input type=\"file\" 的onchange事件

 <input id="FileUpload" type="file" style="width:448px; height: 22px;"
                                    onclick="return FileUpload_onclick()" onchange="return FileUpload_onselect()"/>

 

 <script type="text/javascript" language="javascript">   
        function FileUpload_onselect()
        {
            var path;
            path=document.forms[0].FileUpload.value;      //C:\Documents and Settings\hud\桌面\AddFile.jpg
            var aa;
            aa=path.split('.');
            document.all('TbxName').value=aa[aa.length-1];  //jpg 结果

            var name;
            name=path.split('\\');
            var bb=name[name.length-1];            
            document.all('Tbx_FileName').value=bb.substr(0,bb.indexOf('.'));  //AddFile 结果
        }
    </script>

来源：https://www.cnblogs.com/hyd309/archive/2008/09/22/1295895.html