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I am building a complex UI using twitter bootstrap and Knockout.js. To achieve this I have broken my page into a number of different logical components.
Is it okay to define a view model for each component and bind it by id , using
ko.applyBindings(myViewModel, document.getElementById('someElementId'))
rather then defining a single view model and binding the entire page to that?Does it have any performance issues?
It is fine to bind in this manner and it will not have worse performance.
When you are binding your subsections, you would want to make sure that you are not applying bindings to the same area more than once. This can happen if you apply bindings to a parent element and then to a child.
If you need to do that (bind individual sections, but also an overall view model), then you would want to do something like this: http://www.knockmeout.net/2012/05/quick-tip-skip-binding.html