Warn user before leaving web page with unsaved changes
105684
How to show an alert when user navigates to another page without filling the form?
33657
Ability to change close reason before it gets closed
143847
Stop Notepad++ warning if file has been modified from outside
142766
How do I display a message after redirecting users from the logout page?
62437
How do I safely "eval" user code in a webpage?
15692
Is there a way to detect if a browser window is not currently active?
143087
How to force page not to be cached in PHP?
68954
How to prevent form resubmission when page is refreshed (F5 / CTRL+R)
143766
Clearpage without pagebreak?
91840
Force new users to go through animated tutorial before they post for the first time
15148
Prevent user from seeing previously visited secured page after logout
96139
How can I run some javascript after an update panel refreshes?
126194
How to maintain a file's 'last modified' date?
134091
Show error in new HTML element without page refresh
7072
How can I force clients to refresh JavaScript files?
102569
When a user closes a , hide that  on all site pages
112986
Validation / Dirty Flag: should we force users to fix invalid entries before they move to another screen in the software?