/*
paginateTable 1.1
Copyright 2010-2011,  Matthew Page
licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php

Thanks to Greg Pedder for the page number feature.
*/
(function ($) {

  $.fn.paginateTable = function(options) {
  
      var settings = jQuery.extend({
          rowsPerPage: 5,               /* the number of rows that comprise a page */
          nextPage: ".nextPage", 		/* selector for "Next Page" dom element. Click to change page. */
          prevPage: ".prevPage",		/* selector for "Previous Page" dom element. Click to change page. */ 
          currentPage: ".currentPage",	/* selector for "Current Page" dom element. Display only. */
          totalPages: ".totalPages",	/* selector for "Total Pages" dom element. Display only. */
          pageNumbers: ".pageNumbers",  /* selector for container for autogenerated page number links */
          pager: ".pager",		        /* selector for container of all paging dom elements */
          autoHidePager: true		    /* hides the pager (see selector above) if there is only a single page */
      }, options || {});
  
      return this.each(function(){
          
          var table = $(this);
          var pager = $(settings.pager);
          var nextPage = pager.find(settings.nextPage);
          var prevPage = pager.find(settings.prevPage);
          var currentPage = pager.find(settings.currentPage);
          
          nextPage.click(function(){
                  var pageNum = getCurrentPage(currentPage.text());
                  displayPage(table, pageNum+1, settings);
                  return false;
              });
          
          prevPage.click(function(){
                  var pageNum = getCurrentPage(currentPage.text());
                  displayPage(table, pageNum-1, settings);
                  return false;
              });
          
          displayPage(table, getCurrentPage(currentPage.text()), settings);
      });
  };
  
  function getCurrentPage(pageText){
      var pageNum = parseInt(pageText,10);
      if (isNaN(pageNum)){
          pageNum = 0;
      }
      return Math.max(1, pageNum);
  }

  function displayPage(table, pageNum, settings){
      pageNum = Math.max(1, pageNum);
      if (settings.rowsPerPage > 0){
          var rows = table.find("tbody tr");
          var totalPages = Math.ceil(rows.size() / settings.rowsPerPage);
          if (settings.autoHidePager && totalPages <= 1){
              $(settings.pager).hide();
          }
          else if (totalPages > 0){
              
              pageNum = Math.min(pageNum, totalPages);
              var rowStartIndex = (pageNum - 1) * settings.rowsPerPage;
              var rowEndIndex = pageNum * settings.rowsPerPage;
              $.each(rows, function(index, row){
                  if (index >= rowStartIndex && index < rowEndIndex){
                      $(row).show();
                  }
                  else{
                      $(row).hide();
                  }
              });
              
              var pager = $(settings.pager);
              pager.find(settings.currentPage).text(pageNum);
              pager.find(settings.totalPages).text(totalPages);
              
              var pageNumbers = pager.find(settings.pageNumbers);
              if (pageNumbers.size() > 0){
                   pageNumbers.empty();
                   for(var i = 1; i <= totalPages; i++) {
                       pageNumbers.append("<a href='#' id='" + i + "'>" + i + "</a>");
                   }
       
                   pageNumbers.children('a').click(function(){
                       displayPage(table, $(this).attr("id"), settings);
                       return false;
                   });
              }
          }
          
      }
  }
	
})(jQuery);