JS+ACTIVEX实现网页选择本地目录路径对话框

网页选择本地目录路径对话框，使用ACTIVEX对象遍历本地磁盘和目录，只需网页启用相关ACTIVEX的INTERNET选项，对本地浏览器的安全性要求不高，简单易用。
网页选择本地目录路径对话框样例
1.打开主页面"select.html"，点击“选择路径”按钮进入路径选择页面“dir.html”，选取本地目录路径


2.路径选择页面“dir.html”初始化后，加载本地磁盘驱动，然后根据选择的磁盘路径加载其中的目录。如目录中存在子目录，双击该目录列表项进入下一集目录。


3.点击“确定”，关闭选择路径页面"dir.html"，将选择的路径值返回到主页面"select.html"文本框上

/**//* 
*初始化，将系统所有的驱动器放入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); 
} 
get_drives(); 
} 

/**//* 
*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; 
} 
} 
} 
function get_fileName() 
{ 

var tableFolders = document.getElementById("table_folder"); 
for ( var i = 0; i < tableFolders.options.length; i++ ) 
{ 
if ( tableFolders.options[i].selected == true ) 
{ 
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 + "\\"; 
} 
} 
} 
} 
/**//* 
*table_folder双击选项中的一个选项，就将该文件夹下面的文件夹显示在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); 
} 
} 
} 
} 
}