Question

我想创建5个在下拉选择的索引更改时创建的文本框，如果下拉索引是4，则创建4个文本框。下拉列表位于asp.net updatepanel中。内部更新面板中还有一个按钮。当用户点击该按钮时，无论在文本框中输入什么内容，都会显示在标签上。

请建议我解决。

Answer 1

你可以试试这个......

 for (int i = 0; i < ddlTest.SelectedIndex; i++)
    {
        TextBox txt = new TextBox();
        txt.ID = "txt" + i.ToString();
        PlaceHolder1.Controls.Add(txt);
    }

将ddlTest.SelectedIndex更改为循环条件.....

Answer 2

她的解决方案是在updatepanel内创建txtbox

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:Panel ID="Panel1" runat="server">

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
 <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="False">
 <asp:ListItem Value="1">one </asp:ListItem><asp:ListItem Value="2">Two </asp:ListItem><asp:ListItem Value="3">Three </asp:ListItem><asp:ListItem Value="4">Four</asp:ListItem>


    </asp:DropDownList>
 <br />
    <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

    <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</ContentTemplate>



</asp:UpdatePanel>

protected void Button1_Click(object sender, EventArgs e)
{
    int noOftextbox =Convert.ToInt32(DropDownList1.SelectedItem.Value);

    for (int i = 0; i < noOftextbox; i++)
    {
        TextBox txtbox = new TextBox();
        txtbox.ID = i.ToString();
        txtbox.Visible = true;
        txtbox.Height = 30;
        txtbox.Width = 100;
        txtbox.Text = "txt" + i.ToString();
        PlaceHolder1.Controls.Add(txtbox);
        //UpdatePanel1.Controls.Add(txtbox);
        //UpdatePanel1.Controls.Add(new LiteralControl("<br/>"));
    }

}

Answer 3

你可以试试这个......

//Add Control into Panel 
    for (int i = 0; i < 5; i++)
    {
        TextBox txt = new TextBox();
        txt.ID = "txt" + i.ToString();
        txt.Text = "this is text:" + i.ToString();
        pnlTest.Controls.Add(txt);
    }

    //Fetch Value from Panel
    for (int i = 0; i < pnlTest.Controls.Count; i++)
    {
        string val = ((TextBox)pnlTest.Controls[i]).Text;
    }

第一个循环用于向面板添加动态控制，另一个循环用于从控制中获取值....

Answer 4

愿这项工作

    <div>

</div><asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:Panel ID="Panel1" runat="server">

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
 <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" 
        onselectedindexchanged="DropDownList1_SelectedIndexChanged"><asp:ListItem Value="1">one </asp:ListItem><asp:ListItem Value="2">Two </asp:ListItem><asp:ListItem Value="3">Three </asp:ListItem><asp:ListItem Value="4">Four</asp:ListItem>
    </asp:DropDownList>
 <br />
   <asp:Button ID="Button2" runat="server" Text="fectchText" onclick="Button2_Click" />
    <br />

    <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
    <br />
    <br />
    <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
</ContentTemplate>

    protected void Page_Load(object sender, EventArgs e)
{
    if (Page.IsPostBack)
    {
        if (ViewState["mode"].ToString() == "1")
            createTextbox();
        ViewState.Add("mode", "1");
    }
    else
    {
        ViewState.Add("mode", "0");
    }
}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
    createTextbox();
}

public void createTextbox()
{
    int noOftextbox = Convert.ToInt32(DropDownList1.SelectedItem.Value);
    for (int i = 0; i < noOftextbox; i++)
    {
        TextBox txtbox = new TextBox();
        txtbox.ID = "txt" + i;
        txtbox.Visible = true;
        txtbox.Height = 30;
        txtbox.Width = 100;
        UpdatePanel1.ContentTemplateContainer.Controls.Add(txtbox);
        PlaceHolder1.Controls.Add(txtbox);
     }
}

protected void Button2_Click(object sender, EventArgs e)
{
    int nocount=    Convert.ToInt32(DropDownList1.SelectedItem.Value);
    for (int count = 0; count <= nocount-1 ; count++)
    {
     TextBox txtRead = (TextBox)PlaceHolder1.FindControl("txt" + (count));
     Label1.Text += txtRead.Text+"-";
    }

}

下拉列表的selectedindex上的动态文本框

4 个答案: