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Angular on Rails API: HTTP Request


Angular on Rails API: HTTP Request

By : Kramyer Delmindodeoc
Date : November 20 2020, 11:01 PM
seems to work fine You should specify the whole URL if its on another domain, but also you need to have CORS enabled on the server (more on CORS here https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS). Angular is probably on another server (I assume you start it with ng serve), and that server is hosting the static files + URL rewrite (if you are using the HTML5 angular strategy) and the REST server that you are consuming is on a different port.
It should be this.http.get('http://localhost:3000/api/books.json')
code :


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Angular $http request not returning Rails resource

Angular $http request not returning Rails resource


By : Peter Lustig
Date : March 29 2020, 07:55 AM
it fixes the issue The data you are looking for will be passed as a parameter to the success callback from $http. $scope.posts in your example is the entire http object. Try something like this:
code :
angular.module('AngularRails').controller('PostsController', function($scope, $http) {
    $http.get('/posts.json').success(function(postData, status, headers, config){
        $scope.posts = postData; // this is the JSON from the web request
    });

    // $scope.posts = posts; <-- this was the $http promise object
});
def list
  posts = { posts: %w(post1 post2 post3 post4) } # Or ActiveRecord query etc...

  respond_to do |format|
    format.json { render json: posts }
  end
end
$http.get('http://localhost:3000/posts/list.json').success (data) ->
    $scope.posts = data.posts
    console.log $scope.posts // ["post1", "post2", "post3", "post4"]
How to return the result received from http request inside http request in ionic 2 framework using angular 2.My code is

How to return the result received from http request inside http request in ionic 2 framework using angular 2.My code is


By : alexandru996
Date : March 29 2020, 07:55 AM
I wish did fix the issue. What you could do is to make use of flatMap (mergeMap) here, since the second call is dependent on the result of the first call, so something like this:
code :
import 'rxjs/add/operator/mergeMap';

//....

getUsableToken() {
  return this.http.get('url')
    .map(data => {
      let secretKey = data.json().payload.platformInfo.key
      return secretKey;
    })
    // where 'key' is the parameter you need for the second call
    .flatMap(key => this.http.get('url').map(data => {
        let token = data.json().payload.token;
        return token;
    }))

}
doSomething() {
  this.myService.getUsableToken() 
    .subscribe(token => console.log(token))
}
Angular HttpClient makes multiple http request when only 1 http request is expected

Angular HttpClient makes multiple http request when only 1 http request is expected


By : Arveedar
Date : March 29 2020, 07:55 AM
wish of those help Every async pipe creates its own subscription to the observable, which ends in seperate API calls. You've got two options to solve it.
Option 1: Work with the as operator to save the result like this:
code :
<ng-container *ngIf="user | async as u">
 {{ u.firstname }}
 ...
</ng-container>
return this.httpClient.get<User>(this.apiUrl + "/" + id)   .pipe(
  tap(console.log), // this is executed multiple times!!!
    share(),
    catchError( (error) => {
      handleIt();
    })
);
How can I convert an ionic http GET request from @angular\Http to @ion-native\Http?

How can I convert an ionic http GET request from @angular\Http to @ion-native\Http?


By : user2184175
Date : November 18 2020, 04:01 AM
it should still fix some issue As per documentation, get returns a promise... but for "subscribe" (in order to use this.weatherProvider.getWeather(latitude, longitude).subscribe())... you need to return an observable from Promise
This should be able to get you what you're looking for...
wait http request to finish, then use the result in another http request in angular 6

wait http request to finish, then use the result in another http request in angular 6


By : user2981486
Date : March 29 2020, 07:55 AM
it helps some times hard to show you without your own code but it would look something like this:
code :
this.request1().pipe(
  switchMap(result1 => this.request2(result1.neededProp))
).subscribe(result2 => console.log(result2))
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