访问更新面板内动态添加的控件的值

发布于 2024-12-14 22:37:25 字数 908 浏览 2 评论 0原文

我有一个包含更新面板的页面，在其中，我们有一个占位符，当按下 button1 时，该占位符将填充一个文本框。

现在我需要访问当用户单击 Button2 时在文本框中输入的值。我正在努力寻找解决这个问题的简单方法。

请找到下面的代码片段。

<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:PlaceHolder ID="wplcHolder" runat="server"></asp:PlaceHolder>
        </ContentTemplate>
    </asp:UpdatePanel>
    <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
    <asp:Button ID="Button2" runat="server" Text="Button" onclick="Button2_Click" />
</div>
</form>

protected void Button1_Click(object sender, EventArgs e)
{
    TextBox _txt = new TextBox();
    wplcHolder.Controls.Add(_txt);
}

谢谢，钱德鲁

原文

I have a page which contains an update panel and inside it, we have a placeHolder which will be populated with a textbox when button1 is pressed.

Now I neeed to access the value entered in the textbox when the user click Button2. I am struggling to find a simple solution to this problem.

Please find the below code snippet.

<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:PlaceHolder ID="wplcHolder" runat="server"></asp:PlaceHolder>
        </ContentTemplate>
    </asp:UpdatePanel>
    <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
    <asp:Button ID="Button2" runat="server" Text="Button" onclick="Button2_Click" />
</div>
</form>

protected void Button1_Click(object sender, EventArgs e)
{
    TextBox _txt = new TextBox();
    wplcHolder.Controls.Add(_txt);
}

Thanks,
Chandru

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无人问我粥可暖 2024-12-21 22:37:25

我建议您在将文本框添加到占位符之前为其提供一个 ID，例如，假设您提供： yourTextBoxID

之后，理论上您可以通过 Button2_Click 执行此操作> 事件：

var myTextBox = (wplcHolder.FindControl("yourTextBoxID") as TextBox);

这可行，但前提是您在 Page_Init 中始终添加 yourTextBoxID 控件，因为如果您仅在触发新页面生命周期时从 Button1_Click 执行此操作通过单击 Button2 很可能文本框不会出现。

当然，所有这些都有待测试和验证；-)

I suggest you to give an ID to the textbox before adding it to the placeholder, for example let's say you give: yourTextBoxID

after that, in theory you could do this from your Button2_Click event:

var myTextBox = (wplcHolder.FindControl("yourTextBoxID") as TextBox);

this would work but only if you add the yourTextBoxID control all the times in the Page_Init because if you only do it from Button1_Click when a new page life cycle is triggered by clicking on Button2 most likely the textbox won't be there.

all to be tested and verified of course ;-)

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