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Select显示多级分类列表

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>在下拉列表中显示的多级树形菜单</title><meta http-equiv="content-type" content="text/html;charset=gb2312"><script type="text/javascript"> var data =http://www.mamicode.com/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:河南}; data[4]= {id:4,pid:0,text:北京}; data[5]= {id:5,pid:3,text:湖南}; data[6]= {id:6,pid:-1,text:俄罗斯}; function TreeSelector(item,data,rootId){ this._data =http://www.mamicode.com/ 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; } </script> </head><body><select id="myselect"></select> <script language=javascript type="text/javascript"> var ts = new TreeSelector(document.getElementById("myselect"),data,-1); ts.createTree(); </script> </body></html>