timeout property doesn't work in Angular 1.3.15.
For those that cannot wait for this to be fixed I'm sharing a jQuery Ajax solution wrapped in Angular.
The solution involves two services:
HttpService (a wrapper around the jQuery Ajax function);
PendingRequestsService (tracks the pending/open Ajax requests)
Here goes the PendingRequestsService service:
(function (angular) {
'use strict';
var app = angular.module('app');
app.service('PendingRequestsService', ["$log", function ($log) {
var $this = this;
var pending = [];
$this.add = function (request) {
pending.push(request);
};
$this.remove = function (request) {
pending = _.filter(pending, function (p) {
return p.url !== request;
});
};
$this.cancelAll = function () {
angular.forEach(pending, function (p) {
p.xhr.abort();
p.deferred.reject();
});
pending.length = 0;
};
}]);})(window.angular);
The HttpService service:
(function (angular) {
'use strict';
var app = angular.module('app');
app.service('HttpService', ['$http', '$q', "$log", 'PendingRequestsService', function ($http, $q, $log, pendingRequests) {
this.post = function (url, params) {
var deferred = $q.defer();
var xhr = $.ASI.callMethod({
url: url,
data: params,
error: function() {
$log.log("ajax error");
}
});
pendingRequests.add({
url: url,
xhr: xhr,
deferred: deferred
});
xhr.done(function (data, textStatus, jqXhr) {
deferred.resolve(data);
})
.fail(function (jqXhr, textStatus, errorThrown) {
deferred.reject(errorThrown);
}).always(function (dataOrjqXhr, textStatus, jqXhrErrorThrown) {
//Once a request has failed or succeeded, remove it from the pending list
pendingRequests.remove(url);
});
return deferred.promise;
}
}]);
})(window.angular);
Later in your service when you are loading data you would use the HttpService instead of $http:
(function (angular) {
angular.module('app').service('dataService', ["HttpService", function (httpService) {
this.getResources = function (params) {
return httpService.post('/serverMethod', { param: params });
};
}]);
})(window.angular);
Later in your code you would like to load the data:
(function (angular) {
var app = angular.module('app');
app.controller('YourController', ["DataService", "PendingRequestsService", function (httpService, pendingRequestsService) {
dataService
.getResources(params)
.then(function (data) {
// do stuff
});
...
// later that day cancel requests
pendingRequestsService.cancelAll();
}]);
})(window.angular);
Cancelation of requests issued with $http is not supported with the current version of AngularJS. There is a pull request opened to add this capability but this PR wasn't reviewed yet so it is not clear if its going to make it into AngularJS core.
If you want to cancel pending requests on stateChangeStart with ui-router, you can use something like this:
// in service
var deferred = $q.defer();
var scope = this;
$http.get(URL, {timeout : deferred.promise, cancel : deferred}).success(function(data){
//do something
deferred.resolve(dataUsage);
}).error(function(){
deferred.reject();
});
return deferred.promise;
// in UIrouter config
$rootScope.$on('$stateChangeStart', function (event, toState, toParams, fromState, fromParams) {
//To cancel pending request when change state
angular.forEach($http.pendingRequests, function(request) {
if (request.cancel && request.timeout) {
request.cancel.resolve();
}
});
});
For some reason config.timeout doesn't work for me. I used this approach:
let cancelRequest = $q.defer();
let cancelPromise = cancelRequest.promise;
let httpPromise = $http.get(...);
$q.race({ cancelPromise, httpPromise })
.then(function (result) {
...
});
And cancelRequest.resolve() to cancel. Actually it doesn't not cancel a request but you don't get unnecessary response at least.
Hope this helps.
This enhances the accepted answer by decorating the $http service with an abort method as follows ...
'use strict';
angular.module('admin')
.config(["$provide", function ($provide) {
$provide.decorator('$http', ["$delegate", "$q", function ($delegate, $q) {
var getFn = $delegate.get;
var cancelerMap = {};
function getCancelerKey(method, url) {
var formattedMethod = method.toLowerCase();
var formattedUrl = encodeURI(url).toLowerCase().split("?")[0];
return formattedMethod + "~" + formattedUrl;
}
$delegate.get = function () {
var cancelerKey, canceler, method;
var args = [].slice.call(arguments);
var url = args[0];
var config = args[1] || {};
if (config.timeout == null) {
method = "GET";
cancelerKey = getCancelerKey(method, url);
canceler = $q.defer();
cancelerMap[cancelerKey] = canceler;
config.timeout = canceler.promise;
args[1] = config;
}
return getFn.apply(null, args);
};
$delegate.abort = function (request) {
console.log("aborting");
var cancelerKey, canceler;
cancelerKey = getCancelerKey(request.method, request.url);
canceler = cancelerMap[cancelerKey];
if (canceler != null) {
console.log("aborting", cancelerKey);
if (request.timeout != null && typeof request.timeout !== "number") {
canceler.resolve();
delete cancelerMap[cancelerKey];
}
}
};
return $delegate;
}]);
}]);
WHAT IS THIS CODE DOING?
