Understanding Navigation State
When building a multi-page app with the Navigation API, you can take advantage of Navigation state to preserve state as you navigate back and forth between pages. Each entry in history has a state property associated with it. You can assign whatever value that you want to this state property.
Imagine, for example, that you are building a simple product catalog. The app consists of only two pages: a home page, which displays a list of categories, and a details page, which displays a list of matching products (see Figures 12.7 and 12.8). When you click a category on the home page then you see a list of matching products on the details page.
FIGURE 12.7 The store app home page
FIGURE 12.8 The store app details page ...
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