.then在角度2的void类型中不存在 [英] .then does not exist in type void in angular 2

问题描述

我知道以下查询有一个解决方案，但我是angular2的新手，不要在void函数中添加什么内容，请帮忙！在此处输入图片描述

I know that there is a solution available to the following query but I am a noob in angular2 and do not what should be added in the void function please Help! enter image description here

export class PasswordResetPage {

  email : string;

  constructor(public navCtrl: NavController, 
              public navParams: NavParams , 
              public userservice :UserProvider,
              public AlertCtrl :AlertController) { }

  reset(){
    let alert = this.AlertCtrl.create({
      buttons :['ok']
    });
    this.userservice.passwordreset(this.email).then((res: any)=>{
      if(res.success){
        alert.setTitle('Email sent');
        alert.setSubTitle('please follow the instructions in the email
                           to reset the password')
      }
      else{
        alert.setTitle('failed');
      }
    })
  }
}

推荐答案

重要的是要知道此服务调用的返回类型是什么:

It's important to know what the return type of this service call is:

this.userservice.passwordreset(this.email)

.然后仅在服务调用返回Promise时才适用，并且更有可能返回Observable，因此您需要订阅该值以获取值.

.then is only applicable if the service call returns a Promise, and it's more likely that it's returning an Observable, so you'd need to subscribe to that to get the value.

this.userservice.passwordreset(this.email)
.subscribe(
      res => {
         alert.setTitle('Email sent');
         alert.setSubTitle('please follow the instructions in the email to reset the password')
      },
      err => {
          console.log('Error', err),
          alert.setTitle('failed')
      }
);

这篇关于.then在角度2的void类型中不存在的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！