Ways to sort mat-select in alphabetical order with conditional names in options

Question

Ways to sort mat-select in alphabetical order with conditional names in options

I am looking to alphabetically order a mat-select element in my Angular project.

 <mat-select [(ngModel)]="item" name="item" (selectionChange)="changeIdentificationOptions($event)">
    <mat-option *ngFor="let item of items" [value]="item">
              {{ item.name ? item.name : item.identity }}
    </mat-option>
</mat-select>

In this case, the displayed option name is determined by whether each item has a name or identity. If there is a name, it will be shown, otherwise the identity will be used.

I came across a Stack Overflow post recommending a custom orderBy pipe for sorting options alphabetically Angular Material - dropdown order items alphabetically

However, this method sorts based on a single key. I lack experience in creating custom pipes. How can I adapt this approach to meet my specific requirements?

angular typescript angular-pipe

Answer 1

Answer №1

A more efficient approach would be to develop a reusable pipe that can be utilized across the entire project. Here's an example:

import { Pipe, PipeTransform } from '@angular/core';
@Pipe({  name: 'orderBy' })
export class OrderrByPipe implements PipeTransform {

    transform(records: Array<any>, args?: any): any {
        return records.sort(function(a, b){
            if(a[args.property] < b[args.property]){
                return -1 * args.direction;
            }
            else if( a[args.property] > b[args.property]){
                return 1 * args.direction;
            }
            else{
                return 0;
            }
        });
    };
}

You can then use it like this:

<mat-option *ngFor="let item of items | orderBy: {property: column, direction: direction}"" [value]="item">
   {{ item.name ? item.name: item.identity}}
</mat-option>

Note: column=> any property, direction(1 or -1) => for ascending/descending

Click here for additional details.

Answer 2

A more efficient approach would be to develop a reusable pipe that can be utilized across the entire project. Here's an example:

import { Pipe, PipeTransform } from '@angular/core';
@Pipe({  name: 'orderBy' })
export class OrderrByPipe implements PipeTransform {

    transform(records: Array<any>, args?: any): any {
        return records.sort(function(a, b){
            if(a[args.property] < b[args.property]){
                return -1 * args.direction;
            }
            else if( a[args.property] > b[args.property]){
                return 1 * args.direction;
            }
            else{
                return 0;
            }
        });
    };
}

You can then use it like this:

<mat-option *ngFor="let item of items | orderBy: {property: column, direction: direction}"" [value]="item">
   {{ item.name ? item.name: item.identity}}
</mat-option>

Note: column=> any property, direction(1 or -1) => for ascending/descending

Click here for additional details.

Answer 3

Answer №2

It is recommended that the data be sorted alphabetically from the backend source.

There is no 'orderBy' pipe available because the Angular team expects the data to already be sorted, as indicated in the documentation at https://angular.io/guide/pipes

Answer 4

It is recommended that the data be sorted alphabetically from the backend source.

There is no 'orderBy' pipe available because the Angular team expects the data to already be sorted, as indicated in the documentation at https://angular.io/guide/pipes

Ways to sort mat-select in alphabetical order with conditional names in options

Answer №1

Answer №2

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