JavaScript / ASP.NET Question (This is a good one)

[Jeff Voigt]

I just need a few pointers from a few experts to help me finish this up.

In a nutshell I want to return the user to where they left off on a page
througout numerous postbacks. So far, and with little implementation I have
the following:

Public Class BasePage

Inherits System.Web.UI.Page



Private Sub BasePage_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles MyBase.Load

' get out if this is not a post back

If Not Page.IsPostBack Then Return

' get the object name that caused a post back

Dim objectName As String = CType(Request.Form("__EVENTTARGET"),
String)

' get out if the name is nothing

If objectName Is Nothing Then Return

If objectName.Length = 0 Then Return

' register a script to scroll back to this location when returning

RegisterStartupScript("scroll", "<script
language=javascript>document.forms[0]." + objectName +
".scrollIntoView();</script>")

End Sub



End Class


This works great if the user selects a dropdown item when the dropdown has
it's AutoPostback property set to True. Since all of my web pages are
derived from the BasePage this will work beautifully. There is one problem
however in that the __EVENTTARGET will not always refer to the object that
caused the postback. I need this in order for the object.scrollIntoView
java script to fire off.

I've gotten numerous tips as to how I can change it. The one I like best is
to have some kind of hidden fields that track the top/left x/y coordinate of
the window and store that in some hidden fields so on a post back I can
retrieve the values and then call a window.ScrollTo( x,y ) function rather
than relying on the object that caused the post back.

My question now would be, what javascript can I use to constantly store and
x,y coordinate into some hidden fields? I know how to add controls to the
page and get values out. I just need to know if there is a way I can get
the x,y values back from the page on a post back via (storing them in hidden
fields) or something else (if anyone has a better idea).

If this does not make sense, or someone knows a better way to achieve this
please let me know. I would really appreciate the constructive criticism.

Thanks,
- J

[John Saunders]

Jeff, you might want to make your subject a bit more specific. I almost
didn't read your post until I recognized your name.

Something like "Trying to Replace SmartNavigation With Custom JavaScript"
might be more interesting to more readers.
--
John Saunders
Internet Engineer
[email]john.saunders@surfcontrol.com[/email]

[Jeff Voigt]

I'll do that now :)

"Jeff Voigt" <jeffrey.voigt@djj.state.fl.us> wrote in message
news:#gcnlUeXDHA.1640@TK2MSFTNGP10.phx.gbl...

> I just need a few pointers from a few experts to help me finish this up.
>
> In a nutshell I want to return the user to where they left off on a page
> througout numerous postbacks. So far, and with little implementation I

have

> the following:
>
> Public Class BasePage
>
> Inherits System.Web.UI.Page
>
>
>
> Private Sub BasePage_Load(ByVal sender As Object, ByVal e As
> System.EventArgs) Handles MyBase.Load
>
> ' get out if this is not a post back
>
> If Not Page.IsPostBack Then Return
>
> ' get the object name that caused a post back
>
> Dim objectName As String = CType(Request.Form("__EVENTTARGET"),
> String)
>
> ' get out if the name is nothing
>
> If objectName Is Nothing Then Return
>
> If objectName.Length = 0 Then Return
>
> ' register a script to scroll back to this location when returning
>
> RegisterStartupScript("scroll", "<script
> language=javascript>document.forms[0]." + objectName +
> ".scrollIntoView();</script>")
>
> End Sub
>
>
>
> End Class
>
>
> This works great if the user selects a dropdown item when the dropdown has
> it's AutoPostback property set to True. Since all of my web pages are
> derived from the BasePage this will work beautifully. There is one

problem

> however in that the __EVENTTARGET will not always refer to the object that
> caused the postback. I need this in order for the object.scrollIntoView
> java script to fire off.
>
> I've gotten numerous tips as to how I can change it. The one I like best

is

> to have some kind of hidden fields that track the top/left x/y coordinate

of

> the window and store that in some hidden fields so on a post back I can
> retrieve the values and then call a window.ScrollTo( x,y ) function rather
> than relying on the object that caused the post back.
>
> My question now would be, what javascript can I use to constantly store

and

> x,y coordinate into some hidden fields? I know how to add controls to the
> page and get values out. I just need to know if there is a way I can get
> the x,y values back from the page on a post back via (storing them in

hidden

> fields) or something else (if anyone has a better idea).
>
> If this does not make sense, or someone knows a better way to achieve this
> please let me know. I would really appreciate the constructive criticism.
>
> Thanks,
> - J
>
>
>