Angular 离子角未捕获(承诺)误差
我是爱奥尼亚的新手 关于琳达的课程是我对爱奥尼亚的介绍,我一直在成功地遵循导师的指导,直到他介绍了提供商。我的提供商文件如下所示:Angular 离子角未捕获(承诺)误差,angular,ionic2,Angular,Ionic2,我是爱奥尼亚的新手 关于琳达的课程是我对爱奥尼亚的介绍,我一直在成功地遵循导师的指导,直到他介绍了提供商。我的提供商文件如下所示: import { HttpClient } from '@angular/common/http'; import { Injectable } from '@angular/core'; /* Generated class for the PeopleDataProvider provider. See https://angular.io/guid
import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
/*
Generated class for the PeopleDataProvider provider.
See https://angular.io/guide/dependency-injection for more info on providers
and Angular DI.
*/
@Injectable()
export class PeopleDataProvider {
constructor(public http: HttpClient) {
console.log('Hello PeopleDataProvider Provider');
}
getPeople(){
return this.http.get('https://randomuser.me/api/?results=10&nat=us&seed=d07ade5f51ff3011')
.map(res => res.json())
.map(res => res.results);
}
}
import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { DetailPage } from '../detail/detail';
import { PeopleDataProvider } from '../../providers/people-data/people-data';
@Component({
selector: 'page-home',
templateUrl: 'home.html',
providers: [PeopleDataProvider]
})
export class HomePage {
public people = new Array();
private detailPage;
constructor(public navCtrl: NavController, public peopleData:PeopleDataProvider) {
peopleData.getPeople().subscribe(people => {
console.log('people',people);
this.people = people;
});
this.detailPage = DetailPage;
}
loadDetail(person){
console.log(person);
this.navCtrl.push(this.detailPage, {person:person});
}
}
我的home.ts文件如下:
import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
/*
Generated class for the PeopleDataProvider provider.
See https://angular.io/guide/dependency-injection for more info on providers
and Angular DI.
*/
@Injectable()
export class PeopleDataProvider {
constructor(public http: HttpClient) {
console.log('Hello PeopleDataProvider Provider');
}
getPeople(){
return this.http.get('https://randomuser.me/api/?results=10&nat=us&seed=d07ade5f51ff3011')
.map(res => res.json())
.map(res => res.results);
}
}
import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { DetailPage } from '../detail/detail';
import { PeopleDataProvider } from '../../providers/people-data/people-data';
@Component({
selector: 'page-home',
templateUrl: 'home.html',
providers: [PeopleDataProvider]
})
export class HomePage {
public people = new Array();
private detailPage;
constructor(public navCtrl: NavController, public peopleData:PeopleDataProvider) {
peopleData.getPeople().subscribe(people => {
console.log('people',people);
this.people = people;
});
this.detailPage = DetailPage;
}
loadDetail(person){
console.log(person);
this.navCtrl.push(this.detailPage, {person:person});
}
}
当应用程序加载时,我收到以下错误:
打字错误
类型“Object”上不存在属性“json”
src/providers/people-data/people-data.ts
返回
this.http.get(“”)
.map(res=>res.json()).map(res=>res.results)
帖子建议引入import'rxjs/add/operator/map'代码>作为解决方案
然而,这种导入并不能解决我的问题
额外并发症:
在对浏览器进行几次刷新后,错误变为以下异常,但我无法预测何时发生,也无法控制何时发生:
离子错误:未捕获(承诺中):错误:
StaticInjectorError(AppModule)[PeopleDataProvider->HttpClient]:
我不知道这两个错误是否相关。您不必在响应中使用map
和调用.json
,只有在使用旧的而不是旧的时才需要这些
所以你的方法应该是这样的
PeopleDataProvider
import 'rxjs/add/operator/map';
..
getPeople(){
return this.http.get<any>('https://randomuser.me/api/?results=10&nat=us&seed=d07ade5f51ff3011')
.map(res => res.results);
}
您不必在响应中使用map
和调用.json
,只有当您使用旧的而不是旧的时才需要这些
所以你的方法应该是这样的
PeopleDataProvider
import 'rxjs/add/operator/map';
..
getPeople(){
return this.http.get<any>('https://randomuser.me/api/?results=10&nat=us&seed=d07ade5f51ff3011')
.map(res => res.results);
}
因为您使用的是HttpClient,所以它的明显u使用的是Angular 4.3+。在此版本之后,已删除.map amd.json()。。
试试这个---
}
除去--
因为您使用的是HttpClient,所以它的明显u使用的是Angular 4.3+。在此版本之后,已删除.map amd.json()。。
试试这个---
}
除去--
谢谢你的详尽回答。你能告诉我可以参考的最好的资源是什么吗?它能帮助我知道哪些已经被弃用,哪些还没有被弃用?很明显,我下面的教程已经过时了。我建议您参考文档,不推荐的API会被标记,例如,检查此文档。谢谢您的详细答案。你能告诉我可以参考的最好的资源是什么吗?它能帮助我知道哪些已经被弃用,哪些还没有被弃用?很明显,我下面的教程是过时的。我建议您参考文档,不推荐的API会被标记,例如检查此文档