Javascript 在GET http请求中注册错误函数
我不知道如何处理Javascript 在GET http请求中注册错误函数,javascript,angular,http,http-get,Javascript,Angular,Http,Http Get,我不知道如何处理GETAPI调用的错误情况请更新我的代码片段以处理API调用失败的情况。 代码片段 从'@angular/core'导入{Injectable}; 从'@angular/Http'导入{Http,Response}; @可注射() 出口类邮政服务{ 构造函数(专用http:http){ } getPostData(){ 返回此.http.get(“https://jsonplaceholder.typicode.com/postsmap((res:Response)=>res.j
GET
API调用的错误情况请更新我的代码片段以处理API调用失败的情况。
代码片段
从'@angular/core'导入{Injectable};
从'@angular/Http'导入{Http,Response};
@可注射()
出口类邮政服务{
构造函数(专用http:http){
}
getPostData(){
返回此.http.get(“https://jsonplaceholder.typicode.com/postsmap((res:Response)=>res.json());
}
}
然后,您可以按照自己的意愿处理错误。为此,请使用
err callback
conponent.ts
constructor(private postsService:PostsService){}
ngOnInit(){
this.postsService.getPostData().subscribe(res =>{
console.log(res)
},err =>{
console.log(err)
});
}
步骤1:
导入'rxjs/add/operator/catch'代码>
第二步:
import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
@Injectable()
export class PostsService {
constructor(private http:Http) {
}
getPostData(){
return this.http.get("https://jsonplaceholder.typicode.com/posts").map((res:Response) => res.json()).catch(this.handleError);
}
handleError(err){
//Observable.throw(err);
}
}
然后当您订阅时:
this._yourService.getPostData().subscribe(res=>{
console.log(res);
},err=>{
console.log(err);
});
可能重复的
this._yourService.getPostData().subscribe(res=>{
console.log(res);
},err=>{
console.log(err);
});
1 ) Make a different Service file where you can call rest APIs.
2) And make a call from your component by injection the services.
**For Example, Assume this is Service file assume ->**
getEvents(response) {
let accesstoken = localStorage.getItem('access_token');
let headers = new HttpHeaders();
headers = headers.append('Authorization', 'Bearer ' + accesstoken);
let url = this.baseUrl + 'getEventListingToAdmin?page=' + response.page + '&perPage=10';
var data = this.http.get(url, {headers: headers});
return data;
}
**And This is a Component Part -->**
first import the service file in component
import { AdminService } from '../../admin.service';
**Then Inject it in constructor**
constructor(private admin: AdminService) { }
ngOnInit () {
this.admin.getEvents(response)
.subscribe(
(data:any) => {
//USE CAN USE HERE LOADS
this.loading = false;
// CAN CHECK THE RESPONSE STATUS
if(data.statusCode==200){
this.managersData = data.data.EventData;
this.allItems = data.data.EventCount;
}
},
error => {
//USE CAN USE HERE LOADS
this.loading = false;
// CAN CHECK THE RESPONSE STATUS
if(error.error.statusCode===401)
{
// CAN ADD SWEET ALERT
Swal(
error.error.msg,
'error'
)
}
});
}