重置级联下拉值 [英] Reset Cascading dropdown value

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

您是否尝试过在重置"ddlPageNumbers"的代码中定义"ddlSubGroup"的onchange事件?

您也可以尝试在更改"ddlSubGroup"时使用客户端脚本.重置客户端本身的"ddlPageNumbers".

Have you tried defining an onchange event of "ddlSubGroup" in code behind where you reset the "ddlPageNumbers"?

You can also try client side script on change of "ddlSubGroup". Reset the "ddlPageNumbers" client side itself.

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

这篇关于重置级联下拉值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！