有关级联菜单的问题

Question

哪位仁兄可以提供一下jsp中做级联菜单的源码？小弟不太懂，想弄一弄.

Answer 1

function dialectChange(){
    var selected = document.all.dialect.selectedIndex;
    document.all.driver.selectedIndex = selected;
}
function driverChange(){
    var selected = document.all.driver.selectedIndex;
    document.all.dialect.selectedIndex = selected;
}
<select name="dialect" onchange="dialectChange()">
    <option>数据库</option>
         <option value="">1</option>
    </select>
<select name="driver" onchange="driverChange()">
    <option>驱动程序</option>
         <option value="">1<option>
    </select>