No, there isn't. A big part of the idea of Backbone is to provide some support for large web apps without dictating anything about your HTML or CSS for you -- there are already a large number of frameworks that give you widgets, and I'd suggest looking at one of those.
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Is there a mobile widget library for backbone.js?
No, there isn't. A big part of the idea of Backbone is to provide some support for large web apps without dictating anything about your HTML or CSS for you -- there are already a large number of frameworks that give you widgets, and I'd suggest looking at one of those.
Why not plug in jquery mobile or some other mobile framework?
Because jqmobile doesn't provide an mvc like framework.
There should not really be a problem with using Backbone.js and jQuery Mobile together.
Sounds strange to me. How does jQueryMobile pages relate to Backbone.js views? Do you have an example?