[javascript]Validate Gridview Footer Checkbox - asp.net

Question

[Asp.net / Vb.Net]
How can I validate my gridview footer checkbox using Javascript.
I have a gridview with footer having 8 checkboxes -(chkActive1,chkActive2,.....chkActive3) -
The condition I want to jave is - The user need to check atleast 1 checkbox or else the trasaction would not allow
thanks..

Answer 1

so simple, every check box have unique id check in view source there is some patent in name in controls when you check viewsource of that page, just use that, its simple way.

Answer 2

If I misunderstood you then please correct me, I think this could be done via using a custom validator in asp.net
Since you haven't mentioned I am assuming you are using CheckBoxList Control.
On .aspx page use custom validator
<asp:CustomValidator ID="customValidatorForCheckboxlist" runat="server"
ErrorMessage="Required Field" ValidationGroup="valSurvey"
OnServerValidate="CheckifCheckBoxIsEmpty" SetFocusOnError="true" Display="Dynamic"></asp:CustomValidator>
On codebhind using this logic to iterate through your gridview row and check for footer row. Inside footer row iterate through all checkboxes and then see if they are selected or not. I am using a boolean field to check if anything was selected. Jump out if anything is selected.
Protected Sub CheckifCheckBoxIsEmpty(ByVal sender As Object, ByVal e As ServerValidateEventArgs)
Dim valbool As Boolean = False
For Each gvrow As GridViewRow In gridview_1.Rows
'Check for footer row.
If gvrow.RowType = DataControlRowType.Footer
For Each ct As Control In gvrow.Cells(1).Controls
If ct.GetType.ToString().Equals("System.Web.UI.WebControls.CheckBoxList") Then
Dim _checkboxlist As CheckBoxList = DirectCast(ct, CheckBoxList)
For Each ListItem1 As ListItem In _checkboxlist.Items
If ListItem1.Selected = True Then
valbool = True
Exit For
Else
valbool = False
End If
Next
End If
Next
End If
Next
If valbool = False Then
e.IsValid = False
Else
e.IsValid = True
End If
End Sub