Pajinate editado para usar anclajes de links

;(function($){
/*******************************************************************************************/
// jquery.pajinate.js - version 0.4
// A jQuery plugin for paginating through any number of DOM elements
//
// Copyright (c) 2010, Wes Nolte (http://wesnolte.com)
// Licensed under the MIT License (MIT-LICENSE.txt)
// http://www.opensource.org/licenses/mit-license.php
// Created: 2010-04-16 | Updated: 2010-04-26
//
/*******************************************************************************************/

    $.fn.pajinate = function(options){
        // Set some state information
        var current_page = 'current_page';
        var items_per_page = 'items_per_page';

        var meta;

        // Setup default option values
        var defaults = {
            item_container_id : '.content',
            items_per_page : 10,
            nav_panel_id : '.page_navigation',
            nav_info_id : '.info_text',
            num_page_links_to_display : 20,
            start_page : 0,
            wrap_around : false,
            nav_label_first : 'First',
            nav_label_prev : 'Prev',
            nav_label_next : 'Next',
            nav_label_last : 'Last',
            nav_order : ["first", "prev", "num", "next", "last"],
            nav_label_info : 'Showing {0}-{1} of {2} results',
            show_first_last: true,
            abort_on_small_lists: false,
            jquery_ui: false,
            jquery_ui_active: "ui-state-highlight",
            jquery_ui_default: "ui-state-default",
            jquery_ui_disabled: "ui-state-disabled"
        };
        var options = $.extend(defaults,options);
        var $item_container;
        var $page_container;
        var $items;
        var $nav_panels;
        var total_page_no_links;
        var jquery_ui_default_class = options.jquery_ui ? options.jquery_ui_default : '';
        var jquery_ui_active_class = options.jquery_ui ? options.jquery_ui_active : '';
        var jquery_ui_disabled_class = options.jquery_ui ? options.jquery_ui_disabled : '';

        return this.each(function(){
            $page_container = $(this);
            $item_container = $(this).find(options.item_container_id);
            $items = $page_container.find(options.item_container_id).children();

            if (options.abort_on_small_lists && options.items_per_page >= $items.size())
                return $page_container;

            meta = $page_container;

            // Initialize meta data
            meta.data(current_page,0);
            meta.data(items_per_page, options.items_per_page);

            // Get the total number of items
            var total_items = $item_container.children().size();

            // Calculate the number of pages needed
            var number_of_pages = Math.ceil(total_items/options.items_per_page);

            // Construct the nav bar
            var more = '<span class="ellipse more">...</span>';
            var less = '<span class="ellipse less">...</span>';
            var first = !options.show_first_last ? '' : '<a class="first_link '+ jquery_ui_default_class +'" href="">'+ options.nav_label_first +'</a>';
            var last = !options.show_first_last ? '' : '<a class="last_link '+ jquery_ui_default_class +'" href="">'+ options.nav_label_last +'</a>';

            var navigation_html = "";

            for(var i = 0; i < options.nav_order.length; i++) {
                switch (options.nav_order[i]) {
                case "first":
                    navigation_html += first;
                    break;
                case "last":
                    navigation_html += last;
                    break;
                case "next":
                    navigation_html += '<a class="next_link '+ jquery_ui_default_class +'" href="">'+ options.nav_label_next +'</a>';
                    break;
                case "prev":
                    navigation_html += '<a class="previous_link '+ jquery_ui_default_class +'" href="">'+ options.nav_label_prev +'</a>';
                    break;
                case "num":
                    navigation_html += less;
                    var current_link = 0;
                    while(number_of_pages > current_link){
                        navigation_html += '<a class="page_link '+ jquery_ui_default_class +'" href="" longdesc="' + current_link +'">'+ (current_link + 1) +'</a>';
                        current_link++;
                    }
                    navigation_html += more;
                    break;
                default:
                    break;
                }

            }

            // And add it to the appropriate area of the DOM
            $nav_panels = $page_container.find(options.nav_panel_id);
            $nav_panels.html(navigation_html).each(function(){

                $(this).find('.page_link:first').addClass('first');
                $(this).find('.page_link:last').addClass('last');

            });

            // Hide the more/less indicators
            $nav_panels.children('.ellipse').hide();

            // Set the active page link styling
            $nav_panels.find('.previous_link').next().next().addClass('active_page '+ jquery_ui_active_class);

            /* Setup Page Display */
            // And hide all pages
            $items.hide();
            // Show the first page
            $items.slice(0, meta.data(items_per_page)).show();

            /* Setup Nav Menu Display */
            // Page number slices

            total_page_no_links = $page_container.children(options.nav_panel_id+':first').children('.page_link').size();
            options.num_page_links_to_display = Math.min(options.num_page_links_to_display,total_page_no_links);

            $nav_panels.children('.page_link').hide(); // Hide all the page links

            // And only show the number we should be seeing
            $nav_panels.each(function(){
                $(this).children('.page_link').slice(0, options.num_page_links_to_display).show();
            });

            /* Bind the actions to their respective links */

            // Event handler for 'First' link
            $page_container.find('.first_link').click(function(e){
                e.preventDefault();

                movePageNumbersRight($(this),0);
                gotopage(0);
                window.location.hash = '#anclaje';
            });

