Asp.net点击按钮弹出文件夹选择框的实现(网页利用ActiveX)

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在Asp.net网站实际的开发中,比如:需要实现点击一个类似于FileUpload的浏览...按钮,弹出文件夹选择框,然后选择本地路径下的某一文件夹,将该路径值付给TextBox。参考了好多网络资料,但是其主要实现方式是通过FileUpload,但是这种文件上传方式去不能很好的解决该功能需求;只好寻求别的解决方法。在不断深入的学习中,发现可以通过JS的方式来得以实现该需求。下面是详细的实现过程,供大家参考。

解决方法1:
调用windows 的shell,但会有安全问题。
该文件定义了BrowseFolder()函数,它将提供一个文件夹选择对话框
以供用户实现对系统文件夹选择的功能,文件夹选择对话框起始目录由
Shell.BrowseForFolder(WINDOW_HANDLE, Message, OPTIONS, strPath)函数的strPath参数设置
例如:0x11--我的电脑;0 ——桌面."c:\\"--系统C盘。
你可以创建一个browseFolder.js,然后进行调用,
用如下代码把该函数应用到一个HTML文件中:
 <script src="browseFolder.js"></script>

或者把下面代码直接复制到<script type="text/javascript">...</script>中得...处;

注:由于浏览器安全方面的问题,你还需要作如下设置才能使本JS代码正确运行,否者会出现“没有权限”的问题。
 1、设置可信任站点(例如本地的可以为:http://localhost)

 2、可信任站点安全级别自定义设置中:选择“Internet选项下——安全选项卡”,点击“自定义级别”按钮设置下面的选项 “对未标记为安全的ActiveX控件进行初始化和脚本运行”,将该项设置为启用。

browserFolder.js:
//path 要显示值的对象id

function BrowseFolder() {                try {                    var Message = "请选择文件夹";                    var Shell = new ActiveXObject("Shell.Application");                    var Folder = Shell.BrowseForFolder(0, Message, 0x0040, 0x11); //起始目录为:我的电脑                    if (Folder != null) {                        Folder = Folder.items(); // 返回 FolderItems 对象                        Folder = Folder.item();                        Folder = Folder.Path; // 返回路径                        if (Folder.charAt(Folder.length - 1) != "\\") {                            Folder = Folder + "\\";                        }                        var bb = document.getElementById("<%=txtBackupPath.ClientID%>");                                                                       //document.getElementById("BackupPath").value = Folder;                        bb.value = Folder;                        return Folder;                    }                } catch (e) {                    alert(e.message);                }            }

Asp.net下,TextBox和Button中的使用方法:

<asp:TextBox runat="server" ID="txtBackupPath"  Width="488px">E:\数据库</asp:TextBox> <asp:Button runat="server" Text="浏览..." Width="78px" OnClientClick="BrowseFolder()"/>

这种方法能很好的实现后台对数据的处理,所以相对完美。

还有一种HTML下的使用方法:

对应的JS如下:

function browseFolder() {        try {            var Message = "\u8bf7\u9009\u62e9\u6587\u4ef6\u5939"; //选择框提示信息            var Shell = new ActiveXObject("Shell.Application");            var Folder = Shell.BrowseForFolder(0, Message, 64, 17); //起始目录为:我的电脑            //var Folder = Shell.BrowseForFolder(0,Message,0); //起始目录为:桌面            if (Folder != null) {                Folder = Folder.items(); // 返回 FolderItems 对象                Folder = Folder.item(); // 返回 Folderitem 对象                Folder = Folder.Path; // 返回路径                if (Folder.charAt(Folder.length - 1) != "\\") {                    Folder = Folder + "\\";                }                document.getElementById("pathname").value = Folder;                return Folder;            }        }        catch (e) {            alert(e.message);        }    }

HTML对应的文本框和按钮的使用方法:

<input type="text" id="pathname" />
<input  type="button" onclick="browseFolder()" value="浏览..."/>

这种方法的不完美的地方是后台对文本框数据的处理比较麻烦。


2.解决方案二:
自己写一个js读取本地硬盘的选择框, 缺点是外观上较上一个差一些.

