利用JS实现两个组合框（或者叫下拉框）的联动

利用JS实现两个组合框（或者叫下拉框）的联动

 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">




<html>




 <head>




  <title></title>




  <meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">




  <meta name="ProgId" content="VisualStudio.HTML">




  <meta name="Originator" content="Microsoft Visual Studio .NET 7.1">




 </head>




 <body>




  <form name="doublecombo" ID="Form1">




   <p>




    <select name="example" size="1" onChange="redirect(this.options.selectedIndex)" ID="Select1">




     <option>国外JavaScript技术网站</option>




     <option>国内JavaScript技术网站</option>




     <option>国外的著名搜索引擎</option>




    </select>




    <select name="stage2" size="1" ID="Select2">




     <option value="http://wsabstract.com



">Website Abstraction</option>




     <option value="http://www.dynamicdrive.com



">Dynamicdrive.com</option>




     <option value="http://javascript.internet.com



">JavaScript</option>




    </select>




    <input type="button" name="test" value="Go!" onClick="go()" ID="Button1">




   </p>




   <script>




<!--




/*




  Double Combo Script Credit




  By Website Abstraction (www.wsabstract.com



)




  Over 200+ free JavaScripts here!




  */




var groups=document.doublecombo.example.options.length




  var group=new Array(groups)




  for (i=0; i<groups; i++)




  group[i]=new Array()




group[0][0]=new Option("Website Abstraction","http://wsabstract.com



")




  group[0][1]=new Option("Dynamicdrive.com","http://www.dynamicdrive.com



")




  group[0][2]=new Option("JavaScript","http://javascript.internet.com



")




group[1][0]=new Option("万旭JavaScript仓库","http://www.wanxu.com



")




  group[1][1]=new Option("JavaScript2000","http://www.javascript2000.com



")




  group[1][2]=new Option("无忧脚本","http://www.51js.com



")




group[2][0]=new Option("Hotbot","http://www.hotbot.com



")




  group[2][1]=new Option("Infoseek","http://www.infoseek.com



")




  group[2][2]=new Option("Excite","http://www.excite.com



")




  group[2][3]=new Option("Lycos","http://www.lycos.com



")




var temp=document.doublecombo.stage2




function redirect(x){




  for (m=temp.options.length-1;m>0;m--)




  temp.options[m]=null




  for (i=0;i<group[x].length;i++){




  temp.options[i]=new Option(group[x][i].text,group[x][i].value)




  }




  temp.options[0].selected=true




  }




function go(){




  location=temp.options[temp.selectedIndex].value




  }




  //-->




   </script>




  </form>




 </body>




</html>