I created a public application based variable not within any procedure,
like so:
Partial Class lobbytimes_lobb ytimes
Inherits System.Web.UI.P age
Public BackgroundImage As String
Protected Sub Page_Load(ByVal ..)
I then created a background image randomizer subroutine and placed that
into 'If not Page.IsPostback ' decision on the page load routine, like so:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArg s) Handles Me.Load
If Not Page.IsPostBack Then
LoadBackground( )
End If
End Sub
And here's the LoadBackground routine:
Sub LoadBackground( )
Randomize()
Dim imagegen(2) As String
Dim x As Short
x = CShort(Rnd() * 2)
imagegen(0) = "../lobbytimes/backgrounds/a1.gif"
imagegen(1) = "../lobbytimes/backgrounds/a2.gif"
imagegen(2) = "../lobbytimes/backgrounds/1.jpg"
BackgroundImage = imagegen(x)
End Sub
And on the aspx page, I put this:
<body background="<%R esponse.write(B ackgroundImage) %>">
So, the problem is that when the page first loads, the random background
image loads fine. But, on any postback event (which there are several on
this application), the background image disappears and all that's left
is a white background (nothing).
Sure, I could place the LoadBackground routine under the Page_Load Sub,
but it would be annoying to see the background change 100 times a day.
I wanted the random image to load once and stay there while they used
the application.
Any ideas?
TIA,
Jim
1  1435 
At the end of your LoadBackground function you should store the chosen
background value somewhere to persist it between postbacks.
Perhaps ViewState would be a good place. Alternately you might consider
Session state or perhaps a cookie.
Then in your Page_Load event you'd have code similar to this:
If Page.IsPostback () Then
'Load from ViewState
Else
'call LoadBackground function
End If
--
I hope this helps,
Steve C. Orr,
MCSD, MVP, CSM, ASPInsider http://SteveOrr.net
"Jim in Arizona" <ti*******@hotm ail.comwrote in message
news:%2******** *******@TK2MSFT NGP06.phx.gbl.. .
>I created a public application based variable not within any procedure,
like so:
Partial Class lobbytimes_lobb ytimes
Inherits System.Web.UI.P age
Public BackgroundImage As String
Protected Sub Page_Load(ByVal ..)
I then created a background image randomizer subroutine and placed that
into 'If not Page.IsPostback ' decision on the page load routine, like so:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArg s) Handles Me.Load
If Not Page.IsPostBack Then
LoadBackground( )
End If
End Sub
And here's the LoadBackground routine:
Sub LoadBackground( )
Randomize()
Dim imagegen(2) As String
Dim x As Short
x = CShort(Rnd() * 2)
imagegen(0) = "../lobbytimes/backgrounds/a1.gif"
imagegen(1) = "../lobbytimes/backgrounds/a2.gif"
imagegen(2) = "../lobbytimes/backgrounds/1.jpg"
BackgroundImage = imagegen(x)
End Sub
And on the aspx page, I put this:
<body background="<%R esponse.write(B ackgroundImage) %>">
So, the problem is that when the page first loads, the random background
image loads fine. But, on any postback event (which there are several on
this application), the background image disappears and all that's left is
a white background (nothing).
Sure, I could place the LoadBackground routine under the Page_Load Sub,
but it would be annoying to see the background change 100 times a day.
I wanted the random image to load once and stay there while they used the
application.
Any ideas?
TIA,
Jim
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