通过客户端验证上传图片文件大小的ASP源码

<%@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>lostinet@21cn.com;lostinet@chongjian.com;</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>

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