PaginationHelper

PaginationHelper class is a utility class helpful for querying paging information related to an array. The class is designed to take in an array of values and an integer indicating how many items will be allowed per each page.

Install with npm or Yarn:

npm:

npm install paginator-helper --save

Yarn:

yarn add paginator-helper

Usage

The constructor takes in an array of items and an integer indicating how many items fit within a single page:

const PaginatorHelper = require('paginator-helper');

const helper = new PaginationHelper(['a','b','c','d','e','f'], 4);
helper.pageCount(); // 2
helper.itemCount(); // 6
helper.pageItemCount(0); // 4
helper.pageItemCount(1); // 2
helper.pageItemCount(2); // -1

// pageIndex takes an item index and returns the page that it belongs on
helper.pageIndex(5); // 1
helper.pageIndex(2); // 0
helper.pageIndex(20); // -1
helper.pageIndex(-10); // -1

API

itemCount()

returns the number of items within the entire collection.

pageCount()

returns the number of pages

pageItemCount(pageIndex)

returns the number of items on the current page.This method will return -1 for pageIndex values that are out of range.

pageIndex(itemIndex)

determines what page an item is on.This method will return -1 for itemIndex values that are out of range

License

MIT. Copyright (c) 2017 Renat Osmanov.