ASP.NET Behaviour of dynamically added controls

jimbozo · 28-08-2006 12:24PM #1

I have code which loops through and IDataReader adding a checkbox to a tablecell for each record. I need to have the tablecells change color when the checkboxes are checked and unchecked. Preferrable without a roundtrip to the server.

C# code

	while (data.Read())
	{
		.......

		for (cellCtr = 1; cellCtr <= cellCnt; cellCtr++) 
		{
			TableCell tCell = new TableCell();
			tCell.RowSpan = 1;
			tRow.Cells.Add(tCell);

			CheckBox cb = new CheckBox ();
			cb.Checked = false;
			cb.Text = Field1.ToString();
			cb.ID = Field1.ToString();
			cb.ToolTip = Field2.ToString();
	
			//Add the description of the value
			tCell.Controls.Add (cb);
		}
	}

Thanks in advance. I am relatively inexperienced in C# and have not been able to figure this one out.

Evil Phil · 28-08-2006 02:28PM

IDataReader - Is it a custom object? If its a DataReader object (or something that implements IEnumerable) then you could bind it to a datagrid and use column templates for the checkboxes and include some javascript in the html to change the background of the cell.

Kernel32 · 28-08-2006 02:31PM

Why not use a datalist or something. Thats what the controls are for.

jimbozo · 28-08-2006 03:33PM

Thanks for the suggestions guys....I got this from a friend:

Add a JavaScript client-side event handler to each cell?
// Server-side:
cb.Attribute.add("onclick","changeColor(this.parent)")

// Then put this in the <head> of your page:
<script type="text/javascript">
function changeColor(cell)
{
oldBgColour = '#000000'; // default colour
newBgColour = '#FFFFFF'; // highlight colour
if (cell.style.backgroundColor == oldBgColour)
{
cell.style.backgroundColor = newBgColour;
}
else
{
cell.style.backgroundColor = oldBgColour;
}
</script>

This assumes the parent of the checkbox is the cell.

</end>

Anyway it works apart from the Javascript which I am tweaking and I will post it when I have finished. Cheers Jim.

ASP.NET Behaviour of dynamically added controls

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