在Angular 7 CLI项目中如何制作实时搜索框 [英] How to make real time search box, in angular 7 cli project

问题描述

我想在angular 7 cli项目中创建搜索框.我的项目后端是asp.net核心网络api.我将显示数据集数组，我想在有角度的前端应用程序中创建搜索框.如何做到这一点.

I want to make search box in angular 7 cli project. My project back-end was asp.net core web api. i will show array of data set, i want to make search box in angular front-end application. how to make that.

角度7 cli

[
  {
    "productId": 1,
    "productName": "product 1",
    "productPrice": 500,
    "productDescription": "Des 1 enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni.",
    "productCategory": "cat 1",
    "productAvailability": 0
  },
  {
   "productId": 2,
   "productName": "product 2",
   "productPrice": 1000,
   "productDescription": "Des 2 enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni.",
   "productCategory": "cat 2",
   "productAvailability": 0
   },
   {
    "productId": 3,
    "productName": "product 3",
    "productPrice": 2000,
    "productDescription": "Des 3 enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni.",
    "productCategory": "cat 2",
    "productAvailability": 0
   },
   {
    "productId": 4,
    "productName": "PRODUCT 4",
    "productPrice": 3000,
    "productDescription": "Des 4 enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni.",
    "productCategory": "cat 1",
    "productAvailability": 0
    } 
   ]

当我在搜索输入框中输入字母或数字时，只会在前端显示与输入文本相关的数据.

when i enter letter or number in search input box, only that input text related data will show in front end.

推荐答案

通过使用角管提供按角度

HTML代码

<input type="text" class="form-control" [(ngModel)]="searchText" placeholder="Search item" name="search"
    autocomplete="off">
    <div   *ngFor="let item of data| filterForUser : searchText; let i = index" >
<div> {{item.productId}}-{{item.productName}}</div>
</div>

过滤器组件

import { Pipe, PipeTransform } from '@angular/core';
@Pipe({
    name: 'filterForUser'
})
export class FilterPipeForUserSearch implements PipeTransform {
    transform(items: any[], searchText: string): any[] {
        if (!items || !searchText) return items;
        searchText = searchText.toLowerCase();
 return items.filter(it => {
            return it.productId==searchText;
        });      
    }

}

要使用所有字段进行过滤，请使用以下过滤器组件

import { Pipe, PipeTransform } from '@angular/core';
@Pipe({
    name: 'filterForUser'
})
export class FilterPipeForUserSearch implements PipeTransform {
    transform(items: any[], searchText: string): any[] {
        if (!items || !searchText) return items;
        searchText = searchText.toLowerCase();
            return items.filter((data) => this.matchValue(data,searchText)); 
    }
    matchValue(data, value) {
        return Object.keys(data).map((key) => {
           return new RegExp(value, 'gi').test(data[key]);
        }).some(result => result);
      }
}

显示结果，当用户仅在搜索框中键入任何内容

    if (!items || !searchText) return [];

注意:请在应用程序/任何其他模块中声明FilterPipeForUserSearch

NOTE: Please declare FilterPipeForUserSearch in app / any other Module

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