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Enable button with a checkbox VB

Posted on 2008-06-17
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2,137 Views
Last Modified: 2010-04-21
i am using VB Script. i have a check box and a disabled button. i wish to enable button when checkbox is checked and disable button when checkbox is unchecked. Here is the code I have so far:

Default.aspx
<asp:CheckBox ID="CBFlights" runat="server" Text="Flights" value="ON" onclick="enbutton()"/>
<asp:Button ID="BNFlight" runat="server" Text="Flights" Width="74px"  Enabled="False" />

Default.aspx.vb
Sub enbutton()
        If CBFlights.Checked = True Then
            BNFlight.Enabled = True
        Else
            BNFlight.Enabled = False
        End If
    End Sub

Can anyone help here - not sure what I am doing wrong :(
Thanks
0
Comment
Question by:Phesant123
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4 Comments
 
LVL 43

Expert Comment

by:TimCottee
ID: 21801669
Hello Phesant123,

Firstly what you really want to be doing is to do this on the client-side and not on the server-side. For a simple task like this there is really no need to make a round-trip to the server.

Use the following code (assuming you are using framework 2.0 or higher, let me know if you would prefer a 1.0/1.1 version).

<asp:CheckBox ID="CBFlights" runat="server" Text="Flights" value="ON" onclientclick="document.getElementById('<%=BNFlight.ClientID()%>').disabled=!this.checked;"/>
<asp:Button ID="BNFlight" runat="server" Text="Flights" Width="74px"  Enabled="False" />

I know this is a javascript version but it is much simpler than writing a seperate function when it is not really necessary.

Regards,

TimCottee
0
 
LVL 1

Author Comment

by:Phesant123
ID: 21801721
Hi TimCottee

Thanks for your speedy reply - thats exactly what I require above but I have entered the code above:

<asp:CheckBox ID="CBFlights" runat="server" Text="Flights" value="ON" onclientclick="document.getElementById('<%=BNFlight.ClientID()%>').disabled=!this.checked;"/>
 <asp:Button ID="BNFlight" runat="server" Text="Flights" Width="74px"  Enabled="False" />

The button remains blanked out when I click in the checkbox - any ideas?
Thanks
0
 
LVL 43

Accepted Solution

by:
TimCottee earned 500 total points
ID: 21801983
Phesant123,

Seems that the checkbox for some reason doesn't have the OnClientClick attribute, you will have to do it the other way:

            CBFlights.Attributes.Add("onclick", String.Format("document.getElementById('{0}').disabled=!this.checked;",BNFlight.ClientId))

Put this in your page_load event

TimCottee
0
 
LVL 1

Author Closing Comment

by:Phesant123
ID: 31467908
Thanks TimCottee
That works perfect
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