pagination-logic

Pure Javascript pagination logic without UI component

Installation

npm install pagination-logic

Usage

var pagination = require('pagination-logic');

/*
Provide a pageObject
(total -- Number of items that will be paginated
 single -- Number of items per page
 pageSize -- Number of pageItem that will be shown
 currentPage -- Number of the page you want to get
 pageLinkRule -- a funtion you link to the page you want, param is pageNumber
)
*/
var paginationResult = pagination(pageObject)

Result Attributes

Name	Description
pages	A list about the elements showed in current page, each elements contains {number, link, isActive}
pageCount	total page number
currentPage	the currently active page
hasPrevious	whether the current page has previous page
hasNext	whether the current page has next page
pageSize	Number of elements showing in the current page
previousPage	the previous page object which contains {number, link, isActive}
nextPage	the next page object which contains {number, link, isActive}
firstPage	the first page object which contains {number, link, isEllipsis}. ps: isEllipsis means whether you need '......', like 1...5,6,7,8...100
lastPage	the final page object which contains {number, link, isEllipsis}. ps: isEllipsis means whether you need '......', like 1...5,6,7,8...100

###Example

const test = require('ava');
const logicPaginate = require('../src/pagination-logic');


test('middle', function(t) {
    const input = {
        total: 50,
        single:6,
        pageSize:4,
        currentPage: 6,
        pageLinkRule: (pageNumber) => {
            return `/page/${pageNumber}`;
        }
    };
    const expectedOutput = {
           pages: [
                      {
                          number: 4,
                          link: '/page/4',
                          isActive: false,
                      },
                      {
                          number: 5,
                          link: '/page/5',
                          isActive: false,
                      },
                      {
                          number: 6,
                          link: '/page/6',
                          isActive: true,
                      },
                      {
                          number: 7,
                          link: '/page/7',
                          isActive: false,
                      }
                  ],
                  pageCount: 9,
                  currentPage: 6,
                  hasPrevious: true,
                  hasNext: true,
                  previousPage: {
                      number: 5,
                      link: '/page/5',
                      isActive: false,
                  },
                  nextPage: {
                      number: 7,
                      link: '/page/7',
                      isActive: false,
                  },
                  pageSize: 4,
                  firstPage:{
                      number:1,
                      link: '/page/1',
                      isEllipsis: true
                  },
                  lastPage:{
                      number:9,
                      link: '/page/9',
                      isEllipsis: true
                  },

       };
    t.deepEqual(logicPaginate(input), expectedOutput)
});