如何让dropdownlist和textbox关联起来

Question

不太懂你的意思
如果要找到某个textbox的话
可以使用FindControl("textbox"+dropdownlist.SelectedValue);
类似把

Answer 1

<form id="Form1"  runat="server">
<TR>
          <TD  style="BACKGROUND-COLOR: #EFEFEF" bordercolor="#FFFFFF" width="70">
            <font size="2" face="楷体_GB2312">姓名</font></TD>
          <TD   class=catBottom style="BACKGROUND-COLOR: #EFEFEF; " bordercolor="#FFFFFF" width="20">
            <font size="2" face="楷体_GB2312">
            <asp:TextBox id="T1" style="border:1px dotted #999999; WIDTH: 90px; COLOR: #000000; HEIGHT: 20px; BACKGROUND-COLOR: #FFFFFF; font-style:normal; font-variant:normal; font-weight:normal; font-size:12px; font-family:楷体_GB2312, Geneva, sans-serif" runat="server"/>
</font></TD>
<TR>
          <TD  style="BACKGROUND-COLOR: #EFEFEF" bordercolor="#FFFFFF" width="70">
            <font size="2" face="楷体_GB2312">岗位职责</font></TD>
          <TD   class=catBottom style="BACKGROUND-COLOR: #EFEFEF; " bordercolor="#FFFFFF" width="20">
            <font size="2" face="楷体_GB2312">
            <asp:TextBox id="T4" style="border:1px dotted #999999; WIDTH: 90px; COLOR: #000000; HEIGHT: 20px; BACKGROUND-COLOR: #FFFFFF; font-style:normal; font-variant:normal; font-weight:normal; font-size:12px; font-family:楷体_GB2312, Geneva, sans-serif" runat="server"/>
</font></TD>
<TD class=catBottom style="BACKGROUND-COLOR: #EFEFEF; " bordercolor="#FFFFFF" width="107">
            <font size="2" face="楷体_GB2312">您与机构信息化的关系</font></TD>
          <TD  style="BACKGROUND-COLOR: #EFEFEF" bordercolor="#FFFFFF" width="429">
            <font size="4" face="楷体_GB2312">
            <asp:DropDownList id="t6" AutoPostBack=True  OnSelectedIndexChanged="Change" style="font-family: 楷体_GB2312; font-size: 9pt" runat="server">
                    <asp:ListItem>决策者</asp:ListItem> 
                    <asp:ListItem>规划者</asp:ListItem> 
                    <asp:ListItem>使用者</asp:ListItem> 
                    <asp:ListItem>建议者</asp:ListItem> 
                    <asp:ListItem >其它</asp:ListItem> 
        </asp:DropDownList>
</font></TD>
<TR>
          <TD  style="BACKGROUND-COLOR: #EFEFEF" colspan="4">
            <font size="2" face="楷体_GB2312">
            <asp:TextBox id="d1"  Visible=False  style="border:1px dotted #999999; WIDTH: 90px; COLOR: #000000; HEIGHT: 20px; BACKGROUND-COLOR: #FFFFFF; font-style:normal; font-variant:normal; font-weight:normal; font-size:12px; font-family:楷体_GB2312, Geneva, sans-serif" runat="server"/>
</font>
            <p>
         <TR>
          <TD class=catBottom style="BACKGROUND-COLOR: #DEE3E7" colspan="4">
            <font size="2" face="楷体_GB2312">邮政编码</font></TD>
          <TD   class=catBottom style="BACKGROUND-COLOR: #EFEFEF; " bordercolor="#FFFFFF" width="20">
            <font size="2" face="楷体_GB2312">
            <asp:TextBox id="T3" style="border:1px dotted #999999; WIDTH: 90px; COLOR: #000000; HEIGHT: 20px; BACKGROUND-COLOR: #FFFFFF; font-style:normal; font-variant:normal; font-weight:normal; font-size:12px; font-family:楷体_GB2312, Geneva, sans-serif" runat="server"/>
</font></TD>
<TR>
          <TD  style="BACKGROUND-COLOR: #EFEFEF" bordercolor="#FFFFFF" width="70">
            <font size="2" face="楷体_GB2312">工作单位</font></TD>
          <TD   class=catBottom style="BACKGROUND-COLOR: #EFEFEF; " bordercolor="#FFFFFF" width="20">
            <font size="2" face="楷体_GB2312">
            <asp:TextBox id="T2"  style="border:1px dotted #999999; WIDTH: 90px; COLOR: #000000; HEIGHT: 20px; BACKGROUND-COLOR: #FFFFFF; font-style:normal; font-variant:normal; font-weight:normal; font-size:12px; font-family:楷体_GB2312, Geneva, sans-serif" runat="server"/>
</font></TD>
<TR>
          <TD  style="BACKGROUND-COLOR: #EFEFEF" bordercolor="#FFFFFF" width="70">
            <font size="2" face="楷体_GB2312">电子邮箱</font></TD>
          <TD   class=catBottom style="BACKGROUND-COLOR: #EFEFEF; " bordercolor="#FFFFFF" width="20">
            <font size="2" face="楷体_GB2312">
            <asp:TextBox id="T5"  style="border:1px dotted #999999; WIDTH: 90px; COLOR: #000000; HEIGHT: 20px; BACKGROUND-COLOR: #FFFFFF; font-style:normal; font-variant:normal; font-weight:normal; font-size:12px; font-family:楷体_GB2312, Geneva, sans-serif" runat="server"/>
</font></TD>
<TR>
          <TD  style="BACKGROUND-COLOR: #EFEFEF" bordercolor="#FFFFFF" width="70">
            </p>
            <ASP:DataGrid id="MyDataGrid" runat="server" 
                   AllowPaging="false"
                   PageSize="50"
                   PagerStyle-Mode="NumericPages"
                   PagerStyle-HorizontalAlign="Right"
        
