I've ended up doing this:
First of all, I have added a route called '/loading'; when
locationChangeSuccess detects the condition, it saves the path being
accessed and redirects to /loading:
else if (!nextRoute.access.isPublic) {
// redirect to login form
if (this.authStatus === 'loading') {
this.loadingPath = nextRoutePath
$location.path('/loading')
} else if (this.authStatus != 'seemsLoggedIn')
This view simply displays a 'loading' logo to the user, while waiting for
the XHR to complete. To detect the completion and switch back to target
view that the user intended to see I $broadcast an event when the status is
fetched:
$http.post(url, data).success(function(data, status) {
self.authStatus = data.authStatus
$rootScope.$broadcast('APP_STATE')
})
In the top-level controller of my SPA, I react to this event by restoring
the original view that the user wanted to see:
$scope.$on('APP_STATE', function() {
var targetPath = appState.loadingPath
if (targetPath != null) {
appState.loadingPath = null
$location.path(targetPath)
}
});
I am not sure this is the most elegant solution, but in any case it works
and also prevents excessive "flicker" of the screen while switching from
one view to another.
On Friday, 28 March 2014 20:16:35 UTC, Alexandros Karypidis wrote:
>
> Hi,
>
> I find myself in this predicament:
>
> The short version of the question is "is it possible to pause execution
> until an XHR completes" ?
>
> My app has a service that tracks the user status. When it loads, the
> service issues a $http call to the server, to fetch the status (logged in
> if a session exists, not logged in otherwise. Something like (simplified)
> this:
>
> var appstateSvc = {
> authStatus: null,
>
> refreshAuthStatus: function() {
> //...
> $http.post(url, data).success(function(data, status) {
> //...
> self.authStatus = data.authStatus
> })
> },
>
> I also have a locationChangeSuccess handler registered which verifies the
> user is logged in when arriving at a location. It inject the above service
> and in cases where the target location would be "log-in" only I redirect to
> a login view:
>
> else if (!nextRoute.access.isPublic) {
> // redirect to login form
> if (this.authStatus != 'seemsLoggedIn')
> this.interceptForLogin(nextRoutePath);
>
>
> This works fine for the most part, but has the following problem:
>
> 1. Assume I am logged in looking at my SPA
> 2. I close the browser tab
> 3. I open a new tab before session times out (still logged in)
> 4. I select a bookmark to some location that requires log in
>
> What happens at this point is that the $http call has not returned yet and
> the status is "loading". However, my location change handler gets called
> and redirects to the login page. How can I prevent this from happening?
>
> else if (!nextRoute.access.isPublic) {
> // redirect to login form
> if (this.authStatus === 'loading') {
> // HERE what can I do?
> // I know XHR is in progres and need to wait for
> // respones...
> } else if (this.authStatus != 'seemsLoggedIn')
> ...
>
> Thank you!
>
>
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