Javascript檔案夾選擇框的兩種解決方案

來源：http://www.blogjava.net/supercrsky/archive/2008/06/17/208641.html

解決方案1:
調用windows 的shell,但會有安全問題.

* browseFolder.js
* 該檔案定義了BrowseFolder()函數，它將提供一個檔案夾選擇對話方塊
* 以供使用者實現對系統檔案夾選擇的功能
* 檔案夾選擇對話方塊起始目錄由
* Shell.BrowseForFolder(WINDOW_HANDLE, Message, OPTIONS, strPath)函數
* 的strPath參數設定
* 例如：0x11--我的電腦
* 0 --案頭
* "c:"--系統C盤
*
* 用如下代碼把該函數應用到一個HTML檔案中：
* ＜script src="browseFolder.js"＞＜/script＞
* 或把下面代碼直接COPY到＜script language="javascript"＞...＜/script＞標籤中；

* 特別注意的是,由於安全方面的問題,你還需要如下設定才能使本JS代碼正確運行,
* 否者會出現"沒有許可權"的問題.
*
* 1、設定可信任網站（例如本地的可以為：http://localhost）
* 2、其次：可信任網站安全層級自訂設定中：設定下面的選項
* "對沒有標記為安全的ActiveX控制項進行初始化和指令碼運行"----"啟用"

browserFolder.js:
/**//***
path 要顯示值的對象id
****/
function browseFolder(path) {
try {
var Message = "\u8bf7\u9009\u62e9\u6587\u4ef6\u5939"; //選擇框提示資訊
var Shell = new ActiveXObject("Shell.Application");
var Folder = Shell.BrowseForFolder(0, Message, 64, 17); //起始目錄為：我的電腦
//var Folder = Shell.BrowseForFolder(0,Message,0); //起始目錄為：案頭
if (Folder != null) {
Folder = Folder.items(); // 返回 FolderItems 對象
Folder = Folder.item(); // 返回 Folderitem 對象
Folder = Folder.Path; // 返迴路徑
if (Folder.charAt(Folder.length - 1) != "") {
Folder = Folder + "";
}
document.getElementById(path).value = Folder;
return Folder;
}
}
catch (e) {
alert(e.message);
}
}

使用的時候:
＜td＞
＜input type="text" name="path" /＞
＜/td＞
＜td＞
＜input type="button" onclick="browseFolder('path')"
value="選擇產生路徑" /＞
＜/td＞
2.解決方案二:
自己寫一個js讀取本地硬碟的選擇框, 缺點是外觀上較上一個差一些.

＜html＞
＜head＞
＜meta http-equiv="Content-Type" content="text/html; charset=gb2312"＞
＜title＞無標題文檔＜/title＞
＜/head＞
＜body＞
＜table border="0" cellpadding="0" width="100%" id="tb_show"＞
＜tr＞
＜td width="18%"＞檔案儲存位置:＜/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＞目錄位置:＜/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"＞說明：雙擊列表框的一個選項，就將該檔案夾下面的檔案夾顯示在該列表框中。第一個就是根目錄＜/font＞
＜/td＞
＜/tr＞
＜/table＞
＜/body＞
＜/html＞
＜script＞
/**//*
*初始化，將系統所有的磁碟機放入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 = "[磁碟機未就緒]";
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列表中選中的磁碟機上所有檔案夾放入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("無法改變當前內容！")
}
}
else
return false;
}
}
}

/**//*
*table_folder雙擊選項中的一個選項，就將該檔案夾下面的檔案夾顯示在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＞