Demo of using dojo.Stateful API for MVC patterns and property-driven programming style

[cwiecha]

As discussed in dojo team meeting 6/23/2010, here's a demo showing the use of the new dojo.Stateful APIs in 1.5 as applied to an image resize dialog. The demo is packaged according to Dustin's template at ​http://github.com/dmachi/DemoExample and has been checked into github as well at ​http://github.com/cwiecha/DemoImageResize

Adding here as requested IIRC...Thanks, Charlie Wiecha

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from the package README:

Quick demo showing the use of dojo.Stateful APIs for derived values in a data model,and binding between model and form dijits in the view. The goal is to show a simple means to conform to MVC patterns in UI design and also to emulate constraint-based "derived" values in the data model using an image resize dialog.

Try changing either the absolute or relative image sizes and observe the effects on the derived values. Changes can be made in either direction (absolute->relative or vice versa), and also with the aspect ratio pegged or not.

While the demo does not actually implement a constraint-based dependency graph between the values, the dojo.Stateful API along with simple checks to detect and break cycles are sufficient to get pretty close...

The dojo.Stateful watch() fn is used both in the model for derived values and to watch changes on both sides of the Model-View split to resync values as they change in either place. Check out layer.js for details...

[James Burke]

I think dmachi said he would look at this.

[bill]

1.5 is released, moving remaining tickets to 1.6

[bill]

(sadly) punting seemingly abandoned ticket and meta tickets to future

[dylan]

We would love to revisit this and add to the demos site, if there's interest in revisiting this.

[trac-o-bot]

Because we get so many tickets, we often need to return them to the initial reporter for more information. If that person does not reply within 14 days, the ticket will automatically be closed, and that has happened in this case. If you still are interested in pursuing this issue, feel free to add a comment with the requested information and we will be happy to reopen the ticket if it is still valid. Thanks!