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I've created a simple custom control
The custom control:
using System.Web.UI; //System.Web
using System.Web.UI.WebControls;
[assembly: TagPrefix("CustomControl", "temp")] //the dll file and its prefix "temp"
namespace CustomControl //which is added in the web.config file
{
[ToolboxData(@"<{0}:Temp runat=""server"" ID=""temp"" />")]
public class Temp : CompositeControl
{
public Label lbl;
protected override void CreateChildControls()
{
lbl = new Label();
lbl.Text = "Test of a label's text";
lbl.ID = "lbl_1";
this.Controls.Add(lbl); //Adds a label to this class
base.CreateChildControls(); //Create the control
}
public override void RenderControl(HtmlTextWriter writer)
{
if (!this.DesignMode)
{
lbl = new Label();
lbl.Text = "Test of a label's text 2!";
lbl.ID = "innerLBL";
lbl.RenderControl(writer);
}
}
}
}
My aspx-page:
<body>
<form id="form1" runat="server">
<temp:Temp runat="server" ID="testControl" /> <br />
<asp:Button runat="server" ID="testbtn" Text="test" onclick="testbtn_Click" /><br />
</form>
</body>
The label renders just fine, and at page load I am able to find the control named "testControl" which is of type "temp:Temp", through this code-behind code (C#):
protected void Page_Load(object sender, EventArgs e)
{
Control c = (Control)FindControl("testControl");
if (c != null)
{
lbl1.Text += [COLOR="#2e8b57"]"Control has been found[/COLOR]";
Temp tt = (Temp)c;
lbl1.Text += "[COLOR="lime"]No error upon casting control to my Temp-custom-control"[/COLOR]
[COLOR="red"] tt.lbl.Text = "This text never appears";[/COLOR]
//tt.lbl.Text does not change, although its normal text from the DLL file,
//"Test of a label's text 2" shows up every time. How can I get this control
//to change!
}
}
The button click
protected void testbtn_Click(object sender, EventArgs e)
{
Control c = (Control)FindControl("testControl");
if (c != null)
{
Temp lbl = (Temp)c;
[COLOR="red"] lbl.lbl.Text += "BUTTON CLICKED";[/COLOR]
}
}
The red lines does not work, they will not change my object from a custom control, or maybe it does change, but it just does not render? Hmmm...
What am I doing wrong?
Some rendering mistake?
Solved: Rendering mistake
base.Render(w); //Base render to writer labelControl.RenderControl(w); //After send your controls to render to browser
Edited by ManyTimes, 01 June 2011 - 08:11 AM.
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