Angular 2 Observable订阅不起作用-Java 学习之路

我试图订阅一个像init这样的组件的observable：

this.ticketService.getTicketsAsync(filters).subscribe(
        tickets => this.ticketResponse = tickets,
        () => console.log('hi'))

有没有理由说第一个lambda表达式可以工作，但第二个表达式从不这样做？

编辑：

以下是getTicketAsync返回的代码帽：

getTicketsAsync(ticketFilters : TicketSearch): Observable<TicketResponse> {

    let api_endpoint = AppSettings.API_ENDPOINT + 'WebReport/request_report'
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({headers : headers, withCredentials : true});
    return this.http.post(api_endpoint, ticketFilters, options).map(this.extractData).catch(this.handleError);





}

2 回答

当观察到抛出错误时，第二个是 catch .

subscription = source.subscribe(
  x => console.log('onNext: %s', x),
  e => console.log('onError: %s', e),
  () => console.log('onCompleted'));

https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/subscribe.md

Solution: 1.使用 onNext hook：

this.ticketService.getTicketsAsync(filters).subscribe(
    tickets => {
      this.ticketResponse = tickets;
      console.log('hi');
    },
    () => console.log('ERROR!'));

2.使用 onCompleted 钩子：

this.ticketService.getTicketsAsync(filters).subscribe(
  tickets => this.ticketResponse = tickets,
  error => console.log('ERROR: ' +error),
  () => console.log('hi')
);

回复于 2024-04-26T17:59:14+08:00

大箭头代表使你的代码像这样的函数

this.ticketService.getTicketsAsync(filters)
.subscribe(
  function(tickets){
    this.ticketResponse = tickets,
    function(){
      console.log("hi")
    }
  }
)

你传递两个参数（这是两个回调函数） .

回复于 2024-04-26T17:59:14+08:00

Angular 2 Observable订阅不起作用

2 回答

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