I have an input textbox on a form in which I want upper-case characters only, to which end I am using style="text-transform:uppercase" in the HTML input definition.  Text is converted to upper-case upon data-entry, but when the value is posted, it is passed in the entered case, not always uppercase.

 

How can I ensure that entered data AND posted value are both uppercase?  I would prefer a HTML/CSS solution if possible, but failing that, JavaScript will do.

 

TIA
Alan