[Javascript] Disable left mouse click and drag on images

[paul at juniperwebcraft.com (Paul Novitski)]

At 01:05 PM 7/21/2006, Troy III Ajnej wrote:
>THE SCREEN CAPTURE ISSUE - my last cent
>Since almost all screen capture applications along with the "print 
>screen" are invoked with a key stroke, we can use
>key down event to call the clearRAM function just in time before the 
>actual capture takes place. So there will be no
>screen capturing either.


Pretty clever stuff, Troy.  With a little tweaking (the initializing 
logic has to go into a window.onload-triggered function), your script 
fills several of the holes.

However:

- The Print Screen button (on a Windows machine, at least) is not 
captured by the JavaScript onkeydown and onkeypress events.  Even if 
it were, I suspect it would copy the screen image to the clipboard 
before bubbling up to the browser and then to the client-side script.

- In Firefox, neither clicking nor right-clicking on a DIV triggers clearRAM().

- The Firefox web developer toolbar menu pick 'Disable JavaScript' 
halts scripting before the onblur event is processed, leaving the 
page displayed with the original background images.  (In fact, none 
of the web dev toolbar functions seems to trigger the blur event.)

- With the page displayed and then Javascript disabled, the user can 
look at the page source and CSS source to see the image URLs and 
download them as separate requests.

Regards,
Paul