jquery.pager.js分页实现详解

/* * jQuery pager plugin * Version 1.0 (12/22/2008) * @requires jQuery v1.2.6 or later * * Example at: http://jonpauldavies.github.com/JQuery/Pager/PagerDemo.html * * Copyright (c) 2008-2009 Jon Paul Davies * Dual licensed under the MIT and GPL licenses: * http://www.opensource.org/licenses/mit-license.php * http://www.gnu.org/licenses/gpl.html * * Read the related blog post and contact the author at http://www.j-dee.com/2008/12/22/jquery-pager-plugin/ * * This version is far from perfect and doesn't manage it's own state, therefore contributions are more than welcome! * * Usage: .pager({ pagenumber: 1, pagecount: 15, buttonClickCallback: PagerClickTest }); * * Where pagenumber is the visible page number * pagecount is the total number of pages to display * buttonClickCallback is the method to fire when a pager button is clicked. * * buttonClickCallback signiture is PagerClickTest = function(pageclickednumber) * Where pageclickednumber is the number of the page clicked in the control. * * The included Pager.CSS file is a dependancy but can obviously tweaked to your wishes * Tested in IE6 IE7 Firefox & Safari. Any browser strangeness, please report. */ (function($) {   $.fn.pager = function(options) {   var opts = $.extend({}, $.fn.pager.defaults, options);   return this.each(function() {   // empty out the destination element and then render out the pager with the supplied options   $(this).empty().append(renderpager(parseInt(options.pagenumber), parseInt(options.pagecount), options.buttonClickCallback));     // specify correct cursor activity   $('.pages li').mouseover(function() { document.body.style.cursor = "pointer"; }).mouseout(function() { document.body.style.cursor = "auto"; });  });  };   // render and return the pager with the supplied options  function renderpager(pagenumber, pagecount, buttonClickCallback) {   // setup $pager to hold render  var $pager = $('<ul class="pages"></ul>');   // add in the previous and next buttons  $pager.append(renderButton('第一页', pagenumber, pagecount, buttonClickCallback)).append(renderButton('上一页', pagenumber, pagecount, buttonClickCallback));   // pager currently only handles 5 viewable pages ( could be easily parameterized, maybe in next version ) so handle edge cases  var startPoint = 1;  var endPoint = 5;   if (pagenumber > 2) {   startPoint = pagenumber - 2;   endPoint = pagenumber + 2;  }   if (endPoint > pagecount) {   startPoint = pagecount - 3;   endPoint = pagecount;  }   if (startPoint < 1) {   startPoint = 1;  }   // loop thru visible pages and render buttons  for (var page = startPoint; page <= endPoint; page++) {    var currentButton = $('<li class="page-number">' + (page) + '</li>');    page == pagenumber ? currentButton.addClass('pgCurrent') : currentButton.click(function() { buttonClickCallback(this.firstChild.data); });   currentButton.appendTo($pager);  }   // render in the next and last buttons before returning the whole rendered control back.  $pager.append(renderButton('下一页', pagenumber, pagecount, buttonClickCallback)).append(renderButton('尾页', pagenumber, pagecount, buttonClickCallback));   return $pager;  }   // renders and returns a 'specialized' button, ie 'next', 'previous' etc. rather than a page number button  function renderButton(buttonLabel, pagenumber, pagecount, buttonClickCallback) {   var $Button = $('<li class="pgNext">' + buttonLabel + '</li>');   var destPage = 1;   // work out destination page for required button type  switch (buttonLabel) {   case "第一页":   destPage = 1;   break;   case "上一页":   destPage = pagenumber - 1;   break;   case "下一页":   destPage = pagenumber + 1;   break;   case "尾页":   destPage = pagecount;   break;  }   // disable and 'grey' out buttons if not needed.  if (buttonLabel == "第一页" || buttonLabel == "上一页") {   pagenumber <= 1 ? $Button.addClass('pgEmpty') : $Button.click(function() { buttonClickCallback(destPage); });  }  else {   pagenumber >= pagecount ? $Button.addClass('pgEmpty') : $Button.click(function() { buttonClickCallback(destPage); });  }   return $Button;  }   // pager defaults. hardly worth bothering with in this case but used as placeholder for expansion in the next version  $.fn.pager.defaults = {  pagenumber: 1,  pagecount: 1  };  })(jQuery); 

#pager ul.pages { display:block; border:none; text-transform:uppercase; font-size:10px; margin:10px 0 50px; padding:0; }  #pager ul.pages li { list-style:none; float:left; border:1px solid #ccc; text-decoration:none; margin:0 5px 0 0; padding:5px; }  #pager ul.pages li:hover { border:1px solid #003f7e; }  #pager ul.pages li.pgEmpty { border:1px solid #eee; color:#eee; }  #pager ul.pages li.pgCurrent { border:1px solid #003f7e; color:#000; font-weight:700; background-color:#eee; } 

 <html xmlns="http://www.w3.org/1999/xhtml"> <head>  <title>jQuery.pager.js Test</title>  <link href="Pager.css" rel="stylesheet" type="text/css" />  <script src="jquery-1.2.6.js" type="text/javascript"></script>  <script src="jquery.pager.js" type="text/javascript"></script>  <script type="text/javascript" language="javascript">   $(document).ready(function() {   $("#pager").pager({ pagenumber: 1, pagecount: 15, buttonClickCallback: PageClick });  });   PageClick = function(pageclickednumber) {   $("#pager").pager({ pagenumber: pageclickednumber, pagecount: 15, buttonClickCallback: PageClick });   $("#result").html("Clicked Page " + pageclickednumber);  }    </script> </head> <body> <h1 id="result">Click the pager below.</h1> <div id="pager" ></div> </body> </html>