我有2个dropdownlist,我想实现:比如第一个dropdownlist选择A,则第二个自动加载a,b,c,d,e在里面;第一个dropdownlist选择B,则第二个自动加载f,g,h,i.
请问如何实现,
请给出代码或Demo
有文章能解决也给分!分只给正确的人!!
请问如何实现,
请给出代码或Demo
有文章能解决也给分!分只给正确的人!!
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<head>
</head>
<body>
<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; //初始化下拉列表 清空下拉数据
document.form1.s2.options[0] = new Option('==请选择==',''); //给第一个值
for (i=0; i<subcat.length; i++) //legth=20
{
if (subcat[i][0] == locationid) //[0] [1] 第一列 第二列
{document.form1.s2.options[document.form1.s2.length] = new Option(subcat[i][1], subcat[i][2]);} //建立option
//第一次 length=1 因为有==请选择==
//i=9时 length= 10 值有11个 因为从0数起 subcat[i][0] == locationid屏蔽了再写
}
}
//-->
</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>
private void DDLB_SelectedIndexChanged(object sender, System.EventArgs e)
{
this.DDLE.Items.Clear();
if(this.DDLB.SelectedItem.Text =="男")
{
this.DDLE.Items.Add("a");
this.DDLE.Items.Add("b");
this.DDLE.Items.Add("c");
this.DDLE.Items.Add("d");
this.DDLE.Items.Add("e");
}
else
{
this.DDLE.Items.Add("f");
this.DDLE.Items.Add("g");
this.DDLE.Items.Add("h");
this.DDLE.Items.Add("i");
}
}
{
string s = this.DropDownList1.SelectedItem.Value; string[] L1 = {"a","b"};
string[] L2 = {"c","d"}; this.DropDownList2.Items.Clear();
switch(s)
{
case "A":
foreach(string i in L1)
{
this.DropDownList2.Items.Add( i );
}
break;
case "B":
foreach(string i in L2)
{
this.DropDownList2.Items.Add( i );
}
break;
default:
break;
}
}
if(DropDownList2.SelectedValue == "A") {
DropDownList1.Items.Add("a");
DropDownList1.Items.Add("b");
}
}
无刷新的
{
svalue=mydown1.SelectedValue.ToString();
DownBind2();
}
private void mydown2_SelectedIndexChanged(object sender, System.EventArgs e)
{
svalue=mydown2.SelectedValue.ToString();
DownBind3();
}
private void DownBind1()
{
//显示所有的主分类
string sql = "select id,parentid,context from tree_Asset where id>0 and id<100 order by parentid asc ";
DataTable mytab = this.Get_Dt(sql); //绑定第一个下拉框
this.mydown1.DataSource = mytab;
this.mydown1.DataValueField = "id";
this.mydown1.DataTextField = "context";
this.mydown1.DataBind(); //添加一个"请选择"行
this.mydown1.Items.Insert(0,new ListItem("请选择","")); //为此下拉框添加一个默认选择项(此处默认为sortid = 1
//做选项时,如果你添加的选定项而此控件中却没有此项,即会出错
//如:this.mydown1.SelectedValue = "1";
//所以此处以如下方式进行选定
ListItem myItem = this.mydown1.Items.FindByValue("1");
if(myItem != null)
{
myItem.Selected = true;
} //为此下拉框添加选择事件,第一个参数是自己,第二个参数为要填充的下拉框的名称
} /// <summary>
/// 绑定第二个下拉框
/// </summary>
private void DownBind2()
{
//显示所有的主分类
try
{
int svalue1=Convert.ToInt32(svalue);
string sql = "select id,parentid,context from tree_Asset where id>99 and id<1000 and parentid="+svalue1+" order by parentid asc";
DataTable mytab = this.Get_Dt(sql); //绑定第一个下拉框
this.mydown2.DataSource = mytab;
this.mydown2.DataValueField = "id";
this.mydown2.DataTextField = "context";
this.mydown2.DataBind(); //添加一个"请选择"行
this.mydown2.Items.Insert(0,new ListItem("请选择",""));
}
catch{}
}
/// <summary>
/// 绑定第三个下拉框
/// </summary>
private void DownBind3()
{
try
{
//显示所有的主分类
int svalue2=Convert.ToInt32(svalue);
string sql = "select id,parentid,context from tree_Asset where id>99999 and id<1000000 and parentid="+svalue2+" order by parentid asc";
DataTable mytab = this.Get_Dt(sql); //绑定第一个下拉框
this.mydown3.DataSource = mytab;
this.mydown3.DataValueField = "id";
this.mydown3.DataTextField = "context";
this.mydown3.DataBind(); //添加一个"请选择"行
this.mydown3.Items.Insert(0,new ListItem("请选择",""));
}
catch{}
}