tablesorter/beta-testing/pager-custom-controls.js

/*!
 * custom pager controls (beta) for Tablesorter - updated 8/23/2016 (v2.27.6)
  initialize custom pager script BEFORE initializing tablesorter/tablesorter pager
  custom pager looks like this:
  1 | 2 … 5 | 6 | 7 … 99 | 100
    _       _   _        _     adjacentSpacer
        _           _          distanceSpacer
  _____               ________ ends (2 default)
          _________            aroundCurrent (1 default)

 */
/*jshint browser:true, jquery:true, unused:false, loopfunc:true */
/*global jQuery: false */

;(function($) {
"use strict";

$.tablesorter = $.tablesorter || {};

$.tablesorter.customPagerControls = function(settings) {
	var defaults = {
		table          : 'table',
		pager          : '.pager',
		pageSize       : '.left a',
		currentPage    : '.right a',
		ends           : 2,                        // number of pages to show of either end
		aroundCurrent  : 1,                        // number of pages surrounding the current page
		link           : '<a href="#">{page}</a>', // page element; use {page} to include the page number
		currentClass   : 'current',                // current page class name
		adjacentSpacer : ' | ',                    // spacer for page numbers next to each other
		distanceSpacer : ' &#133; ',               // spacer for page numbers away from each other (ellipsis)
		addKeyboard    : true                      // add left/right keyboard arrows to change current page
	},
	options = $.extend({}, defaults, settings),
	$table = $(options.table),
	$pager = $(options.pager);

	$table
		.on('pagerInitialized pagerComplete', function (e, c) {
			var indx,
				p = c.pager ? c.pager : c, // using widget
				pages = $('<div/>'),
				cur = p.page + 1,
				pageArray = [],
				max = p.filteredPages,
				around = options.aroundCurrent;
			for (indx = -around; indx <= around; indx++) {
				if (cur + indx >= 1 && cur + indx <= max) {
					pageArray.push(cur + indx);
				}
			}
			if (pageArray.length) {
				// include first and last pages (ends) in the pagination
				for (indx = 0; indx < options.ends; indx++) {
					if ((indx + 1 <= max) && $.inArray(indx + 1, pageArray) === -1) {
						pageArray.push(indx + 1);
					}
					if ((max - indx > 0) && $.inArray(max - indx, pageArray) === -1) {
						pageArray.push(max - indx);
					}
				}
				// sort the list
				pageArray = pageArray.sort(function(a, b) { return a - b; });
				// only include unique pages
				pageArray = $.grep(pageArray, function(value, key) {
					return $.inArray(value, pageArray) === key;
				});
				// make links and spacers
				if (pageArray.length) {
					max = pageArray.length - 1;
					$.each(pageArray, function(indx, value) {
						pages
							.append( $(options.link.replace(/\{page\}/g, value)).toggleClass(options.currentClass, value === cur).attr('data-page', value) )
							.append( '<span>' + (indx < pageArray.length - 1 && ( pageArray[ indx + 1 ] - 1 !== value ) ? options.distanceSpacer :
								( indx >= pageArray.length - 1 ? '' : options.adjacentSpacer )) + '</span>' );
					});
				}
			}
			$pager
				.find('.pagecount')
				.html(pages.html());
		});

	// set up pager controls
	$pager
		.find(options.pageSize)
		.on('click', function () {
			$(this)
			.addClass(options.currentClass)
			.siblings()
			.removeClass(options.currentClass);
			$table.trigger('pageSize', $(this).html());
			return false;
		})
		.end()
		.on('click', options.currentPage, function() {
			var $el = $(this);
			$el
				.addClass(options.currentClass)
				.siblings()
				.removeClass(options.currentClass);
			$table.trigger('pageSet', $el.attr('data-page'));
			return false;
		});

	// make right/left arrow keys work
	if (options.addKeyboard) {
		$(document).on('keydown', function(events) {
			// ignore arrows inside form elements
			if (/input|select|textarea/i.test(events.target.nodeName)) {
				return;
			}
			if (events.which === 37) {
				// left
				$pager
					.find(options.currentPage)
					.filter('.' + options.currentClass)
					.prevAll(':not(span):first')
					.click();
			} else if (events.which === 39) {
				// right
				$pager
					.find(options.currentPage)
					.filter('.' + options.currentClass)
					.nextAll(':not(span):first')
					.click();
			}
		});
	}
};
})(jQuery);