通过客户端验证上传图片文件大小的ASP源码

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<%@Language=JScript @CodePage=936%>
<Script Language=JScript RunAt=Server>
/****************************************************************\
<lostinet:source xmlns:lostinet="lostinet-d2g-com/source">
<lostinet:source-info>
  <lostinet:name>Lostinet_ASP_Upload的例子-动态表单部分</lostinet:name>
  <lostinet:description>一个动态的表单的例子</lostinet:description>
</lostinet:source-info>
<lostinet:author-info>
  <lostinet:name>Lostinet</lostinet:name>
  <lostinet:email>[email protected];[email protected];</lostinet:email>
  <lostinet:homepage>http://lostinet.d2g.com</lostinet:homepage>
</lostinet:author-info>
<lostinet:copyright-info>
  <lostinet:copyright>版权声明:这个软件可以随意发布。也可以根据具体情况进行优化修改。但是请保留作者的相关信息。</lostinet:copyright>
</lostinet:copyright-info>
</lostinet:source>
\****************************************************************/
</Script>
<SCRIPT RUNAT=Server LANGUAGE=JScript>
</SCRIPT>
<HTML>
<HEAD>
<TITLE>JScript Example Form</TITLE>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312" />
</HEAD>
<STYLE>
button
{
border:1px gray solid;
}
div.form_item
{
width:500px;
overflow-x:visible;
padding:4px;
margin-top:8px;
border:2px gray dotted;
}
input.file
{
border:1px gray inset;
width:400px;
}
textarea.info
{
border:1px gray inset;
width:400px;
SCROLLBAR-FACE-COLOR: #cccccc;
SCROLLBAR-HIGHLIGHT-COLOR: WHITE;
SCROLLBAR-SHADOW-COLOR: WHITE;
SCROLLBAR-ARROW-COLOR: maroon;
SCROLLBAR-TRACK-COLOR: #e0e4e4;
SCROLLBAR-3DLIGHT-COLOR: #cccccc;
SCROLLBAR-DARKSHADOW-COLOR: #cccccc;
SCROLLBAR-BASE-COLOR: #cccccc;
}
</STYLE>
<SCRIPT>
var countImgLoading=0;
function GetItemDiv(e)
{
while(e=e.parentElement)
{
  if(e.className.toLowerCase()=="form_item")
  {
   return e;
  }
}
throw(new Error(-1,"Impossible:GetItemDiv发生不能处理的意外"));
}
function GetNamedItem(div,name)
{
return div.all(name);
throw(new Error(-11,"Impossible:GetNamedItem发生不能处理的意外"+name));
}
function Check_Item(div)
{
var file=GetNamedItem(div,"file");
var info=GetNamedItem(div,"info");
var width=GetNamedItem(div,"width");
var height=GetNamedItem(div,"height");
var preview=GetNamedItem(div,"preview");
if(file.value.replace(/\s/g,"")=="")
{
  file.focus();
  return false;
}
if(info.value.replace(/\s/g,"")=="")
{
  info.focus();
  return false;
}
if(info.value.length>1000)
{
  alert("描述的长度不能超过1000字");
  info.focus();
  return false;
}
if(height.value=="0"||width.value=="0")
{
  file.focus();
  return false;
}
if(parseInt(height.value)>800||parseInt(width.value)>600)
{
  alert("图片尺寸大于800X600");
  file.focus();
  return false;
}
if(preview.src.toLowerCase().indexOf("file://")!=0)
{
  alert("只能上传本地文件！！\n请把文件框的内容清楚\n然后按浏览");
  file.focus();
  return false;
}
if(preview.fileSize==0)
{
  file.focus();
  return false;
}
return preview.fileSize;
}
function Check_Form()
{
if(event==null)var event=new Object();
var totalSize=0;
var haveItem=false;
var coll=form_submit.children;
for(var i=0;i<coll.length;i++)
{
  var item=coll.item(i);
  if(item.className.toLowerCase()=="form_item")
  {
   haveItem=true;
   totalSize=Check_Item(item);
   if(totalSize==false)
   {
    alert("该输入框必须填上正确的内容");
    return event.returnValue=false;
   }
  }
}
if(haveItem==false)