<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>无标题文档</title></head><body><table border="0" cellpadding="0" width="100%" id="tb_show"><tr><td width="18%">文件保存位置:</td><td width="82%"><%--<html:file property="file" size="40" styleClass="inputbox"/>--%><input name="backDir" type="text" value ="C:\" size="100" width="500"></td></tr><tr><td>目录位置:</td><td><select name="tables_drive" id="tables_drives" onchange="get_drives()" ></select></td></tr><tr><td colspan="2"><select name="table_folder" id="table_folder" size="10" multiple ondblclick="get_file()"></select></td></tr><tr><td colspan="2"><font color="red">说明:双击列表框的一个选项,就将该文件夹下面的文件夹显示在该列表框中。第一个就是根目录</font></td></tr></table></body></html><script>window.onload = new function init(){var fso, s, n, e, x;fso = new ActiveXObject("Scripting.FileSystemObject");e = new Enumerator(fso.Drives);s = "";for (; !e.atEnd(); e.moveNext()){x = e.item();s = s + x.DriveLetter;s += ":";if (x.DriveType == 3)n = x.ShareName;else if (x.IsReady)n = x.VolumeName;elsen = "[驱动器未就绪]";s += n + ",";}var drives = s.split(",");var tableDrives = document.getElementById("tables_drives");for ( var i = 0; i < drives.length-1; i++ ){var option = document.createElement("OPTION");drives[i].split(":");option.value = "["+drives[i].split(":")[0]+":]"+drives[i].split(":")[1];option.text = "["+drives[i].split(":")[0]+":]"+drives[i].split(":")[1];tableDrives.add(option);}}function get_drives(){var tableDrives = document.getElementById("tables_drives");var tableFolders = document.getElementById("table_folder");for ( var i = 0; i < tableDrives.options.length; i++ ){if ( tableDrives.options[i].selected == true ){var fso, f, fc, s;var drive = tableDrives.options[i].value.split(":")[0].substring(1,tableDrives.options[i].value.split(":")[0].length);document.getElementById("backDir").value = drive + ":\\";fso = new ActiveXObject("Scripting.FileSystemObject");if (fso.DriveExists(drive)){d = fso.GetDrive(drive);if ( d.IsReady ){f = fso.GetFolder(d.RootFolder);fc = new Enumerator(f.SubFolders);s = "";for (; !fc.atEnd(); fc.moveNext()){s += fc.item();s += ",";}var len = tableFolders.options.length;while(len >= 0){tableFolders.options.remove(len);len--;}var option = document.createElement("OPTION");option.value = drive + ":\\";option.text = drive + ":\\";tableFolders.add(option);var folders = s.split(",");for ( j = 0; j < folders.length -1; j++){option = document.createElement("OPTION");option.value = folders[j];option.text = folders[j];tableFolders.add(option);}}else{alert("无法改变当前内容!")}}elsereturn false;}}}function get_file(){var tableFolders = document.getElementById("table_folder");var tableDrives = document.getElementById("tables_drives");for ( var i = 0; i < tableFolders.options.length; i++ ){if ( tableFolders.options[i].selected == true ){var fso, f, fc, s;var folderpath = tableFolders.options[i].value.substring(0,tableFolders.options[i].value.length);if ( folderpath.charAt(folderpath.length-1) == "\\" ){document.getElementById("backDir").value = folderpath;}else{document.getElementById("backDir").value = folderpath + "\\";}fso = new ActiveXObject("Scripting.FileSystemObject");f = fso.GetFolder(folderpath);fc = new Enumerator(f.SubFolders);s = "";for (; !fc.atEnd(); fc.moveNext()){s += fc.item();s += ",";}var len = tableFolders.options.length;while(len >= 0){tableFolders.options.remove(len);len--;}var opt = "";var opt1 = "";for ( j = 0; j < folderpath.split("\\").length; j++ ){var option = document.createElement("OPTION");opt = opt + folderpath.split("\\")[j]+"\\";if ( j > 0){opt1 = opt;option.value = opt1.substring(0,opt1.length-1);option.text = opt1.substring(0,opt1.length-1);tableFolders.add(option);}else{option.value = opt;option.text = opt;tableFolders.add(option);}}if ( tableFolders.options[0].value == tableFolders.options[1].value ){tableFolders.options.remove(1);}if ( s != "" ){var folders = s.split(",");for ( j = 0; j < folders.length -1; j++){option = document.createElement("OPTION");option.value = folders[j];option.text = folders[j];tableFolders.add(option);}}}}}</script>


本文在参考http://edu.codepub.com/2009/0616/6342.php的基础上深入分析而得。

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