Color Dialog

[WhoopDing]

How do I display a Color Dialog in the client browser?

I want the Color Dialog to be displayed when the user clicks a button.

 

[Scott Allen]

There is a color dialog control in Win32, but if you want a 100% web
based solution you'll need to roll your own, or build on top of
existing work:
http://www.google.com/search?hl=en&lr=&c2coff=1&q=asp.net+client+side+color+picker

 

[WhoopDing]

Sorry, maybe I should be a bit more specific.

I am new to .Net. So, my query is no doubt a simple one.

I have the folowing code in the WebForm:
Imports System.Windows.Forms.ColorDialog

....

Private ColorDialog As New Windows.Forms.ColorDialog

The problem I get is I get an error when the button that opens then
ColorDialog is clicked.

This is the error:

It is invalid to show a modal dialog or form when the application is not
running in UserInteractive mode. Specify the ServiceNotification or
DefaultDesktopOnly style to display a notification from a service
application.

The code in the Button Click EventHnadler is:

Private Sub cmdColor_Click(ByVal sender As Object, ByVal e As
System.EventArgs) Handles cmdColor.Click

ColorDialog.ShowDialog()

If ColorDialog.ShowDialog = Windows.Forms.DialogResult.OK Then

pnlColor.BackColor = ColorDialog.Color

End If

End Sub

 

[Scott Allen]

Yes, WhoopDing - this is what I was trying to point out.

In ASP.NET development you can't use classes from System.Windows.Forms
to pop up dialogs and such on a user's screen.

The client's web browser makes a request to your application, and your
application should respond with HTML and JavaScript that the browser
can interpret and display. The code you are working with executes on
the server - you don't want to pop up a dialog on the web server.

Hope this is making some sense,

 

[WhoopDing]

OK, I have that. How, then, do I cause the browser to open a dialog box
where the user can select a color?

Forgive my newness!

Thanks

 

[WhoopDing]

That's what I want.

Thanks for your help (sorry to be a pest).

 

[Scott Allen]

What I would do is look at some of the color picker controls people
have built, there are a few on this page:

http://asp.net/ControlGallery/default.aspx?Category=7&tabindex=2

Depending on how you want the user to interact with the control and
how many colors it displays, etc, etc you might chose to use one or
take the source code from an existing control and tweak it.