angular2-http

问题 Do you need to unsubscribe from Angular 2 http calls to prevent memory leak? fetchFilm(index) { var sub = this._http.get(`http://example.com`) .map(result => result.json()) .map(json => { dispatch(this.receiveFilm(json)); }) .subscribe(e=>sub.unsubscribe()); ... 回答1: So the answer is no, you don't. Ng2 will clean it up itself. The Http service source, from Angular's Http XHR backend source: Notice how it runs the complete() after getting the result. This means it actually unsubscribes on

问题 I'm working on an Angular 2 service returning data from a restful WebApi backend. I'm trying to make it gracefully handle the service not being available however I'm getting unexpected information in the error responses. Here's the code update(fund, transactionId:string, showToastOnError: boolean, useCorrectUrl: boolean) { let options = this.getStartCall(); options.headers.append("transaction-id", transactionId) let url = fundsUrl + (useCorrectUrl ? "" : "breakTheUrl"); return this._http.put

问题 I have a method for handle our errors from http requests and it looks like this public handleError(err: any, caught: Observable<any>): Observable<any> { //irrelevant code removed this.logger.debug(err);//example of problem return caught; } It is invoked like this (example method, but shows the error) public makeHttpCall() { this.http.get("http://api.exmaple.com/getsomedata") .map(r=> r.json()) .catch(this.handleError); } The problem with the above code is that when calling this.logger.debug

问题 I am new to Angular2. I have one PHP file and would like to fetch content from PHP file in Angular component. Following is my code I have written by taking references. I am not able to figure out what is the issue as I am not getting any error in console nor desired output. PHP code - 'getArea.php' <?php $link = mysql_connect('localhost', 'root', ''); mysql_select_db("mydb", $link); $data=array(); $result = mysql_query("SELECT * FROM dam_color", $link); $num_rows = mysql_num_rows($result);

问题 I need to chain many http requests, the number of request is variable and they are not dependant from the result of the previous one, I just need to keep the returned object of the last request. I've been given two solutions on this thread, the first solution using Observable.concat() works, but a contributor suggested me a more elegant way to perform that, by using concatMap() . Here's my current code : MyComponent submitForms() { var formToSubmit = [...]; // Contains dirty forms that be

问题 All my Backend API requests return new token information in headers, even when them throw exceptions. In the next request I need to send these new token information. So I'm trying to figure out an unique and standard way to do that: let requestOptions = new RequestOptions(Object.assign({ method: method, url: environment.apiHost + url, body: body, headers: authenticatedRequest ? this.requestService.getAuthHeaders() : this.requestService.getJsonHeaders(), withCredentials: authenticatedRequest }

问题 Actually I am trying to connect an Angular app with my Maven-Jersey-webapp(implements Rest Services concept) and getting this error. More Details: I am using Oracle10g XE Database Eclipse IDE for maven Project(http://localhost:8080/MavenProject) Angular CLI(http://localhost:4200/) I want to retrieve data from database(Stored in students table) and then display that data in Angular App in a Table my jersey project returns the table data in JSON and XML format(Running Successfully) retrieving

问题 My angular 4.3.2 code is calling my back-end service that takes 2-4 minutes to return. Using just the default this.http.get code, I see that the default timeout kicks in after 2 minutes. However when I try to put in a timeout of anything OVER 2 minutes, it fails in that it will never let the timeout be over 2 minutes. I've tried with 100, 100000 (1.7m) and 114000(1.9m) and those work in that it gets timed out right at those values. But when I try 126000 (2.1m), 180000 (3m) and 1800000 (30m),

问题 I'm using Angular2 RC5 with an ASP.NET Core server that makes the API calls to get my data. I'm actually wondering if there is a way to reduce the number of http calls you make with Angular2, because I fear there will be a lot if I keep using components the way I do. Here is a concrete example. I want to get a text value from the database, which is defined by an ID and a Language. I then made the following component : dico.component.ts @Component({ selector: 'dico', template: `{{text}}`,

问题 I am new to Angular2 and using http service to get data from asp.net mvc webapi. API returns data which is in format shown below RequestResponse{ public string Message {get;set;} public int Status {get;set;} } Http get request gets data and is fed to map function from Rxjs map(result => result.json()) which will convert result into format as shown below { message : 'success!', status : 1 } As you can see, output property names have lost case sensitivity. Have read from other SO questions that