Angular Http不工作

Question

我正在尝试将数据发布到Angular的后端Node js文件中.表单提交后,函数调用:

cmdSubmit() : void 
{
       console.log(this.cli);
       this.Cliservice.postdata(this.cli)
                      .then(clidata  => this.clidata.push(clidata),
                            error =>  this.errorMessage = <any>error);

}

postdata功能代码:

postdata(obj: any): Promise<any> {
    alert('hello');
    let body = JSON.stringify({ obj });
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });

    return this.http.post(this.runUrl, body, options)
                    .map(this.extractData)
                    .catch(this.handleError);

    /*return this.http.post(this.runUrl, body, options)
                      .map(this.extractData)
                      .catch(res => {
             // do something

             // To throw another error, use Observable.throw
             return Observable.throw(res.json());
      });*/


    }

    private extractData(res: Response) {
       let body = res.json();
       return body.data || { };
    }

private handleError (error: any) {
    // In a real world app, we might use a remote logging infrastructure
    // We'd also dig deeper into the error to get a better message
    let errMsg = (error.message) ? error.message :
                  error.status ? `${error.status} - ${error.statusText}` : 'Server error';
    console.error(errMsg); // log to console instead
    return Observable.throw(errMsg);
 }

}

但这里什么也没发生.我没有收到任何错误消息.你能就此提出一些建议吗？

Answer 1

Http返回的每个函数都Observable必须.subscribe()附加一个方法.当您错过此方法时,请求将不会执行.所以将.subscribe()方法附加到每个函数.

正如在评论中有人说,你正在使用两种方法:Promise style和Observable style,所以我建议你使用一个普通的款式.

this.http.post(this.runUrl, body, options)
         .map(this.extractData).subscribe(/*here your parameters*/);