can i ask you something :( i have a trouble with auto expand textarea .

 i want the best jQuery code to expand the textarea when i press the Shift+Enter . and the enter key be to submit the text area :) 

so

when i press enter

i want to submit the form

and when i press shift+enter

the textarea be expanded 

and

how can i check if this textarea is submit because i have many textarea in the page :(