javascript - 使用 Angular 中的一个管道过滤表中的多列

Question

Hi everyone. I want to make a custom filter for my table which intakes more than one argument to search multiple columns .. in my case right now only one argument can be passed . thanks in advance

组件.html

<tr *ngFor = "let builder of builderDetailsArray[0] | filter :'groupName': searchString; let i = index" >
    <td style="text-align: center;"><mat-checkbox></mat-checkbox></td>
    <td>{{builder.builderId}}</td>
    <td>{{builder.viewDateAdded}}</td>
    <td>{{builder.viewLastEdit}}</td>
    <td>{{builder.groupName}}</td>
    <td>{{builder.companyPersonName}}</td>
    <td style="text-align: center;"><button mat-button color="primary">UPDATE</button></td>
</tr>

管道.ts

@Pipe({
    name: "filter",
    pure:false
})

export class FilterPipe implements PipeTransform {
    transform(items: any[], field: string, value: string): any[] {
    if (!items) {
        return [];
    }
    if (!field || !value) {
        return items;
    }
    return items.filter(singleItem => 
        singleItem[field].toLowerCase().includes(value.toLowerCase()) );
}

Answer 1

在 Angular 4 中创建了多个参数管道

The code lets you search through multiple columns in your table.

Passed 2 arguments in the transform function

1. value: Which involves all the data inside the table, all columns
2. searchString: What you want to search inside the columns (inside the table).

因此，您可以在转换函数中定义要搜索的列。

在这种情况下，要搜索的列是 builderId、groupName 和 companyPersonName

管道文件

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
    name: "arrayFilter"
})

export class BuilderFilterPipe implements PipeTransform {

    transform(value:any[],searchString:string ){

       if(!searchString){
         console.log('no search')
         return value  
       }

       return value.filter(it=>{   
           const builderId = it.builderId.toString().includes(searchString) 
           const groupName = it.groupName.toLowerCase().includes(searchString.toLowerCase())
           const companyPersonName = it.companyPersonName.toLowerCase().includes(searchString.toLowerCase())
           console.log( builderId + groupName + companyPersonName);
           return (builderId + groupName + companyPersonName );      
       }) 
    }
}

What does the transform function do?

1. builderId, groupName and companyPersonName are the three fields I searched

2. builderId converted to string because our searchString is in string format.

3. toLowerCase() is used to make search accurate irrespective of user search in lowercase or uppercase

HTML:

  <tr *ngFor = "let builder of newBuilderDetailsArray | arrayFilter:search" >
      <td>{{builder.builderId}}</td>
      <td>{{builder.groupName}}</td>
      <td>{{builder.companyPersonName}}</td> 
  </tr>

Make sure your filter.ts file added to module.ts file