Sometimes, it may be necessary to style a given row/header in Telerik RadGrid, whenever the user hovers with the mouse over it. With RadGrid this functionality is easily achievable. The control provides a CSS class like GridRowOver_<SkinName>. Such style is present under each embedded skin and defines the visual appearance of the hovered grid row. For example:

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.GridRowOver_[SkinName]
{
background-color: orange;
cursor:pointer;
}

To enable the hover style for the grid rows, merely set the ClientSettings -> EnableRowHoverStyle property of RadGrid to true.

Note
This depends on RadGrid client-side object. For performance reasons, the RadGrid client object is available only when certain client features/events are enabled. If no client features/events are available in the grid but you still need this functionality, you can attach an empty javascript function to a client event (for example OnRowClick).

If you want to attain the same functionality without the built-in feature of RadGrid for ASP.NET AJAX or with disabled skins, the steps below show how to achieve this:

1. Create the Telerik RadGrid instance and the data source to which it will be bound.

2. Create a style class, in the head section of the .aspx code, which will be used to style the active row/header. This may look something like this:

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<style type="text/css">
  .RowMouseOver td
  {
    background-color: lightblue !important;
  }
  .RowMouseOut
  {
    /*this style is taken from the corresponding skin's GridRow_[SkinName] class - GridRow_Default in our case*/
    background: #f7f7f7;
  }
  .HeaderMouseOver
  {
    background-color: lightblue !important;
  }
  .HeaderMouseOut
  {
    /*this style is taken from the corresponding skin's th.GridHeader class - th.GridHeader_Default in our case*/
    background: white url('Img/GridHeaderBg.gif') repeat-x bottom;
  }
</style>

3. This particular approach relies on the OnRowMouseOver, OnRowMouseOut, OnColumnMouseOver and OnColumnMouseOut client-side functions, to use the style mentioned above. Declare these functions in the ClientSettings ->ClientEvents section of the grid declaration like this:

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<ClientSettings>
    <ClientEvents OnRowMouseOver="RowMouseOver" OnRowMouseOut="RowMouseOut" OnColumnMouseOver="ColumnMouseOver"
        OnColumnMouseOut="ColumnMouseOut" />
</ClientSettings>

4. Before the grid tag on the page or in the head section, include the client-side JavaScript functions mentioned above:

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<script type="text/javascript">
  function RowMouseOver(sender, eventArgs) {
    $get(eventArgs.get_id()).className = "RowMouseOver";
  }
  function RowMouseOut(sender, eventArgs) {
    $get(eventArgs.get_id()).className = "RowMouseOut";
  }
  function ColumnMouseOver(sender, eventArgs) {
    eventArgs.get_gridColumn().get_element().className = "HeaderMouseOver";
  }
  function ColumnMouseOut(sender, eventArgs) {
    eventArgs.get_gridColumn().get_element().className = "HeaderMouseOut";
  }</script>

After these steps have been performed, when the user hovers with the mouse over the control, the styles mentioned above will be applied, as shown in the following screenshot: