springMVC+velocity实现仿Datatables局部刷新分页方法

因为项目中之前的模块用的分页插件是Datatables，很方便，但是新做的模块表格中的布局有变化，Datatables插件满足不了了。为了风格的统一，同时也不希望查询参数再传递回显在页面上，所以就采用局部刷新分页的实现方案。

实现方案是这样的，将表格部分提取出来，用来作为页面局部刷新的部分，文件名为list-data.vm

<table class="table text-center table_acolor">
<thead>
<tr>
 <th width="16％">userName</th>
 <th width="24％">age</th>
</tr>
</thead>
<tbody>
#foreach($data in $!{page.list})
<tr>
 <td width="16％">$!{data.userName}</td>
 <td width="24％">$!{data.sex}</td>
</tr>
#end
</tbody>
</table>
#pageNation($!{page})

其中的pageNation是定义的一个宏（macro），用来做底部的分页条和分页条的显示逻辑。page对象是ajax请求返回的分页数据。每一次ajax请求，查询出分页数据，将数据放入list-data.vm所对应的视图的ModelAndView对象，然后返回ModelAndView对象，将这一部分追加到主页面表格所在的部分。

macro部分如下：

#macro(pageNation $data)
#if(!$data.list.size() or $data.list.size() == 0)
<div class="row DTTTFooter no-padding" style="height:40px; line-height:40px; text-align:center; font-size:14px;">
未查询到记录
</div>
#end
#if($data.list.size() and $data.list.size() > 0)
 <div id="activityTable_info" class="dataTables_info" role="status" aria-live="polite">显示第 $!{data.startRow} 至 $!{data.endRow} 项结果，共 $!{data.total}项</div>
 <div id="pagination" class="dataTables_paginate paging_full_numbers">
 #set($prevPage = ${data.prePage})
 #set($nextnPage = ${data.nextPage})
 <a #if($data.pageNum ==1) class="paginate_button disabled" disabled="disabled" href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow"
 #else class="paginate_button" pageNum="1" href="javascript:goPage(1)" rel="external nofollow"
 #end style="margin-left: 2px;"
 >首页</a>
 <a #if($data.pageNum ==1) class="paginate_button disabled" disabled="disabled" href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow"
 #else class="paginate_button" pageNum="$prevPage" href="javascript:goPage($prevPage)" rel="external nofollow"
 #end style="margin-left: 2px;"
 > 上页 </a>
 #set($temp = ${data.pageNum} - 1)
 #set($numbers = $!{pageUtil.numbers($temp, $data.pages)})

#foreach($foo in $numbers)
 #if($foo == -999)
 <span>…</span>
 #else
 <a class="paginate_button #if($foo==${data.pageNum}) current #end" pageNum="$foo" #if($foo!=${data.pageNum}) href="javascript:goPage($foo)" rel="external nofollow" #end style="margin-left: 2px;"
 > $foo </a>
 #end
 #end

<a
 #if($data.pageNum == $data.pages) class="paginate_button disabled" disabled="disabled"
 #else class="paginate_button" pageNum="$nextnPage" href="javascript:goPage($nextnPage)" rel="external nofollow"
 #end style="margin-left: 2px;"
 > 下页
 <a
 #if($data.pageNum == $data.pages)
  class="paginate_button disabled" disabled="disabled" href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow"
 #else
  class="paginate_button" pageNum="$data.pages" href="javascript:goPage($data.pages)" rel="external nofollow"
 #end
 >末页</a>
 到第
<input id="changePage" class="margin text-center" type="text" maxpage="10" style="height:28px;line-height:28px;width:40px;">
页
<a id="dataTable-btn" class="btn btn-default shiny" href="javascript:jumpPage($data.pages);" rel="external nofollow" style="margin-bottom:5px">确认</a>
#end
</div>
<div p_sortinfo="$!{data.orderBy}" p_isFirst=$!{data.isFirst} p_isLast=$!{data.isLast} p_currentpagenum="$!{data.pageNum}" p_totalsize="$!{data.total}" p_endrow="$!{data.endRow}" p_totalpagesnum="$!{data.pages}" p_pagesize="$!{data.pageSize}" p_startrow="$!{data.startRow}" style="display:none" class="paginator"></div>
#end

pageUtil是写的velocity toolbox的一个工具类，用来仿Datatables分页条的分页页码显示的逻辑：

public class PageUtil {

public static LinkedList<Integer> range(Integer len,Integer start) {
LinkedList<Integer> out = new LinkedList<>();
Integer end;

if (start == null ) {
 start = 0;
 end = len;
}

else {
 end = start;
 start = len;
}

for (int i=start ; i<end ; i++ ) {
 out.add(i);
}

return out;
}

public static List<Integer> numbers (Integer page,Integer pages) {
LinkedList<Integer> numbers = new LinkedList<>();
Integer buttons = 7;
Integer half = buttons / 2;

if (pages <= buttons ) {
 numbers = range( 0, pages );
}
else if ( page <= half ) {
 numbers = range( 0, buttons-2 );
 numbers.add(-1000);
 numbers.add( pages-1 );
}
else if ( page >= pages - 1 - half ) {
 numbers = range( pages-(buttons-2), pages );
 numbers.addFirst(-1000 ); //向头放
 numbers.addFirst(0 );
}
else {
 numbers = range( page-1, page+2 );
 numbers.add( -1000 );
 numbers.add( pages-1 );
 numbers.addFirst(-1000 );
 numbers.addFirst(0 );
}
List<Integer> res = new ArrayList<>();
for (Integer integer : numbers) {
 res.add(integer+1);
}
return res;
}
}

