@jalik/pagination-helper

@jalik/pagination-helper

Create and manipulate paginations fast and easy.

Features

• Handle offset based paginations
• Get calculated page numbers (first, previous, next, last)
• Get calculated total pages
• TypeScript declarations ♥
• 50+ tests

Creating an offset pagination

import { OffsetPagination } from '@jalik/pagination-helper'

// Creates the pagination.
const pagination = new OffsetPagination({
  // Set the limit per page.
  limit: 10,
  // (optional) Set the first page (1 by default) 
  minPage: 1,
  // (optional) Set the initial offset (0 by default).
  offset: 0,
  // (optional) set the page number, to calculate the offset automatically.
  // If present, it will be used instead of offset.
  page: 1,
  // Set the total number of elements.
  totalElements: 200
})

// Compares with another pagination.
// In this case, it returns false because the limit is different.
pagination.equals(new OffsetPagination({ limit: 15, page: 1, totalElements: 200 }))

// Returns the closest valid page.
// In this case, it returns 20 since the last page is 20.
pagination.getClosestPage(42)

// Returns the first page (see minPage option)
pagination.getFirstPage()

// Returns the last page.
// In this case, it returns 20 (20 = 200 / 10).
pagination.getLastPage()

// Returns the maximum value for limit.
pagination.getMaxLimit()

// Returns the current limit.
pagination.getLimit()

// Returns the next page.
pagination.getNextPage()

// Returns the current offset.
pagination.getOffset()

// Returns the corresponding offset of a page.
// In this case, it returns 40 (40 = (5 * 10) - 10).
pagination.getOffsetFromPage(5)

// Returns the current page.
pagination.getPage()

// Returns the corresponding page of an offset.
// In this case, it returns 3 (3 = (20 / 10) + 1).
pagination.getPageFromOffset(20)

// Returns the previous page.
pagination.getPreviousPage()

// Returns the total number of elements of the pagination.
pagination.getTotalElements()

// Returns the page count.
pagination.getTotalPages()

// Checks if there is a previous page.
// This would return false if page was the last.
pagination.hasNext()

// Checks if there is a previous page.
// This would return false if page was the first.
pagination.hasPrevious()

// Checks if page is between 1 and page count (inclusive).
// In this case, it returns false because limit is 10 and total is 200,
// which gives a total of 20 pages and 50 is above this value.
pagination.isPageValid(50)

// Sets the pagination limit (used to calculate page count).
pagination.setLimit(25)

// Sets the offset (used to calculate the page.
// Note: you may prefer to use setPage() instead of setOffset().
pagination.setOffset(20)

// Sets the current page (same as setOffset(20)).
pagination.setPage(2)

// Sets the total number of elements.
pagination.setTotalElements(999)

Changelog

History of releases is in the changelog.

License

The code is released under the MIT License.