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Learn how to customize pagination in your PrimeNG `p-table` so that row numbers continue sequentially across pages, enhancing user experience in Angular applications.
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How to Change Row Index Number of p-table on Paginator Event in PrimeNG

When working with Angular applications that utilize PrimeNG components, you may encounter a common issue when handling pagination in a p-table. Specifically, the row index (or serial number) resets to 1 on each page, which can be confusing for users who expect a continuous sequence across pages. This guide will guide you through solving this issue by correctly displaying row indices that persist across pagination changes.

Understanding the Problem

What’s happening?

In your application, you're trying to list products in a PrimeNG p-table, and each product has a serial number generated using rowIndex. Here’s the initial setup of your table:

[[See Video to Reveal this Text or Code Snippet]]

This works perfectly on the first page, but when you navigate to another page using the paginator, the indices reset, displaying numbers starting from 1 again:

Page 1:

1 - Product A

2 - Product B

Page 2:

1 - Product C

2 - Product D

This can lead to confusion as users expect to see:

Page 2:

11 - Product C

12 - Product D

The Cause of the Issue

The problem arises because rowIndex is a zero-based index that starts counting from 0 for each page. When you click to navigate between pages, it does not account for the total number of items displayed prior to the current page, making it impossible to maintain sequential numbering across pages.

The Solution

Modifying the HTML Template

The fix is simple: you need to adjust the row index in your template to account for the total number of items already displayed. You can achieve this by utilizing a variable that maintains the starting index for the current page.

Here’s the necessary adjustment to your existing code:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Modification

first: This variable holds the index of the first item on the current page. By adding first, you ensure that the numbering starts from where the previous page ends.

rowIndex + 1: Since rowIndex starts from 0 (for the first item on the current page), adding 1 adjusts it to be user-friendly, starting from 1 instead of 0.

Complete Example Structure

Along with the changes made to the Row Index in the HTML template, ensure your pagination setup looks like this:

Pagination Component

[[See Video to Reveal this Text or Code Snippet]]

Pagination Methods in Your Component

[[See Video to Reveal this Text or Code Snippet]]

The Service Code

Make sure your service code correctly fetches the products based on pagination parameters:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these modifications, your p-table will successfully display a row index that continues sequentially across different pages, greatly enhancing user experience. Say goodbye to confusing resets and welcome a smoother navigation experience in your PrimeNG tables! If you have any further concerns or questions, feel free to reach out or leave a comment!