Utilizing the localStorage feature has proven to be effective in ensuring that when users log out in one tab, they are also logged out in other tabs.
- To achieve this, I bound to the
storage event on the window object and utilized the event.key/event.newValue keys to determine necessary actions. Additionally, monitoring the event.url key ensured that the storage event originated from the correct page. By setting a logged-out flag based on validated url, key, and newValue data, successful implementation was achieved.
- Another approach involved binding to the
focus event on the window object and automatically logging out the user if the logged-out flag was set to true.
In my scenario, initialization of the localStorage data as "not logged out" during page load was crucial. This step was essential as the storage event would not trigger unless there was an actual change in the value of the observed localStorage key. For instance, if the value remained as blah without any alteration, no event would occur.
Furthermore, this implementation remains compatible with IE 8 and onwards.
Regarding another use case, you could consider establishing a specific localStorage key/value upon user login and restricting page access if the key/value already exists. Incorporating a timestamp within the value could facilitate re-entry for users who haven't properly logged out after a designated time period. Implementing an interval mechanism to update the timestamp while the user is active could enhance this functionality.
This strategy remains untested, therefore, should you explore this avenue, I'd appreciate insights into your experience and any adjustments made to ensure its efficacy.