Hi,
A've appended a piece of HTML code (wrapped around a <DIV>) with JavaScript for use of a tooltip.
This tooltip appears on "onmouseover" a row and dissapears on "onmouseout" of the row. In javascript a catches those events and displays tooltip or hides it.
When the users select criteria's with no result comming from the same page WITH result the tooltip stays displayed because the row "onmouseover" occured in the fraction of a second the dropdownlist disapeared and the mousecursor is inevitable over a row WITH data, then the new pages load but of course the "onmouseout" of the row never occured and the tooltip still displays the data.
So I want to hide this <div> element when there are no rows in the datalist. Therefor I must acces to this <DIV> element in my code behind but this <DIV> element is only dynamicly created at runtime not at design time.
If someone please can help me...
Thx!

There are a few options. One would be to assign it a custom attribute, such as isTooltip="true" using setAttribute when you create it. When your page loads and you know there are none to display loop through all the divs using document.getElementsByTagName and then test if getAttribute("isTooltip") returns anything. If it does set the style.display to "none" or remove the div entirely.

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Joe (Microsoft MVP - XML)

Thx for th reply, but it's not quite a useful answer.
Let me explain myself:
I add
 row.Attributes.Add("onmouseover", "JSfunction_that_makes_tooltip");
and
  row.Attributes.Add("onmouseout", "JSfunction_that_hides_tooltip");
for each row in the DataList.OnDataBinding() event.

The problem is that the whole tooltip is made in javascript (no reference what so ever in my code or design.)
The DropDownList used to select a criteria is located just above the DataList so when you choose a different criteria in de DropDownList the list disapears for 0.5 of a second and the "onmouseover" event is fired in javascript of the row that was just underneath the selected dropdownlist item.
Now the real problem is that when the DataList has no rows. The tooltip still displays the previous row-data of the previous DataList.

So I'm looking for a way to say in my C#-code that:
if(DataList.Rows.Count <= 0) ? "tooltip".visible=false: "tooltip".visible = true;
This would be very simple if I would be able to access that <DIV> in my C#.

Dear swifty

You are programming in .Net, so you can use Panel control instead of creating your tooltip DIV element dynamically on client side. Use a panel control as a tooltip and give it an id (like 'tooltip') so you could access it in your C# code behind. As user changes drop down list, you can set panel's visibility easily as below :

if(DataList.Rows.Count <= 0) ? tooltip.visible=false: tooltip.visible = true;