finding an HtmlGenericControl
Question
System.Web.UI.HtmlControls.HtmlGenericControl div = (System.Web.UI.HtmlControls.HtmlGenericControl)pnl.Controls[0].FindControl("divMessage");
i am trying to find divMessage somethign like the above but i am getting null...:
below is how my div resides.
<mobile:Panel ID="pnl" Runat="server">
<mobile:DeviceSpecific ID="device" runat="server">
<ContentTemplate>
<div id="divMessage" runat="server">test.....</div>
</ContentTemplate>
</mobile:DeviceSpecific>
</mobile:Panel>
3 answers
solution1
6 ACCPTED 2011-03-10 18:42:38
This should find the div you needed:
var div = (HtmlGenericControl)pnl.Controls[0].FindControl("divMessage");
I created a new page and tested through it:
<%@ Page Language="C#" Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile"
Namespace="System.Web.UI.MobileControls"
Assembly="System.Web.Mobile" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
var div = (HtmlGenericControl)pnl.Controls[0].FindControl("divMessage");
}
</script>
<body>
<mobile:form id="form1" runat="server">
<mobile:panel id="pnl" runat="server">
<mobile:DeviceSpecific ID="device" runat="server">
<Choice>
<ContentTemplate>
<div id="divMessage" runat="server">test.....</div>
</ContentTemplate>
</Choice>
</mobile:DeviceSpecific>
</mobile:panel>
</mobile:form>
</body>
</html>
The div variable contains the control you need.
solution2
3 2011-03-10 18:08:03
The easiest way to find the control is to do a recursive search, as your current method is probably failing due to the way the controls are nested.
/// <summary>
/// Recursive FindControl method, to search a control and all child
/// controls for a control with the specified ID.
/// </summary>
/// <returns>Control if found or null</returns>
public static Control FindControlRecursive(Control root, string id)
{
if (id == string.Empty)
return null;
if (root.ID == id)
return root;
foreach (Control c in root.Controls)
{
Control t = FindControlRecursive(c, id);
if (t != null)
{
return t;
}
}
return null;
}
You can then use this method in the following way:
HtmlGenericControl div = (HtmlGenericControl) FindControlRecursive(pnl, "divMessage");
solution3
0 2011-03-10 18:05:28
I believe the problem is because the pnl control does not contain divMessage. You have to iterate down into the containing controls to find it.
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