緊接著上篇—分頁技術原理與實現之Java+Oracle代碼實現分頁(二) ，本篇繼續分析分頁技術。上篇講的是分頁技術的代碼實現，這篇繼續分析一下分頁技術的效果控制。
上篇已經用代碼簡單的實現了一個分頁。但是我們都看到，代碼中每次通過servlet請求取得結果集後，都會轉向到一個jsp頁面顯示結果，這樣每次查詢頁面都會重新整理一下，比如查詢出現結果集後要查看第三頁，頁面就會重新整理一下。這樣頁面給人的效果感覺就會有點不舒服，所以我們希望能夠在通過條件查詢結果集後無論訪問哪一頁，頁面都不會重新整理，而只是結果集變化。要解決這個，我想大家很容易就會想到Ajax了。
是啊，這就要請Ajax出山了。當通過查詢條件查詢到結果集後，以後每次訪問任何一頁都通過Ajax來訪問，使用非同步Ajax與Servlet進行互動，將結果查詢出來返回給Ajax，這樣頁面內容因為Ajax返回結果而改變，而頁面卻不會重新整理，這就實現了無重新整理的分頁技術。
下面我們來看一個簡單的無重新整理分頁實現，代碼如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" href="../lib/jquery_pagination/pagination.css" mce_href="lib/jquery_pagination/pagination.css" /> <mce:script type="text/<a href="http://lib.csdn.net/base/javascript" class='replace_word' title="JavaScript知識庫" target='_blank' style='color:#df3434; font-weight:bold;'>JavaScript</a>" src="../lib/<a href="http://lib.csdn.net/base/jquery" class='replace_word' title="jQuery知識庫" target='_blank' style='color:#df3434; font-weight:bold;'>jQuery</a>/jquery.min.js" mce_src="lib/jquery/jquery.min.js"></mce:script> <mce:script type="text/javascript" src="../lib/jquery_pagination/jquery.pagination.js"></mce:script> <mce:script type="text/javascript"><!-- /** * Callback function that displays the content. * * Gets called every time the user clicks on a pagination link. * * @param {int}page_index New Page index * @param {jQuery} jq the <a href="http://lib.csdn.net/base/docker" class='replace_word' title="Docker知識庫" target='_blank' style='color:#df3434; font-weight:bold;'>Container</a> with the pagination links as a jQuery object */ function pageselectCallback(page_index, jq) { var new_content = $('#hiddenresult div.result:eq(' + page_index + ')') .clone(); $('#Searchresult').empty().append(new_content); return false; } function initPagination() { var num_entries = $('#hiddenresult div.result').length; // Create pagination element $("#Pagination").pagination(num_entries, { num_edge_entries : 2, num_display_entries : 8, callback : pageselectCallback, items_per_page : 1 }); } // When the HTML has loaded, call initPagination to paginate the elements $(document).ready(function() { initPagination(); });// --></mce:script> <mce:style type="text/css"><!--* { padding: 0; margin: 0;}body { background-color: #fff; margin: 20px; padding: 0; height: 100%; font-family: Arial, Helvetica, sans-serif;}#Searchresult { margin-top: 15px; margin-bottom: 15px; border: solid 1px #eef; padding: 5px; background: #eef; width: 40%;}#Searchresult p { margin-bottom: 1.4em;}--></mce:style><style type="text/css" mce_bogus="1">* { padding: 0; margin: 0;}body { background-color: #fff; margin: 20px; padding: 0; height: 100%; font-family: Arial, Helvetica, sans-serif;}#Searchresult { margin-top: 15px; margin-bottom: 15px; border: solid 1px #eef; padding: 5px; background: #eef; width: 40%;}#Searchresult p { margin-bottom: 1.4em;}</style> <title>Pagination</title> </head> <body> <h4> jQuery Pagination Plugin Demo </h4> <div id="Pagination" class="pagination"> </div> <br style="clear: both;" mce_style="clear: both;" /> <div id="Searchresult"> This content will be replaced when pagination inits. </div> <div id="hiddenresult" style="display: none;" mce_style="display: none;"> <div class="result"> <p> Globally maximize granular "outside the box" thinking vis-a-vis quality niches. Proactively formulate 24/7 results whereas 2.0 catalysts for change. Professionally implement 24/365 niches rather than client-focused users. </p> <p> Competently engineer high-payoff "outside the box" thinking through cross functional