https://catalog.biblsinod.ru/jirbis2/components/com_irbis/js/jquery.pagination.js

1/**
2 * This jQuery plugin displays pagination links inside the selected elements.
3 * 
4 * This plugin needs at least jQuery 1.4.2
5 *
6 * @author Gabriel Birke (birke *at* d-scribe *dot* de)
7 * @version 2.2
8 * @param {int} maxentries Number of entries to paginate
9 * @param {Object} opts Several options (see README for documentation)
10 * @return {Object} jQuery Object
11 */
12 (function($){
13	/**
14	 * @class Class for calculating pagination values
15	 */
16	$.PaginationCalculator = function(maxentries, opts) {
17		this.maxentries = maxentries;
18		this.opts = opts;
19	}
20	
21	$.extend($.PaginationCalculator.prototype, {
22		/**
23		 * Calculate the maximum number of pages
24		 * @method
25		 * @returns {Number}
26		 */
27		numPages:function() {
28			return Math.ceil(this.maxentries/this.opts.items_per_page);
29		},
30		/**
31		 * Calculate start and end point of pagination links depending on 
32		 * current_page and num_display_entries.
33		 * @returns {Array}
34		 */
35		getInterval:function(current_page)  {
36			var ne_half = Math.floor(this.opts.num_display_entries/2);
37			var np = this.numPages();
38			var upper_limit = np - this.opts.num_display_entries;
39			var start = current_page > ne_half ? Math.max( Math.min(current_page - ne_half, upper_limit), 0 ) : 0;
40			var end = current_page > ne_half?Math.min(current_page+ne_half + (this.opts.num_display_entries % 2), np):Math.min(this.opts.num_display_entries, np);
41			return {start:start, end:end};
42		}
43	});
44	
45	// Initialize jQuery object container for pagination renderers
46	$.PaginationRenderers = {}
47	
48	/**
49	 * @class Default renderer for rendering pagination links
50	 */
51	$.PaginationRenderers.defaultRenderer = function(maxentries, opts) {
52		this.maxentries = maxentries;
53		this.opts = opts;
54		this.pc = new $.PaginationCalculator(maxentries, opts);
55	}
56	$.extend($.PaginationRenderers.defaultRenderer.prototype, {
57		/**
58		 * Helper function for generating a single link (or a span tag if it's the current page)
59		 * @param {Number} page_id The page id for the new item
60		 * @param {Number} current_page 
61		 * @param {Object} appendopts Options for the new item: text and classes
62		 * @returns {jQuery} jQuery object containing the link
63		 */
64		createLink:function(page_id, current_page, appendopts){
65			var lnk, np = this.pc.numPages();
66			page_id = page_id<0?0:(page_id<np?page_id:np-1); // Normalize page id to sane value
67			appendopts = $.extend({text:page_id+1, classes:""}, appendopts||{});
68			if(page_id == current_page){
69				lnk = $("<span class='current'>" + appendopts.text + "</span>");
70			}
71			else
72			{
73				lnk = $("<a>" + appendopts.text + "</a>")
74					.attr('href', this.opts.link_to.replace(/__id__/,page_id));
75			}
76			if(appendopts.classes){ lnk.addClass(appendopts.classes); }
77			if(appendopts.rel){ lnk.attr('rel', appendopts.rel); }
78			lnk.data('page_id', page_id);
79			return lnk;
80		},
81		// Generate a range of numeric links 
82		appendRange:function(container, current_page, start, end, opts) {
83			var i;
84			for(i=start; i<end; i++) {
85				this.createLink(i, current_page, opts).appendTo(container);
86			}
87		},
88		getLinks:function(current_page, eventHandler) {
89			var begin, end,
90				interval = this.pc.getInterval(current_page),
91				np = this.pc.numPages(),
92				fragment = $("<div class='pagination'></div>");
93			
94			// Generate "Previous"-Link
95			if(this.opts.prev_text && (current_page > 0 || this.opts.prev_show_always)){
96				fragment.append(this.createLink(current_page-1, current_page, {text:this.opts.prev_text, classes:"prev",rel:"prev"}));
97			}
98			// Generate starting points
99			if (interval.start > 0 && this.opts.num_edge_entries > 0)
100			{
101				end = Math.min(this.opts.num_edge_entries, interval.start);
102				this.appendRange(fragment, current_page, 0, end, {classes:'sp'});
103				if(this.opts.num_edge_entries < interval.start && this.opts.ellipse_text)
104				{
105					$("<span>"+this.opts.ellipse_text+"</span>").appendTo(fragment);
106				}
107			}
108			// Generate interval links
109			this.appendRange(fragment, current_page, interval.start, interval.end);
110			// Generate ending points
111			if (interval.end < np && this.opts.num_edge_entries > 0)
112			{

