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【Asp.NET】 FileUpload触发图浏览事件

作者:灏明 / 发布于2016/3/21/ 937

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

 

<!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>无标题页</title>

    <script language="javascript" type="text/javascript">

       function change() { 

            var fileName = document.getElementById("FileUpTrolley").value; 

            if (fileName == "") 

                return; 

            var exName = fileName.substr(fileName.lastIndexOf(".") + 1).toUpperCase() 

            if (exName == "JPG" || exName == "BMP" || exName == "GIF") { 

                document.getElementById("Img1").src = fileName; 

 

            } 

            else { 

                alert("请选择正确的图片文件"); 

                document.getElementById("FileUpTrolley").value = ""; 

            } 

 

 

        } 

        </script>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <asp:FileUpload ID="FileUpTrolley" runat="server" onchange="change()" />

 

                    <asp:Image ID="Img1" runat="server" Height="200" Width="200" />

 

</div>

    </form>

</body>

</html>

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　浏览事件　

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