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所以我想为我的Angular 2应用实现一个自定义的XHRBackend。这是我的课:在rxjs Observer上订阅多次而不执行多个请求
import {Request, XHRBackend, BrowserXhr, ResponseOptions, XSRFStrategy} from "@angular/http";
import "rxjs/add/operator/catch";
import "rxjs/add/observable/throw";
import {SlimLoadingBarService} from "ng2-slim-loading-bar";
export class LoadingBarXHRBackend extends XHRBackend {
constructor(_browserXhr: BrowserXhr, _baseResponseOptions: ResponseOptions, _xsrfStrategy: XSRFStrategy, private slimLoadingBarService: SlimLoadingBarService) {
super(_browserXhr, _baseResponseOptions, _xsrfStrategy);
}
createConnection(request: Request) {
this.slimLoadingBarService.start();
let xhrConnection = super.createConnection(request);
xhrConnection.response.share().subscribe(() => {
this.slimLoadingBarService.complete();
});
return xhrConnection;
}
}
正如你可以看到我尝试使用.share()方法中所描述的here,但它不工作,我希望它的方式。
我想“挂钩”到XHR请求的创建和完成以显示加载栏。但是如果我离开那个.share(),我会为每个.subscribe()调用获得一个单独的HTTP请求。 ?
但是,如果使用.share()我的第二次认购事项将不会在所有:(
什么我做错了感谢执行
也许http://stackoverflow.com/questions/36271899/what-is-the-correct-way-to-share-the-result-of-an-angular-2-http-network-call-in –