Stop submit button being pressed until enough words are written in text area

Question

So basically what I want is for the submit button to be disabled until a certain word count has been reached in the text area.

I have had a look around and tried to find

Answer 1

see this example at http://elylucas.net/post/Enabling-a-submit-button-when-a-textbox-has-value-in-jQuery.aspx

instead of checking for a value, you split the input string in the text box and see the length of the array is more than your desired word count