在Firefox插件中顯示目錄瀏覽對話框

Question

我想讓我的用戶通過顯示一個對話框選擇一個文件夾。

這可能來自JavaScript的Firefox插件嗎？

Answer 1

是的，有這樣的一個簡單的方法。正常的方法是使用nsIFilePicker。

與該頁上的示例的主要區別在於傳遞給init()方法的參數中，指定nsIFilePicker.modeGetFolder爲mode。另外，鑑於您正在查找目錄，您只想包含nsIFilePicker.filterAll過濾器，而不是針對特定擴展類型的過濾器。從MDN頁

實施例的代碼，修改用於拾取文件夾（以及給出說明性的變量名）：

if (window === null || typeof window !== "object") { 
    //If you do not already have a window reference, you need to obtain one: 
    // Add a "/" to un-comment the version appropriate for your environment. 

    /* Add-on SDK environment: 
    var window = require('sdk/window/utils').getMostRecentBrowserWindow(); 
    //*/ 

    /* Overlay and bootstrap environments (from almost any context/scope): 
    var window = Components.classes["@mozilla.org/appshell/window-mediator;1"] 
          .getService(Components.interfaces.nsIWindowMediator) 
          .getMostRecentWindow("navigator:browser"); 
    //*/ 
} 


const nsIFilePicker = Components.interfaces.nsIFilePicker; 

var filePicker = Components.classes["@mozilla.org/filepicker;1"] 
       .createInstance(nsIFilePicker); 
filePicker.init(window, "Dialog Title", nsIFilePicker.modeGetFolder); 
filePicker.appendFilters(nsIFilePicker.filterAll); 

var pickerStatus = filePicker.show(); 
if (pickerStatus == nsIFilePicker.returnOK 
    || pickerStatus == nsIFilePicker.returnReplace 
) { 
    var file = filePicker.file; 
    // Get the path as string. Note that you usually won't 
    // need to work with the string paths. 
    var path = filePicker.file.path; 
    // work with returned nsILocalFile... 
}