重置级联下拉值

问题描述

我已经搜索了很多天，但是找不到答案，
我会在这里尝试非常具体:

1)我有4个Cascading DropDown命名(每个都连接到ajaxToolkit:CascadingDropDown扩展器)
2)下拉列表按以下顺序命名(asp代码如下)
ddlCatalogueName> ddlMainGroup> ddlSubGroup> ddlPageNumbers，

3)ddlPageNumbers是ddlSubGroup的子项，并且ddlPageNumbers包含的项目始终从1开始，然后一直到页数(例如1/2/3或1/2/3/4或仅1)

4)选择ddlPageNumbers项后，当我想移到另一个子组(ddlSubGroup)时，ddlPageNumbers不会恢复为1，它保持不变(2-3-4，无论我之前选择的是什么)

我需要一种方法时，选择了另一ddlSubGroup重置ddlPageNumbers.
可以在以下示例中找到一个工作示例:

www.turkeyautospareparts.com/catalogue.aspx


我愿意接受所有建议.

在此先感谢大家.

Hi,
I''ve been googling for many days now but can''t find an answer ,
I''ll try to be very specific here:

1) I have 4 Cascading DropDown named (each connected to ajaxToolkit:CascadingDropDown extender)
2) The dropdowns are named in the following order (asp code below )
ddlCatalogueName > ddlMainGroup > ddlSubGroup > ddlPageNumbers ,

3)ddlPageNumbers is child of ddlSubGroup , and ddlPageNumbers contains items always starting from 1 and then upto number of pages (ex. 1/2/3 or 1/2/3/4 or only 1)

4) After selecting a ddlPageNumbers item, when i want to move to another Subgroup (ddlSubGroup) ,ddlPageNumbers doesn''t revert back to 1 , it stays the same (2-3-4 whatever i previously chose)

I need a way to reset ddlPageNumbers , when another ddlSubGroup is selected.
A working example can be seen at :

www.turkeyautospareparts.com/catalogue.aspx


I am open to all suggestions.

Thanks in avance to everybody.

<br />
------------RELATED .aspx code --------------<br />
<br />
<pre><br />
<asp:DropDownList ID="ddlCatalogueName" runat="server" Width="180px" AutoPostBack="true" /><br />
<br /><br />
<asp:DropDownList ID="ddlMainGroup" runat="server" Width="180px" AutoPostBack="true" /><br />
<br /><br />
<asp:DropDownList ID="ddlSubGroup" runat="server" Width="180px" AutoPostBack="true" /><br />
<br /><br />
<asp:DropDownList ID="ddlPageNumbers" runat="server" Width="60px" AutoPostBack="true" /><br />
<br /><br />
<br />
<ajaxToolkit:CascadingDropDown ID="cddCatalogueName" runat="server" TargetControlID="ddlCatalogueName" Category="CatalogueName" PromptText="Choose a Catalogue..." LoadingText="Please wait ..." ServicePath="Catalogue.asmx"<br />
ServiceMethod="GetCatalogueName"><br />
</ajaxToolkit:CascadingDropDown><br />
<br />
 <ajaxToolkit:CascadingDropDown ID="cddMainGroup"  runat="server" TargetControlID="ddlMainGroup"  ParentControlID="ddlCatalogueName"  Category="MainGroup" PromptText="Choose a Group..."   LoadingText="Please wait ..."   ServicePath="Catalogue.asmx"  ServiceMethod="GetMainGroup" ><br />
 </ajaxToolkit:CascadingDropDown><br />
<br />
 <ajaxToolkit:CascadingDropDown ID="cddSubGroup"  runat="server" TargetControlID="ddlSubGroup"  ParentControlID="ddlMainGroup"  Category="SubGroup"  PromptText="Choose a Sub Group..."  LoadingText="Please wait ..."  ServicePath="Catalogue.asmx"  ServiceMethod="GetSubGroup" ><br />
 </ajaxToolkit:CascadingDropDown><br />
<br />
 <ajaxToolkit:CascadingDropDown ID="cddPageNumbers"  runat="server" TargetControlID="ddlPageNumbers"  ParentControlID="ddlSubGroup"  Category="Pages"  LoadingText="Please wait ..."  ServicePath="Catalogue.asmx"  ServiceMethod="GetPageNumbers" SelectedValue="1"  ><br />
 </ajaxToolkit:CascadingDropDown><br />
</pre><br />
------------ END OFRELATED .aspx code --------------</pre><br />
<br />

推荐答案

ddlSubGroup.Attributes.Add("onchange", "javascript:ResetPageNoDDL();");

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