My apps are using many web services on the intranet, and url-s for those depend on the server environment.
My apps are hosted on IIS, which adds an HTTP response header like this: Environment: DEV, so every web app knows in which server environment it is running, and thus which intranet servers it must use to call all the services.
Each of my angular apps uses a service that issues a simple GET against the app's own root just to get any response with the environment name in it, and set configuration accordingly.
Question:
How should an angular app implement such a service that would execute as the very first thing in the application, and make sure that while it is getting that first response, nothing in the app tries to execute an HTTP request against other services, or even try to use any configuration provided by my environment service?
Is there a way to implement such a service in angular that could block every other service / factory in the application till it is done initializing itself?
I have many other services in the app, and none of them really know what to do till my environment service has finished its initialization.
UPDATE
Looking at it from another angle.... is it possible to implement such an interceptor in angular that could do the following?:
execute an HTTP request and block the app's execution till it gets a response
make information from the response available throughout the app as a service/factory/config.
Angular lifecycle could be one solution. Using the angular.config() phase you could peek at the headers of the HTTP service.
Create a factory called 'httpInterceptor'
function httpInterceptors(siteConfig, $q, $injector) {
return {
response: function(data, status, headers) {
siteConfig.setEnvironment(headers['Environment']);
return data;
}
};
)
Then in angular.config()
$httpProvider.interceptors.push('httpInterceptor');
If you truly want to block the other option is to use UI router resolve property to block routes loading until the request has been made https://github.com/angular-ui/ui-router/wiki you can add the resolve method to the root state.
Resolve
You can use resolve to provide your controller with content or data that > is custom to the state. resolve is an optional map of dependencies which > should be injected into the controller.
If any of these dependencies are promises, they will be resolved and converted to a value before the controller is instantiated and the $stateChangeSuccess event is fired.
Related
Is it possible to communicate restfull webservice using angularjs.my application located in c://Higi folder and i have created restfull webservice in eclipse now i am using return
$http.get('http://localhost:8080/RestfulAndAngularJS_Server/rest/product/findall')
.success(function(response){
$window.alert('success')
});
code for connecting with restfull webservice it is possible or not
If your http://localhost:8080/RestfulAndAngularJS_Server/rest/product/findall endpoint is accessible in general, then it should be accessible via the angular $http service.
You can test whether the server is up by pasting that url in the browser. Depending on how your server side code is set up with regard to content negotiation, you might get an error back (which error will depend on what you used to build the web service, but at least you'll know that it's up).
If it's up then you should be able to call it from the angular $http service. If not, then make sure its' running by starting whatever server you are using in eclipse.
If you're sure the server is up and running, your call should work. You might also consider handling the error callback in your $http.get call to see whats' happening there.
What is going on in the configure phase of bootstrapping angular app. Unable to imagine it. Right now i am confused with providers. SO may be insight to configure phase help me understand whole process.As provider can be injected in config phase.
Thanks.
An angular application uses services ($http, $location, etc.).
It's sometimes necessary to configure these services before using them. For example, the $location service has two modes of execution: the "normal" mode, and the "html5" mode. $http might need some headers configured before even sending its very first HTTP request.
To configure these services, Angular uses providers. Providers are objects whose role is to accept configuration options during the configuration phase, and then, once everything is set up, to create the unique instance of a service.
So, to configure the $location service, you use its $locationProvider during the configuration phase. Once that phase is done, Angular, during the run phase, will call the provider's $get() method, which will create and return the $location service (hence the name "provider").
I am writing an AngularJs app to test an API we developed. The app uses the $http object to make requests to the API. One of the asks is that after the call it's possible to review the raw HTTP (headers and bodies) Request/Response, similarly to what's available in Fiddler via Raw tabs.
Is it something that $http provides out of the box?
If not, it appears that the only challenge is gaining access to the actual request http headers. It's easy to get the response headers and request/response bodies, but not sure how to get the actual request headers.
Thanks.
If you are using $http service to make your API calls, you can use Interceptors to achieve what you want.
Here is what docs tell us about them:
For purposes of global error handling, authentication, or any kind of synchronous or asynchronous pre-processing of request or postprocessing of responses, it is desirable to be able to intercept requests before they are handed to the server and responses before they are handed over to the application code that initiated these requests. The interceptors leverage the promise APIs to fulfill this need for both synchronous and asynchronous pre-processing.
You can find more in depth explanation in the official docs. For example, here.
Also, there are some questions about interceptors on this site. There are some examples of their usage for displaying loading screen in applications: here, here and, probably, somewhere else.
Hope, this helps.
Yes, AngularJs is wrapped around some JQuery or internally JQlite if JQuery is not present and written in Javascript and it provides some pre-defined services. A typical service looks like the following.
AngularJS docs: tutorial step 5
$ Prefix Naming Convention You can create your own services, and in
fact we will do exactly that in step 11. As a naming convention,
Angular's built-in services, Scope methods and a few other Angular
APIs have a $ prefix in front of the name.
The $ prefix is there to namespace Angular-provided services. To
prevent collisions it's best to avoid naming your services and models
anything that begins with a $.
If you inspect a Scope, you may also notice some properties that begin
with $$. These properties are considered private, and should not be
accessed or modified.
angular.module('myApp')
.factory('myService', function ($http, $injector) {
'use strict';
return $http.get('/endpoint')
.then(function () {
return $injector.get('endpoint');
}
.error(function () {
// handle error
}
};
})
Have a look a the image in AngularJS docs which shows a number of services with the $ prefix. Mostly, wrappers over service. It is reserved. More at FAQ.
I am unable to access the session values which is set by node.js in Angular.js controller. I am using the Express framework. How to resolve it? Here is my code.
app.use(express.cookieParser());
app.use(express.session({
secret: '1234567890QWERTY',
cookie: { httpOnly: false }
}));
//setting the values
cookies.set('username',username);
req.session.username=username;
Presumably you want to do something like show the username in your angular app. As I mentioned in this answer, the hard part to Angular is not thinking about what data the server has, but thinking about data the server should provide to the browser via API.
My general model is to have the angular page start up without any data and have a low-level controller invoke a service (say AuthenticationService or IdentityService) that requests relevant data from the server, e.g. HTTP GET /api/identity. That will return a block of JSON that the page can then store in that low-level controller. Any deeper controller can then access the identity (or whatever) data loaded in that first request.
I'm using AngularJS with UI-Router and am attempting to attach a query parameter to a url on all http requests across my site.
I have an OAuth system on the backend and was previously applying Authorization headers to all requests, however to preserve backwards compatibility - have discovered I will have to instead apply a url parameter with the user identification to the backend.
My issue is that, I cannot use $httpInterceptor in the config portion of the app, because at that point in the app I don't have the current User, and can't inject $http to resolve the current user because that creates a circular dependency.
I was trying to use $http.defaults.transformRequest in the run portion of the app, but that didn't seem to be able to append a parameter to the url.
Is there a way to do this short of hand writing it on every REST request across the app?
I had similar problem in my current project.
To solve the problem I manually request current user info before app bootstapping & store it in localStorage.
Then bootstrap the app & in the config section you will have accesss to current user info.
TIP: to get user info before app bootstrap you can still use $http service by manually injecting it:
angular.injector(['ng']).get('$http');