firefox - 如何将网页保存到Firefox插件中的所需位置

Question

如何在 Firefox 插件中使用 javascript 将当前网页保存到所需位置。我有一个按钮。当用户单击按钮时，我希望打开资源管理器窗口并将文件保存到所需位置。

Answer 1

将此函数downloadFile(title, url, fileType)与适当的参数一起使用

function downloadFile(title, url, fileType) 
{
    var file = getDownloadFile(title, fileType);

    var persist = Components.classes['@mozilla.org/embedding/browser/nsWebBrowserPersist;1'].createInstance(Components.interfaces.nsIWebBrowserPersist);  
    var ios = Components.classes['@mozilla.org/network/io-service;1'].getService(Components.interfaces.nsIIOService);  
    var uri = ios.newURI(url, null, null); 

    var target = ios.newFileURI(file) 
    var xfer = Components.classes["@mozilla.org/transfer;1"]  
                           .createInstance(Components.interfaces.nsITransfer);  
    xfer.init(uri, target, "", null, null, null, persist);  
    persist.progressListener = xfer; 
    persist.saveURI(uri, null, null, null, null, file);

}

function getDownloadFile(defaultString, fileType) 
{
    var nsIFilePicker = Components.interfaces.nsIFilePicker;

    var fp = Components.classes["@mozilla.org/filepicker;1"].createInstance(nsIFilePicker);
    fp.init(window, "Save As", nsIFilePicker.modeSave);
    try {
        var urlExt = defaultString.substr(defaultString.lastIndexOf(".")+1, 3);
        if (urlExt!=fileType) defaultString += "." + fileType
    }catch(ex){}

    fp.defaultString = defaultString;

    fp.appendFilter(fileType, "*." + fileType);
    var rv = fp.show();
    if (rv == nsIFilePicker.returnOK || rv == nsIFilePicker.returnReplace) {
      var file = fp.file;
      var path = fp.file.path;
      return file;
    }
    return null;
}