jquery.validate.min.js 非空验证

<script type="text/javascript">

$("#dataForm").validate({
//debug: true,
  rules: {
  attachment:"required"
  },
  messages: {
  attachment: "附件不能为空"
  },
  errorPlacement: function(error, element) {
  var classes = element.attr('class');
  if (classes.indexOf('Wdate') != -1) {
  element.parent().append(error).append("&nbsp;");
  } else {
  error.appendTo(element.parent());
  }
  },
  submitHandler: function(form) {  
 
   
  var url = "${contextPath}/service/pageReq";
  var content = "";
$("#dataForm").ajaxSubmit({
url : "${contextPath}/service/pageReq",
type : 'post',
    dataType : "json",
data : {"content":content,"needcontrolprocess": "inspectionFileBusiness.injectSaveInspectionFile"},
success : function(result) {
if (result.status == 'FAIL') {
art.dialog({
title : '消息',
//width : '300px',
content: result.processMsg,
lock : true,
ok: true
});
} else {
_myDialog.close();
doSearch();
art.dialog({
title : '消息',
width : '300px',
content: result.processMsg,
lock : true,
ok: true
});
}

}
});   
  }
});

$(document).ready(function() {
$('#button-submit').click(function() {
$("#dataForm").submit();
});
});

</script>