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

Use the textchange (not built-in) event to accurately detect text changes via keyboard, paste etc. - http://www.zurb.com/playground/jquery-text-change-custom-event

$('textarea').bind('textchange', function () {
   // $(this).val() contains the new text
});

In your text-change event, check the length/count the words in your text and enable disable the submit button as needed (make sure its initially disabled).