首頁 > 開發者 > JavaScript
本文執行個體講述了javascript實現在下拉式清單中顯示多級樹形菜單的方法。分享給大家供大家參考。具體如下：
這裡示範在下拉式清單方塊中顯示分級的菜單，在很多網站都可以看到的效果，很實用，下拉式清單方塊中的選項是利用JS控制輸出，如果你有更好的辦法不用JS來顯示，那最好了，因為像這種菜單用JS來實現，多多少少有點麻煩。
運行效果截圖如下：
具體代碼如下：
<!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>在下拉式清單中顯示的多級樹形菜單</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:'中國'}; 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:'俄羅斯'}; 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>
希望本文所述對大家的javascript程式設計有所協助。
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