To cancel a request a "promise" timeout must be set.
If no timeout is set on the HTTP request then the code adds a "promise" timeout.
(If a timeout is set already then nothing is changed).
However, to resolve the promise we need a handle on the "deferred".
We thus use a map so we can retrieve the "deferred" later.
When we call the abort method, the "deferred" is retrieved from the map and then we call the resolve method to cancel the http request.
Hope this helps someone.
LIMITATIONS
Currently this only works for $http.get but you can add code for $http.post and so on
HOW TO USE ...
You can then use it, for example, on state change, as follows ...
rootScope.$on('$stateChangeStart', function (event, toState, toParams) {
angular.forEach($http.pendingRequests, function (request) {
$http.abort(request);
});
});
here is a version that handles multiple requests, also checks for cancelled status in callback to suppress errors in error block. (in Typescript)
controller level:
requests = new Map<string, ng.IDeferred<{}>>();
in my http get:
getSomething(): void {
let url = '/api/someaction';
this.cancel(url); // cancel if this url is in progress
var req = this.$q.defer();
this.requests.set(url, req);
let config: ng.IRequestShortcutConfig = {
params: { id: someId}
, timeout: req.promise // <--- promise to trigger cancellation
};
this.$http.post(url, this.getPayload(), config).then(
promiseValue => this.updateEditor(promiseValue.data as IEditor),
reason => {
// if legitimate exception, show error in UI
if (!this.isCancelled(req)) {
this.showError(url, reason)
}
},
).finally(() => { });
}
helper methods
cancel(url: string) {
this.requests.forEach((req,key) => {
if (key == url)
req.resolve('cancelled');
});
this.requests.delete(url);
}
isCancelled(req: ng.IDeferred<{}>) {
var p = req.promise as any; // as any because typings are missing $$state
return p.$$state && p.$$state.value == 'cancelled';
}
now looking at the network tab, i see that it works beatuifully. i called the method 4 times and only the last one went through.
You can add a custom function to the $http service using a "decorator" that would add the abort() function to your promises.
Here's some working code:
app.config(function($provide) {
$provide.decorator('$http', function $logDecorator($delegate, $q) {
$delegate.with_abort = function(options) {
let abort_defer = $q.defer();
let new_options = angular.copy(options);
new_options.timeout = abort_defer.promise;
let do_throw_error = false;
let http_promise = $delegate(new_options).then(
response => response,
error => {
if(do_throw_error) return $q.reject(error);
return $q(() => null); // prevent promise chain propagation
});
let real_then = http_promise.then;
let then_function = function () {
return mod_promise(real_then.apply(this, arguments));
};
function mod_promise(promise) {
promise.then = then_function;
promise.abort = (do_throw_error_param = false) => {
do_throw_error = do_throw_error_param;
abort_defer.resolve();
};
return promise;
}
return mod_promise(http_promise);
}
return $delegate;
});
});
This code uses angularjs's decorator functionality to add a with_abort() function to the $http service.
with_abort() uses $http timeout option that allows you to abort an http request.
The returned promise is modified to include an abort() function. It also has code to make sure that the abort() works even if you chain promises.
Here is an example of how you would use it:
// your original code
$http({ method: 'GET', url: '/names' }).then(names => {
do_something(names));
});
// new code with ability to abort
var promise = $http.with_abort({ method: 'GET', url: '/names' }).then(
function(names) {
do_something(names));
});
promise.abort(); // if you want to abort
By default when you call abort() the request gets canceled and none of the promise handlers run.
If you want your error handlers to be called pass true to abort(true).
In your error handler you can check if the "error" was due to an "abort" by checking the xhrStatus property. Here's an example:
var promise = $http.with_abort({ method: 'GET', url: '/names' }).then(
function(names) {
do_something(names));
},
function(error) {
if (er.xhrStatus === "abort") return;
});