[734] Warning before exiting company page

[shreydesai]

Referenced Issue

Fixes #734

Description

If you click a link and there is information in the company page, this will pop up:

If you click the back/forward/refresh button or try to close the tab when there is information in the company page, this will pop up:

Important notes:

• I could only style the alert box when clicking on links because clicking on links has its own designated event. Therefore, this event can be exploited to have a custom popup.
• The rest of the events, i.e. clicking the back/forward/refresh or closing the tab, do not have a designated event but are rather bunched up into onbeforeunload, which cannot be overridden by custom styles. Any "hack" would either 1) not work as expected or 2) not be universally accepted across all browsers because it's not officially supported.

[wogsland]

If I click okay on the modal I get the alert as well:

Which seems a little weird to me.