I have the following controller:
public class UserController : BaseApiController
{
// GET api/<controller>
public string Get()
{
var currentuser = CurrentUser.Name;
return currentuser;
}
}
The value of currentuser I pass it the datacontext in this way:
function getName() {
var deferred = $q.defer();
var promise = deferred.promise;
cachedPromises.currentuser = promise;
$http.get(baseUrl + 'api/user').success(getSucceeded).error(getFailed);
return cachedPromises.currentuser;
function getSucceeded(data) {
console.log('data:', data);
}
function getFailed(parameters) {
console.log("failed", parameters);
}
}
On the console log console.log('data:', data); I get the value and in order to apply binding I have to pass this value to the scope in the controller.js. In order to do that, I have done a controller in this way.
LogName.$inject = ['$scope', 'datacontext']
function LogName($scope, datacontext) {
$scope.name =[];
datacontext.getName().then(function (currentuser) {
$scope.name = currentuser;
});
}
And on the view I have the following code for data binding :
<h1 ng-controller="LogName" class="title">{{name}}</h1>
The binding is shown as an empty array, and I don't understand what goes wrong .
EDIT:
When I do a console log on the controller:
datacontext.getName().then(function (currentuser) {
$scope.name = currentuser;
console.log('current', currentuser);
});
Nothing appears on the view, the compiler does not reach the datacontext.getName
You MVC controller returning string public string Get() and you declare $scope.name =[]; as array change it to $scope.name =''; that should helps
and change your function getName to :
function getName() {
var deferred = $q.defer();
$http.get(baseUrl + 'api/user').success(getSucceeded).error(getFailed);
return deffered.promise;
function getSucceeded(data) {
console.log('data:', data);
//add this
deferred.resolve(data);
}
function getFailed(parameters) {
console.log("failed", parameters);
deferred.reject(parameters);;
}
return deffered.promise;
}
You are never resolving your promise to provide the name. Add a resolve to the getSucceeded function and a reject to the error function.
function getSucceeded(data) {
console.log('data:', data);
promise.resolve(data);
}
function getFailed(parameters) {
console.log("failed", parameters);
promise.reject(parameters);
}
This will provide the data to the functions that are waiting on the promise results.
There are two issues:
Firstly, you are not resolving the promise. You need to resolve your promise with your data that is returned from the server.
Second, the result is actually in the results property of the data that is returned from the server. Here as you are retrieving only name, you should use below code:
function getSucceeded(data) {
console.log('data:', data);
deferred.resolve(data.results[0]);
}
Related
I am trying to delete a post from a list. The delete function is performing by passing serially to a delete function showed below.
$scope.go = function(ref) {
$http.get("api/phone_recev.php?id="+ref)
.success(function (data) { });
}
After performing the function, I need to reload the http.get request which used for listing the list.
$http.get("api/phone_accept.php")
.then(function (response) { });
Once the function performed. The entire list will reload with new updated list. Is there any way to do this thing.
Try this
$scope.go = function(ref) {
$http.get("api/phone_recev.php?id="+ref)
.success(function (data) {
//on success of first function it will call
$http.get("api/phone_accept.php")
.then(function (response) {
});
});
}
function list_data() {
$http.get("api/phone_accept.php")
.then(function (response) {
console.log('listing');
});
}
$scope.go = function(ref) {
$http.get("api/phone_recev.php?id="+ref)
.success(function (data) {
// call function to do listing
list_data();
});
}
Like what #sudheesh Singanamalla says by calling the same http.get request again inside function resolved my problem.
$scope.go = function(ref) {
$http.get("api/phone_recev.php?id="+ref).success(function (data) {
//same function goes here will solve the problem.
