Reminder when you select Delete in the checkbox column of the DataGrid

// Delete the reminder
Function alertmessage (f)
{
// F = Document. form1
VaR flag = false;
For (VAR I = 0; I <F. length; I ++)
{
VaR E = f. elements [I];
If (E. type = "checkbox ")
{
If (E. Checked)
{
Flag = true;
}
}
}
// Determine whether the selected record is selected first
If (flag = false)
{

Window. Alert ("select the record to delete! ");
Return false;
}
Else
{
// Pre-deletion reminder
Return confirm ('Are you sure you want to delete the selected record? This operation cannot be recovered! ');
}
}

Add this. btndel. Attributes. Add ("onclick", "javascript: Return alertmessage (document. form1);") to the delete button );");

The result is as follows: