javascript实现的树型下拉框改进版_导航菜单

原理是先顺序加载根节点，在加载每个根节点后，再遍历每个数组，看有没有以这个根节点为父节点的数组，如果有，就加载到下拉框，然后再递归看有没有以这个节点为父结点的数组，如果有，再加载到下拉框，以此类推...
代码如下：

<title> javascript树型菜单 author:sclsch@188.com</title> <meta name="generator" content="editplus"> <meta name="author" content=""> <meta name="keywords" content=""> <meta name="description" content=""> <script type="text/javascript"> var data =new Array(); data[0]= {id:'0',pid:'1',text:'河北'}; data[1]= {id:'1',pid:'-1',text:'中国'}; data[2]= {id:'2',pid:'6',text:'莫斯科'}; data[3]= {id:'3',pid:'0',text:'邯郸'}; data[4]= {id:'4',pid:'0',text:'石家庄'}; data[5]= {id:'5',pid:'3',text:'邯郸县'}; data[6]= {id:'6',pid:'-1',text:'俄罗斯'}; data[7]= {id:'7',pid:'5',text:'孙程亮 sclsch@188.com'}; function TreeSelector(item,data,rootId){ this._data = data; this._item = item; this._rootId = rootId; } TreeSelector.prototype.createTree = function(){ var len =this._data.length; for( var i= 0;i<len;i++){ if ( this._data[i].pid == this._rootId){ this._item.options.add(new Option(".."+this._data[i].text,this._data[i].id)); for(var j=0;j<len;j++){ this.createSubOption(len,this._data[i],this._data[j]); } } } } TreeSelector.prototype.createSubOption = function(len,current,next){ var blank = ".."; if ( next.pid == current.id){ intLevel =0; var intlvl =this.getLevel(this._data,this._rootId,current); for(a=0;a<intlvl;a++) blank += ".."; blank += "├-"; this._item.options.add(new Option(blank + next.text,next.id)); for(var j=0;j<len;j++){ this.createSubOption(len,next,this._data[j]); } } } TreeSelector.prototype.getLevel = function(datasources,topId,currentitem){ var pid =currentitem.pid; if( pid !=topId) { for(var i =0 ;i<datasources.length;i++) { if( datasources[i].id == pid) { intLevel ++; this.getLevel(datasources,topId,datasources[i]); } } } return intLevel; } //www.jb51.net 脚本之家 </script> <select id="myselect"> </select> <script language="javascript" type="text/javascript"> var ts = new TreeSelector(document.getElementById("myselect"),data,-1); ts.createTree(); </script>
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