In web development, it is common to work with large amounts of data that need to be displayed in chunks or pages. Pagination allows us to split this data into smaller parts and display them one page at a time. In this blog post, we will explore how to handle pagination in JSON data using JavaScript.

Importing JSON Data

Before we dive into handling pagination, let’s first import our JSON data. For this example, let’s assume we have a JSON file called data.json that contains an array of objects.

const data = require("./data.json");

Please make sure to modify the file path depending on the location of your JSON file.

Implementing Pagination

To implement pagination, we need to keep track of the current page number and the number of items to display per page. We can initialize these values as follows:

let currentPage = 1;
const itemsPerPage = 10;

Next, we need to create a function that will calculate the starting and ending indexes based on the current page number and items per page.

function getPaginationRange(page, itemsPerPage) {
  const startIndex = (page - 1) * itemsPerPage;
  const endIndex = page * itemsPerPage;

  return { startIndex, endIndex };
}

Now, we can use these indexes to extract the data for the current page.

const { startIndex, endIndex } = getPaginationRange(currentPage, itemsPerPage);
const paginatedData = data.slice(startIndex, endIndex);

Displaying Paginated Data

With the paginated data in hand, we can now display it on our web page. This can be done by iterating over the paginatedData array and rendering each item in HTML.

paginatedData.forEach(item => {
  // Render item in your HTML element here
});

Updating Pagination

To facilitate navigation between pages, we need to provide previous and next buttons that allow the user to move between pages. Here is an example of how you can update the page number and rerender the paginated data when the buttons are clicked.

function goToPreviousPage() {
  if (currentPage > 1) {
    currentPage--;
    renderPaginatedData();
  }
}

function goToNextPage() {
  const totalPages = Math.ceil(data.length / itemsPerPage);

  if (currentPage < totalPages) {
    currentPage++;
    renderPaginatedData();
  }
}

Remember to attach these functions to the corresponding button elements in your HTML.

Conclusion

Handling pagination in JSON data using JavaScript is crucial when working with large datasets. By implementing pagination, you can improve performance and enhance the user experience on your web page. Keep in mind that the code provided in this blog post is a basic implementation and can be customized further based on your specific requirements.

#javascript #pagination