我正在尝试创建一个页面,客户可以在其中看到他所有添加的产品。为了从数据库中获取它们,我编写了一个帖子路由,在其中按用户名选择数据。我已使用高级 REST 客户端测试了此请求,它有效。
routes.js
router.post('/myProducts', (req, res, next) => {
const username = req.body.username;
Product.getProductByUsername(username, (err, products) => {
if (err){
res.json({
success: false,
message: "Something went wrong!"
});
console.log(err);
}
else {
res.json({
success: true,
message: "List of products retrieved!",
products
});
}
});
});
高级 REST 客户端响应
{
"success": true,
"message": "List of products retrieved!",
"products": [
{
"_id": "5adbac5e9eb619106ff65a39",
"name": "Car",
"price": 200,
"quantity": 1,
"username": "testUser",
"__v": 0
},
{
"_id": "5adc43049eb619106ff65a3a",
"name": "Lipstick",
"price": 2.3,
"quantity": 1,
"username": "testUser",
"__v": 0
},
{
"_id": "5adcf21c18fe1e13bc3b453d",
"name": "SuperCar",
"price": 2000,
"quantity": 1,
"username": "testUser",
"__v": 0
}
],
}
之后,我编写了一个服务来将此数据传递给前端。
产品.service.ts
import { Injectable } from '@angular/core';
import {Http, Headers} from '@angular/http';
import 'rxjs/add/operator/map';
@Injectable()
export class ProductService {
username: any;
constructor(private http: Http) { }
getProducts(username):any{
console.log(username);
let headers = new Headers();
headers.append('Content-Type', 'application/json');
return this.http.post('http://localhost:3000/products/myProducts', username, {headers: headers})
.map(res => res.json());
}
}
并尝试在我的组件中使用此服务从 POST 请求获取数据。 myproducts.component.ts
import { Component, OnInit } from '@angular/core';
import {ProductService} from '../../services/product.service'
@Component({
selector: 'app-myproducts',
templateUrl: './myproducts.component.html',
styleUrls: ['./myproducts.component.css']
})
export class MyproductsComponent implements OnInit {
userString: any;
user:any;
username: String;
products: Object;
constructor(private productService: ProductService) { }
ngOnInit() {
this.userString = localStorage.getItem('user');
this.user = JSON.parse(this.userString);
this.username = this.user.username;
console.log(this.username);
this.productService.getProducts(this.username).subscribe(myProducts => {
this.products = myProducts.products;
},
err => {
console.log(err);
return false;
});
}
}
我相信我在这里做错了什么。因为我收到 404 BAD 请求,然后解析错误,因为请求期望响应为 json 格式,但由于错误请求而以 html 格式获取响应。你能帮我弄清楚我做错了什么吗?我几乎是自学成才的,但理解这一切对我来说有点复杂。谢谢!
最佳答案
您的问题在于您发送用户名的方式。这是一个字符串,而在服务器上 req.body
是一个正在寻找名为 username
的 key 的对象,但它没有找到。
因此,您可以发送一个对象:
return this.http.post('http://localhost:3000/products/myProducts', {username : username},
{headers: headers}).map(res => res.json());//^^^^ HERE ^^^^^^^^^^
关于javascript - 尝试通过 Angular 服务 POST 请求时出现错误请求 404,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49976039/