效果如下图所示：
实现原理：
为DataGrid中的每一行，绑定onmouseover、onmousemove、onmouseout事件，使的鼠标移动到行内时，自动显示一个<div>，鼠标移出该行，就把这个<div>隐藏掉。
实现代码：
前台：
1． 定义<div>的样式：
<style type="text/css">
.transparent { FILTER: alpha(opacity=85);
BORDER-TOP: indianred 1px solid;
BORDER-RIGHT: indianred 1px solid;
BORDER-LEFT: indianred 1px solid;
BORDER-BOTTOM: indianred 1px solid;
POSITION: absolute;
BACKGROUND-COLOR: infobackground;
DISPLAY: none }
</style>
2． 显示和隐藏窗体的脚本：
<script language="javascript">
//显示弹出窗体
function Show(Country, City, Address, PostalCode, Phone, Fax)
{
document.getElementById("td1").innerText="国家："+Country;
document.getElementById("td2").innerText="城市："+City;
document.getElementById("td3").innerText="地址："+Address;
document.getElementById("td4").innerText="邮政编码："+PostalCode;
document.getElementById("td5").innerText="电话："+Phone;
document.getElementById("td6").innerText="传真："+Fax;
//获得鼠标的X轴的坐标
x = event.clientX + document.body.scrollLeft;
//获得鼠标的Y轴的坐标
y = event.clientY + document.body.scrollTop + 20;
//显示弹出窗体
Popup.style.display="block";
//设置窗体的X,Y轴的坐标
Popup.style.left = x;
Popup.style.top = y;
}
//隐藏弹出窗体
function Hide()
{
//隐藏窗体
Popup.style.display="none";
}
</script>
3． ToolTip窗体的代码
<div id="Popup" class="transparent" style=" Z-INDEX: 200">
<table border="0" cellpadding="0" style="FONT-SIZE: x-small">
<tr>
<td align="middle" bgcolor="indianred"><font color="white">联系方式</font></td>
</tr>
<tr><td id="td1"></td></tr>
<tr><td id="td2"></td></tr>
<tr><td id="td3"></td></tr>
<tr><td id="td4"></td></tr>
<tr><td id="td5"></td></tr>
<tr><td id="td6"></td></tr>
</table>
</div>
后台：
private DataTable dt;
private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
if(!IsPostBack)
{
SqlConnection cnn = new SqlConnection();
cnn.ConnectionString = "data source=localhost;initial catalog=Northwind;password=;"
+"persist security info=True;user id=sa;workstation id=APJ062;packet size=4096";
string sqlstr = "select Top 16 CustomerID, CompanyName, ContactTitle,Country, City, Address,PostalCode,Phone,Fax from Customers";
cnn.Open();
SqlDataAdapter ad = new SqlDataAdapter(sqlstr,cnn);
dt = new DataTable();
ad.Fill(dt);
grdCustomer.DataSource = dt;
grdCustomer.DataBind();
}
}
private void grdCustomer_ItemDataBound(object sender,
System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if(e.Item.ItemType == ListItemType.AlternatingItem
|| e.Item.ItemType == ListItemType.Item)
{
e.Item.Attributes.Add("onmouseover",
"this.oldcolor=this.style.backgroundColor;this.style.backgroundColor='#C8F7FF';");
e.Item.Attributes.Add("onmousemove",
"Show('"+dt.Rows[e.Item.ItemIndex]["country"].ToString()+"','"
+dt.Rows[e.Item.ItemIndex]["City"].ToString()+"','"
+dt.Rows[e.Item.ItemIndex]["Address"].ToString()+"','"
+dt.Rows[e.Item.ItemIndex]["PostalCode"].ToString()+"','"
+dt.Rows[e.Item.ItemIndex]["Phone"].ToString()+"','"
+dt.Rows[e.Item.ItemIndex]["Fax"].ToString()+"');");
e.Item.Attributes.Add("onmouseout",
"this.style.backgroundColor=this.oldcolor;Hide();");
}
}