I am having trouble with my modalpopup extender. When the user clicks an 'Add' button, a dynamic textbox is created within the popup. However, I am struggling to get a reference to this textbox in the codebehind.
Adding a 'textchanged' event handler to the textbox does not work as expected. Since it requires AutoPostBack to be true, the modalpopup is destroyed before the event fires. Even if I try to reshow the modalpopup, the dynamic field disappears.
Here is the ASP code for the modalpopup:
<asp:ModalPopupExtender ID="PayDetail_ModalPopupExtender" runat="server" PopupControlID="PayDetailPopupPanel" TargetControlID="btnShowDetailPopup"
CancelControlID="btnClosePayDetail" BackgroundCssClass="modalBackground">
</asp:ModalPopupExtender>
<asp:Button ID="btnShowDetailPopup" runat="server" style="display:none" />
<asp:Panel ID="PayDetailPopupPanel" runat="server" CssClass="modalPayPopup" align="center" style = "display:none">
<asp:table id="addClaimDetailTable" runat="server" class="table" >
<asp:TableRow style="display:none">
<asp:TableCell >
<asp:Label ID="lblPayHeaderID" runat="server" Text="Pay Header ID:"></asp:Label>
</asp:TableCell>
<asp:TableCell >
<asp:TextBox ID="txtPayHeaderID" runat="server" Enabled="false"></asp:TextBox>
</asp:TableCell>
</asp:TableRow>
</asp:table>
</asp:Panel>
To create a dynamic textbox in the codebehind:
TableRow tRow = new TableRow();
TableCell hCell = new TableCell();
TableCell dCell = new TableCell();
Label lblHeader = new Label();
lblHeader.ID = "lblMedicare";
lblHeader.Text = "Medicare:";
TextBox txtData = new TextBox();
txtData.ID = "txtMedicare";
txtData.Text = "";
txtData.TextChanged += new EventHandler(txtData_TextChanged);
txtData.AutoPostBack = true;
PayDetailDynamicList.Add(txtData);
hCell.Controls.Add(lblHeader);
dCell.Controls.Add(txtData);
tRow.Controls.Add(hCell);
tRow.Controls.Add(dCell);
addClaimDetailTable.Controls.Add(tRow);
The textbox is stored in a static list:
static List<TextBox> PayDetailDynamicList = new List<TextBox>();
And here is the codebehind for the eventhandler:
void txtData_TextChanged(object sender, EventArgs e)
{
TextBox t = sender as TextBox;
if (t == null)
throw new ArgumentException("sender not a textbox", "sender");
string value = t.Text;
string id = t.ID;
}
I need help figuring out how to store the user-entered data or get a reference to the dynamic textbox. Any suggestions on better ways to achieve this are appreciated. Thank you!