关于多文件上传,孟宪会做了vb和c#版本的(原文:http://dotnet.aspx.cc/article/58ea3515-36f2-4fd9-ac89-eaf49f59816c/read.aspx),他的思想就是点击增加按钮后用javascript操作增加一个input file DOM元素。他这种方式显得并不是很美观。
通常我们会希望可以控制input file的'浏览...',以达到美观的效果,不过默认是更改不了这个。如果自己添加一个input text文本框,然后放一个button ,然后用css控制外观,结合javascript操作就可以达到多目的了。
我的思想是自己添加input text和button模拟input file显示的效果,用css进行设置所添加控件的外观,将真正的input file进行隐藏,点击上传button后,文件并没真正的上传以减少与服务器来回传送数据,只把上传后的效果显示到当前页面,就是模拟上传。因为在上传中,如果用户想取消已上传的文件,点击页面上显示的那些需要删除的文件就可以了,这样删除当然也没有与服务器交互。当点击确定后,所有添加的文件采用ajax技术上传到服务器。当进入到上传的页面,会显示已上传过的文件,这些都是已经在服务器了。如果删除已上传的文件,同样只需点击删除标志,这也是模拟删除,并没有真正的删除文件,只是将其状态置为删除,后面附上恢复操作。当确定后,这些文件将会被物理上删除,同时从数据库清除对应的信息。
首次进入页面,显示已上传的文件,效果为:
![](https://images.cnblogs.com/cnblogs_com/huankfy/fileup.GIF)
代码如下:
添加,删除文件演示效果如下:
![](https://images.cnblogs.com/cnblogs_com/huankfy/fieldel.GIF)
aspx页面做为模型部分,代码如下
input type=file上传到服务器,form的enctype="multipart/form-data"属性设置不能少,否则无法传送到服务器,即HttpContext.Current.Request.Files为空。
css做为视图部分,这里只是简单的设置,代码:
最重要的是虑镜功能,它实际上隐藏了真正的input file元素。
下面的代码做为控制部分,写的较凌乱,采用ajax技术做了简单的处理,不正之处望各位赐教。如下所示:
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var i=1;
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/**
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**清除上传选择的文件,模拟上传时的文件
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**/
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function DelFile(){
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var spanDOM=getElement("del_"+this.id);
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spanDOM.innerHTML="";
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getElement("delinput_"+this.id).innerHTML=""; //清除对应的input type=file控件
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var div=getElement("Results");
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var spans=div.getElementsByTagName("a");
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if(spans){
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for(var j=0;j<spans.length;j++){
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var k=j+1;
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spans[j].innerHTML=k+". ";
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}
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}
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}
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function cancleDel(){
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var id=this.id
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id=id.split('_');
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var spand=getElement(id[1]);
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spand.innerHTML="×";
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}
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/**
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**模拟删除服务器上的文件
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**/
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function DelFiles(id){
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var spanDOM=getElement(id);
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spanDOM.innerHTML="已被删除 ";
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var cancle=createElement("a");
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cancle.innerHTML="恢复 ";
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cancle.id="m_"+id;
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cancle.onclick=cancleDel;
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spanDOM.appendChild(cancle);
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}
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/**
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**提交删除,删除服务器上的文件
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**/
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function SaveModify(){
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var bord=getElement('uploadedfiles');
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var files=bord.getElementsByTagName("a");
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for(var m=0;m<files.length;m++){
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var parents=files[m].parentElement;//<a>的父级元素
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parents=parents.parentElement;
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var filepath=parents.path;
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var url="do.aspx?path="+UrlEncode(filepath);
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StateChange(url);
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}
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}
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/**
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**创建xmlhttp对象
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**/
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function CreateXMLHttp(){
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var httpxml;
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if(window.ActiveXObject)
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httpxml=new ActiveXObject("microsoft.XMLHTTP"); //基于ie的xmlhttp
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else
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httpxml=new XMLHttpRequest();
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return httpxml;
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}
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/**
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**readystatechange事件
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**/
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function StateChange(url){
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var httpxml;
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httpxml=CreateXMLHttp();
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httpxml.open("post",url,true);
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httpxml.send();
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httpxml.onreadystatechange=function(){
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if(httpxml.readyState==4)
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if(httpxml.status==200){
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/*
