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1.引用js文件
<script src="~/Scripts/uploadPreview.js"></script>
<html>
//toCalid()在表单提交之前进行非空验证
<form action="/Home/insertImg" method="post" enctype="multipart/form-data" onsubmit="return toCalid()">
<ul>
<li>
<input type="file" id="up_img_WU_FILE_0" name="p1" />
<img id="imgShow_WU_FILE_0" width="100" height="100" />
</li>
<li>
<input type="file" id="up_img_WU_FILE_1" name="p1" />
<img id="imgShow_WU_FILE_1" width="100" height="100" />
</li>
</ul>
</form>
</html>
[post]
public Actionresult insertImg(){
//获取图片信息
HttpPostedFileBase file = Request.Files["p1"];
string filename="";
string ensrc1 ="";
//判断是否有图片
if(file.length>1){
//获取文件名
filename = Path.GetFileName(file.FileName);
string privous = filename.Substring(0, filename.LastIndexOf(‘.‘));
string next = filename.Substring(filename.LastIndexOf(‘.‘));
//存储位置
string filepath = Path.Combine(Server.MapPath("~/Enclosures/"), filename);
//存储
file.SaveAs(filepath);
//存储的路径 端口+文件位置+文件名
ensrc1 = "http://" + Request.UrlReferrer.Authority + "/Enclosures/" + filename;
}
//调用BLL层方法，将参数代入进去即可
}
js文件：
var uploadPreview = function(setting) {
var _self = this;
_self.IsNull = function(value) {
if (typeof (value) == "function") { return false; }
if (value == undefined || value == null || value == "" || value.length == 0) {
return true;
}
return false;
}
_self.DefautlSetting = {
//UpBtn: "",
UpBtn: "",
DivShow: "",
ImgShow: "",
Width: 100,
Height: 100,
ImgType: ["gif", "jpeg", "jpg", "bmp", "png"],
ErrMsg: "选择文件错误,图片类型必须是(gif,jpeg,jpg,bmp,png)中的一种",
callback: function() { }
};
_self.Setting = {
uploader: ‘/Commodity/FileImageUpdateOrAdd‘,
UpBtn: _self.IsNull(setting.UpBtn) ? _self.DefautlSetting.UpBtn : setting.UpBtn,
DivShow: _self.IsNull(setting.DivShow) ? _self.DefautlSetting.DivShow : setting.DivShow,
ImgShow: _self.IsNull(setting.ImgShow) ? _self.DefautlSetting.ImgShow : setting.ImgShow,
Width: _self.IsNull(setting.Width) ? _self.DefautlSetting.Width : setting.Width,
Height: _self.IsNull(setting.Height) ? _self.DefautlSetting.Height : setting.Height,
ImgType: _self.IsNull(setting.ImgType) ? _self.DefautlSetting.ImgType : setting.ImgType,
ErrMsg: _self.IsNull(setting.ErrMsg) ? _self.DefautlSetting.ErrMsg : setting.ErrMsg,
callback: _self.IsNull(setting.callback) ? _self.DefautlSetting.callback : setting.callback
};
_self.getObjectURL = function(file) {
var url = null;
if (window.createObjectURL != undefined) {
url = window.createObjectURL(file);
} else if (window.URL != undefined) {
url = window.URL.createObjectURL(file);
} else if (window.webkitURL != undefined) {
url = window.webkitURL.createObjectURL(file);
}
return url;
}
_self.Bind = function() {
document.getElementById(_self.Setting.UpBtn).onchange = function() {
if (this.value) {
if (!RegExp("\.(" + _self.Setting.ImgType.join("|") + ")$", "i").test(this.value.toLowerCase())) {
alert(_self.Setting.ErrMsg);
this.value = "";
return false;
}
if (navigator.userAgent.indexOf("MSIE") > -1) {
try {
document.getElementById(_self.Setting.ImgShow).src = _self.getObjectURL(this.files[0]);
} catch (e) {
var div = document.getElementById(_self.Setting.DivShow);
this.select();
top.parent.document.body.focus();
var src = document.selection.createRange().text;
document.selection.empty();
document.getElementById(_self.Setting.ImgShow).style.display = "none";
div.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
div.style.width = _self.Setting.Width + "px";
div.style.height = _self.Setting.Height + "px";
div.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = src;
}
} else {
document.getElementById(_self.Setting.ImgShow).src = _self.getObjectURL(this.files[0]);
}
_self.Setting.callback();
}
}
}
_self.Bind();
}
function file_click(){
var WARP = document.getElementById(‘warp‘);
var WARP_LI = WARP.getElementsByTagName(‘li‘);
for(var i=0; i<WARP_LI.length;i++){
new uploadPreview({ UpBtn: "up_img_WU_FILE_"+i, ImgShow: "imgShow_WU_FILE_"+i});
}
}
window.onload = file_click;
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原文地址：http://www.cnblogs.com/jiakai/p/5557426.html
