Depending on the size of the tree you could 'clear' the tree (remove
children) and simply build it again (and with the new DynAPI
being pretty close to memory-leak free this is a viable solution). This
method has the nifty benefit of not having to embed 'tree-update' logic in
the server side produces javascript. In essence, your server side
javascript would do only ONE thing EVERY time...which is a perfect task for
a server-side script.
Thoughts, comments welcome
3V3
----- Original Message -----
From: "Scott Smith" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, May 10, 2001 11:18 AM
Subject: RE: [Dynapi-Help] Populating a tree from a database
> Let's say we want to refresh a branch of the tree from the database each
> time it is opened. I guess the JavaScript that gets dynamically generated
> would also have to contain code to respond to 'expand' events so that it
> could:
>
> * query the database
> * generate JavaScript that:
> * refreshes the tree
> * run the newly generated JavaScript
>
> There may be many users using the system, so the script that is generated
> will have a file name based on a session id (or something like that), so
the
> name of the script to run is itself dynamically determined.
>
>
> This gets pretty complicated.
>
> Scott
>
> > -----Original Message-----
> > From: Chris Shreve [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, May 10, 2001 1:32 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: [Dynapi-Help] Populating a tree from a database
> >
> >
> > Yes. It's completely possible. As a matter of fact this is
> > exactly what my
> > current web app does. Here is an outline of the 'trick'
> >
> > <html>
> > <head>
> > <script language="javascript">
> > items = new Array()
> > </script>
> > <script language="javascript"
> > src="name_of_servlet/php/asp/jsp_that_produces_javascript_that
> > _adds_items
> > from_database_to_items_array"></script>
> > <script language="javascript src="../src/dynapi.js"></script>
> > <script language="javascript">
> > theme = "../coreImages/themes/enlightenment/"
> > document.write('<script language="Javascript"
> > src="'+theme+'style.js"><'+'/'+'script>')
> > </script>
> > <script language="javascript">
> > DynAPI.setLibraryPath('/admin/viewbuilder/dynapi/src/lib/')
> > DynAPI.include('dynapi.api.*')
> > DynAPI.include('dynapi.event.*')
> > DynAPI.include('dynapi.ckslib.coreskintree')
> >
> > DynAPI.onLoad = function() {
> > var aTree = new CoreSkinTree(30,30,200,'Database Tree',theme)
> > for (var i=0;i<items.length;i++)
> > var itm = items[i]
> > aTree.add(itm.name)
> > }
> > DynAPI.addChild(aTree)
> > }
> > </script>
> > </head>
> > <body>
> > </body>
> > </html>
> >
> > The real 'trick' is to include an javascript file that is dynamically
> > generated by some server process that has access to your
> > database and loads
> > info into the javascript items array (or even complex
> > javascript objects
> > which are then added to the items array). Again, the
> > important thing to
> > remember is that the server process MUST PRODUCE VALID
> > JAVASCRIPT. That's
> > it.
> >
> >
> > Hope this helps
> >
> > 3V3
> >
> >
> >
> > ----- Original Message -----
> > From: "Scott Smith" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Thursday, May 10, 2001 9:33 AM
> > Subject: [Dynapi-Help] Populating a tree from a database
> >
> >
> > > I'm a virgin (as far as DynAPI in concerned) so be gentle.
> > >
> > > Is there a way to populate a tree control from a database?
> > Is it possible
> > > to dynamically update the data in the tree control?
> > >
> > > Are there any examples that show how this is done.
> > >
> > > BTW - We plan on using Turbine & Velocity (both open
> > source) to create our
> > > web application framework.
> > >
> > > Thanks,
> > >
> > > Scott
> > >
> > > _______________________________________________
> > > Dynapi-Help mailing list
> > > [EMAIL PROTECTED]
> > > http://lists.sourceforge.net/lists/listinfo/dynapi-help
> > >
> >
> >
> > _______________________________________________
> > Dynapi-Help mailing list
> > [EMAIL PROTECTED]
> > http://lists.sourceforge.net/lists/listinfo/dynapi-help
> >
>
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