Question

changing image on update panel using a timer (blinking)

Asked by: adimit

Hello

I have a timer attached to an update panel. In one instance I want to perform a blink type function on an image:
example
if image1.imageurl = "red.jpg" then imageurl ="black.jpg" esle image1.imageurl = "red.jpg"

my problem is that the first time the timer executes it changes the image to black.jpg, but each time the timer runs image1.imageurl is always equal to red.jpg even though it is visually black.jpg. What am I doing wrong?

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Asked On
2009-10-05 at 09:31:13ID24786017
Tags

asp.net

,

vb

,

visual studio .net 2008

Topics

Programming for ASP.NET

,

Visual Studio

Participating Experts
1
Points
380
Comments
16

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Answers

 

by: Omego2KPosted on 2009-10-05 at 10:54:51ID: 25497638

code please

 

by: adimitPosted on 2009-10-05 at 11:36:00ID: 25498133

If fifoValues(tempInt) = True Then
                            If myControl.imageurl = formula.greenInterlockImage Or myControl.imageurl = formula.redInterlockImage Then
                                myControl.imageurl = formula.blinkInterlockImage
                            Else
                                If ilkValues(tempInt) = False Then
                                    myControl.imageurl = formula.greenInterlockImage
                                Else
                                    myControl.imageurl = formula.redInterlockImage
                                End If
                            End If
                        End If

 

by: Omego2KPosted on 2009-10-05 at 11:42:25ID: 25498203

um, is that changing image inside the update panel? Can I see the aspx code?

 

by: adimitPosted on 2009-10-05 at 12:10:32ID: 25498491

it is inside the update panel. It is changed by a timer. The aspx code is huge.

 

by: Omego2KPosted on 2009-10-05 at 12:20:40ID: 25498594

myControl I am guessing is the image? is it of type Image?

 

by: adimitPosted on 2009-10-05 at 12:42:40ID: 25498837

below is the emtire for loop. Mycontrol is of type image when evaluated (verified through breakpoints)
 For Each myControl In UpdatePanel761.ContentTemplateContainer.Controls
                    If valid.eliminateNullString(myControl.id).ToUpper.Trim = (interlockObjects(x).ID).ToUpper Then
                        '-------------------------------------------------------------
                        codePointer = "Set Interlock Object properties"
                        '-------------------------------------------------------------                      
                        myControl.ToolTip = interlockObjects(x).ToolTip
                        'find correspondig interlockbit for x
                        tempStr = valid.eliminateNullString(formula.interlockOrder(Session("IntType"), x))
                        If tempstr.Length = 0 Then Exit For
                        tempInt = tempStr.IndexOf(".", 0)
                        tempInt = tempStr.IndexOf(".", tempInt + 1)
                        tempStr = tempStr.Substring(tempInt + 1)
                        '-------------------------------------------------------------
                        codePointer = "Set Interlock Object properties - Determining interlock bitname to animante"
                        '-------------------------------------------------------------
                        tempInt = tempStr
                        If ilkValues(tempInt) = False Then
                            myControl.imageurl = formula.greenInterlockImage
                            'myControl.tooltip = valid.eliminateNullString(formula.interlockOrder(Session("IntType"), tempInt))
                        Else
                            myControl.imageurl = formula.redInterlockImage
                            'myControl.tooltip = valid.eliminateNullString(formula.interlockOrder(Session("IntType"), tempInt))
                        End If

                        '-------------------------------------------------------------------------------------------
                        codePointer = "Set Interlock Object properties - Animate Fifo (blinking)"
                        '--------------------------------------------------------------------------------------------
                        If fifoValues(tempInt) = True Then
                            If myControl.imageurl = formula.greenInterlockImage Or myControl.imageurl = formula.redInterlockImage Then
                                myControl.imageurl = formula.blinkInterlockImage
                            Else
                                If ilkValues(tempInt) = False Then
                                    myControl.imageurl = formula.greenInterlockImage
                                Else
                                    myControl.imageurl = formula.redInterlockImage
                                End If
                            End If
                        End If
                        myControl.visible = True
                        Count = Count + 1
                    End If
                    If valid.eliminateNullString(myControl.id).ToUpper.Trim = (labelObjects(x).ID).ToUpper Then
                        '-------------------------------------------------------------------------------
                        codePointer = "Set Label properties"
                        '-------------------------------------------------------------------------------
                        myControl.Text = labelObjects(x).Text
                        myControl.ForeColor = labelObjects(x).ForeColor
                        myControl.visible = True
                        Count = Count + 1
                    End If
                    If valid.eliminateNullString(myControl.id).ToUpper.Trim = (labelNumObjects(x).ID).ToUpper Then
                        '-------------------------------------------------------------------------------
                        codePointer = "Set Label num properties"
                        '-------------------------------------------------------------------------------
                        myControl.Text = labelNumObjects(x).Text
                        myControl.ForeColor = labelNumObjects(x).ForeColor
                        myControl.visible = True
                        Count = Count + 1
                    End If
                    If Count = 3 Then Exit For
                Next
            Next x

