<!DOCTYPE html>
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<HTML>
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<HEAD>
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<TITLE> ZTREE DEMO - big data common</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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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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callback: {
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onNodeCreated: onNodeCreated
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}
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};
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var dataMaker = function(count) {
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var nodes = [], pId = -1,
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min = 10, max = 90, level = 0, curLevel = [], prevLevel = [], levelCount,
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i = 0,j,k,l,m;
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while (i<count) {
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if (level == 0) {
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pId = -1;
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levelCount = Math.round(Math.random() * max) + min;
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for (j=0; j<levelCount && i<count; j++, i++) {
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var n = {id:i, pId:pId, name:"Big-" +i};
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nodes.push(n);
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curLevel.push(n);
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}
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} else {
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for (l=0, m=prevLevel.length; l<m && i<count; l++) {
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pId = prevLevel[l].id;
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levelCount = Math.round(Math.random() * max) + min;
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for (j=0; j<levelCount && i<count; j++, i++) {
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var n = {id:i, pId:pId, name:"Big-" +i};
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nodes.push(n);
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curLevel.push(n);
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}
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}
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}
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prevLevel = curLevel;
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curLevel = [];
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level++;
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}
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return nodes;
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}
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var ruler = {
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doc: null,
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ruler: null,
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cursor: null,
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minCount: 5000,
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count: 5000,
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stepCount:500,
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minWidth: 30,
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maxWidth: 215,
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init: function() {
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ruler.doc = $(document);
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ruler.ruler = $("#ruler");
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ruler.cursor = $("#cursor");
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if (ruler.ruler) {
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ruler.ruler.bind("mousedown", ruler.onMouseDown);
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}
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},
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onMouseDown: function(e) {
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ruler.drawRuler(e, true);
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ruler.doc.bind("mousemove", ruler.onMouseMove);
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ruler.doc.bind("mouseup", ruler.onMouseUp);
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ruler.doc.bind("selectstart", ruler.onSelect);
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$("body").css("cursor", "pointer");
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},
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onMouseMove: function(e) {
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ruler.drawRuler(e);
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return false;
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},
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onMouseUp: function(e) {
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$("body").css("cursor", "auto");
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ruler.doc.unbind("mousemove", ruler.onMouseMove);
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ruler.doc.unbind("mouseup", ruler.onMouseUp);
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ruler.doc.unbind("selectstart", ruler.onSelect);
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ruler.drawRuler(e);
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},
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onSelect: function (e) {
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return false;
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},
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getCount: function(end) {
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var start = ruler.ruler.offset().left+1;
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var c = Math.max((end - start), ruler.minWidth);
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c = Math.min(c, ruler.maxWidth);
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return {width:c, count:(c - ruler.minWidth)*ruler.stepCount + ruler.minCount};
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},
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drawRuler: function(e, animate) {
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var c = ruler.getCount(e.clientX);
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ruler.cursor.stop();
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if ($.browser.msie || !animate) {
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ruler.cursor.css({width:c.width});
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} else {
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ruler.cursor.animate({width:c.width}, {duration: "fast",easing: "swing", complete:null});
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}
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ruler.count = c.count;
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ruler.cursor.text(c.count);
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}
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}
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var showNodeCount = 0;
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function onNodeCreated(event, treeId, treeNode) {
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showNodeCount++;
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}
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function createTree () {
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var zNodes = dataMaker(ruler.count);
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showNodeCount = 0;
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$("#treeDemo").empty();
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setting.check.enable = $("#showChk").attr("checked");
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var time1 = new Date();
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$.fn.zTree.init($("#treeDemo"), setting, zNodes);
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var time2 = new Date();
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alert("节点共 " + zNodes.length + " 个, 初始化生成 DOM 的节点共 " + showNodeCount + " 个"
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+ "\n\n 初始化 zTree 共耗时: " + (time2.getTime() - time1.getTime()) + " ms");
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}
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$(document).ready(function(){
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ruler.init("ruler");
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$("#createTree").bind("click", createTree);
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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>一次性加载大数据量</h1>
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<h6>[ 文件路径: bigdata/common.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><span>调整总节点数，测试加载速度：</span>
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<div id="ruler" class="ruler" title="拖拽可调整节点数">
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<div id="cursor" class="cursor">5000</div>
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</div>
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<div style="width:220px; text-align: center;">
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<span>checkbox</span><input type="checkbox" id="showChk" title="是否显示 checkbox" class="checkbox first" />
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[ <a id="createTree" href="#" title="初始化 zTree" onclick="return false;">初始化 zTree</a> ]
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</div>
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</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)、zTree v3.x 针对大数据量一次性加载进行了更深入的优化，实现了延迟加载功能，即不展开的节点不创建子节点的 DOM。</li>
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<li class="highlight_red">2)、对于每级节点最多一百左右，但总节点数几千甚至几万，且不是全部展开的数据，一次性加载的效果最明显，速度非常快。</li>
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<li class="highlight_red">3)、对于某一级节点数就多达几千的情况 延迟加载无效，这种情况建议考虑分页异步加载。</li>
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<li class="highlight_red">4)、对于全部节点都展开显示的情况，延迟加载无效，这种情况建议不要全部展开。</li>
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<li>5)、显示 checkbox / radio 会造成一定程度的性能下降。</li>
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<li>6)、利用 addDiyDom 功能增加自定义控件会影响速度，影响程度受节点数量而定。</li>
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<li>7)、利用 onNodeCreated 事件回调函数对节点 DOM 进行操作会影响速度，影响程度受节点数量而定。</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>不需要进行特殊的配置</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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