How to accomplish “two-way binding” with URL pseudo params?

[slisznia]

http://stackoverflow.com/questions/27263191/pagerjs-how-to-accomplish-two-way-binding-with-url-pseudo-params

[hagabaka]

Somewhat related to this question, is it possible to bind a parameter value to an observable in the root viewModel? The documentation says "If the parameter already exists on the viewModel it is bound to that observable instead", but this seems to only apply for the viewModel which is the Page's ctx.

If the answer to my question is yes, then you can just listen to hashchange event and update the corresponding observable. Otherwise, you would need to update it in page.activePage$().ctx instead.