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**操作成功
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**这里放置你自己的代码
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**/
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}
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}
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}
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/**
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**模拟上传文件
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**显示‘上传’后的文件名
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**创建一个input file元素
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**/
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function UpLoadEvent(){
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var k=i-1;
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var filename=getElement("files").value;
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if(filename.length>0){ //是否已经选择文件
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var spandom=createElement("span");
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spandom.id="del_"+k;
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var spannumber=createElement("a");//创建用于显示文件序号的span标签
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spannumber.name="spancounter";
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var div=getElement("Results");
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var divs=div.getElementsByTagName("div");
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var j=divs.length+1;
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spannumber.innerHTML=j+". ";//显示文件序号
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var divdom=createElement("div"); //用于显示文件名的div
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divdom.innerHTML=filename.substring(filename.lastIndexOf("\\")+1);
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divdom.className="colortuhuang";
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var spanx=createElement("span"); //显示用于删除文件的‘图片’
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spanx.className="errorShow";
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spanx.innerHTML=" ×<br>";
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spanx.id=k;
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spanx.onclick=DelFile;
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spandom.appendChild(spannumber);
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spandom.appendChild(divdom);
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spandom.appendChild(spanx);
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div.appendChild(spandom);
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getElement("files").value=""; //置空input type=text框,防止多次点击上传按钮
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}
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else
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alert("未选择文件");
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}
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/**
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**点击选择文件事件
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**/
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function clickEvent(){
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var inputfile=getElement("file_"+i);
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if(inputfile.value.length>0){//当选择文件后进行追加Input type=file控件,否则不予处理
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getElement("files").value=inputfile.value;
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inputfile.className="InputFileAfterSelect"; //选择文件完成后将其移出焦点之外
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var divdom=getElement("allfile");
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var spanfdom=createElement("span");
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spanfdom.id="delinput_"+(++i);
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var inputdom=createElement("input");
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inputdom.type="file";
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inputdom.id="file_"+i;
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inputdom.name="file_"+i;
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inputdom.className="InputFileBeforeSelect";
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inputdom.onchange=clickEvent;
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var btn=new MouseOverObj("file_"+i);
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inputdom.onmouseover=btn.BrowseMouseOver;
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spanfdom.appendChild(inputdom);
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divdom.appendChild(spanfdom);
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setFocus();
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}
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}
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/**
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**设置焦点
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**/
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function setFocus(){
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document.getElementById("browse").focus();
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}
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function getElement(id){
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return document.getElementById(id);
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}
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function createElement(tag){
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return document.createElement(tag);
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}
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function MouseOverObj(fileid){
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this.buttonobj=getElement("browse")
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this.id=fileid;
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this.buttonobj.inputfile=this;
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}
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MouseOverObj.prototype.BrowseMouseOver=function(){
