jeditable maxlength

In jquery.jeditable.js add:

if (settings.maxlength) { input.attr('maxlength', settings.maxlength); }

right below:

if (settings.height != 'none') { input.height(settings.height); }

Then set maxlength

$('.loremipsum').editable('http://www.example.com/save.php', {
    ...
    maxlength: 20
});

reference: http://www.appelsiini.net/projects/jeditable (user Sasi's comment)