点击按钮让所有控件Enable全为False(用javascript)

Question

我在Asp.net的用户控件里,我想用javascript实现,当点击Button(btnSave)时,所有按钮的Enable都为False,试了多次都不行,但在不是用户控件的页面就行.就用document.getElementById("txtCode").disabled=true;.但在用户控件就是不行.请大家帮看下...代码如下:
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="AcademyUC.ascx.cs" Inherits="manager_UserControl_AcademyUC" %>
<script language="javascript" type="text/javascript">
<!--function btnAdd_onclick() 
{
    document.getElementById("txtCode").disabled=true;
}// -->
</script><table width="658" height="180" border="1">
 <tr>
    <td colspan="4" bgcolor="lavender"><center>
        学院信息</center></td>
  </tr>
  <tr>
    <td colspan="4" style="height: 26px">
        &nbsp;
        <input id="btnAdd" style="position: relative" type="button" value="增加" language="javascript" onclick="return btnAdd_onclick()" />
        &nbsp;<asp:Button
            ID="btnModify" runat="server" Style="position: relative" Text="修改" />&nbsp;<asp:Button
                ID="btnDelete" runat="server" Style="position: relative" Text="删除" />
        <asp:Button ID="btnSave" runat="server" Style="position: relative" Text="保存" OnClick="btnSave_Click" />
        <asp:Button ID="btnCancel" runat="server" Style="position: relative" Text="取消" />
        </td>
  </tr>
  <tr>
    <td>&nbsp;编号:</td>
    <td>&nbsp;<asp:TextBox ID="txtCode" runat="server" Style="position: relative; left: 1px; top: -2px;" ></asp:TextBox></td>
      <td rowspan="2">
          备注:&nbsp;</td>
      <td rowspan="2">
          &nbsp;
          <asp:TextBox ID="txtRes" runat="server" Height="54px" Style="left: -5px; position: relative; top: 1px;"
              TextMode="MultiLine" Width="210px"></asp:TextBox></td>
  </tr>
  <tr>
    <td>&nbsp;名称:</td>
    <td>&nbsp;<asp:TextBox ID="txtName" runat="server" Style="position: relative; left: 2px; top: 0px;"></asp:TextBox>*</td>
  </tr>
  <tr>
    <td colspan="4" bgcolor="lavender"><center>
        &nbsp;</center></td>
  </tr>
  <tr>
    <td colspan="4">&nbsp;<asp:GridView ID="GridView1" runat="server" Style="position: relative" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" CellPadding="3" AutoGenerateColumns="False" >
        <FooterStyle BackColor="White" ForeColor="#000066" />
        <RowStyle ForeColor="#000066" />
        <Columns>
            <asp:CommandField ShowDeleteButton="True" />
            <asp:BoundField DataField="AcademyCode" HeaderText="编号" />
            <asp:BoundField DataField="AcademyName" HeaderText="名称" />
            <asp:BoundField DataField="Res" HeaderText="备注" />
        </Columns>
        <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
        <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
        </asp:GridView>
        &nbsp;</td>
  </tr>
</table>

Answer 1

function DisableAllControls(){
var ctls=document.getElementsByTagName("INPUT");
if(ctls){
for(var i=0;i<ctls.length;i++){
ctls[i].disabled=true;} 
} 
}试试这个

Answer 2

楼上提供的办法可以把生成页面后的类型为"input"的disabled变成True,就连Button也起变化.但我只想TextBox有变化,那就不行...

Answer 3

加一个类型判断
function DisableAllControls(){ 
var ctls=document.getElementsByTagName("INPUT"); 
if(ctls){ 
for(var i=0;i  <ctls.length;i++){ 
if(ctls[i].type=='text')
ctls[i].disabled=true;} 
} 
}