});}
});
You can use $q - A service that helps you run functions asynchronously, and use their return values (or exceptions) when they are done processing.
https://docs.angularjs.org/api/ng/service/$q
Inside some service.
app.factory('SomeService', function ($http, $q) {
return {
getData : function() {
// the $http API is based on the deferred/promise APIs exposed by the $q service
// so it returns a promise for us by default
return $http.get("api/phone_recev.php?id="+ref)
.then(function(response) {
if (typeof response.data === 'object') {
return response.data;
} else {
// invalid response
return $q.reject(response.data);
}
}, function(response) {
// something went wrong
return $q.reject(response.data);
});
}
};
});
function somewhere in controller
var makePromiseWithData = function() {
// This service's function returns a promise, but we'll deal with that shortly
SomeService.getData()
// then() called when gets back
.then(function(data) {
// promise fulfilled
// something
}, function(error) {
// promise rejected, could log the error with: console.log('error', error);
//some code
});
};
I am calling my data from my api through a factory that looks like this:
app.factory('Service', ['$http', function ($http) {
var urlBase = 'http://localhost:50476/api';
var Service = {};
Service.getComp = function () {
return $http.get(urlBase + '/complaints')
};
return Service;
}]);
Then I use my controller to use the directive:
getComp();
$scope.comp = [];
function getComp() {
var deferred = $q.defer();
Service.getComp()
.success(function (comp) {
console.log('comp', comp); //returns array data
$scope.comp = comp.data;
deferred.resolve(comp);
})
.error(function (error) {
$scope.error = 'error' + error.message;
});
return deferred.promise;
}
$scope.index = 0;
$scope.complaints = $scope.comp[0];
console.log($scope.complaints); //undefined
console.log($scope.comp); //array of 0
When I try to access the items outside of the function it is undefined. I tried to look for resolutions like using $q but it is still not displaying data. When I added the deferred part my ng-repeat stops working as well.
Try this:
getComp();
$scope.comp = [];
function getComp() {
return Service.getComp()
.success(function (comp) {
$scope.comp = comp.data;
$scope.complaints = $scope.comp[0];
})
.error(function (error) {
$scope.error = 'error' + error.message;
});
}
The values are undefined when you do your logs because those lines run before your request comes back from the server. That's why setting $scope.complaints has to go into the success callback.
if you want to make sure complaints are loaded on certain states before you start your logic you can use ui-routers resolve keyword (i suppose you are using ui-router with ionic - standard package)
In you main.js
$stateProvider.state('yourState', {
resolve: {
complaints: function(Service) {
return Service.getComp();
}
}
});
in your controller you can then inject complaints
.controller('myController', function(complaints) {
$scope.complaints = complaints;
})
resolve at $stateProvider will block and wait for the promise to resolve...
I have the following function in an Angular service:
this.getTasks = function() {
return $http.post(endpoint, params)
.then(function (response) {
console.log(response.data);
return response.data;
});
};
I then try to bind the return value to a variable in my controller by first executing the service function, and using .then() to assign it to a variable:
vm.getTasks = function() {
LocationGraphService.getTasks()
.then(function (response.data) {
vm.tasks = response.data;
});
}
This doesn't work. I know the service function works as the console.log shows me the data I'm pulling. I need help with calling the function in the controller and assigning it to a variable. Would $q be appropriate here?
Since your service normalizes response object to be data property of the original response, you don't need to do it one more time in controller. Correct controller logic would be:
vm.getTasks = function() {
LocationGraphService.getTasks()
.then(function (data) {
vm.tasks = data;
});
};
i have a factory am passing it to controller LoginCtrl
.factory('Fbdata', function(){
var service = {
data: {
apiData: []
},
login: function () {
facebookConnectPlugin.login(["email"],
function() {
facebookConnectPlugin.api("me/?fields=id,email,name,picture", ["public_info","user_birthday"],
function (results) {
service.data.apiData = results;
console.log(service.data.apiData);
return results;
},
function (error) {
console.error('FB:API', error);
});
},
function(err) {
console.error('FB:Login', err);
});
}
};
return service;
})
LoginCtrl:
.controller('LoginCtrl', function($scope, Fbdata){
$scope.login = function(){
if (!window.cordova) {
var appId = "appId";
facebookConnectPlugin.browserInit(appId);
}
$scope.loginData = Fbdata.login();
console.log(Fbdata.data.apiData);
// got empty array []
$scope.retVal= angular.copy(Fbdata.data.apiData);
};
})
the Fbdata.data.apiData return empty array and i only could see the returned data from the login success function in the console .
