可以将文件从桌面拖动到Firefox 3.5中的放置区域并启动上传？ [英] Can I drag files from the desktop to a drop area in Firefox 3.5 and initiate an upload?

问题描述

我在我的放置区域设置了一个ondrop事件，当我将图像从桌面拖动到放置区域时，它会收到一个事件。

I've set a ondrop event on my drop area and it receives an event when I drag an image from my desktop to the drop area.

然而，根据到Recommended_Drag_Types文件：

However, according to the Recommended_Drag_Types document:

https： //developer.mozilla.org/en/DragDrop/Recommended_Drag_Types

使用application / x-具有nsIFile对象的数据值的moz-file类型。非特权网页无法检索或修改此类型的数据。

A local file is dragged using the application/x-moz-file type with a data value that is an nsIFile object. Non-privileged web pages are not able to retrieve or modify data of this type.

这是有道理的，但是如何提示用户升级权限以获取访问文件数据，并通过 XMLHttpRequest 发送它。

That makes sense, but how do I prompt the user to escalate privileges to get access to the file data and send it via an XMLHttpRequest?

如果我尝试当我执行此代码时，不会升级特权：

If I try it without escalating privileges when I do this code:

event.dataTransfer.mozSetDataAt("application/x-moz-file", file, 0);

Javascript返回此错误：

Javascript returns this error:

Permission denied for domain.com to create wrapper for object of class UnnamedClass

我可以找到的唯一的文章是2005年的一篇，但是我无法确定这些方向是否仍然适用于Firefox 3，建议您执行以下操作：

The only article I can find on this is one from 2005 but I can't tell if the directions still apply to Firefox 3, it suggest doing this:

netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');

似乎不起作用。

推荐答案

我发现如果不是全局升级特权：

I found out that if instead of escalating privileges globally:

    netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
    ...
    function doDrop(event) {
       ...
       var file = event.dataTransfer.mozGetDataAt("application/x-moz-file", 0);
       ...
    }

我在功能体内升级权限：

I escalate privileges in the function's body:

    ...
    function doDrop(event) {

       netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
       ...
       var file = event.dataTransfer.mozGetDataAt("application/x-moz-file", 0);
       ...
    }

我摆脱了您所描述的错误，并获得对 nsIFile 实例我正在寻找。

I get rid of the error you described and gain access to the nsIFile instance I was looking for.

这篇关于可以将文件从桌面拖动到Firefox 3.5中的放置区域并启动上传？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！