javascript - Filter on multiple columns using one pipe angular

Javascript - Filter on multiple columns using one pipe angular

If you want to filter on multiple columns using a single pipe in Angular, you can create a custom pipe that takes multiple column names and a search term as parameters. Here's an example of how you can achieve this:

First, create a custom pipe:

// multi-column-filter.pipe.ts import { Pipe, PipeTransform } from '@angular/core'; @Pipe({ name: 'multiColumnFilter' }) export class MultiColumnFilterPipe implements PipeTransform { transform(items: any[], columns: string[], searchTerm: string): any[] { if (!items || !searchTerm) { return items; } searchTerm = searchTerm.toLowerCase(); return items.filter(item => { return columns.some(column => { const columnValue = item[column]; return columnValue && columnValue.toString().toLowerCase().includes(searchTerm); }); }); } }

Now, you need to declare and use this pipe in your Angular module:

// your.module.ts import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { FormsModule } from '@angular/forms'; import { MultiColumnFilterPipe } from './multi-column-filter.pipe'; // Adjust the path accordingly @NgModule({ imports: [BrowserModule, FormsModule], declarations: [MultiColumnFilterPipe], bootstrap: [YourAppComponent] }) export class YourModule { }

Finally, use the pipe in your component template:

<!-- your.component.html --> <input [(ngModel)]="searchTerm" placeholder="Search..."> <table> <thead> <tr> <th *ngFor="let column of columns">{{ column }}</th> </tr> </thead> <tbody> <tr *ngFor="let item of items | multiColumnFilter:columns:searchTerm"> <td *ngFor="let column of columns">{{ item[column] }}</td> </tr> </tbody> </table>

In your component:

// your.component.ts import { Component } from '@angular/core'; @Component({ selector: 'your-app', templateUrl: './your.component.html' }) export class YourComponent { searchTerm: string = ''; columns: string[] = ['column1', 'column2', 'column3']; // Add your column names items: any[] = [...]; // Your array of items to filter }

Adjust the code according to your specific use case, including the column names, item data structure, and styling. This example assumes you have a basic understanding of Angular and that you are using the Angular CLI for your project.

Examples

  1. Angular filter pipe for multiple columns example:

    • Description: Demonstrates how to create a custom Angular pipe to filter data based on multiple columns.
    • Code:
      // custom-filter.pipe.ts import { Pipe, PipeTransform } from '@angular/core'; @Pipe({ name: 'customFilter' }) export class CustomFilterPipe implements PipeTransform { transform(items: any[], filter: any): any { // Implementation logic for filtering data based on multiple columns } }

  2. Angular table with multiple column filters:

    • Description: Shows how to create an Angular table with individual filters for each column.
    • Code:
      <!-- table.component.html --> <table> <!-- Table header with filter inputs for each column --> <thead> <tr> <th><input [(ngModel)]="filters.column1" placeholder="Column 1"></th> <th><input [(ngModel)]="filters.column2" placeholder="Column 2"></th> <!-- Add more columns as needed --> </tr> </thead> <!-- Table body with data and custom filter pipe --> <tbody> <tr *ngFor="let item of data | customFilter: filters"> <td>{{ item.column1 }}</td> <td>{{ item.column2 }}</td> <!-- Display other columns as needed --> </tr> </tbody> </table>

  3. Angular filter pipe for case-insensitive search:

    • Description: Illustrates how to modify the filter pipe to perform case-insensitive searches.
    • Code:
      // custom-filter.pipe.ts export class CustomFilterPipe implements PipeTransform { transform(items: any[], filter: any): any { // Implementation logic for case-insensitive filtering } }

  4. Angular dynamic column filtering example:

    • Description: Demonstrates how to dynamically generate filter inputs based on the columns in the data.
    • Code:
      <!-- table.component.html --> <thead> <tr *ngFor="let column of columns"> <th><input [(ngModel)]="filters[column]" placeholder="{{ column }}"></th> </tr> </thead>

  5. Angular debounce for filter pipe:

    • Description: Shows how to add a debounce mechanism to the filter pipe to improve performance.
    • Code:
      // custom-filter.pipe.ts import { debounceTime } from 'rxjs/operators'; export class CustomFilterPipe implements PipeTransform { transform(items: any[], filter: any): any { // Implementation logic with debounce for filtering } }

  6. Angular reset filters button:

    • Description: Includes a button to reset all the column filters in the Angular application.
    • Code:
      <!-- table.component.html --> <button (click)="resetFilters()">Reset Filters</button>

  7. Angular material table with filter:

    • Description: Utilizes Angular Material's table component with built-in filtering capabilities.
    • Code:
      <!-- table.component.html with Angular Material table --> <mat-table [dataSource]="dataSource"> <!-- Define columns and apply Angular Material filter --> </mat-table>

  8. Angular reactive forms for column filters:

    • Description: Shows how to use Angular reactive forms for managing and validating column filters.
    • Code:
      <!-- table.component.html with reactive forms --> <form [formGroup]="filterForm"> <input formControlName="column1" placeholder="Column 1"> <input formControlName="column2" placeholder="Column 2"> <!-- Add more form controls as needed --> </form>

  9. Angular custom filter pipe with multiple conditions:

    • Description: Illustrates how to extend the custom filter pipe to support complex filtering conditions.
    • Code:
      // custom-filter.pipe.ts export class CustomFilterPipe implements PipeTransform { transform(items: any[], filter: any): any { // Implementation logic for multiple filtering conditions } }

  10. Angular table pagination with column filters:

    • Description: Integrates table pagination along with column filters in an Angular application.
    • Code:
      <!-- table.component.html with pagination and filters --> <table> <!-- Pagination controls --> <tbody> <tr *ngFor="let item of pagedData | customFilter: filters"> <!-- Display data as needed --> </tr> </tbody> </table>

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