Arrange the list in ascending order - Ionic

When a user performs a search, they receive a list of items matching their query. I am struggling to figure out how to sort this list by the lowest number of ingredients included in each item. For example, if I search for "potato" and "leek," I want the items with the lowest number of total ingredients to be listed first.

My Ion-list currently looks like this:

<ion-list>
  <ion-item *ngFor="let item of recipes" (click)="goToDetails(item.id)">
    <div class="thumb">
      <img src="{{item.smallImageUrls}}">
    </div>
    <div class="item-text">
      <div class="inner">
        <div class="title">
          <h1>{{item.recipeName}}</h1>
        </div>
        <div class="rating">
          <rating [(ngModel)]="item.rating"></rating>
        </div>
        <div class="time">
          <p>{{item.totalTimeInSeconds | HoursMinutesSeconds}} minutes</p>
        </div>
        <div class="ingredients">
          <p>{{item.ingredients.length}} Ingredients</p>
        </div>
      </div>
    </div>
  </ion-item>
</ion-list>

I am looking to implement a sorting mechanism based on the

item.ingredients.length

to automatically arrange the entire list from low to high.

Answer №1

You are unable to utilize the pipe for sorting since within *ngFor, you only have access to individual elements and not the entire collection for sorting. Therefore, it is recommended to sort the complete array in your typescript file before iterating through it:

recipes.sort(function(a,b){
  return a.ingredients.length - b.ingredients.length; 
});

Answer №2

One possible solution could involve manipulating the recipes array that originates from a service. By implementing sorting in your RecipeService, you can arrange the elements accordingly.

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
...
@Injectable()
export class RecipeService {
  ...
  constructor(private http: HttpClient) { }

  getRecipes(): Observable<Recipe> {
    return this.http
      .get<Recipe[]>(`${url}`)
      .pipe(map(recipes: Array<Recipe>) => this.sortArray(recipes)), this.catchHttpErrors());
  }
  ...
  sortArray(arr: Array<Recipe>) {
    return arr.sort((a: Recipe, b: Recipe) => {
      if (a.ingredients.length < b.ingredients.length) {
        return -1;
      } else if (a.ingredients.length > b.ingredients.length) {
        return 1;
      }
      return 0;
    });
  }
}

Another approach might look something like this...

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