Some of the secure websites on internet such as banks etc. have disabled "Right-click". I know that it's just for preventing the end-user from accessing "Inspect Element" or the "Toolbox" items. But, on some browsers, just pressing F12 key, or any equivalent might does the job.

So, Is there any way to check the webpage for change in code(HTML,CSS and JS) continously, and redirect them to a warning page, if anyone attempts to tamper the code? or just prevent them before they even try to read the code?