            // Event handler for 'Last' link
            $page_container.find('.last_link').click(function(e){
                e.preventDefault();
                var lastPage = total_page_no_links - 1;
                movePageNumbersLeft($(this),lastPage);
                gotopage(lastPage);
                window.location.hash = '#anclaje';
            });

            // Event handler for 'Prev' link
            $page_container.find('.previous_link').click(function(e){
                e.preventDefault();
                showPrevPage($(this));
                window.location.hash = '#anclaje';
            });


            // Event handler for 'Next' link
            $page_container.find('.next_link').click(function(e){
                e.preventDefault();
                showNextPage($(this));
                window.location.hash = '#anclaje';
            });

            // Event handler for each 'Page' link
            $page_container.find('.page_link').click(function(e){
                e.preventDefault();
                gotopage($(this).attr('longdesc'));
                window.location.hash = '#anclaje';
            });

            // Goto the required page
            gotopage(parseInt(options.start_page));
            toggleMoreLess();
            if(!options.wrap_around)
                tagNextPrev();
        });

        function showPrevPage(e){
            new_page = parseInt(meta.data(current_page)) - 1;

            // Check that we aren't on a boundary link
            if($(e).siblings('.active_page').prev('.page_link').length==true){
                movePageNumbersRight(e,new_page);
                gotopage(new_page);
            }else if(options.wrap_around){
                gotopage(total_page_no_links-1);
            }


        };

        function showNextPage(e){
            new_page = parseInt(meta.data(current_page)) + 1;

            // Check that we aren't on a boundary link
            if($(e).siblings('.active_page').next('.page_link').length==true){
                movePageNumbersLeft(e,new_page);
                gotopage(new_page);
            } else if (options.wrap_around) {
                gotopage(0);
            }


        };

        function gotopage(page_num){

            var ipp = parseInt(meta.data(items_per_page));

            var isLastPage = false;

            // Find the start of the next slice
            start_from = page_num * ipp;

            // Find the end of the next slice
            end_on = start_from + ipp;
            // Hide the current page
            var items = $items.hide().slice(start_from, end_on);

            items.show();

            // Reassign the active class
            $page_container.find(options.nav_panel_id).children('.page_link[longdesc=' + page_num +']').addClass('active_page '+ jquery_ui_active_class)
                                                     .siblings('.active_page')
                                                     .removeClass('active_page ' + jquery_ui_active_class);

            // Set the current page meta data
            meta.data(current_page,page_num);

            $page_container.find(options.nav_info_id).html(options.nav_label_info.replace("{0}",start_from+1).
                    replace("{1}",start_from + items.length).replace("{2}",$items.length));

            // Hide the more and/or less indicators
            toggleMoreLess();

            // Add a class to the next or prev links if there are no more pages next or previous to the active page
            tagNextPrev();

        };

        // Methods to shift the diplayed index of page numbers to the left or right
        function movePageNumbersLeft(e, new_p){
            var new_page = new_p;

            var $current_active_link = $(e).siblings('.active_page');

            if($current_active_link.siblings('.page_link[longdesc=' + new_page +']').css('display') == 'none'){

                $nav_panels.each(function(){
                            $(this).children('.page_link')
                                .hide() // Hide all the page links
                                .slice(parseInt(new_page - options.num_page_links_to_display + 1) , new_page + 1)
                                .show();
                            });
            }


        }

        function movePageNumbersRight(e, new_p){
            var new_page = new_p;

            var $current_active_link = $(e).siblings('.active_page');

            if($current_active_link.siblings('.page_link[longdesc=' + new_page +']').css('display') == 'none'){

                $nav_panels.each(function(){
                            $(this).children('.page_link')
                                .hide() // Hide all the page links
                                .slice( new_page , new_page + parseInt(options.num_page_links_to_display))
                                .show();
                            });
            }

        }

        // Show or remove the ellipses that indicate that more page numbers exist in the page index than are currently shown
        function toggleMoreLess(){

            if(!$nav_panels.children('.page_link:visible').hasClass('last')){
                $nav_panels.children('.more').show();
            }else {
                $nav_panels.children('.more').hide();
            }

            if(!$nav_panels.children('.page_link:visible').hasClass('first')){
                $nav_panels.children('.less').show();
            }else {
                $nav_panels.children('.less').hide();
            }
        }

        /* Add the style class ".no_more" to the first/prev and last/next links to allow custom styling */
        function tagNextPrev() {
            if($nav_panels.children('.last').hasClass('active_page')){
                $nav_panels.children('.next_link').add('.last_link').addClass('no_more ' + jquery_ui_disabled_class);
            } else {
                $nav_panels.children('.next_link').add('.last_link').removeClass('no_more ' + jquery_ui_disabled_class);
            }

            if($nav_panels.children('.first').hasClass('active_page')){
                $nav_panels.children('.previous_link').add('.first_link').addClass('no_more ' + jquery_ui_disabled_class);
            } else {
                $nav_panels.children('.previous_link').add('.first_link').removeClass('no_more ' + jquery_ui_disabled_class);
            }
        }

    };

})(jQuery);