my template which is has LoginCtrl as controller:
<div class="event listening button" ng-click="login();">Login with Facebook</div>
<h2>{{loginData.name}}</h2>
<h2>{{retVal.name}}</h2>
There is a variety of ways to achieve this, example:
Now I have never used Cordova Facebook Plugin so I'm not sure if you need to run the api function after the log in, or how those procedures need to be ordered. But I wanted to show you an example of how to retrieve the data from the factory using your code sample. Hope that helps
Edit 2:
I have changed my code to using promises that way we make sure that we don't call one without the other being completed, I am not a fan of chaining the login and api functions within one function since it is possible(?) that you may need to call login() but don't want to call api(), please try my code and paste in your console logs in the bottom of your question.
Factory:
// Let's add promises to our factory using AngularJS $q
.factory('Fbdata', ['$q', function($q){
// You could also just replace `var service =` with `return` but I thought this
// would make it easier to understand whats going on here.
var service = {
// I generally nest result to keep it clean when I log
// So results from functions that retrieve results are stored here
data: {
login: [],
api: []
},
api: function() {
var q = $q.defer();
facebookConnectPlugin.api("me/?fields=id,email,name,picture", ["public_info","user_birthday"],
function (results) {
// assign to the object being returned
service.data.api = results;
// The data has returned successfully so we will resolve our promise
q.resolve(results);
},
function (error) {
// We reject here so we can inform the user within through the error/reject callback
q.reject(error);
console.error('FB:API', error);
});
// Now that we have either resolved or rejected based on what we received
// we will return the promise
return q.promise;
},
login: function () {
var q = $q.defer();
facebookConnectPlugin.login(["email"], function (results) {
// assign to the object being returned
service.data.login = results;
q.resolve(results);
}, function(err) {
q.reject(error);
console.error('FB:Login', err);
});
return q.promise;
}
};
return service;
}])
Controller:
.controller('LoginCtrl', function($scope, Fbdata){
$scope.login = function(){
if (!window.cordova) {
var appId = "appid";
facebookConnectPlugin.browserInit(appId);
}
// By using the promises in our factory be can ensure that API is called after
// login by doing the following
// then(success, reject) function allows us to say once we have a return, do this.
Fbdata.login().then(function () {
$scope.loginData = Fbdata.data.login;
// Check what was returned
console.log('loginData', $scope.loginData);
Fbdata.api().then(function () {
$scope.apiData = Fbdata.data.api;
console.log('apiData', $scope.apiData);
}, function () {
// Tell the user that the api failed, if necessary
});
}, function () {
// Tell the user that the log in failed
});
};
});
regarding the question Passing data between controllers in Angular JS? I ran into the situation that my ProductService is executing some $http(RestFUL Service) and returns NULL because the callback function isn't completed.
Because the p.getProducts() function is evaluted and the callback function which fetches the data from the RestFUL service, is'nt complete the function returns always null.
app.service('productService', function() {
p = this
p.productList = [];
var addProduct = function(newObj) {
productList.push(newObj);
}
p.getProducts = function(){
return $http(RestFUL Service,function(data){p.productList.push(data)});
}
return {
addProduct: addProduct,
getProducts: return p.getProducts();
};
});
How can I solve this problem?
If you change your service to look more like this
return {
addProduct: addProduct,
getProducts: p.getProducts
}
then in controller you can make it work like that
app.controller('myCtrl', function ($scope, productService) {
var products = null
productService.getProducts().then(function(response){
//do something with data returned
})
})
your getProducts return $http which itself returns promise, that's why the I used then in controller
You must play with callback's. The http is an async operation, and for that reason you can´t return a valid result right away. How invoke getProducts must set as parameter a function (callback) that will be invoked when http is completed - when data is available.
app.service('productService', function() {
p = this
p.productList = [];
var addProduct = function(newObj) {
productList.push(newObj);
}
p.getProducts = function(callback){
$http(RestFUL Service,function(data){
p.productList.push(data)
callback(data);//do something with data
});
}
return {
addProduct: addProduct,
getProducts: p.getProducts
};
}
//invoking
getProducts(function(products){
//do something with products
});