JavaScript 实现文件夹选择框的两种方案

利用Shell组件调用系统文件夹对话框

调用Windows Shell实现文件夹选择，但存在安全风险。

* browseFolder.js

* 该文件定义了BrowseFolder()函数，提供文件夹选择对话框。

* 用于实现系统文件夹选择功能。

* 对话框起始目录由

* Shell.BrowseForFolder(WINDOW_HANDLE, Message, OPTIONS, strPath)函数

* 的strPath参数设定。

* 例如：0x11代表我的电脑

* 0代表桌面

* "c:\\"代表系统C盘

* 使用以下代码将函数应用到HTML文件中：

* <script src="browseFolder.js"></script>

* 或将代码直接复制到<script language="javascript">...</script>标签中；

* 1、设置可信任站点（例如本地站点为：http://localhost）

* 2、在可信任站点安全级别自定义设置中：设置以下选项

* "对没有标记为安全的ActiveX控件进行初始化和脚本运行"----"启用"

browserFolder.js:

 
/**//*** 
path 显示值的对象id
****/ 
function browseFolder(path) {
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(path).value = Folder;
return Folder;
} 
} 
catch (e) {
alert(e.message);
} 
} 

使用时示例:

 
<td>
<input type="text" name="path" />
</td>
<td>
<input type="button" onclick="browseFolder('path')"
value="选择生成路径" />
</td>

使用FileSystemObject构建自定义目录选择界面

2.解决方案二:

自行编写JS读取本地硬盘选择框，缺点是外观较前者差。 <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：双击列表框选项，将该文件夹下的文件夹显示在该列表框中。第一个即为根目录</font>
</td>
</tr>
</table>
</body>
</html>
<script>
/**//* 
*初始化，将系统所有驱动器放入table_drives列表
*/ 
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;
else
n = "[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);
} 
} 
/**//* 
*tables_drives列表中选中的驱动器上所有文件夹放入table_folder列表中
*/ 
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！")
} 
} 
else
return false;
} 
} 
} 
/**//* 
*table_folder双击选项，将该文件夹下的文件夹显示在table_folder列表中。
*/ 
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>

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