设置从代码隐藏中选择的单选按钮列表

发布于 2024-11-01 19:32:59 字数 478 浏览 5 评论 0原文

嘿，我有一个单选按钮列表，并尝试将其中一个单选按钮设置为基于会话变量进行选择，但事实证明这是不可能的。

<asp:radiobuttonlist id="radio1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged">
   <asp:listitem id="option1" runat="server" value="All"/>
   <asp:listitem id="option2" runat="server" value="1" />
   <asp:listitem id="option3" runat="server" value="2" />
</asp:radiobuttonlist>

即如何将 option2 设置为在代码后面选择？

原文

Hey I have a radiobuttonlist and trying to set one of the radiobuttons to selected based on a session variable but proving impossible.

<asp:radiobuttonlist id="radio1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged">
   <asp:listitem id="option1" runat="server" value="All"/>
   <asp:listitem id="option2" runat="server" value="1" />
   <asp:listitem id="option3" runat="server" value="2" />
</asp:radiobuttonlist>

I.e How can I set option2 to selected in code behind ?

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无语# 2024-11-08 19:32:59

我认为，最好的选择是使用 ListItem 的 Value 属性，该属性在 RadioButtonList 中可用。

我必须指出 ListItem 是否NOT 有 ID 属性。

因此，在您的情况下，要选择第二个元素（选项2），将是：

// SelectedValue expects a string
radio1.SelectedValue = "1";

或者，但以非常相同的方式，您可以向 SelectedIndex 提供一个 int 。

// SelectedIndex expects an int, and are identified in the same order as they are added to the List starting with 0.
radio1.SelectedIndex = 1;

The best option, in my opinion, is to use the Value property for the ListItem, which is available in the RadioButtonList.

I must remark that ListItem does NOT have an ID property.

So, in your case, to select the second element (option2) that would be:

// SelectedValue expects a string
radio1.SelectedValue = "1";

Alternatively, yet in very much the same vein you may supply an int to SelectedIndex.

// SelectedIndex expects an int, and are identified in the same order as they are added to the List starting with 0.
radio1.SelectedIndex = 1;

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傾旎 2024-11-08 19:32:59

您可以这样做：

radio1.SelectedIndex = 1;

但这是最简单的形式，随着 UI 的增长，很可能会出现问题。举例来说，如果团队成员在 option2 上方的 RadioButtonList 中插入一个项目，但不知道我们使用幻数在代码隐藏中进行选择 - 现在应用程序选择了错误的索引！

也许您想研究使用 FindControl 为了通过名称确定实际需要的ListItem，并进行适当的选择。例如：

//omitting possible null reference checks...
var wantedOption = radio1.FindControl("option2").Selected = true;

You could do:

radio1.SelectedIndex = 1;

But this is the most simple form and would most likely become problematic as your UI grows. Say, for instance, if a team member inserts an item in the RadioButtonList above option2 but doesn't know we use magic numbers in code-behind to select - now the app selects the wrong index!

Maybe you want to look into using FindControl in order to determine the ListItem actually required, by name, and selecting appropriately. For instance:

//omitting possible null reference checks...
var wantedOption = radio1.FindControl("option2").Selected = true;

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风吹短裙飘 2024-11-08 19:32:59

尝试这个选项：

radio1.Items.FindByValue("1").Selected = true;

Try this option:

radio1.Items.FindByValue("1").Selected = true;

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脸赞 2024-11-08 19:32:59

我们可以按值更改项目，技巧如下：

radio1.ClearSelection();
radio1.Items.FindByValue("1").Selected = true;// 1 is the value of option2

We can change the item by value, here is the trick:

radio1.ClearSelection();
radio1.Items.FindByValue("1").Selected = true;// 1 is the value of option2

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鹿港巷口少年归 2024-11-08 19:32:59

var rad_id = document.getElementById('<%=radio_btn_lst.ClientID %>');
var radio = rad_id.getElementsByTagName("input");
radio[0].checked = true;

//this for javascript in asp.net try this in .aspx page

// 如果您选择其他单选按钮，则将 [0] 增加到 [1] 或 [2]，如下所示

var rad_id = document.getElementById('<%=radio_btn_lst.ClientID %>');
var radio = rad_id.getElementsByTagName("input");
radio[0].checked = true;

//this for javascript in asp.net try this in .aspx page

// if you select other radiobutton increase [0] to [1] or [2] like this

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