                   BackColor="#EFEFEF"
                   BorderColor="#ffffff"
                   ShowFooter="false"
                   BorderWidth="1"
                   GridLines="Both"
                   CellPadding="3"
                   CellSpacing="0"
                   width="100%" 
                   height="10"
                   Font-Name="Verdana"
                   Font-Size="10pt"
                   HeaderStyle-BackColor="#d1d7dc"
                   AlternatingItemStyle-BackColor="#DEE3E7"
                   AutoGenerateColumns="false"
                   DataKeyField="id"
                   
             
             >           <Columns>
          
                  <asp:BoundColumn HeaderText="序号"
                  ItemStyle-Width="5%"
                  ItemStyle-horizontalalign="Center"
          headerstyle-horizontalalign="Center" 
          DataField="id" />
                   
                  <asp:BoundColumn HeaderText="姓名"
                  ItemStyle-Width="15%"
                  ItemStyle-horizontalalign="Center"
          headerstyle-horizontalalign="Center" 
          DataField="pname" />
                  
             <asp:BoundColumn HeaderText="工作单位"
                  ItemStyle-Width="15%"
                  ItemStyle-horizontalalign="Center"
          headerstyle-horizontalalign="Center" 
          DataField="gongzuodanwei" />
      
     
             <asp:BoundColumn HeaderText="邮政编码"
                  ItemStyle-Width="15%"
                  ItemStyle-horizontalalign="Center"
          headerstyle-horizontalalign="Center" 
          DataField="youbian" />
  
         <asp:BoundColumn HeaderText="岗位职责"
                  ItemStyle-Width="15%"
                  ItemStyle-horizontalalign="Center"
          headerstyle-horizontalalign="Center" 
          DataField="gangweizhize" />
          
          <asp:BoundColumn HeaderText="电子邮箱"
                  ItemStyle-Width="15%"
                  ItemStyle-horizontalalign="Center"
          headerstyle-horizontalalign="Center" 
          DataField="dianziyouxiang" />
          
          
          
          <asp:BoundColumn HeaderText="关系"
                  ItemStyle-Width="15%"
                  ItemStyle-horizontalalign="Center"
          headerstyle-horizontalalign="Center" 
          DataField="gx" />

Answer 2

应该是你的程序没有控制好吧.
在DropDownList的SelectIndexChanged事件处理过程中实现下面的逻辑：
当你选择DropDownList的某一项时，将TextBox.Visible=True
当选择的是其他项时TextBox.Visible=False

Answer 3

switch(d1.SelectedItem.Value)
{
case "其它":
this.d1.Visible=true;
break;
        case "决策者":
this.d1.Visible=false;
break;
case "规划者":
this.d1.Visible=false;
break;
case "建议者":
this.d1.Visible=false;
break;
        case "使用者":
this.d1.Visible=false;
break;
        }
}
是这样的效果么

Answer 4

可是，系统提示说
“/”应用程序中的服务器错误。
--------------------------------------------------------------------------------编译错误 
说明: 在编译向该请求提供服务所需资源的过程中出现错误。请检查下列特定错误详细信息并适当地修改源代码。 编译器错误信息: CS0117: “System.Web.UI.WebControls.TextBox”并不包含对“SelectedItem”的定义源错误: 行 50： public void Change(Object sender,System.EventArgs e)
行 51： {
行 52：  switch(d1.SelectedItem.Text)
行 53：  {
行 54：  case "其它":