Angular - Enhance ngFor index while filtering

I am currently working with a list that utilizes an *ngFor loop in the template:

<li *ngFor="let product of products | filterProducts: selectedFilter; index as productId">
    <a [routerLink]="['/product', productId]">
      {{product.name}}
    </a>
</li>

While using the filterProducts pipe to sort array items based on selected options, I've encountered an issue where the productId in the template does not update when the array changes. As a result, the routerLink ends up directing me to incorrect details pages (as it still references the original productId).

Does anyone have any suggestions for solving this? Ideally, I would like the productId in the template to be updated each time I filter items in the array.

javascriptarraysangulartypescript

Answer №1

It appears that you may be attempting to utilize the index as a productId in your code. I recommend using a specific property of the product, such as product.id or product.productId, in your routerLink instead. For example:

<li *ngFor="let product of products | filterProducts: selectedFilter">
    <a [routerLink]="['/product', product.productId]">
      {{product.name}}
    </a>
</li>

Answer №2

The index is used as the productId to represent the position of a product item in the product array. This concept is akin to setting productId equal to products.indexOf(product). It is recommended to utilize the id property within the product object for this purpose.

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