When attempting to use the 'orderBy' pipe in conjunction with async functions, an error is thrown indicating that the pipe cannot be found

Question

When attempting to use the 'orderBy' pipe in conjunction with async functions, an error is thrown indicating that the pipe cannot be found

When trying to implement the orderBy pipe in ngFor along with async pipe, I encountered an error as follows:

ERROR Error: Uncaught (in promise): Error: Template parse errors:
The pipe 'orderBy' could not be found ("
          </div>
          <div
            *ngFor="let a of arr | async | orderBy: 'b': ng:///TestModule/TestComponent.html@95:34
Error: Template parse errors:
The pipe 'orderBy' could not be found ("
          </div>
          <div

The issue arises when attempting to use the orderBy pipe on observables returned by arr. It works fine without orderBy, but throws an error when trying to incorporate it:

<div *ngFor="let a of arr | async | orderBy: 'b'> </div>

angular typescript rxjs angular6 observable

Answer 1

Answer №1

My suggestion would be to avoid sorting through a custom pipe in Angular. The orderBy pipe was removed for a reason, as it tends to be inefficient in its execution. Since you are working with an observable stream, consider adding the sorting logic as an operator in your component like so:

this.arr = this.arr.pipe(map(arr => arr.sort((a,b) => a > b))); // feel free to customize sort logic

This approach ensures that sorting only happens when necessary, specifically when there are changes to the array. By doing this, you eliminate the need for pipes and keep your sorting actions within your code where they belong.

Answer 2

My suggestion would be to avoid sorting through a custom pipe in Angular. The orderBy pipe was removed for a reason, as it tends to be inefficient in its execution. Since you are working with an observable stream, consider adding the sorting logic as an operator in your component like so:

this.arr = this.arr.pipe(map(arr => arr.sort((a,b) => a > b))); // feel free to customize sort logic

This approach ensures that sorting only happens when necessary, specifically when there are changes to the array. By doing this, you eliminate the need for pipes and keep your sorting actions within your code where they belong.

Answer 3

Answer №2

Angular 2+ differs from AngularJS in that it no longer supports several built-in pipes, as highlighted here.

To utilize a pipe, you must create a custom one:

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

@Pipe({name: 'yourPipeName'})
export class ExponentialStrengthPipe implements PipeTransform {
  // The transform method of the pipe takes the data before the '|' symbol in the template as its first argument, with other parameters being optional

  // Sorting logic goes here
  transform(input: Array<any>, para1, para2) {
    return input.sort( (a,b) => a>b);
  }
}

Next, declare your newly created pipe in the module so you can use it in your template like this:

<div *ngFor="let a of arr | async | yourPipeName> </div>

Answer 4

Angular 2+ differs from AngularJS in that it no longer supports several built-in pipes, as highlighted here.

To utilize a pipe, you must create a custom one:

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

@Pipe({name: 'yourPipeName'})
export class ExponentialStrengthPipe implements PipeTransform {
  // The transform method of the pipe takes the data before the '|' symbol in the template as its first argument, with other parameters being optional

  // Sorting logic goes here
  transform(input: Array<any>, para1, para2) {
    return input.sort( (a,b) => a>b);
  }
}

Next, declare your newly created pipe in the module so you can use it in your template like this:

<div *ngFor="let a of arr | async | yourPipeName> </div>

When attempting to use the 'orderBy' pipe in conjunction with async functions, an error is thrown indicating that the pipe cannot be found

Answer №1

Answer №2

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