本文地址:http://www.cnblogs.com/PiaoMiaoGongZi/p/4092112.html
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。
1 //path 要显示值的对象id 2 function BrowseFolder() { 3 try { 4 var Message = "请选择文件夹"; 5 var Shell = new ActiveXObject("Shell.Application"); 6 var Folder = Shell.BrowseForFolder(0, Message, 0x0040, 0x11); //起始目录为:我的电脑 7 if (Folder != null) { 8 Folder = Folder.items(); // 返回 FolderItems 对象 9 Folder = Folder.item(); 10 Folder = Folder.Path; // 返回路径 11 if (Folder.charAt(Folder.length - 1) != "\") { 12 Folder = Folder + "\"; 13 } 14 var bb = document.getElementByIdx_x("<%=txtBackupPath.ClientID%>"); 15 //document.getElementByIdx_x("BackupPath").value = Folder; 16 bb.value = Folder; 17 return Folder; 18 } 19 } catch (e) { 20 alert(e.message); 21 } 22 }
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:
1 <script type="text/javascript"> 2 3 function browseFolder() { 4 try { 5 var Message = "u8bf7u9009u62e9u6587u4ef6u5939"; //选择框提示信息 6 var Shell = new ActiveXObject("Shell.Application"); 7 var Folder = Shell.BrowseForFolder(0, Message, 64, 17); //起始目录为:我的电脑 8 //var Folder = Shell.BrowseForFolder(0,Message,0); //起始目录为:桌面 9 10 if (Folder != null) { 11 Folder = Folder.items(); // 返回 FolderItems 对象 12 13 Folder = Folder.item(); // 返回 Folderitem 对象 14 Folder = Folder.Path; // 返回路径 15 16 if (Folder.charAt(Folder.length - 1) != "\") { 17 Folder = Folder + "\"; 18 } 19 document.getElementByIdx_x("pathname").value= Folder; 20 return Folder; 21 } 22 } 23 catch (e) { 24 alert(e.message); 25 } 26 } 27 28 </script>
HTML对应的文本框和按钮的使用方法:
<input type="text" id="pathname" /></td> <input type="button" onclick="browseFolder()" value="浏览..."/></td>
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.
1 <html> 2 3 <head> 4 5 <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> 6 <title>无标题文档</title> 7 </head> 8 <body> 9 <table border="0" cellpadding="0" width="100%" id="tb_show"> 10 <tr> 11 <td width="18%">文件保存位置:</td> 12 <td width="82%"> 13 <%--<html:file property="file" size="40" styleClass="inputbox"/>--%> 14 <input name="backDir" type="text" value ="C:" size="100" width="500"> 15 </td> 16 </tr> 17 18 <tr> 19 <td>目录位置:</td> 20 <td> 21 <select name="tables_drive" id="tables_drives" onchange="get_drives()" ></select> 22 </td> 23 </tr> 24 25 <tr> 26 <td colspan="2"> 27 <select name="table_folder" id="table_folder" size="10" multiple ondblclick="get_file()"></select> 28 </td> 29 </tr> 30 31 <tr> 32 <td colspan="2"> 33 <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> 34 </td> 35 </tr> 36 </table> 37 </body> 38 </html> 39 <script> 40 41 window.onload = new function init() 42 { 43 var fso, s, n, e, x; 44 fso = new ActiveXObject("Scripting.FileSystemObject"); 45 e = new Enumerator(fso.Drives); 46 s = ""; 47 for (; !e.atEnd(); e.moveNext()) 48 { 49 x = e.item(); 50 s = s + x.DriveLetter; 51 s += ":"; 52 if (x.DriveType == 3) 53 n = x.ShareName; 54 else if (x.IsReady) 55 n = x.VolumeName; 56 else 57 n = "[驱动器未就绪]"; 58 s += n + ","; 59 } 60 var drives = s.split(","); 61 var tableDrives = document.getElementByIdx_x("tables_drives"); 62 for ( var i = 0; i < drives.length-1; i++ ) 63 { 64 var option = document.createElement_x("OPTION"); 65 drives[i].split(":"); 66 option.value = "["+drives[i].split(":")[0]+":]"+drives[i].split(":")[1]; 67 option.text = "["+drives[i].split(":")[0]+":]"+drives[i].split(":")[1]; 