The example in this article describes the method of using JavaScript to display a multi-level tree menu in a drop-down list. Share it with everyone for your reference. The details are as follows:
Here is a demonstration of displaying hierarchical menus in a drop-down list box. The effect can be seen on many websites. It is very practical. The options in the drop-down list box use JS to control the output. If you have a better way, you can do it without JS. Display, that would be the best, because it is somewhat troublesome to implement a menu like this with JS.
The screenshot of the running effect is as follows:
The specific code is as follows:
<!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 =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 = 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>
I hope this article will be helpful to everyone’s JavaScript programming design.