{
  Add_FormItem();
  return event.returnValue=false;
}
if(totalSize==0)
{
  alert("不打算上传了");//暂时没有可能执行
  return event.returnValue=false;
}
if(totalSize>1024*1024)
{
  alert("不能上传超过1M的数据");
  return event.returnValue=false;
}
btn_submit.disabled=true;
return event.returnValue=true;
}
function Add_FormItem()
{
form_submit.elements("input_submit").insertAdjacentHTML("beforebegin",form_template.innerHTML);
}
function Delete_FormItem()
{
var btn=event.srcElement;
GetItemDiv(btn).removeNode(true);
}
function Show_Preview()
{
var div=GetItemDiv(event.srcElement);
var preview=GetNamedItem(div,"preview");
var file=GetNamedItem(div,"file");
if(preview.readyState=="uninitialized"||preview.readyState=="complate")countImgLoading++;
btn_submit.disabled=true;
preview.src=file.value;
}
function OnPreviewLoad(secceed)
{
btn_submit.disabled=false;//bug:当表单在提交的时候，忽略
countImgLoading--;
var div=GetItemDiv(event.srcElement);
var preview=GetNamedItem(div,"preview");
var height=GetNamedItem(div,"height");
var width=GetNamedItem(div,"width");
if(secceed)
{
  height.value=preview.height;
  width.value=preview.width;
}
else
{
  height.value=width.value="0";
}
var filesize=GetNamedItem(div,"filesize");
filesize.innerText=Math.floor(preview.fileSize/1024)+"K";
}
function OnPreviewMouseOver(div)
{
if(div.contains(event.fromElement))return;
var divItem=GetItemDiv(div);
var preview=GetNamedItem(divItem,"preview");
div.style.overflow="visible";
preview.style.position="absolute";
}
function OnPreviewMouseOut(div)
{
if(div.contains(event.toElement))return;
var divItem=GetItemDiv(div);
var preview=GetNamedItem(divItem,"preview");
div.style.overflow="hidden";
preview.style.position="static";
}
function OnPreviewClick(div)
{
var divItem=GetItemDiv(event.srcElement);
var preview=GetNamedItem(divItem,"preview");
div.style.overflow="hidden";
preview.style.position="static";
}
</SCRIPT>
<BODY>
<DIV>
  <BUTTON ID="btn_add">添加一个需要上传的图片</BUTTON>
  <BUTTON ID="btn_submit">提交所有内容</BUTTON>
</DIV>
<DIV>
<FORM ID="form_submit" ACTION="e.g.jscript.action.asp" METHOD="POST" ENCTYPE="multipart/form-data" ONSUBMIT="Check_From()">
  <INPUT ID="input_submit" TYPE="submit" STYLE="display:none">
</FORM>
</DIV>

<FORM ID="form_template" STYLE="display:none;">
  <DIV CLASS="form_item">
   <DIV>
    要上传图片(<SPAN id="filesize"></SPAN>)的路径：    <BUTTON CLASS="delete" ONCLICK="Delete_FormItem()">删除</BUTTON>
   </DIV>
   <DIV STYLE="border:1px orange solid;width:200px;height:50px;overflow:hidden;" ONMOUSEOVER="OnPreviewMouseOver(this)" ONMOUSEOUT="OnPreviewMouseOut(this)" ONCLICK="OnPreviewClick(this)">
    <INPUT TYPE="hidden" NAME="width" VALUE="0">
    <INPUT TYPE="hidden" NAME="height" VALUE="0">
    <IMG ID="preview" STYLE="position:static" ONLOAD="OnPreviewLoad(true)" ONERROR="OnPreviewLoad(false)">
   </DIV>
   <DIV>
    <INPUT TYPE="file" NAME="file" CLASS="file" ONCHANGE="Show_Preview()">
   </DIV>
   <DIV>
    相关的描述：
   </DIV>
   <DIV>
    <TEXTAREA NAME="info" CLASS="info" ROWS="4"></TEXTAREA>
   </DIV>
  </DIV>
</FORM>
</BODY>
<SCRIPT>
Add_FormItem();
function btn_add.onclick()
{
Add_FormItem();
}
function btn_submit.onclick()
{
if(Check_Form())
  form_submit.submit();
}
</SCRIPT>
</HTML>