使用上下文菜单和端口
我在 阅读使用内容脚本，可以将端口与上下文菜单一起使用，但以下代码给我一个错误：cm.port 未定义。当我发出事件时，相同的代码适用于 require("panel") ，但不适用于上下文菜单。我做错了什么？
这是main.js
const data = require('self').data;
var cm = require("context-menu").Item({
label: "asdasd",
contentScriptFile: data.url("panel.js")
});
cm.port.emit("myEvent", "panel is showing");
这个panel.js
console.log("entering the panel.js file...");
self.on("click", function(node,data) {
self.port.emit("asd");
});
self.port.on("myEvent", function(data) {
console.log(data);
});
I read at working with content scripts that one can use port with context-menu, but the following code gives me an error: cm.port is undefined. The same code works with require("panel") when I emit an event, but not with context menu. What am doing wrong?
This is main.js
const data = require('self').data;
var cm = require("context-menu").Item({
label: "asdasd",
contentScriptFile: data.url("panel.js")
});
cm.port.emit("myEvent", "panel is showing");
this panel.js
console.log("entering the panel.js file...");
self.on("click", function(node,data) {
self.port.emit("asd");
});
self.port.on("myEvent", function(data) {
console.log(data);
});
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引用 文档：
您使用的既不是
panel也不是page-worker而是上下文菜单。并且context-menu包不允许与内容脚本进行双向通信。同样，如果您查看 文档：您只能接收内容脚本发送的消息，但不能向其发送消息。相反，消息context和click会在适当的情况下自动发送到内容脚本。To quote the documentation:
What you are using is neither
panelnorpage-workerbutcontext-menu. And thecontext-menupackage doesn't allow bi-directional communication with the content script. Again, if you look at the documentation: you can only receive messages sent by the content script but not send messages to it. Instead, the messagescontextandclickare sent to the content script automatically in appropriate situations.参考：https://developer.mozilla.org/ en-US/Add-ons/SDK/Guides/Content_Scripts/using_postMessage
Refer to:https://developer.mozilla.org/en-US/Add-ons/SDK/Guides/Content_Scripts/using_postMessage