动态填充DropDownList，AutoPostback和JavaScript错误 [英] Dynamically populating a DropDownList, AutoPostback and JavaScript error

问题描述

你好，


我正在尝试使用asp.net创建一个请求表单，当用户选择一个复选框时，下拉列表应该动态显示。我在网上看过很少的java脚本，但我想知道如果没有java脚本我是否能实现这个目标。


我试图使控件不可见（< asp：DropDownList ID =" DropDownList1" runat =" server" AppendDataBoundItems =" True" Visible =" False ">）并且在onselectedindexchanged事件中，尝试将invisible属性设置为true。但它没有帮助我。

另外，当我选择一个复选框时，我试图使用页面回发（asp：CheckBoxList ID =" chckbx" runat =" server" AutoPostBack =" ; true" onselectedindexchanged =" chckbx_SelectedIndexChange d"）并且它在IE中抛出一个错误，说该对象不支持此属性。



有人可以请帮助我这个。在此先感谢。

hello,

i am trying to create a request form using asp.net where when a user selects a checkbox, a dropdown should appear dynamically. I have seen few java-scripts in web, but I was wondering if I can achieve this without java-script.

I tried to make the control invisible(<asp:DropDownList ID="DropDownList1" runat="server" AppendDataBoundItems="True" Visible="False">) and in the onselectedindexchanged event, tried to make the invisible property to true. But it did not help me.
Also, I was trying to use postback for the page when a checkbox is selected(asp:CheckBoxList ID="chckbx" runat="server" AutoPostBack="true" onselectedindexchanged="chckbx_SelectedIndexChange d") and it throws me an error in IE saying the object does not support this property.


Can somebody please help me with this. Thanks in advance.

推荐答案

在继续之前，请看一下这篇文章：
如何在ASP.NET中使用动态控件。


-Frinny

Before you continue please take a look at this article on:
How to use dynamic controls in ASP.NET.

-Frinny

感谢您的回复。


我能够理解链接中的示例，但无法真正将其放入为我的场景工作。

thank you for the reply.

I am able to understand the example in the link but could not really put it into working for my scenario.

好的，在你的场景中，当用户选中一个复选框时你需要这样做。

我假设你需要根据用户检查的内容填充下拉列表。


这不是动态创建控件。


你需要什么要做的是动态填充下拉列表。


您目前有什么可以作为起点？


-Frinny

（PS请发布代码代码标签）

Ok, in your scenario you need to do this when the user checks a checkbox.
I''m assuming that you need to populate the drop down list with items depending on what the user has checked.

This is not dynamically creating a control.

What you need to do is dynamically populate the drop down list.

What do you have currently that we can use as a starting point?

-Frinny
(PS please post code in code tags)

这篇关于动态填充DropDownList，AutoPostback和JavaScript错误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！