自创的TreeTable控件

1、功能实现的关键点 
     1）TR元素的id、pid值的命名规则：以TR_开头，将每一层数据集中记录的索引加在前缀的后面，各层索引之间用下划线(_)隔开，比如TR_0_0_3。 
     2）控制数据行显示/隐藏的JavaScript代码。

2、显示数据行的Freemarker模板

<#macro showSub pId trID _level>
    <#-- 如果父ID为空，则取顶层的记录 -->
	<#if pId?has_content>
		<#local subList = serviceHelper.findSubOrganizations(pId) >
	<#else>
		<#assign subList = serviceHelper.findTopOrganizations() >
	</#if>
	
	<#list subList as item>
		<#local subList2 = serviceHelper.findSubOrganizations(item.orgId)>
		<#-- 行编号 -->
		<#if trID?has_content>
			<#local subId = "${trID}_${item_index?string('####')}">
		<#else>
			<#local subId = "${item_index?string('####')}">
		</#if>
		<tr id="TR_${subId}" <#if trID?has_content> pid="TR_${trID}" </#if> class="<#if rowIndex%2 == 0>bg1<#else>bg1</#if>" ondblclick="showDetails('orgView.action?orgId=${item.orgId}')" style="display:<#if _level?number-1 gt expandDepth>none</#if>">
			<td style="text-align:left;text-indent:${(_level?number - 1)*20}pt;">
				<#-- 有下级节点才显示加/减号的图片 -->
				<#if subList2?has_content>
					<#if _level?number gt expandDepth>
						<img src="images/dtree/nolines_plus.gif" id="IMG_${subId}" border="0" onclick="javascript:showHiddenNode(this, 'TR_${subId}')" style="cursor:hand;" align="absmiddle">
					<#else>
						<img src="images/dtree/nolines_minus.gif" id="IMG_${subId}" border="0" onclick="javascript:showHiddenNode(this, 'TR_${subId}')" style="cursor:hand;" align="absmiddle">
					</#if>
				</#if>
				<a href="#" oncontextmenu="showContextMenu('orgContextMenu', '${item.orgId}')">${item.name?if_exists?html}&nbsp;</a></td>
			<td>${item.shortName?if_exists?html}&nbsp;</td>
			<td>${item.contactor?if_exists?html}&nbsp;</td>
			<td>${item.telephone?if_exists?html}&nbsp;</td>
			<td>${item.fax?if_exists?html}&nbsp;</td>
		</tr>
	    <#assign rowIndex = rowIndex + 1>
		<@showSub item.orgId "${subId}" "${_level?number+1}"/>
	</#list>
</#macro>

<#assign rowIndex = 0>
<#assign expandDepth = 1> <#-- 默认展开的层数，层数大于该值时将被隐藏 -->
<table border="0" cellspacing="0" cellpadding="0" class="width100">
  	<tr>
    	<td style="padding-top:0px;">
    		
			<table border="0" cellspacing="0" cellpadding="2" class="list" width="100%">
				<tr class="top" height="25">
			    	<td nowrap>组织名称</td>
			    	<td width="70">简称</td>
			    	<td width="70">联系人</td>
			    	<td width="100">联系电话</td>
			    	<td width="100">传真</td>
			  	</tr>
			  	
			  	<@showSub "" "" "1" />
			</table>

		</td>
  	</tr>
</table>

3、获取数据的DAO方法

public List findSubOrganizations(String parentOrgId) {
    return find("from Organization where parentOrgId='" + parentOrgId + "'");
}

public List findTopOrganizations() {
    return find("from Organization where parentOrgId is null or parentOrgId=''");
}

4、控制数据行显示/隐藏的JavaScript代码

//显示或隐藏树形Table的子节点数据
function showHiddenNode(imgObj,trId){
	var imgSrc = imgObj.src.toLowerCase();
	if(imgSrc.indexOf("nolines_minus.gif") != -1){ //隐藏
		imgObj.src = "images/dtree/nolines_plus.gif";
  		jQuery("tr[id^=" + trId + "_]").css("display", "none");		
	}else{ //显示
		imgObj.src = "images/dtree/nolines_minus.gif";
		
		//显示第一层的子节点
		var trs = jQuery("tr[pid=" + trId + "]");
		trs.css("display", "");
		
		//显示更深层的子节点
		for(var i=0;i<trs.length;i++){
			showHiddenSub(trs[i].id);
		}
	}
}

//递归检查下一级节点是否需要显示
function showHiddenSub(trId){
	var imgObj = document.getElementById("IMG_" + trId.replace("TR_",""));
	if(imgObj == null) return;
	
	var imgSrc = imgObj.src.toLowerCase();
	if(imgSrc.indexOf("nolines_minus.gif") != -1){//下级节点是展开的，则需要显示出来
		var trs = jQuery("tr[pid=" + trId + "]");
		trs.css("display", "");
		
		for(var i=0;i<trs.length;i++){
			showHiddenSub(trs[i].id);
		}
	}
}

5、显示效果如图一所示

6、演示程序
看附件