Is it even possible to change the user clipboard via JavaScript?
I want them to click a given point on the map and add the position coordinates to the clipboard.
I still assume this is not possible for JavaScript.
You can try using the zeroclipboard library, which involves placing an invisible flash element on the page to actually copy text to the clipboard.
This is in Internet Explorer, but not in other browsers, although support can be hacked together in other browsers by inserting Flash every time you want to make a copy. Not very useful, I would say, since it also imposes usability flaws .
If I remember correctly, this is possible in Internet Explorer (perhaps the site should be in the "trusted" zone), but not in Firefox or Opera.