JavaScript → Проверка формы на JavaScript

Пример реализации простой проверки формы на JavaScript без использования jQuery. Пример формы:

<form name="form_name" method="POST" action="/">
    <input type="text" name="fio" />
    <input type="text" name="email" />
    <input type="text" name="message" />
    <input type="button" value="send" onClick="check_form()" />
</form>

Реализация простой валидации формы на JavaScript:

function IsText(obj,msg) {
    if( obj.value.length == 0 ) {
        alert(msg);
        obj.focus();
    }
}

function check_form() {
   var ob = document.forms['form_name'];
   if( IsText(ob.fio, "Укажите ФИО, пожалуйста") != 1 ) return;
   if( IsText(ob.email, "Укажите ваш e-mail, пожалуйста") != 1 ) return;
   if( IsText(ob.message, "Введите сообщение, пожалуйста") != 1 ) return;
   ob.submit();
}

Related: lee county, florida setback requirements, larkin mortuary obituaries ogden, brenda kay moore crescent city ca, why do so many celebrities have lyme disease, dr blum orthopedic surgeon, natchez democrat crime report, transport companies looking for subcontractors, ellen lebowitz partner, tom brands daughter married, sketch endpoints cannot be deleted solidworks, mygov issues today, ben selecman funeral, paris hilinski family, gorgonzola pear pasta purses, young nicks head walk gisborne,