保留下拉列表的大小 [英] Retaining the size of the drop down list

问题描述

我有2个下拉列表。当我从第一个ddl中选择第一个值时，第二个ddl被禁用。当我从第一个ddl中选择第二个值时，第二个ddl启用。这正是我所需要的。但有一个问题。当第二个ddl被禁用时，其大小会自动增加&我不希望这样。 T使用了表，更新面板，触发器，内容面板，仍然无法正常工作。

我附上了部分代码。请帮助。

I have 2 drop down lists. When i select 1st value from the 1st ddl, the 2nd ddl gets disabled. When i select 2nd value from 1st ddl, the 2nd ddl enables. This just what I needed. But there is a problem. When the 2nd ddl gets disabled, its size increases automatically & I don't want that. T have used table, update panel, trigger, content panel, still its not working.
I am attaching the portion of the code. Kindly help.

<td>
<label>Activity&nbsp;</label>
</td>
<td>
<asp:UpdatePanel ID="Update_Panel1" runat="server">
<contenttemplate>
<asp:DropDownList ID="ddl_Activity1" runat="server" AutoPostBack="True" 

class="w100" onselectedindexchanged="ddl_Activity1_SelectedIndexChanged">     
<asp:ListItem Text="Create Permanent Water Holes" Value="1">
<asp:ListItem Text="Improve Water Storage" Value="2">

</contenttemplate>
<triggers>
<asp:AsyncPostBackTrigger ControlID="ddl_SubActivity1" EventName="SelectedIndexChanged"/>
</triggers>

</td>
<td>
<asp:label ID="lbl_SubActivity1" runat="server">Sub&nbsp;Activity
</td>
<td>
<asp:UpdatePanel ID="Update_Panel2" runat="server">
<contenttemplate>
<asp:DropDownList ID="ddl_SubActivity1" runat="server" 

class="w100" AutoPostBack="True">
<asp:ListItem Text="Desilting" Value="1">
<asp:ListItem Text="Deepening" Value="2">
<asp:ListItem Text="Repairing" Value="3">

</contenttemplate>
<triggers>
<asp:AsyncPostBackTrigger ControlID="ddl_SubActivity1" EventName="SelectedIndexChanged"/>
</triggers>
    
</td>

推荐答案

为DropDownList定义所需的大小（宽度）并检查它

Define a desired size (width) to the DropDownList and check it

<asp:DropDownList ID="ddl_SubActivity1" runat="server" Width="100px"

            class="w100" AutoPostBack="True">

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