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JQuery Event for user pressing enter in a textbox? 

$.fn.pressEnter = function(fn) {  

    return this.each(function() {  
        $(this).bind('enterPress', fn);
        $(this).keyup(function(e){
            if(e.keyCode == 13)
            {
              $(this).trigger("enterPress");
            }
        })
    });  
 }; 

//use it:
$('textarea').pressEnter(function(){alert('here')})
 
Ref : http://stackoverflow.com/questions/6524288/jquery-event-for-user-pressing-enter-in-a-textbox
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