Question

在父组件中

我得到了未定义的数据值。这是我的代码。

parentComponent.ts

testMethod(){
  console.log('t', this.answer.postRequest(this.quetion).subscribe(data => { 
    console.log('d',data);
  })); //here i got undefined value to data
}

serviceProvider.ts

postRequest(ques:string):Observable<any>{
  let header = new HttpHeaders({
    'Content-Type' : 'application/json',"Accept":'application/json'
  });
  console.log(ques)

  return this.http.post(
    "http://localhost:8080/hello",
    {'q': ques},
    {headers: header}
  ).map(data => {
    console.log(data);
  }, // this work fine and value is assigned to data as expected
  error => {(error);// Error getting the data});
}

Answer 1

像这样使用

返回this.http.post（＆＃34; http://localhost:8080/hello＆＃34;，{＆＃39; q＆＃39;：ques}，{header：header}） .map（data =＆gt; {console.log（data）;}） .map（（resp：Response）=＆gt; {return resp;}）;

它会有所帮助

如何从angular4（ionic3）的服务提供程序组件传递对父组件的响应，我得到了未定义的值？

1 个答案: