K2 Smartforms: How to click a button upon enter key from textbox

k2-button-click-upon-enter.js

<script>
$('.SFC.SourceCode-Forms-Controls-Web-TextBox').keypress(function (e) {
 var key = e.which;
 if(key == 13)
  {
    var value = e.currentTarget.value;
    $(e.currentTarget).SFCTextBox('option', 'text', value);
    $('a[name ="NameOfYOurButton"]').click();
    return false;  
  }
});
</script>

1. if you need a specific textbox, you need to change the first selector
2. In the second part you need to enter the name of your button.
3. If you have more than 1 button with the same name on the form, you need to change the selector.