var isSubmitting = false;

$(document).ready(function () {
    $('Form').submit(function(){
        isSubmitting = true
    })

    $('Form').data('initial-state', $('Form').serialize());

    $(window).on('beforeunload', function() {
        if (!isSubmitting 
              && ( (document.Form.no_edit_info === undefined) || (document.Form.no_edit_info.value == '0') )
              && $('Form').serialize() != $('Form').data('initial-state')){
            return 'Je možné, že provedené změny nebudou uloženy.'
        }
    });
})