Angular 6 Checkbox Selector - Filtering Made Easy

How can I filter a list of JSON objects (Products) by the 'category' variable using checkboxes?

An example product object is shown below: 

  {
  'bikeId': 6,
  'bikeName': 'Kids blue bike',
  'bikeCode': 'KB-3075',
  'releaseDate': 'June 28, 2016',
  'description': 'Kids blue bike with stabilizers',
  'category': 'kids',
  'price': 290.00,
  'starRating': 4.8,
  'imageUrl': 'https://openclipart.org/image/2400px/svg_to_png/1772/bike-kid.png'
}

The current ngFor Loop code is as follows: 

   <tr *ngFor="let product of products">
                       <td><img *ngIf='showImage' 
                         [src]='product.imageUrl' 
                        [title]='product.bikeName'
                        [style.width.px]='imageWidth'></td>
                       <td>{{product.bikeName}}</td>
                       <td>{{product.bikeCode}}</td>
                       <td>{{product.releaseDate}}</td>
                           <td>{{product.price}}</td>
                           <td>{{product.starRating}}</td>
</tr>

And the current Checkboxes are as follows:

 <input type="checkbox" name="All" value="true" /> Mens 
                <input type="checkbox" name="All" value="true" /> Womens 
                <input type="checkbox" name="All" value="true" /> Kids

I'm posting this question after searching forums all day with no luck. Many answers I found were either outdated or not working when I tested the code. Any assistance would be greatly appreciated.

typescriptcheckboxangular6

Answer №1

It's surprising that you struggled to find an example online, considering the numerous ways to tackle this issue. My approach is just one method among many.

In my solution, I maintain the original product source untouched but create a secondary array to store the displayed products. Each checkbox is linked to a property of a filter model, and when there's a change, I trigger filterChange() to update the filtered products based on that model.

You can skip using NgModel and dual binding by dynamically generating filters from an array, which is beneficial for scalability as your application expands. Additionally, you could leverage Observables or implement a Pipe to filter the array within NgFor loop. The options are limitless.

MyComponent.ts

export class MyComponent {
  filter = { mens: true, womens: true, kids: true };
  products: Product[] = []
  filteredProducts = Product[] = [];

  filterChange() {
    this.filteredProducts = this.products.filter(x => 
       (x.category === 'kids' && this.filter.kids)
       || (x.category === 'mens' && this.filter.mens)
       || (x.category === 'womens' && this.filter.womens)
    );
  }
}

MyComponent.html

<tr *ngFor="let product of filteredProducts"> <!-- ... --> </tr>
<!-- ... --->
<input type="checkbox" [(ngModel)]="filter.mens" (ngModelChange)="filterChange()" /> Mens 
<input type="checkbox" [(ngModel)]="filter.womens" (ngModelChange)="filterChange()" /> Womens 
<input type="checkbox" [(ngModel)]="filter.kids" (ngModelChange)="filterChange()" /> Kids

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