Winjs binding converters

Skip to content. Star 4. New issue. Jump to bottom. Binding: binding converter not called for 'undefined' values? Labels feature: binding. Milestone Copy link. Its defined as WinJS. Data ; WinJS. Contributor Author. Binding: binding initializer not called for 'undefined' values? May 6, Oh, this is indeed a bug, great catch :! BoundInput as a control that does just that.

You can try the following snippets out on the Try Site Playground. That looks quite interesting. I'll have to keep that in mind.

I have a few places where I would need to listen to the change-events of lists which would be a better way to fire off certain functions. Performance hits? Other bugs I might invoke? Yes, the major downside to the workaround of calling WinJS.

Here's an experiment you can do to see this:. To avoid this, you can use a different technique for getting the bindings to update. Instead of calling WinJS. Whenever you edit your WinJS. List , you can call it like this assuming context is your data context and myArray is your Binding. List :. As I stated in an earlier post, data contexts should only contain data. The reason is that this will not be bound to the expected object within the method.

It'll be bound to the observable version of the object rather than the original object. This is especially problematic when the original object has non-enumerable properties because those are ignored by Binding. It looks like it is okay to put a Binding. List in your data context. It is an exception to the rule of avoiding behavior in the data context.

This is because it manually implements support for data binding by mixing in the observableMixin. Could you modify the simpleView accordingly? Anytime your Binding. List is modified, the data context which references it needs to be notified of the change. Anytime you create a data context which references a Binding.

List , you can register for the Binding. List 's modification events itemchanged, iteminserted, etc. See the Declarative Binding sample for an example of a conversion function that does not use the converter method.

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