Sometimes we have requirement to disable Right Click context menu and Text selection of a web page from the user, so that the user cannot use the right click default context menu and also to disable text selection so that sensitive data could not be copied from the website.
To Disable Context Menu
document.oncontextmenu = function(){return false;};
If you just place this line in your page under script tag, the context menu will get disabled.
To Disable Text Selection
document.onselectstart= function() {return false;};
This will disable Selection in IE. For Mozilla we need to apply CSS to the body element.
-moz-user-select: none;
This will disable selection in Mozilla.
You can also disable selection for a single container. For instance :
<div onselectstart="return false;"
style="-moz-user-select: none;">
This will disable selection of Text for the container.
Hope this will help you.