动态加载文本框值的问题 [英] problem with dynamicall loaded textbox values

问题描述

我有一种情况需要从数据库到文本框显示数据。这些文本框必须动态创建并且可以编辑。我可以按如下方式创建文本框：

  string  [] myData = liD1.ToArray（）;  //   liD1是一个包含数据库值的列表 
  public   void  showData（）
 {
  for  （ int  i =  0 ; i <  myData.Length; i ++）
 {
  if （txtMore.FindControl（  txtD1StartTime + i）==  null ）
 {
 txtStart1 = < span class =code-keyword> new  TextBox（）; 
 
 lblStart1 =  new  Label（）; 
 
 txtStart1.ID =   txtD1S + i; 
 
 lblStart1.ID =   lblD1S + i; 
 
 txtStart1.Text = myData [i] .ToString（）; 
 
 lblStart1.AssociatedControlID = txtStart1.ID; 
 
 lblStart1.Text =  数据 + i; 
 
 txtMore.Controls.Add（lblStart1）; 
 
 txtMore.Controls.Add（txtStart1）; 
 
} 
} 
} 

在我的ascx页面中，我正在加载

中的那些文本框如下：

< ul  class  =   txtMore id =   txtMore runat =   server >  
 
 < /   ul  >  
 

showData（）函数正在使用动态创建的文本框加载数据。这工作正常。现在如果我编辑文本框并尝试获取新数据，它就不会给我任何东西。实际上它甚至找不到那种控制。代码如下所示：

  public   void  getData（）
 {
  for （ int  i =  0 ; i <  myData.Length; i ++）
 {
 TextBox t = txtMore.FindControl（  txtD1S + i） as  TextBox; 
 
  if （t！=  null ）
 {
  string  temp = t.Text; 
} 
} 

即使我在getData（）中动态加载了来自showData（）的文本框，它无法找到任何控制。请帮助。

解决方案

您需要为每个请求重新创建动态控件。

如何在ASP.NET中动态创建控件并从中检索值 [< a href =http://www.codeproject.com/Articles/502251/How-to-create-controls-dynamically-in-ASP-NET-andtarget =_ blanktitle =New Window> ^ ]

你应该使用 ASP.NET转发器控件 [ ^ ]



如需准备参考，请参阅以下代码：



Aspx页面：

 <   div  >  
 <   ul  < span class =code-keyword>>  
 <   asp：Repeater     runat   = 服务器    ID   =  rptTextList   >  
 <   ItemTemplate  > ;  
 <   li   >  
 <   asp：标签   文本  ='  < ％ = Eval（ 标题）％>'    runat   = 服务器    ID   =   lblText    /  < span class =code-keyword>>  
 <   asp：TextBox     runat   =  server    ID   =  txtText   文本  ='  <％ = Eval（  TextData）％>'    /  >  
 <   / li  >  
 <   / ItemTemplate  >  
 <   / asp：Repeater  >  
 <   / ul  >  
 <  < span class =code-leadattribute> / div  >  

.cs页面：

  foreach （RepeaterItem item  in  rptTextList.Items）
 {
 Label lblText =（Label）item.FindControl（  lblText）; 
 TextBox txtText =（TextBox）item.FindControl（  txtText）; 
 
 Response.Write（txtText.Text +  < br />）; 
} 

在页面渲染中更改ID ..您必须在页面指令级别使用。 的ClientIDMode = 静态

Hi,

I have a situation where I need to show data from database to textboxes. These textboxes has to be dynamically created and can be editable. I am able to create textboxes as follows:

string[] myData = liD1.ToArray(); //liD1 is a list that has values from database
public void showData()
{
	for (int i = 0; i < myData.Length; i++)
	{
		if (txtMore.FindControl("txtD1StartTime" + i) == null)
		{
			txtStart1 = new TextBox();
									 
			lblStart1 = new Label();
								   
			txtStart1.ID = "txtD1S" + i;
									 
			lblStart1.ID = "lblD1S" + i;
									  
			txtStart1.Text = myData[i].ToString();
										
			lblStart1.AssociatedControlID = txtStart1.ID;
			
			lblStart1.Text = "Data" + i;
								 
			txtMore.Controls.Add(lblStart1);
			
			txtMore.Controls.Add(txtStart1);
						  
		}
	}
}

In my ascx page, I am loading those textboxes in

as follows:

<ul class="txtMore" id="txtMore"  runat="server">

</ul>

showData() function is loading data with dynamically created textboxes. This is working fine. Now If i edit textboxes and try to get new data, it is not giving me anything. Actually it couldn't even find that control. Code is as shown below:

public void getData()
{
	for (int i = 0; i < myData.Length; i++)
	{
		TextBox t = txtMore.FindControl("txtD1S" + i) as TextBox;
		
		if (t != null)
		{
			string temp = t.Text;
	}
}

Even though I have dynamically loaded textboxes from showData(), in getData(),it is not able to find any control. Please help.

解决方案

You will need to re-create the dynamic controls for every request.
How to create controls dynamically in ASP.NET and retrieve values from it[^]

Hi,

You should have to use The ASP.NET Repeater Control[^]

For your ready reference see below code:

Aspx page:

<div>
            <ul>
                <asp:Repeater runat="server" ID="rptTextList" >
                    <ItemTemplate>
                        <li>
                            <asp:Label Text='<%= Eval("Title") %>' runat="server" ID="lblText" />
                            <asp:TextBox runat="server" ID="txtText" Text='<%= Eval("TextData") %>' />
                        </li>
                    </ItemTemplate>
                </asp:Repeater>
            </ul>
        </div>

.cs page:

foreach (RepeaterItem item in rptTextList.Items)
{
    Label lblText = (Label)item.FindControl("lblText");
    TextBox txtText = (TextBox)item.FindControl("txtText");

    Response.Write(txtText.Text + "<br/>");
}

IDs are changed in page rendering.. you have to use at page directive level. ClientIDMode="Static"

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