Changing keyboard type for html textarea on iPad

Question

I\'m writing a web application for iPad. I know it\'s possible to change the type of keyboard displayed when an html input field is selected using:

Answer 1

if you use the "enter" key is replaced by a "search" button, I haven't been able to find a listing of all the different combinations, but I'm sure there is one to you liking.
Note: The input must be inside a form element for this to work.