本文介绍了一个使用ASP.NET实现的图片上传实时预览功能。通过结合HTML、JavaScript及CSS，用户在上传图片文件的同时即可看到80x60像素的预览效果。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="PreviewImageInFileUpload.aspx.cs" Inherits="PreviewImageInFileUpload" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Preview Image In FileUpload</title>
<%--CSS--%>
<style type="text/css">
#newPreview{
FILTER: progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)
}
</style>
</head>
<body>
<%--JavaScript--%>
<script language="javascript" type="text/javascript">
function PreviewImg(imgFile)
{
var newPreview = document.getElementById("newPreview");
newPreview.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgFile.value;
newPreview.style.width = "80px";
newPreview.style.height = "60px";
}
</script>
<form id="form1" runat="server">
<div>
<%--添加onchange事件--%>
<asp:FileUpload ID="FileUpload1" runat="server" onchange="PreviewImg(this)" />
</div>
<%--建立一个div来存放预览--%>
<div id="newPreview"></div>
</form>
</body>
</html>
转自:http://hi.baidu.com/cooll87/blog/item/e014050e0572f9236059f38b.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Preview Image In FileUpload</title>
<%--CSS--%>
<style type="text/css">
#newPreview{
FILTER: progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)
}
</style>
</head>
<body>
<%--JavaScript--%>
<script language="javascript" type="text/javascript">
function PreviewImg(imgFile)
{
var newPreview = document.getElementById("newPreview");
newPreview.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgFile.value;
newPreview.style.width = "80px";
newPreview.style.height = "60px";
}
</script>
<form id="form1" runat="server">
<div>
<%--添加onchange事件--%>
<asp:FileUpload ID="FileUpload1" runat="server" onchange="PreviewImg(this)" />
</div>
<%--建立一个div来存放预览--%>
<div id="newPreview"></div>
</form>
</body>
</html>
转自:http://hi.baidu.com/cooll87/blog/item/e014050e0572f9236059f38b.html
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