无法在IE浏览器中获取列表框选定的值 [英] Unable to get Listbox selected value in IE browser

问题描述

大家好，

我已经在代码中添加了列表框

Hello all,

I have added listbox in my code

<asp:ListBox ID="LststateList" runat="server" Width="180px" SelectionMode="Single"

 Height="350px"CssClass="textbox3"></asp:ListBox>

和Linkbutton的onclick事件，我正在验证列表框是否选择了任何值，以下是我的linkbutton

and onclick event of Linkbutton i am verifying that listbox have selected any value or not below is my linkbutton

<asp:LinkButton ID="lnkgo" runat="server" OnClick="Go_Click" Text="Go to this page"></asp:LinkButton>

<pre lang="cs">protected void Go_Click(object sender, EventArgs e)
        {
string sb = string.Empty;
           for (int i = 0; i < LststateList.Items.Count; i++)
            {
                if (LststateList.Items[i].Selected == true)
                {
                    sb = Convert.ToString(LststateList.Items[i].Value);
                }
            }
            if (string.IsNullOrEmpty(sb))
            {
               -----            }}

这里的问题是，当我从列表框中选择任何值并单击链接按钮时，列表框将始终显示所选值= false，
我不知道发生这种情况的原因，而且这种情况仅在IE中出现，

还有我在

here problem is the,when i select any value from list box and click on linkbutton then Listbox always display selected value=false,
I dont know reason why this happend,and its occured in IE Only,

and one thing that I have added all above controls in

<div></div> 

标签.

tag.

help me about that.

推荐答案

您的代码似乎还可以.

您有其他问题.这是页面回发.
发生什么情况，当您单击服务器按钮时，将发生页面回发，并且我确定您在page_load事件中具有一些加载列表框的代码.

试试这个

Your code seems perfectly okay.

You have a different problem. It is page postback.
What happens, when you click a server button, the page postback occurs and I am sure you have some code of loading list box in page_load event.

Try this

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
          //fill up your listbox here
    }
}

这会起作用.

欢呼

This will work.

cheers

请尝试

Hi,
Please try

if (LststateList.Items[i].Selected == true)
                {
                    sb = LststateList.Items[i].Value.ToString();
                }

对我有用.

谢谢.

It is working for me.

Thank you.

我同意Sandip，您的代码很好.

在ASP.NET页面生命周期中，将首先执行Page_Load，然后单击事件按钮.

因此，您需要验证是否添加条件if(！Page.IsPostBack).

I agree to Sandip, your code is fine.

In ASP.NET Page Life Cycle, the Page_Load will be executed first and then the event button click.

So you need to validate adding the condition if(!Page.IsPostBack).

if (!IsPostBack)
{
    var query = your query;

    ListBox1.DataSource = query;
    ListBox1.DataBind();
}

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