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What did we just do?
In app.js, we mapped a URL to PhotoController and photo.html. We added a variable part named id to the URL, like this: /photos/:id.
In PhotoController, we used Angular's $routeParams to retrieve id from the URL by using $routeParams.id. Notice that we injected both $routeParams and the photos service into the PhotoController dependency array to make them available to use inside the controller.
Then to fetch an individual photo, we first used the photos service to fetch the array of photos from the server, and then used $routeParams.id to access the specific photo by its index.
As before, any properties attached to $scope become available to use in the view. This means in photo.html, we can display the photo's detail using expressions as done before.
Notice that when you click on links, the app doesn't do a full reload. Only the part of the view specified by <div ng-view></div> changes.
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