What steps should I take to resolve the issue of "Error: The pipe 'filter' could not be located! Error: The pipe 'filter' could not be found!" in Angular version 10?

I am encountering an issue with a filter that is supposed to search for a specific name and retrieve the data containing that name. However, I am only seeing an error in the browser console, and the page is not displaying as expected.

Here is the HTML code:

<div class="content">
<div class="container">
<div class="row">
<div class="col-xs-12 col-sm-6 col-md-4" style="padding-bottom: 15px;" >
<div class="card_book">
<div class="card">
 <div class="card-body text-center">
    <form>
    <fieldset>
          
    <div class="form-group">
      <input type="text" class="form-control" name="filterPost" placeholder="Nombre" [(ngModel)]="filterPost">
      <br>   
    </div> 
  </fieldset>
  </form>
  </div></div></div></div></div></div>
        
        <div class="container">
            <div class="row">
   <div class="col-xs-12 col-sm-6 col-md-4" style="padding-bottom: 15px;" *ngFor="let contacts of contacts | filtro:filterPost">
     <div class="card_book">
       <div class="card">
         <div class="card-body text-center">
                      
                      <h3>Nombre: {{contacts.name}}</h3>
                      <h5>Edad: {{contacts.number}}</h5>
                      <h5>Email: {{contacts.email}}</h5>
                      <h5 class="card-text">Fecha de nacimiento: {{contacts.date}}</h5>
                      <h6 style="color: red;">Id: {{contacts.id}}</h6>
                      <button type="button" class="btn btn-primary" (click)="generarPDF()">
                      <img src="assets/img/descargar.png" alt="DESCARGAR PDF" title="Descargar pdf"> DESCARGAR PDF
             
                      </button>
                    
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
    </div>

The TypeScript logic is as follows:

filterPost = '';

It seems like the issue might be related to the pipe function. Here is the pipe transformation function:

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

@Pipe({
  name: 'filtro'
})
export class FiltroPipe implements PipeTransform {

  transform(value: any, arg: any): any {
    if (arg === '' || arg.length < 3) return value;
    const resultPosts = [];
    for (const post of value) {
      if (post.email.toLowerCase().indexOf(arg.toLowerCase()) > -1) {
        resultPosts.push(post);
      };
    };
    return resultPosts;
  }

}

This pipe has already been imported into the module, but there still seems to be an error. The Angular module setup looks like this:

import {FormsModule} from '@angular/forms';
import { FiltroPipe } from './pipes/filtro.pipe'




@NgModule({
  declarations: [
    FiltroPipe, 
  AppComponent,
  SendEmailComponent, 
  NavbarComponent,
  SidebarComponent,
  InactivityTimerComponent,
 
   ],
   
  imports: [
    BrowserModule,
    AppRoutingModule,
    ReactiveFormsModule,
    AngularFireModule.initializeApp(environment.firebaseConfig),
    AngularFirestoreModule,
    AngularFireAuthModule, FormsModule
  ],
  providers: [AuthService, CanPaginaPrincipalGuard, AngularFirestore,DataDbService, 
   
  
  ],

 
  bootstrap: [AppComponent]
})
export class AppModule { }

Answer №1

To utilize it, import the nearest module or app.module.ts

Ensure to include the pipe in the declarations section when using it in HTML (e.g. | 'pipename')

 @NgModule({
    // ---,
    declarations:[],
    // ----,

If utilizing the pipe in a .ts file, include it in the providers section (e.g. pipename.transform())

 @NgModule({
    // ----,
    providers:[],
    // ----

Answer №2

To enable FiltroPipe, ensure that you include it in the providers section of your component's TypeScript file. Once this is done, the functionality should be operational.

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