动态地添加文本框为空的按钮点击 [英] Dynamically added TextBoxes empty on button click
问题描述
我动态地添加文本框，当我点击提交按钮，有一个回传，我看不出值输入到文本框，所有的都上来了emtpy。这里的.aspx页面中... \\
形式ID =form1的=服务器＆GT;
＆LT; ASP：占位符ID =phFormContent=服务器＆GT; ＆LT; / ASP：占位符＆GT;
＆LT; BR /＆GT;＆LT; BR /＆GT;
＆LT; ASP：按钮的ID =btnAddForm=服务器文本=添加表的OnClick =btnAddForm_Click/＆GT;
＆LT; ASP：按钮的ID =btnSubmitForms=服务器文本=提交表单的OnClick =btnSubmit_Click/＆GT;
＆LT; /表及GT;
在这里......是我如何添加文本框窗体上点击btnAddForm ...
保护无效btnAddForm_Click（对象发件人，EventArgs的发送）
{
//创建标签
标签lblName =新的Label（）;
lblName.Text =NAME：
标签lblNumber =新的Label（）;
lblNumber.Text =NUMBER;
标签lblAddress =新的Label（）;
lblAddress.Text =地址;
标签lblCompany =新的Label（）;
lblCompany.Text =公司; //创建文本框
文本框txtName的=新的TextBox（）;
文本框txtNumber =新的TextBox（）;
文本框txtAddress =新的TextBox（）;
文本框txtCompany =新的TextBox（）; //创建提交按钮
按钮btnSubmit按钮=新按钮（）;
btnSubmit.Text =提交; //创建面板，添加控件
面板pnlForm =新面板（）;
pnlForm.Controls.Add（lblName）;
pnlForm.Controls.Add（txtName的）;
pnlForm.Controls.Add（新LiteralControl（＆LT; BR /＆GT;＆LT; BR /＆gt;中））;
pnlForm.Controls.Add（lblNumber）;
pnlForm.Controls.Add（txtNumber）;
pnlForm.Controls.Add（新LiteralControl（＆LT; BR /＆GT;＆LT; BR /＆gt;中））;
pnlForm.Controls.Add（lblAddress）;
pnlForm.Controls.Add（txtAddress）;
pnlForm.Controls.Add（新LiteralControl（＆LT; BR /＆GT;＆LT; BR /＆gt;中））;
pnlForm.Controls.Add（lblCompany）;
pnlForm.Controls.Add（txtCompany）;
pnlForm.Controls.Add（新LiteralControl（＆LT;小时/＆gt;中））;
pnlForm.Controls.Add（新LiteralControl（＆LT; BR /＆GT;＆LT; BR /＆gt;中））;
panels.Add（pnlForm）; 的foreach（在面板控制面板）
{
phFormContent.Controls.Add（面板）;
}
}
...这里就是我尝试提取字段每个面板添加...
私有静态无效GetFormFields（控制panelControl）
{
的ControlCollection控制= panelControl.Controls;
的foreach（在panelControl.Controls控制childControl）
{
如果（childControl.GetType（）的ToString（）==System.Web.UI.WebControls.TextBox）
{
TXT文本框= childControl为文本框;
fields.Add（TXT）;
}
其他
{
GetFormFields（childControl）;
}
}
}
面板和字段是静态的列表，每个包含四个字段面板。我通过GetFormFields个别面板的参考...
私有静态列表＆lt;控制＆GT;面板=新的List＆lt;控制＆GT;（）;
私人静态列表＆LT;＆文本框GT;域=新的List＆LT;＆文本框GT;（）;
尝试动态地添加他们在 Page_Init 事件。通常情况下，这将确保他们通过回传坚持。如果你不能做到这一点，你必须看看$ P $通过存储在的ViewState 。
I'm adding TextBoxes dynamically and when I click a submit button and have a postback, I can't see the values entered into the TextBoxes, all are coming up emtpy. Here's the .aspx page...\
form id="form1" runat="server">
<asp:PlaceHolder ID="phFormContent" runat="server">
</asp:PlaceHolder>
<br /><br />
<asp:Button ID="btnAddForm" runat="server" Text="Add Form" OnClick="btnAddForm_Click" />
<asp:Button ID="btnSubmitForms" runat="server" Text="Submit Forms" OnClick="btnSubmit_Click" />
</form>
...here's how I add the TextBoxes to the form on clicking btnAddForm...
protected void btnAddForm_Click(object sender, EventArgs e)
{
// Create Labels
Label lblName = new Label();
lblName.Text = "NAME:";
Label lblNumber = new Label();
lblNumber.Text = "NUMBER:";
Label lblAddress = new Label();
lblAddress.Text = "ADDRESS:";
Label lblCompany = new Label();
lblCompany.Text = "COMPANY:";
// Create Text Boxes
TextBox txtName = new TextBox();
TextBox txtNumber = new TextBox();
TextBox txtAddress = new TextBox();
TextBox txtCompany = new TextBox();
// Create submit button
Button btnSubmit = new Button();
btnSubmit.Text = "SUBMIT";
// Create panel and add controls
Panel pnlForm = new Panel();
pnlForm.Controls.Add(lblName);
pnlForm.Controls.Add(txtName);
pnlForm.Controls.Add(new LiteralControl("<br /><br />"));
pnlForm.Controls.Add(lblNumber);
pnlForm.Controls.Add(txtNumber);
pnlForm.Controls.Add(new LiteralControl("<br /><br />"));
pnlForm.Controls.Add(lblAddress);
pnlForm.Controls.Add(txtAddress);
pnlForm.Controls.Add(new LiteralControl("<br /><br />"));
pnlForm.Controls.Add(lblCompany);
pnlForm.Controls.Add(txtCompany);
pnlForm.Controls.Add(new LiteralControl("<hr />"));
pnlForm.Controls.Add(new LiteralControl("<br /><br />"));
panels.Add(pnlForm);
foreach (Control panel in panels)
{
phFormContent.Controls.Add(panel);
}
}
...and here's how I try to extract the fields for each individual panel added...
private static void GetFormFields(Control panelControl)
{
ControlCollection controls = panelControl.Controls;
foreach (Control childControl in panelControl.Controls)
{
if (childControl.GetType().ToString() == "System.Web.UI.WebControls.TextBox")
{
TextBox txt = childControl as TextBox;
fields.Add(txt);
}
else
{
GetFormFields(childControl);
}
}
}
panels and fields are static List, each panel containing four fields. I pass GetFormFields an individual panel reference...
private static List<Control> panels = new List<Control>();
private static List<TextBox> fields = new List<TextBox>();
Try dynamically adding them on the Page_Init event. Typically this will ensure they persist through PostBack. If you can't do this, you'll have to look at preserving their data manually by storing in ViewState.
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