如何使用Firefox Addon Builder记录选定的文本？

问题描述

我已经跟着几个教程没有成功。我认为这是一个典型的例子，但我不能使它工作。我可以保存我的项目，安装插件，当我选择一些文本，我可以看到上下文菜单项日志选择，但是当我点击它时，什么也没有发生。

  
您不能使用 alert 直接在一个lib /模块中。没有窗口可以显示警报，因此没有 alert 函数。
 
 
 
查看。
 
 
 
如果你真的想显示一些东西，你可以使用或 alert 使用 nsIPromptService （例如），或者从一个内容文件（widget等等）。
 
 
 
这里是一个展示不同方法的例子 a>。
 
I have followed several tutorials with no success. I think this is the classic example but I can't make it work. I can save my project, install the addon and I can see the context menu item "Log Selection" when I select some text, but when I click on it nothing happens.
exports.main = function() {

    var contextMenu = require("context-menu");
    var request = require("request");
    var selection = require("selection");

    var menuItem = contextMenu.Item({
        label: "Log Selection",
        context: contextMenu.SelectionContext(),
        contentScript: 'self.on("click", function () {' +
                 '  var text = window.getSelection().toString();' +
                 '  self.postMessage(text);' +
                 '});',
        onMessage: function (selectionText) {
            alert(selectionText);
        }
    });
}
Even if my addon contains only one alert, the addon is installed but the alert is not shown.
exports.main = function() {
       alert("Hello world");
}
Extra info:
SDK: 1.14 (up to date) 
Add-on Builder Helper: 1.7 (up to date)  
Add On Builder Webpage: https://builder.addons.mozilla.org
 解决方案 
You cannot use alert directly in a lib/ module. There is simply no window that could display the alert and hence there is no alert function.
Have a look instead at the Logging documentation.
Should you really want to display something, you could e.g. use notifications, or alert using nsIPromptService (example on this page) or from within a content document (widget, etc).
Here is an example showing off different methods.
                        
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