<asp:DropDownList ID="drp_dept" runat="server" DataTextField="dept_name" DataValueField="dept_ID" OnSelectedIndexChanged="drp_dept_SelectedIndexChanged">
</asp:DropDownList> <asp:DropDownList ID="drp_major" runat="server" Width="115px" DataTextField="major_name" DataValueField="major_ID">
</asp:DropDownList>

protected void drp_dept_SelectedIndexChanged(object sender, EventArgs e)
{
string str_dr2 = "select * from lab_major where dept_ID='"+drp_dept.SelectedValue.ToString()+"'";
co_class_add.dr_Bind(str_dr2,drp_major);
drp_major.DataBind();
}

[此贴子已经被作者于2007-6-5 16:51:47编辑过]

也不提示错误 就是点了drp_dept这个下拉框后 没任何反应

恩 好象有点头绪了 我去看看

是的

好的

结果是点了下拉框还是没反应,但在点了确认button时(确认是将我填写的东西提交)
就又跳到page_load函数了,之后才跳到protected void drp_dept_SelectedIndexChanged(object sender, EventArgs e)

[此贴子已经被作者于2007-6-5 17:01:05编辑过]

public void dr_Bind(string strCmd, DropDownList dr)
{
SqlDataAdapter adp = new SqlDataAdapter(strCmd, myConnection);
DataSet ds = new DataSet();
adp.Fill(ds);
dr.DataSource = ds;
return;
}

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string str_dept = "select * from lab_dept";
string str_major = "select * from lab_major";
string str_grade = "select * from lab_grade";
co_class_add.dr_Bind(str_dept, drp_dept);
drp_dept.DataBind();
co_class_add.dr_Bind(str_major, drp_major);
drp_major.DataBind();
co_class_add.dr_Bind(str_grade, drp_grade);
drp_grade.DataBind();
if (Request["Action"] == "edit")
{
string num = Request["Class_num"];
string sqlstr = "select * from lab_class where class_num like " + num + "";
SqlConnection sqlconn = new SqlConnection(ConfigurationManager.ConnectionStrings["labConnectionString"].ConnectionString);
SqlDataAdapter da = new SqlDataAdapter(sqlstr, sqlconn);
DataSet ds = new DataSet();
da.Fill(ds);
txt_class.Text = ds.Tables[0].Rows[0]["class_ID"].ToString();
txt_num.Text = ds.Tables[0].Rows[0]["class_stunum"].ToString();
txt_bizhu.Text = ds.Tables[0].Rows[0]["class_bizhu"].ToString();
drp_dept.SelectedValue = ds.Tables[0].Rows[0]["dept_ID"].ToString();
drp_major.SelectedValue = ds.Tables[0].Rows[0]["major_ID"].ToString();
drp_grade.SelectedValue = ds.Tables[0].Rows[0]["class_grade"].ToString();
}
}
}

放到程序里绑定了

可我在程序里写了啊你看
<asp:DropDownList ID="drp_dept" runat="server" Width="115px" DataTextField="dept_name" DataValueField="dept_ID" OnSelectedIndexChanged="drp_dept_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="drp_major" runat="server" Width="115px" DataTextField="major_name" DataValueField="major_ID">
</asp:DropDownList>

恩 我想知道 为什么这个函数不是在下拉框选项变了时触发,而是点了button后触发啊?