使用Query 进行空值(empty)校验

效果如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
     fieldset{width: 500px;}
     .error{color:red;}
     #info{color:#008000;font-weight:bold;}
    </style>
    <script type="text/javascript" src="../../js/jquery.js"></script>
    <script type="text/javascript">
    $(function(){
        $('#check').click(validate); 

        function validate(){
        var dataValid=true;
        $('#info').html('');
        $('.required').each(function(){
            var cur=$(this);
            cur.next('span').remove();
            if($.trim(cur.val())==''){
            cur.after('<span class="error">Mandatory field</span>')    ;
            dataValid=false;
            }
        });
        if(dataValid){
            $('#info').html('Validation OK!');
        }
        }
    });
    </script>
</head>
<body>
    <form>
        <fieldset>
        <legend><strong>Personal</strong></legend>
        <table>
        <tbody>
            <tr>
            <td>Name:*</td>
            <td><input type="text" class="required"/></td>
            </tr>
            <tr>
            <td>Address:*</td>
            <td><input type="text" class="required"/></td>
            </tr>
        </tbody>
        </table>
    </fieldset>
    <br/>
    <span id="info"></span>
    <br/>
    <input type="button" value="Check" id="check"/>
    </form>
</body>
</html>