<!DOCTYPE html>
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<HTML>
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<HEAD>
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<TITLE> ZTREE DEMO - big data async</TITLE>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link rel="stylesheet" href="../../../css/demo.css" type="text/css">
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<link rel="stylesheet" href="../../../css/zTreeStyle/zTreeStyle.css" type="text/css">
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<script type="text/javascript" src="../../../js/jquery-1.4.4.min.js"></script>
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<script type="text/javascript" src="../../../js/jquery.ztree.core.js"></script>
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<script type="text/javascript" src="../../../js/jquery.ztree.excheck.js"></script>
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<script type="text/javascript" src="../../../js/jquery.ztree.exedit.js"></script>
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<SCRIPT type="text/javascript">
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<!--
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var setting = {
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async: {
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enable: true,
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url: getUrl
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},
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check: {
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enable: true
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},
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data: {
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simpleData: {
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enable: true
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}
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},
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view: {
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expandSpeed: ""
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},
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callback: {
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beforeExpand: beforeExpand,
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onAsyncSuccess: onAsyncSuccess,
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onAsyncError: onAsyncError
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}
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};
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var zNodes =[
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{name:"500个节点", id:"1", count:500, times:1, isParent:true},
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{name:"1000个节点", id:"2", count:1000, times:1, isParent:true},
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{name:"2000个节点", id:"3", count:2000, times:1, isParent:true}
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];
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var log, className = "dark",
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startTime = 0, endTime = 0, perCount = 100, perTime = 100;
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function getUrl(treeId, treeNode) {
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var curCount = (treeNode.children) ? treeNode.children.length : 0;
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var getCount = (curCount + perCount) > treeNode.count ? (treeNode.count - curCount) : perCount;
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var param = "id="+treeNode.id+"_"+(treeNode.times++) +"&count="+getCount;
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return "../asyncData/getNodesForBigData.php?" + param;
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}
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function beforeExpand(treeId, treeNode) {
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if (!treeNode.isAjaxing) {
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startTime = new Date();
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treeNode.times = 1;
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ajaxGetNodes(treeNode, "refresh");
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return true;
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} else {
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alert("zTree 正在下载数据中，请稍后展开节点。。。");
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return false;
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}
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}
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function onAsyncSuccess(event, treeId, treeNode, msg) {
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if (!msg || msg.length == 0) {
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return;
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}
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var zTree = $.fn.zTree.getZTreeObj("treeDemo"),
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totalCount = treeNode.count;
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if (treeNode.children.length < totalCount) {
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setTimeout(function() {ajaxGetNodes(treeNode);}, perTime);
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} else {
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treeNode.icon = "";
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zTree.updateNode(treeNode);
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zTree.selectNode(treeNode.children[0]);
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endTime = new Date();
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var usedTime = (endTime.getTime() - startTime.getTime())/1000;
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className = (className === "dark" ? "":"dark");
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showLog("[ "+getTime()+" ] treeNode:" + treeNode.name );
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showLog("加载完毕，共进行 "+ (treeNode.times-1) +" 次异步加载, 耗时："+ usedTime + " 秒");
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}
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}
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function onAsyncError(event, treeId, treeNode, XMLHttpRequest, textStatus, errorThrown) {
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var zTree = $.fn.zTree.getZTreeObj("treeDemo");
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alert("异步获取数据出现异常。");
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treeNode.icon = "";
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zTree.updateNode(treeNode);
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}
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function ajaxGetNodes(treeNode, reloadType) {
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var zTree = $.fn.zTree.getZTreeObj("treeDemo");
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if (reloadType == "refresh") {
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treeNode.icon = "../../../css/zTreeStyle/img/loading.gif";
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zTree.updateNode(treeNode);
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}
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zTree.reAsyncChildNodes(treeNode, reloadType, true);
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}
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function showLog(str) {
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if (!log) log = $("#log");
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log.append("<li class='"+className+"'>"+str+"</li>");
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if(log.children("li").length > 4) {
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log.get(0).removeChild(log.children("li")[0]);
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}
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}
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function getTime() {
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var now= new Date(),
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h=now.getHours(),
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m=now.getMinutes(),
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s=now.getSeconds(),
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ms=now.getMilliseconds();
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return (h+":"+m+":"+s+ " " +ms);
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}
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$(document).ready(function(){
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$.fn.zTree.init($("#treeDemo"), setting, zNodes);
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});
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//-->
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</SCRIPT>
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</HEAD>
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<BODY>
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<h1>分批异步加载大数据量</h1>
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<h6>[ 文件路径: bigdata/diy_async.html ]</h6>
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<div class="content_wrap">
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<div class="zTreeDemoBackground left">
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<ul>
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<li class="highlight_red"> 此 Demo 专门用于测试分批异步加载，每次展开节点都要重新进行异步加载。</li>
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</ul>
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<ul id="treeDemo" class="ztree"></ul>
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</div>
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<div class="right">
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<ul class="info">
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<li class="title"><h2>1、大数据量加载说明</h2>
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<ul class="list">
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<li>1)、对于某一级节点数多达几千个的时候，zTree 默认的延迟加载是无效的，此 Demo 演示了一种原先 zTree v2.6 时的分批加载节点的方法。</li>
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<li class="highlight_red">2)、此方法适用于1、2千个节点必须全部显示的需求。</li>
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<li class="highlight_red">3)、此方法并不能解决加载慢的问题，相反只会让最终结果出现的更慢，只是可以有限度的避免浏览器假死，而且显示的节点越多就越慢。</li>
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<li>4)、对于某一级节点数至少几千个的情况，另一个解决方案是：分页异步加载。<br/>
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async load log:<br/>
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<ul id="log" class="log" style="height:85px"></ul></li>
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</ul>
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</li>
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<li class="title"><h2>2、setting 配置信息说明</h2>
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<ul class="list">
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<li>需要设置 setting.async 异步加载部分的参数</li>
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<li>建议关闭动画效果 setting.view.expandSpeed = "";</li>
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<li>其他不需要进行特殊的配置，根据自己的需求自行设置</li>
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</ul>
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</li>
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<li class="title"><h2>3、treeNode 节点数据说明</h2>
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<ul class="list">
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<li>对 节点数据 没有特殊要求，用户可以根据自己的需求添加自定义属性</li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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</BODY>
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</HTML>
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