benefits. Proactively transition intermandated processes through open-source niches. Progressively engage maintainable innovation and extensible interfaces. </p> </div> <div class="result"> <p> Credibly fabricate e-business models for end-to-end niches. Compellingly disseminate integrated e-markets without ubiquitous services. Credibly create equity invested channels with multidisciplinary human capital. </p> <p> Interactively integrate competitive users rather than fully tested infomediaries. Seamlessly initiate premium functionalities rather than impactful architectures. Rapidiously leverage existing resource-leveling processes via user-centric portals. </p> </div> <div class="result"> <p> Monotonectally initiate unique e-services vis-a-vis client-centric deliverables. Quickly impact parallel opportunities with B2B bandwidth. Synergistically streamline client-focused infrastructures rather than B2C e-commerce. </p> <p> Phosfluorescently fabricate 24/365 e-business through 24/365 total linkage. Completely facilitate high-quality systems without stand-alone strategic theme areas. </p> </div> </div> </body></html>
這就是一個非常簡單的無重新整理分頁實現，使用了JQuery+ jquery.pagination架構。現在隨著架構的流行，尤其是Jquery的流行，使用架構來開發是非常有效。上面代碼原理在代碼中已有注釋，也可參考Jquery的官方網站：。
現在就可以來開發我們的Ajax無重新整理分頁實現。基於上面的原理，在響應頁碼被按下的代碼中pageselectCallback()，我們使用一個Ajax非同步訪問資料庫，通過點擊的頁號將結果集取出後再用非同步設定到頁面，這樣就可以完成了無重新整理實現。
頁碼被按下的響應函數pageselectCallback()修改如下：
這樣就可以用非同步方式擷取結果，用showResponse函數來處理結果了，showResponse函數如下：
function showResponse(request){ var content = request; var root = content.documentElement; var responseNodes = root.getElementsByTagName("root"); var itemList = new Array(); var pageList=new Array(); alert(responseNodes.length); if (responseNodes.length > 0) { var responseNode = responseNodes[0]; var itemNodes = responseNode.getElementsByTagName("data"); for (var i=0; i<itemNodes.length; i++) { var idNodes = itemNodes[i].getElementsByTagName("id"); var nameNodes = itemNodes[i].getElementsByTagName("name"); var sexNodes=itemNodes[i].getElementsByTagName("sex"); var ageNodes=itemNodes[i].getElementsByTagName("age"); if (idNodes.length > 0 && nameNodes.length > 0&&sexNodes.length > 0&& ageNodes.length > 0) { var id=idNodes[0].firstChild.nodeValue; var name = nameNodes[0].firstChild.nodeValue; var sex = sexNodes[0].firstChild.nodeValue; var age=ageNodes[0].firstChild.nodeValue; itemList.push(new Array(id,name, sex,age)); } } var pageNodes = responseNode.getElementsByTagName("pagination"); if (pageNodes.length>0) { var totalNodes = pageNodes[0].getElementsByTagName("total"); var startNodes = pageNodes[0].getElementsByTagName("start"); var endNodes=pageNodes[0].getElementsByTagName("end"); var currentNodes=pageNodes[0].getElementsByTagName("pageno"); if (totalNodes.length > 0 && startNodes.length > 0&&endNodes.length > 0) { var total=totalNodes[0].firstChild.nodeValue; var start = startNodes[0].firstChild.nodeValue; var end = endNodes[0].firstChild.nodeValue; var current=currentNodes[0].firstChild.nodeValue; pageList.push(new Array(total,start,end,current)); } } } showTable(itemList,pageList); }
如上代碼就是用來處理通過Ajax非同步請求Servlet後返回的XML格式的結果，其中Servlet代碼在上篇中。其中itemList、pageList分別是解析返回後產生的使用者List和分頁導航，這樣使用者就可以以自己的展現方式展現資料了。
function pageselectCallback(page_index, jq){ var pars="pageNo="+(page_index+1); $.ajax({ type: "POST", url: " UserBasicSearchServlet", cache: false, data: pars, success: showResponse }); return false;}
以上就是本文的全部內容，希望對大家的學習有所協助，也希望大家多多支援雲棲社區。
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