本文实例讲述了jquery插件ztree实现单独选中根节点中第一个节点的方法。分享给大家供大家参考，具体如下：
1、实现代码：
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<!doctype html>
<html>
<head>
<title>ztree实现基本树</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<link rel="stylesheet" type="text/css" href="ztree_v3/css/demo.css" rel="external nofollow" >
<link rel="stylesheet" type="text/css" href="ztree_v3/css/ztreestyle/ztreestyle.css" rel="external nofollow" >
<script type="text/javascript" src="ztree_v3/js/jquery-1.4.4.min.js"></script>
<script type="text/javascript" src="ztree_v3/js/jquery.ztree.core.min.js"></script>
<script type="text/javascript">
<!--
var setting = {
data: {
simpledata: {
enable: true
}
}
};
var znodes =[
{ id:1, pid:0, name:"湖北省", open:true},
{ id:11, pid:1, name:"武汉市", open:true},
{ id:111, pid:11, name:"汉口"},
{ id:112, pid:11, name:"汉阳"},
{ id:113, pid:11, name:"武昌"},
{ id:12, pid:1, name:"黄石市"},
{ id:121, pid:12, name:"黄石港区"},
{ id:122, pid:12, name:"西塞山区"},
{ id:123, pid:12, name:"下陆区"},
{ id:124, pid:12, name:"铁山区"},
{ id:13, pid:1, name:"黄冈市"},
{ id:131, pid:13, name:"黄州区"},
{ id:132, pid:13, name:"麻城市"},
{ id:133, pid:13, name:"武穴市"},
{ id:134, pid:13, name:"团风县"},
{ id:135, pid:13, name:"浠水县"},
{ id:136, pid:13, name:"罗田县"},
{ id:137, pid:13, name:"英山县"},
{ id:2, pid:0, name:"湖南省", open:true},
{ id:21, pid:2, name:"长沙市", open:true},
{ id:211, pid:21, name:"芙蓉区"},
{ id:212, pid:21, name:"天心区"},
{ id:213, pid:21, name:"岳麓区"},
{ id:214, pid:21, name:"开福区"},
{ id:22, pid:2, name:"株洲市"},
{ id:221, pid:22, name:"天元区"},
{ id:222, pid:22, name:"荷塘区"},
{ id:223, pid:22, name:"芦淞区"},
{ id:224, pid:22, name:"石峰区"}
];
$(document).ready(function(){
$.fn.ztree.init($("#basetree"), setting, znodes);
});
/**
* 单独选中根节点中第一个节点
*/
function selectnodes()
{
var treeobj = $.fn.ztree.getztreeobj("basetree");
//获取节点
var nodes = treeobj.getnodes();
if (nodes.length>0)
{
var node = treeobj.selectnode(nodes[0]);
alert(node);
}
}
//-->
</script>
</head>
<body>
<div class="content_wrap">
<div class="ztreedemobackground left">
<ul id="basetree" class="ztree" style="height: 300px; width:200px; overflow-y: auto"></ul>
<input type="button" id="btn" onclick="selectnodes()" value="单独选中根节点中第一个节点"/>
</div>
</div>
</body>
</html>
2、实现效果图：
3、源码说明
单独选中根节点中第一个节点
var node = treeobj.selectnode(nodes[0]);
附：ztree_v3插件点击此处。
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