I plan on using JSONP to call an external web service to get around the fact that I don't want to create a global function that could potentially conflict with the calling page. I thought that creating a random function name and passing it up would work. Something like this:
<script src="www.foo.com/b?cb=d357534">
where cb is the callback function name, the server would return
d357534({my json data});
What I want to know is how to create the random function name, I'm sure I could use eval but is this the best way to go about it?
Essentially, what I am trying to do is this:
var d + Math.floor(Math.random()*1000001) = function(){...
This should do what you want. You need to save the function name somewhere so that you can pass it to the server, but you can do that inside of a local scope to avoid polluting your global namespace.
var functionName = 'd' + Math.floor(Math.random()*1000001);
window[functionName] = function() { ... }