113				if(np-this.opts.num_edge_entries > interval.end && this.opts.ellipse_text)
114				{
115					$("<span>"+this.opts.ellipse_text+"</span>").appendTo(fragment);
116				}
117				begin = Math.max(np-this.opts.num_edge_entries, interval.end);
118				this.appendRange(fragment, current_page, begin, np, {classes:'ep'});
119				
120			}
121			// Generate "Next"-Link
122			if(this.opts.next_text && (current_page < np-1 || this.opts.next_show_always)){
123				fragment.append(this.createLink(current_page+1, current_page, {text:this.opts.next_text, classes:"next",rel:"next"}));
124			}
125			$('a', fragment).click(eventHandler);
126			return fragment;
127		}
128	});
129	
130	// Extend jQuery
131	$.fn.pagination = function(maxentries, opts){
132		
133		// Initialize options with default values
134		opts = $.extend({
135			items_per_page:10,
136			num_display_entries:11,
137			current_page:0,
138			num_edge_entries:0,
139			link_to:"#",
140			prev_text:"Prev",
141			next_text:"Next",
142			ellipse_text:"...",
143			prev_show_always:true,
144			next_show_always:true,
145			renderer:"defaultRenderer",
146			show_if_single_page:false,
147			load_first_page: false,
148			callback:function(){return false;}
149		},opts||{});
150		
151		var containers = this,
152			renderer, links, current_page;
153		
154		/**
155		 * This is the event handling function for the pagination links. 
156		 * @param {int} page_id The new page number
157		 */
158		function paginationClickHandler(evt){
159			var links, 
160				new_current_page = $(evt.target).data('page_id'),
161				continuePropagation = selectPage(new_current_page);
162			if (!continuePropagation) {
163				evt.stopPropagation();
164			}
165			return continuePropagation;
166		}
167		
168		/**
169		 * This is a utility function for the internal event handlers. 
170		 * It sets the new current page on the pagination container objects, 
171		 * generates a new HTMl fragment for the pagination links and calls
172		 * the callback function.
173		 */
174		function selectPage(new_current_page) {
175			// update the link display of a all containers
176			containers.data('current_page', new_current_page);
177			links = renderer.getLinks(new_current_page, paginationClickHandler);
178			containers.empty();
179			links.appendTo(containers);
180			// call the callback and propagate the event if it does not return false
181			var continuePropagation = opts.callback(new_current_page, containers);
182			return continuePropagation;
183		}
184		
185		// -----------------------------------
186		// Initialize containers
187		// -----------------------------------
188                current_page = parseInt(opts.current_page);
189		containers.data('current_page', current_page);
190		// Create a sane value for maxentries and items_per_page
191		maxentries = (!maxentries || maxentries < 0)?1:maxentries;
192		opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0)?1:opts.items_per_page;
193		
194		if(!$.PaginationRenderers[opts.renderer])
195		{
196			throw new ReferenceError("Pagination renderer '" + opts.renderer + "' was not found in jQuery.PaginationRenderers object.");
197		}
198		renderer = new $.PaginationRenderers[opts.renderer](maxentries, opts);
199		
200		// Attach control events to the DOM elements
201		var pc = new $.PaginationCalculator(maxentries, opts);
202		var np = pc.numPages();
203		containers.off('setPage').on('setPage', {numPages:np}, function(evt, page_id) { 
204				if(page_id >= 0 && page_id < evt.data.numPages) {
205					selectPage(page_id); return false;
206				}
207		});
208		containers.off('prevPage').on('prevPage', function(evt){
209				var current_page = $(this).data('current_page');
210				if (current_page > 0) {
211					selectPage(current_page - 1);
212				}
213				return false;
214		});
215		containers.off('nextPage').on('nextPage', {numPages:np}, function(evt){
216				var current_page = $(this).data('current_page');
217				if(current_page < evt.data.numPages - 1) {
218					selectPage(current_page + 1);
219				}
220				return false;
221		});
222		containers.off('currentPage').on('currentPage', function(){
223				var current_page = $(this).data('current_page');
224				selectPage(current_page);
225				return false;
226		});
227		
228		// When all initialisation is done, draw the links
229		links = renderer.getLinks(current_page, paginationClickHandler);
230		containers.empty();
231		if(np > 1 || opts.show_if_single_page) {

232			links.appendTo(containers);
233		}
234		// call callback function
235		if(opts.load_first_page) {
236			opts.callback(current_page, containers);
237		}
238	} // End of $.fn.pagination block
239	
240})(jQuery);