 

by: Omego2KPosted on 2009-10-05 at 12:46:13ID: 25498885

to confirm that when you get to the code the image is always formula.blinkInterlockImage?

 

by: adimitPosted on 2009-10-05 at 13:01:26ID: 25499047

In the code it is always formula.redInterlockImage  when it should be formula.blinkinterlockimage. Visually it is formula.blinkinterlockimage. By code i mean if I place a breakpoint and see the imageurl property in a watch window it is always formula.redinterlockimage.

 

by: Omego2KPosted on 2009-10-05 at 13:10:28ID: 25499147

probably because the hidden viewstate field doesn't change, you're not posting back the entire thing, although I can't say for certain, maybe somebody else can

 

by: adimitPosted on 2009-10-05 at 13:22:23ID: 25499289

I enabled the viewstate property on the image, thinking that that might be the problem (I had originally disabled it). That didn't solve the problem. How do i make the view state field change?

 

by: Omego2KPosted on 2009-10-05 at 13:39:13ID: 25499474

Since the viewstate hidden field is outside the update panel it doesn't change, unless the update panel changes it, which I don't think it does.

 

by: adimitPosted on 2009-10-06 at 07:21:48ID: 25505326

how would i change the viewstate for a particular object?

 

by: Omego2KPosted on 2009-10-06 at 07:25:21ID: 25505371

what do you mean by that?

 

by: adimitPosted on 2009-10-06 at 07:33:30ID: 25505469

->Since the viewstate hidden field is outside the update panel it doesn't change, unless the update panel changes it, which I don't think it does

How does the update panel change the view state field? all code is being executed by a timer that updates the update panel

 

by: Omego2KPosted on 2009-10-06 at 07:52:46ID: 25505710

I am saying it doesn't change the rendered hidden field called _VIEWSTATE I believe that's the name, but in any event I am saying it doesn't, and ASP.NET looks at it each post back

 

by: adimitPosted on 2009-10-06 at 10:21:09ID: 25507442

I was hoping that there was a way to set the viewstate easily. But i guess there isn't. Anyway I came up with a workaround. I store the object info into an array as the info changes. Then at the ned of the loop I store the array contents in a session variable. See Below

interlockObjects = Session("interlockObjects") =
Select Case fifoValues(tempInt)
                            Case True
                                If interlockObjects(x).ImageUrl = formula.greenInterlockImage Or interlockObjects(x).ImageUrl = formula.redInterlockImage Then
                                    myControl.imageurl = formula.blinkInterlockImage
                                    interlockObjects(x) = myControl
                                Else
                                    If ilkValues(tempInt) = False Then
                                        myControl.imageurl = formula.greenInterlockImage
                                        interlockObjects(x) = myControl
                                    Else
                                        myControl.imageurl = formula.redInterlockImage
                                        interlockObjects(x) = myControl
                                    End If
                                End If
                            Case False
                                If ilkValues(tempInt) = False Then
                                    myControl.imageurl = formula.greenInterlockImage
                                    interlockObjects(x) = myControl
                                    'myControl.tooltip = valid.eliminateNullString(formula.interlockOrder(Session("IntType"), tempInt))
                                Else
                                    myControl.imageurl = formula.redInterlockImage
                                    interlockObjects(x) = myControl
                                    'myControl.tooltip = valid.eliminateNullString(formula.interlockOrder(Session("IntType"), tempInt))
                                End If
                        End Select
Session("interlockObjects") = interlockObjects


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