按属性值过滤对象数组 [英] Filter array of objects by property value

问题描述

我是Angular和Observable的新手.我从JSON文件中获得了产品列表.

I'm new with Angular and observables. I'm getting from a JSON file a list of products.

产品.服务

getProducts(): Observable<Product[]>{
    return this._http.get<Product[]>(this.configUrl); 
}

products.component

products: Product[];

getProducts(): void{
    this.productsService.getProducts()
        .subscribe(products => this.products = products);
}

product.ts

export interface Product {
    "quantity": number;
    "price": string;
    "available": boolean;
    "sublevel_id": number;
    "name": string;
    "id": string;
}

一切正常，但我想过滤响应以仅获取 available == true

Everything is working fine but I would like to filter the response to get only the products where available == true

我在服务和组件方面尝试了一些方法，但是没有任何效果.如何以适当的方式实现这一目标?

I tried in service and component some approaches but nothing worked. How can I achieve this in a proper way?

代码不起作用

this.products = this.products.filter(product => {
  return product.available == true
});



filterProducts(): Observable<Product[]>{

    return this.getProducts()
        .pipe(map(products => products
        .filter(product => product.available === true)));

}

JSON响应(未过滤)

 { "products": [
  {
    "quantity": 308,
    "price": "$8,958",
    "available": false,
    "sublevel_id": 3,
    "name": "aute",
    "id": "58b5a5b1b6b6c7aacc25b3fb"
  },
  {
    "quantity": 891,
    "price": "$5,450",
    "available": true,
    "sublevel_id": 3,
    "name": "mollit",
    "id": "58b5a5b117bf36cf8aed54ab"
  },
  {
    "quantity": 698,
    "price": "$17,001",
    "available": false,
    "sublevel_id": 10,
    "name": "eiusmod",
    "id": "58b5a5b18607b1071fb5ab5b"
  }
  ]}

推荐答案

尝试一下.

let o = { "products": [
  {
    "quantity": 308,
    "price": "$8,958",
    "available": false,
    "sublevel_id": 3,
    "name": "aute",
    "id": "58b5a5b1b6b6c7aacc25b3fb"
  },
  {
    "quantity": 891,
    "price": "$5,450",
    "available": true,
    "sublevel_id": 3,
    "name": "mollit",
    "id": "58b5a5b117bf36cf8aed54ab"
  },
  {
    "quantity": 698,
    "price": "$17,001",
    "available": false,
    "sublevel_id": 10,
    "name": "eiusmod",
    "id": "58b5a5b18607b1071fb5ab5b"
  }
  ]}

let filtered = o.products.filter(p => p.available===true)
console.log(filtered);

这篇关于按属性值过滤对象数组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！