现有三个下拉框，zhang,mu,jie对应三个表:t_zhang,t_mu,t_jie
结构如下：
t_zhang
id int
zhang_name 章名称t_mu
id int
mu_name 目名称
zhang_id 对应t_zhang表的ID值t_jie
id int
jie_name 节名称
mu_id 对应t_mu表的ID值这三个表其实就是一个树形结构的目录，现在需要我选择某一章后自动把目的下拉框内容填充为
select id,mu_name from t_mu where zhang_id = 选择的章ID
同时节的下拉框用（select id,jie_name from t_jie where mu_id = 目的第一项）填充，同理用户选择目后用（select id,jie_name from t_jie where mu_id = 选择的目ID）填充节！
我改怎么做？大家务必详细一些，我是刚从.net转过来的！！！
结构如下：
t_zhang
id int
zhang_name 章名称t_mu
id int
mu_name 目名称
zhang_id 对应t_zhang表的ID值t_jie
id int
jie_name 节名称
mu_id 对应t_mu表的ID值这三个表其实就是一个树形结构的目录，现在需要我选择某一章后自动把目的下拉框内容填充为
select id,mu_name from t_mu where zhang_id = 选择的章ID
同时节的下拉框用（select id,jie_name from t_jie where mu_id = 目的第一项）填充，同理用户选择目后用（select id,jie_name from t_jie where mu_id = 选择的目ID）填充节！
我改怎么做？大家务必详细一些，我是刚从.net转过来的！！！
但页面上的其他FORM内容不变.
我不想使用javascrip,我看到java中有不少web框架像struts,jfc,这些都不能实现吗？我这几年一直用.net,但因为公司的需要我现在正在为一个java项目做预研，请大家帮帮我！！！
2.就是每次选择上级下拉框时，提交到服务器，把下级下拉框要的数据取出来...两种做法各有优缺点，无非就是速度的问题了
自己决定把
把如下代码加入<body>区域中
<!-- 二级联动 Start --><script language="JavaScript">
<!--var subcat = new Array();
subcat[0] = new Array('10','1','=1')
subcat[1] = new Array('10','2','=2')
subcat[2] = new Array('10','3','=3')
subcat[3] = new Array('10','4','=4')
subcat[4] = new Array('10','5','=5')
subcat[5] = new Array('10','6','=6')
subcat[6] = new Array('10','7','=7')
subcat[7] = new Array('10','8','=8')
subcat[8] = new Array('10','9','=9')
subcat[9] = new Array('10','10','=10')
subcat[10] = new Array('20','11','=11')
subcat[11] = new Array('20','12','=12')
subcat[12] = new Array('20','13','=13')
subcat[13] = new Array('20','14','=14')
subcat[14] = new Array('20','15','=15')
subcat[15] = new Array('20','16','=16')
subcat[16] = new Array('20','17','=17')
subcat[17] = new Array('20','18','=18')
subcat[18] = new Array('20','19','=19')
subcat[19] = new Array('20','20','=20')function changeselect1(locationid)
{
document.form1.s2.length = 0;
document.form1.s2.options[0] = new Option('==请选择==','');
for (i=0; i<subcat.length; i++)
{
if (subcat[i][0] == locationid)
{document.form1.s2.options[document.form1.s2.length] = new Option(subcat[i][1], subcat[i][2]);}
}
}
//-->
</script><form name="form1">二级联动：<select name="s1" onChange="changeselect1(this.value)">
<option>==请选择==</option>
<option value="10">1-10</option>
<option value="20">11-20</option>
</select><select name="s2" onChange="alert(this.value)">
<option>==请选择==</option>
</select></form><!-- 二级联动 Over --><!-- 三级联动 Start --><script language="JavaScript">
<!--var subval = new Array();
subval[0] = new Array('10','单数','1','=1')
subval[1] = new Array('10','双数','2','=2')
subval[2] = new Array('10','单数','3','=3')
subval[3] = new Array('10','双数','4','=4')
subval[4] = new Array('10','单数','5','=5')
subval[5] = new Array('10','双数','6','=6')
subval[6] = new Array('10','单数','7','=7')
subval[7] = new Array('10','双数','8','=8')
subval[8] = new Array('10','单数','9','=9')
subval[9] = new Array('10','双数','10','=10')
subval[10] = new Array('20','单数','11','=11')
subval[11] = new Array('20','双数','12','=12')
subval[12] = new Array('20','单数','13','=13')
subval[13] = new Array('20','双数','14','=14')
subval[14] = new Array('20','单数','15','=15')
subval[15] = new Array('20','双数','16','=16')
subval[16] = new Array('20','单数','17','=17')
subval[17] = new Array('20','双数','18','=18')
subval[18] = new Array('20','单数','19','=19')
subval[19] = new Array('20','双数','20','=20')function changeselect2()
{
document.form2.s2.length = 0;
document.form2.s2.options[0] = new Option('==请选择==','');
document.form2.s2.options[1] = new Option('选择单数','单数');
document.form2.s2.options[2] = new Option('选择双数','双数');
document.form2.s3.length = 0;
document.form2.s3.options[0] = new Option('==请选择==','');
}function changeselect3(sub1,sub2)
{
document.form2.s3.length = 0;
document.form2.s3.options[0] = new Option('==请选择==','');
for (i=0; i<subval.length; i++)
{
if ((subval[i][0] == sub1) & (subval[i][1] == sub2))
{document.form2.s3.options[document.form2.s3.length] = new Option(subval[i][2], subval[i][3]);}
}
}
//-->
</script><form name="form2">三级联动：<select name="s1" onChange="changeselect2()">
<option>==请选择==</option>
<option value="10">1-10</option>
<option value="20">11-20</option>
</select><select name="s2" onChange="changeselect3(document.form2.s1.value,this.value)">
<option>==请选择==</option>
</select><select name="s3" onChange="alert(this.value)">
<option>==请选择==</option>
</select></form><!-- 三级联动 Over -->