Javascript Pagination Class

Provides calculations for paging elements.

Class properties

• total - total items in list
• items = [ firstIndex, lastIndex ] - Indexes of first and last items to be listed on current page
• page - current page
• perPage = 10 - how many items to be displayed on page
• pagesPerPage = 10 - maximum page numbers to be displayed on page at once
• totalPages - total pages count
• pages = [ minPage, maxPage ] - start and end numbers of pages to be displayed on current page
• prev - previous page number or false if first page
• next - next page number or false if last page
• first - detects whether first page is selected
• last - detects whether last page is selected

Example of usage

Initialization

var pagination, pagingInfo;

pagination = new Pagination({
	total: 100,
	perPage: 5,
	page: 15
});

pagingInfo = pagination.toJSON();

Outputs:

pagingInfo -> {
	page: 15,
	perPage: 5,
	total: 100,
	items: [70, 75],

	prev: 14,
	next: 16,

	first: false,
	last: false,

	pages: [11, 20],
	totalPages: 20,
	pagesPerPage: 10
};

Updating existing instance

// set all changed properties
pagination.set({
	page: 3,
	perPage: 16
});
// then
pagingInfo = pagination.toJSON();

Outputs:

pagingInfo -> {
	page: 3,
	perPage: 16,
	total: 100,
	items: [32, 48],

	prev: 2,
	next: 4,

	first: false,
	last: false,

	pages: [1, 7],
	totalPages: 7,
	pagesPerPage: 10
};