68 tableDrives.add(option); 69 } 70 } 71 72 73 function get_drives() 74 { 75 var tableDrives = document.getElementByIdx_x("tables_drives"); 76 var tableFolders = document.getElementByIdx_x("table_folder"); 77 for ( var i = 0; i < tableDrives.options.length; i++ ) 78 { 79 if ( tableDrives.options[i].selected == true ) 80 { 81 var fso, f, fc, s; 82 var drive = tableDrives.options[i].value.split(":")[0].substring(1,tableDrives.options[i].value.split(":")[0].length); 83 document.getElementByIdx_x("backDir").value = drive + ":\"; 84 fso = new ActiveXObject("Scripting.FileSystemObject"); 85 if (fso.DriveExists(drive)) 86 { 87 d = fso.GetDrive(drive); 88 if ( d.IsReady ) 89 { 90 f = fso.GetFolder(d.RootFolder); 91 fc = new Enumerator(f.SubFolders); 92 s = ""; 93 for (; !fc.atEnd(); fc.moveNext()) 94 { 95 s += fc.item(); 96 s += ","; 97 } 98 99 var len = tableFolders.options.length; 100 while(len >= 0) 101 { 102 tableFolders.options.remove(len); 103 len--; 104 } 105 var option = document.createElement_x("OPTION"); 106 option.value = drive + ":\"; 107 option.text = drive + ":\"; 108 tableFolders.add(option); 109 var folders = s.split(","); 110 for ( j = 0; j < folders.length -1; j++) 111 { 112 option = document.createElement_x("OPTION"); 113 option.value = folders[j]; 114 option.text = folders[j]; 115 tableFolders.add(option); 116 } 117 } 118 else 119 { 120 alert("无法改变当前内容!") 121 } 122 } 123 else 124 return false; 125 } 126 } 127 } 128 129 130 function get_file() 131 { 132 var tableFolders = document.getElementByIdx_x("table_folder"); 133 var tableDrives = document.getElementByIdx_x("tables_drives"); 134 for ( var i = 0; i < tableFolders.options.length; i++ ) 135 { 136 if ( tableFolders.options[i].selected == true ) 137 { 138 var fso, f, fc, s; 139 var folderpath = tableFolders.options[i].value.substring(0,tableFolders.options[i].value.length); 140 if ( folderpath.charAt(folderpath.length-1) == "\" ) 141 { 142 document.getElementByIdx_x("backDir").value = folderpath; 143 } 144 else 145 { 146 document.getElementByIdx_x("backDir").value = folderpath + "\"; 147 } 148 149 150 fso = new ActiveXObject("Scripting.FileSystemObject"); 151 f = fso.GetFolder(folderpath); 152 fc = new Enumerator(f.SubFolders); 153 s = ""; 154 for (; !fc.atEnd(); fc.moveNext()) 155 { 156 s += fc.item(); 157 s += ","; 158 } 159 var len = tableFolders.options.length; 160 while(len >= 0) 161 { 162 tableFolders.options.remove(len); 163 len--; 164 } 165 var opt = ""; 166 var opt1 = ""; 167 for ( j = 0; j < folderpath.split("\").length; j++ ) 168 { 169 var option = document.createElement_x("OPTION"); 170 opt = opt + folderpath.split("\")[j]+"\"; 171 if ( j > 0) 172 { 173 opt1 = opt; 174 option.value = opt1.substring(0,opt1.length-1); 175 option.text = opt1.substring(0,opt1.length-1); 176 tableFolders.add(option); 177 } 178 else 179 { 180 option.value = opt; 181 option.text = opt; 182 tableFolders.add(option); 183 } 184 185 } 186 if ( tableFolders.options[0].value == tableFolders.options[1].value ) 187 { 188 tableFolders.options.remove(1); 189 } 190 if ( s != "" ) 191 { 192 var folders = s.split(","); 193 for ( j = 0; j < folders.length -1; j++) 194 { 195 option = document.createElement_x("OPTION"); 196 option.value = folders[j]; 197 option.text = folders[j]; 198 tableFolders.add(option); 199 } 200 } 201 } 202 } 203 } 204 </script>