Hello,
One solution is to use javascript.
You'll have to use a listener on the field you want to check, like
this (using prototype) :
$('yourTextField').observe('blur', function(e)
or
$('yourform').observe('submit', function(e)
{
var textfield = Event.element(e)
// perform an ajax request to check if the text has been modified.
// if your request returns "true", use the javascript "confirm" to
display your alert message and save or not the modified text.
//
});
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