JavaScript文件上传验证


//置于<Head>之间

<script language="JavaScript">
<!--
//检查上传物件 checkFileUpload(表单名称,档案类型,是否需要上传,档案大小,图片最小宽度,图片最小高度,图片最大宽度,图片最大高度,储存宽度的表单名称,储存高度的表单名称)
function checkFileUpload(form,extensions,requireUpload,sizeLimit,minWidth,minHeight,maxWidth,maxHeight,saveWidth,saveHeight) {
  document.MM_returnValue = true;
  if (extensions != '') var re = new RegExp("\.(" + extensions.replace(/,/gi,"|") + ")$","i");
  for (var i = 0; i<form.elements.length; i++) {
    field = form.elements[i];
    if (field.type.toUpperCase() != 'FILE') continue;
    if (field.value == '') {
      if (requireUpload) {alert('请选取上传的文件！');document.MM_returnValue = false;field.focus();break;}
    } else {
      if(extensions != '' && !re.test(field.value)) {
        alert('这个文件不符合上传的类型！\n只有以下的类型才允许上传： ' + extensions + '。\n请依规定选取新的上传文件。');
        document.MM_returnValue = false;field.focus();break;
      }
    document.PU_uploadForm = form;
    re = new RegExp(".(gif|jpg|png|bmp|jpeg)$","i");
    if(re.test(field.value) && (sizeLimit != '' || minWidth != '' || minHeight != '' || maxWidth != '' || maxHeight != '' || saveWidth != '' || saveHeight != '')) {
      setTimeout('if (document.MM_returnValue) document.PU_uploadForm.submit()',500);
      checkImageDimensions(field.value,sizeLimit,minWidth,minHeight,maxWidth,maxHeight,saveWidth,saveHeight);
    } } }
}

//-->
  </script>

//置于<body>里面
onSubmit="checkFileUpload(this,'GIF,JPG,JPEG,PNG,BMP',true,'','','','','','','');return document.MM_returnValue"

posted @ 2006-02-27 17:10  Hermes.Liu  阅读(739)  评论(0)  编辑  收藏  举报