asked on Gridview Checkbox Select
I have a grid view that contains postcodes.
I want to be able to enable a use to select 2 postcodes(only) from the list to set as an a and b address.
I can select a row and access the postcode field no problems but i need to do the following.
Only allow the users to select 2 postcodes. One for A address and one for B address.
Once selected I would like to save as maybe a session variable so that I can pass to google maps which works out the distance between A and B.
I want to be able to enable a use to select 2 postcodes(only) from the list to set as an a and b address.
I can select a row and access the postcode field no problems but i need to do the following.
Only allow the users to select 2 postcodes. One for A address and one for B address.
Once selected I would like to save as maybe a session variable so that I can pass to google maps which works out the distance between A and B.
ASP.NET.NET Programming
Last Comment
Ryan Chong
can you illustrate and show how's your gridview layout looks like?
ASKER
<asp:GridView ID="gvAppointments" runat="server" AutoGenerateColumns="False" DataKeyNames="IGSaleID,AppointmentPostcode" DataSourceID="dsAppointmentsbyDate">
<Columns>
<asp:BoundField DataField="IGSaleID" HeaderText="IGSaleID" InsertVisible="False" ReadOnly="True" SortExpression="IGSaleID" />
<asp:BoundField DataField="SaleID" HeaderText="SaleID" SortExpression="SaleID" />
<asp:BoundField DataField="DateAdded" HeaderText="DateAdded" SortExpression="DateAdded" />
<asp:BoundField DataField="AppointmentStartTime" HeaderText="AppointmentStartTime" SortExpression="AppointmentStartTime" />
<asp:BoundField DataField="AppointmentEndTime" HeaderText="AppointmentEndTime" SortExpression="AppointmentEndTime" />
<asp:BoundField DataField="HomePostCode" HeaderText="HomePostCode" SortExpression="HomePostCode" />
<asp:BoundField DataField="AppointmentPostcode" HeaderText="AppointmentPostcode" SortExpression="AppointmentPostcode" />
<asp:BoundField DataField="AppointmentSubject" HeaderText="AppointmentSubject" SortExpression="AppointmentSubject" />
<asp:TemplateField HeaderText="Compare Distance">
<ItemTemplate>
<asp:CheckBox ID="ckPostcode" runat="server" OnCheckedChanged="ckPostcode_CheckedChanged" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
you may do some verification like this:
you may also add the AutoPostBack tag in your checkbox to:
to:
protected void ckPostcode_CheckedChanged(object sender, EventArgs e)
{
List<String> selection = new List<string>();
int checkedCnt = 0;
foreach (GridViewRow row in gvAppointments.Rows)
{
CheckBox chk = (CheckBox)row.FindControl("ckPostcode");
if (chk.Checked)
{
//put IGSaleID into selection
selection.Add(row.Cells[0].Text);
checkedCnt++;
}
}
if (checkedCnt > 2)
{
Response.Write("Please select only 2 items");
}
else if (checkedCnt <=1)
{
Response.Write("Please select items for comparison");
}
}
you may also add the AutoPostBack tag in your checkbox to:
<asp:CheckBox ID="ckPostcode" runat="server" OnCheckedChanged="ckPostcode_CheckedChanged" />
to:
<asp:CheckBox ID="ckPostcode" AutoPostBack="true" runat="server" OnCheckedChanged="ckPostcode_CheckedChanged" />
ASKER
Thanks Ryan although I do have a problem with the postback clearing the checkbox selections.
ASKER
Just me being a tool, the post back thing is fine as I was data binding the grid-view on post back.
This now almost works as intended.
The only issue is that the checkboxes are disabled on only below the rows of the 2 ticked items
This now almost works as intended.
The only issue is that the checkboxes are disabled on only below the rows of the 2 ticked items
Protected Sub ckPostcode_CheckedChanged(sender As Object, e As EventArgs)
Dim selection As List(Of [String]) = New List(Of String)()
Dim checkedCnt As Integer = 0
For Each row As GridViewRow In gvAppointments.Rows
Dim chk As CheckBox = DirectCast(row.FindControl("ckPostcode"), CheckBox)
If chk.Checked Then
'put IGSaleID into selection
selection.Add(row.Cells(0).Text)
checkedCnt += 1
End If
If checkedCnt >= 2 Then
lbSelected.Text = "Too many items"
chk.Enabled = False
ElseIf checkedCnt <= 1 Then
lbSelected.Text = "the right amount"
chk.Enabled = True
End If
Next
End Sub
The only issue is that the checkboxes are disabled on only below the rows of the 2 ticked itemswell.... is that mean you want to disable other checkboxes after 2 items were checked?
and... is that mean the user cannot make changes to his/her selection?
ASKER
well.... is that mean you want to disable other checkboxes after 2 items were checked?
Yes
and... is that mean the user cannot make changes to his/her selection?
Yes.
Thanks
Yes
and... is that mean the user cannot make changes to his/her selection?
Yes.
Thanks
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ASKER
Thanks, that works so I'll give the points for that.
IS there a way I can set the 1st checked box as an ' A' and the send as ' b'. The reason why I want to do this is that I want the first checkbox selected to go into textbox1 and the 2nd checkbox selected to go into textbox 2. Thanks
IS there a way I can set the 1st checked box as an ' A' and the send as ' b'. The reason why I want to do this is that I want the first checkbox selected to go into textbox1 and the 2nd checkbox selected to go into textbox 2. Thanks
IS there a way I can set the 1st checked box as an ' A' and the send as ' b'. The reason why I want to do this is that I want the first checkbox selected to go into textbox1 and the 2nd checkbox selected to go into textbox 2is that mean you want to show "A" (or 1st selected checkbox's value ??) into first text box? and later do the same to show "B" (or 2nd selected checkbox's value ??) into 2nd text box?
any further comments before closing this question?
Suggested solution works
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