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var inputfile=this.inputfile || this.getAttirbute("inputfile "); //取得附加在browse按钮上的inputfile对象
点击“上传确定”,执行保存文件到服务器操作:
private void ok_Click(object sender, System.EventArgs e)
{
System.Text.StringBuilder strb=new System.Text.StringBuilder();
HttpFileCollection files=HttpContext.Current.Request.Files;
for(int i=0;i<files.Count;i++)
{
HttpPostedFile file=files[i];
strb.Append("文件名:"+System.IO.Path.GetFileName(file.FileName)+"<br>");
strb.Append("文件类型:"+file.ContentType.ToString()+"<br>");
strb.Append("文件大小:"+file.ContentLength+"<br>");
file.SaveAs("the pos
.");
/*
*
* save the information of the file to database
* */
}
this.Label1.Text=strb.ToString();
}
Label1给出所上传的文件信息。
此例只在ie下面运行,firefox下面有问题,如虑镜、event在firefox下都出问题,还需要修改。
通常我们会希望可以控制input file的'浏览...',以达到美观的效果,不过默认是更改不了这个。如果自己添加一个input text文本框,然后放一个button ,然后用css控制外观,结合javascript操作就可以达到多目的了。
我的思想是自己添加input text和button模拟input file显示的效果,用css进行设置所添加控件的外观,将真正的input file进行隐藏,点击上传button后,文件并没真正的上传以减少与服务器来回传送数据,只把上传后的效果显示到当前页面,就是模拟上传。因为在上传中,如果用户想取消已上传的文件,点击页面上显示的那些需要删除的文件就可以了,这样删除当然也没有与服务器交互。当点击确定后,所有添加的文件采用ajax技术上传到服务器。当进入到上传的页面,会显示已上传过的文件,这些都是已经在服务器了。如果删除已上传的文件,同样只需点击删除标志,这也是模拟删除,并没有真正的删除文件,只是将其状态置为删除,后面附上恢复操作。当确定后,这些文件将会被物理上删除,同时从数据库清除对应的信息。
首次进入页面,显示已上传的文件,效果为:
代码如下:
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private void iniPaged(){
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DBOper db=new DBOper();
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string strsql="select * from up_all";
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DataTable dt=db.getData(strsql).Tables[0];
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System.Text.StringBuilder strbl=new System.Text.StringBuilder();
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strbl.Append("<br><span id='uploadedfiles'><span><span name='filename'>文件名 </span><span class='divshow'>日期 </span><span>删除</span></span><br>");
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for(int i=0;i<dt.Rows.Count;i++){
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strbl.Append("<span id='up_"+i+"' path='"+dt.Rows[i]["up_path"].ToString()+"'><span>"+dt.Rows[i]["up_name"].ToString()+"</span><span>"+dt.Rows[i]["up_date"].ToString()+"</span><div class='divshow errorShow' id="+i+" onclick='DelFiles("+i+")'>×</div></span><br>");
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}
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strbl.Append("</span>");
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this.Label1.Text=strbl.ToString();
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}
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添加,删除文件演示效果如下:
aspx页面做为模型部分,代码如下
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<form id="Form1" method="post" encType="multipart/form-data" runat=server>
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<div><input id="files" type="text"><input id="browse" type="button" value="浏览
" name="file"><input id="up" onclick="UpLoadEvent()" type="button" value="上传">
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</div>
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<div id="Results"></div>
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<div class="HideInputFile" id="allfile"><span id="delinput_1"><input id="file_1" type="file" name="file_1"></span>
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</div>
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<br>
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<asp:Button ID="ok" Text="上传确定" Runat="server"></asp:Button>
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<input type="button" value="删除确定" onclick="SaveModify()">
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<asp:label id="Label1" runat="server"></asp:label>
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</form>
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input type=file上传到服务器,form的enctype="multipart/form-data"属性设置不能少,否则无法传送到服务器,即HttpContext.Current.Request.Files为空。
css做为视图部分,这里只是简单的设置,代码:
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.errorShow { CURSOR: hand; COLOR: #ff0000 }
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.colortuhuang { DISPLAY: inline; MARGIN-LEFT: 1pt; COLOR: #c49238; MARGIN-RIGHT: 1pt; HEIGHT: 0px; TEXT-ALIGN: left }
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.divshow { DISPLAY: inline; MARGIN-LEFT: 1pt; MARGIN-RIGHT: 1pt; HEIGHT: 0px; TEXT-ALIGN: left }
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.InputFileBeforeSelect { FILTER: alpha(opacity=0); WIDTH: 10px; POSITION: absolute }
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.InputFileAfterSelect { FILTER: alpha(opacity=0) }
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.HideInputFile { FILTER: alpha(opacity=0) }
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
最重要的是虑镜功能,它实际上隐藏了真正的input file元素。
下面的代码做为控制部分,写的较凌乱,采用ajax技术做了简单的处理,不正之处望各位赐教。如下所示:
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var inputdom=getElement(inputfile.id);
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with(inputdom){
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style.posTop=event.srcElement.offsetTop; //设置透明上传框的Y坐标跟模拟按钮的Y坐标对齐
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style.posLeft=event.x-offsetWidth/4 ;
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}
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}
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window.onload=function(){
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var button=new MouseOverObj("file_1");
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getElement("browse").onmouseover=button.BrowseMouseOver;
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with(getElement("file_1")){
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className="InputFileBeforeSelect";
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onchange=clickEvent;
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}
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}
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点击“上传确定”,执行保存文件到服务器操作:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/dot.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
此例只在ie下面运行,firefox下面有问题,如虑镜、event在firefox下都出问题,还需要修改。