/*** This jQuery plugin displays pagination links inside the selected elements. ** This plugin needs at least jQuery 1.4.2 ** @author Gabriel Birke (birke *at* d-scribe *dot* de) * @version 2.0rc * @param {int} maxentries Number of entries to paginate * @param {Object} opts Several options (see README for documentation) * @return {Object} jQuery Object */ (function($){ /*** @class Class for calculating pagination values */ $.PaginationCalculator = function(maxentries, opts) { this.maxentries = maxentries;	this.opts = opts;}; $.extend($.PaginationCalculator.prototype, {/*** Calculate the maximum number of pages * @method * @returns {Number} */	numPages:function() { return Math.ceil(this.maxentries/this.opts.items_per_page);},	/*** Calculate start and end point of pagination links depending on * current_page and num_display_entries. * @returns {Array} */ getInterval:function(current_page)  {var ne_half = Math.ceil(this.opts.num_display_entries/2);	var np = this.numPages(); var upper_limit = np - this.opts.num_display_entries;	var start = current_page > ne_half ? Math.max( Math.min(current_page - ne_half, upper_limit), 0 ) : 0; var end = current_page > ne_half?Math.min(current_page+ne_half, np):Math.min(this.opts.num_display_entries, np);	return {start:start, end:end};}});/* Initialize jQuery object container for pagination renderers */ $.PaginationRenderers = {}; /*** @class Default renderer for rendering pagination links */ $.PaginationRenderers.defaultRenderer = function(maxentries, opts) {this.maxentries = maxentries;this.opts = opts;this.pc = new $.PaginationCalculator(maxentries, opts);}; $.extend($.PaginationRenderers.defaultRenderer.prototype, {	/*** Helper function for generating a single link (or a span tag if it's the current page) * @param {Number} page_id The page id for the new item * @param {Number} current_page * @param {Object} appendopts Options for the new item: text and classes * @returns {jQuery} jQuery object containing the link */ createLink:function(page_id, current_page, appendopts){var lnk, np = this.pc.numPages(); page_id = page_id<0?0:(page_id<np?page_id:np-1); /* Normalize page id to sane value */ appendopts = $.extend({text:page_id+1, classes:""}, appendopts||{}); if(page_id == current_page){ lnk = $("<span class='current'>" + appendopts.text + "</span>");} else {lnk = $("<a>" + appendopts.text + "</a>") .attr('href', this.opts.link_to.replace(/__id__/,page_id));} if(appendopts.classes){ lnk.addClass(appendopts.classes); } lnk.data('page_id', page_id); return lnk;}, /* Generate a range of numeric links */ appendRange:function(container, current_page, start, end) {var i; for(i=start; i<end; i++) { this.createLink(i, current_page).appendTo(container); }}, getLinks:function(current_page, eventHandler) { var begin, end,	interval = this.pc.getInterval(current_page), np = this.pc.numPages(), fragment = $("<div class='pagination'></div>"); /* Generate "Previous"-Link */ if(this.opts.prev_text && (current_page > 0 || this.opts.prev_show_always)){	fragment.append(this.createLink(current_page-1, current_page, {text:this.opts.prev_text, classes:"prev"}));} /* Generate starting points */ if (interval.start > 0 && this.opts.num_edge_entries > 0){end = Math.min(this.opts.num_edge_entries, interval.start); this.appendRange(fragment, current_page, 0, end); if(this.opts.num_edge_entries < interval.start && this.opts.ellipse_text) {jQuery("<span>"+this.opts.ellipse_text+"</span>").appendTo(fragment);}} /* Generate interval links */ this.appendRange(fragment, current_page, interval.start, interval.end); /* Generate ending points */ if (interval.end < np && this.opts.num_edge_entries > 0){ if(np-this.opts.num_edge_entries > interval.end && this.opts.ellipse_text){jQuery("<span>"+this.opts.ellipse_text+"</span>").appendTo(fragment);} begin = Math.max(np-this.opts.num_edge_entries, interval.end); this.appendRange(fragment, current_page, begin, np);}	 /* Generate "Next"-Link */ if(this.opts.next_text && (current_page < np-1 || this.opts.next_show_always)){fragment.append(this.createLink(current_page+1, current_page, {text:this.opts.next_text, classes:"next"}));}$('a', fragment).click(eventHandler); return fragment;}}); /* Extend jQuery */ $.fn.pagination = function(maxentries, opts){ /* Initialize options with default values */ opts = jQuery.extend({items_per_page:10,num_display_entries:10,current_page:0,num_edge_entries:0,link_to:"#",prev_text:"Prev",next_text:"Next",ellipse_text:"...",prev_show_always:true,next_show_always:true,renderer:"defaultRenderer",callback:function(){return false;}},opts||{}); var containers = this, renderer, links, current_page; /*** This is the event handling function for the pagination links. * @param {int} page_id The new page number */ function pageSelected(evt){	var links, current_page = $(evt.target).data('page_id'); containers.data('current_page', current_page);	links = renderer.getLinks(current_page, pageSelected); containers.empty(); links.appendTo(containers); var continuePropagation = opts.callback(current_page, containers); if (!continuePropagation) { if (evt.stopPropagation) {evt.stopPropagation();}else {evt.cancelBubble = true;}} return continuePropagation;} current_page = opts.current_page; containers.data('current_page', current_page); /* Create a sane value for maxentries and items_per_page */ maxentries = (!maxentries || maxentries < 0)?1:maxentries;	opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0)?1:opts.items_per_page; if(!$.PaginationRenderers[opts.renderer]){ throw new ReferenceError("Pagination renderer '" + opts.renderer + "' was not found in jQuery.PaginationRenderers object."); } renderer = new $.PaginationRenderers[opts.renderer](maxentries, opts); containers.each(function() { /* Attach control functions to the DOM element */ this.selectPage = function(page_id){ pageSelected(page_id);}; this.prevPage = function(){ var current_page = containers.data('current_page');	if (current_page > 0) {	pageSelected(current_page - 1);	return true; } else {return false;}}; this.nextPage = function(){	var current_page = containers.data('current_page');	if(current_page < numPages()-1) {pageSelected(current_page+1); return true;	} else { return false;}};}); /* When all initialisation is done, draw the links */ links = renderer.getLinks(current_page, pageSelected); containers.empty(); links.appendTo(containers);	/* call callback function */ opts.callback(current_page, containers);}})(jQuery);