下拉的selectedindex動態文本框

Question

我想創建5個文本框下拉選定的索引更改創建和4個文本框創建如果下拉索引是4.下拉是在asp.net updatepanel。更新面板中還有一個按鈕。當用戶點擊該按鈕時，無論在文本框中輸入什麼，都會顯示在標籤上。

請建議我的解決方案。

Answer 1

五月這項工作

<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+"-"; 
    } 

} 

Answer 2

你可以試試這個.....

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

更改ddlTest.SelectedIndex你的循環條件.....

Answer 3

赫斯的解決方案裏面創建的UpdatePanel 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 4

你可以試試這個...

//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; 
    } 

首先回路添加動態控制到面板，另一個迴路獲取對照值的....