How to make a CDF document with dynamic content?

Question

I would like to create a CDF document that uses dynamic content. The example code is:

fun=x^2-1;
InputField[Dynamic[fun]]

And what I get is $Aborted instead of interactive document. How to make a useful document?

EDIT:

What I am really trying to do is to make a CDF document in which the given function is plotted. Initially the function is x^2-1, but the user should be able do input any function.

Answer 1

Actually doing

CDFDeploy["test.cdf", Manipulate[
  Plot[fun, {x, 0, 10}],
  {fun, x^2 - 1}], Method -> "Standalone"]

you will see that the FreeCDF will not let you do what you want, i.e., some interaction like you get in normal Mathematica by:

Manipulate[
 Plot[fun, {x, 0, 10}],
 {fun, x^2 - 1}]

Check out the differences between FreeCDF and Enterprise CDF http://www.wolfram.com/cdf/adopting-cdf/licensing-options.html

The important little detail is "arbitary input fields": this is just not enabled in FreeCDF. So, it looks like you have to get Mathematica Enterprise in order to produce EnterpriseCDF's.

Oh, and don't forget to "Contact the CDF Team" : http://www.wolfram.com/cdf/contact-us/

Answer 2

This may do what you want:

InputField[Dynamic[x, (x = #^2 - 1) &]]