而这段逻辑是从Datatables的js源码中找到的，我将其转化为java代码。Datatables源码的该部分代码如下

function _numbers ( page, pages ) {
var
 numbers = [],
 buttons = extPagination.numbers_length,
 half = Math.floor( buttons / 2 ),
 i = 1;

if ( pages <= buttons ) {
 numbers = _range( 0, pages );
}
else if ( page <= half ) {
 numbers = _range( 0, buttons-2 );
 numbers.push( 'ellipsis' );
 numbers.push( pages-1 );
}
else if ( page >= pages - 1 - half ) {
 numbers = _range( pages-(buttons-2), pages );
 numbers.splice( 0, 0, 'ellipsis' ); // no unshift in ie6
 numbers.splice( 0, 0, 0 );
}
else {
 numbers = _range( page-1, page+2 );
 numbers.push( 'ellipsis' );
 numbers.push( pages-1 );
 numbers.splice( 0, 0, 'ellipsis' );
 numbers.splice( 0, 0, 0 );
}

numbers.DT_el = 'span';
return numbers;
}

var _range = function ( len, start )
{
var out = [];
var end;

if ( start === undefined ) {
 start = 0;
 end = len;
}
else {
 end = start;
 start = len;
}

for ( var i=start ; i<end ; i++ ) {
 out.push( i );
}

return out;
};

我将页面的ajax请求分页的数据做了封装：

/**
*
*/
//macro分页跳页调用方法，调用的页面需要提供goPage(redirectpage)方法
function jumpPage(totalPage) {
var redirectpage = $("#changePage").val();
if(redirectpage == ""){
$("#changePage").focus();
}else{
var rex = /^\d+$/;
if(!rex.test(redirectpage)){
 alert("页码输入有误，只能输入不大于总页数的正整数");
}else{
 var pageNo = parseInt(redirectpage);
 if(pageNo <= 0 || pageNo > totalPage){
 alert("页码输入有误，只能输入不大于总页数的正整数");
 }else{
 goPage(redirectpage)
 }
}
}
}

$.fn.pagenation = function(options) {

//默认参数
var defaults={
 url:"",
 data:{},//参数
 pageNo:1,//页码
 pageSize:10,//页面大小
 pageSuccess:{}//分页数据成功返回的回调函数
}
var _self = $(this);
options = $.extend(defaults,options);
var ajaxData = {
"pageNo":options.pageNo,
"pageSize":options.pageSize
};

this.fnDraw = function(pageNo) {
if (typeof (options.data) == 'function') {
 ajaxData = options.data(ajaxData);
} else {
 ajaxData = $.extend(ajaxData,options.data);
}
if (pageNo != undefined) {
 ajaxData['pageNo'] = pageNo;
}

$.ajax({
 url: options.url,
 async: false,
 type:"post",
 data: ajaxData,
 success: function(result,code,dd) {
 _self.html(result);
 if (typeof options.pageSuccess == 'function') {
  options.pageSuccess();
 }
 },
 error:function(){
 alert("操作失败");
 }
});
};

this.init = function() {
this.fnDraw(1);
return this;
}

return this;

}

在主页面调用：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
#set($ctx = ${request.getContextPath()})
<link rel="stylesheet" type="text/css" href="$ctx/assets/js/dataTables/jquery.dataTables.min.css" rel="external nofollow" />
<link rel="stylesheet" type="text/css" href="$ctx/assets/js/dataTables/css/jquery.dataTables_theme.css" rel="external nofollow" />
<script type="text/javascript" src="$ctx/assets/js/jquery-1.11.2.min.js"></script>
<script type="text/javascript" src="$ctx/assets/js/macro.pagination.js"></script>
</head>
<body>
<div class="dataTables_wrapper" id="pageDiv">

</div>
<script type="text/javascript">
var pagenation = $("#pageDiv").pagenation({
url:"${ctx}/listData.do",
pageSize:20,
data:function (data) {
 $("#searchForm [name]").each(function(i, n){
 data[$(n).attr('name')] = n.value;
 });
 return data;
},
pageSuccess:function(){

}
}).init();

function goPage(pageNo) {
pagenation.fnDraw(pageNo);
}
</script>
</body>
</html>

其中pageSuccess参数是用来在ajax返回数据成功后，需要做的一些操作。

这里说的也不太明白，附上码云的git地址：http://git.oschina.net/ivwpw/pagenation

其中并没有做从数据库插数据的部分，只是在Controller中模拟了页面需要的数据。

来源：http://blog.csdn.net/kusedexingfu/article/details/67641080