Mozilla 插件开发 - windows 与不同域之间的通信

Question

我正在尝试创建一个插件，允许用户随意查询词典站点并查看所选单词的定义。我一直在努力寻找一种方法来在我必须访问字典站点条目的 DOM 的页面工作者和用户正在查看的主页之间进行通信。我知道页面工作者能够从 DOM 中抓取定义，因为我能够看到记录到控制台的定义。我在让 postMessage 和 onMessage 合作时遇到问题。我目前正在尝试使用 iframe 弥合差距，但欢迎使用其他方法。

这是我的一些代码...

index.js:

var getDefinition = "var def = document.getElementsByClassName('def-content');" +
                    "definition = def[0].textContent;" +
                    "word = document.getElementsByClassName('js-headword');" +
                    "word = word.textContent;" +
                    "self.port.emit('dialog', definition);" +
                    "var thiswin = document.getElementById('example').contentWindow;" +
                    "thiswin.postMessage(definition, '*');"

currPage = require("sdk/page-mod").PageMod({
    include: "*",
    contentScriptWhen: "ready",
    contentScriptFile: [
        data.url("jquery.js"),
        data.url("jquery-ui.min.js"),
        data.url("define.js"),
    ],
    onMessage: function(message){
        console.log("received message");
    },
    onAttach: function(worker){
        workers.push(worker);

        worker.on("message", function(definition){
            console.log("received message");
        });

        worker.port.on("dblclick", function(selected, thispage){
            newPage = require("sdk/page-worker").Page({
                contentURL: "http://dictionary.reference.com/browse/" + selected,
                contentScriptWhen: "ready",
                contentScriptFile: [
                    data.url("jquery.js"),
                    data.url("jquery-ui.min.js"),
                    data.url("iframe.js")
                ],
                contentScript: getDefinition,
                onMessage: function(message){
                    console.log("received message");
                }
            });
        });
    }
});

define.js:

function calldictionary(definition){
    console.log("here comes calldictionary");
    console.log(definition);
    $('div#definition').text(definition);
    $('#define').dialog("open");
}

function send(){
    var selected = getSelected();
    if (selected != ""){
        var mainwin = document.getElementById('example').contentWindow;
        $('iframe#example').attr('src', 'http://dictionary.reference.com/browse/' + selected);
        self.port.emit("dblclick", selected);
    }
}

function getSelected() {
    if (window.getSelection) {
        return window.getSelection().toString();
    } else if (document.selection) {
        return document.selection.createRange().text;
    }
    return '';
}

$(window).dblclick(function() {
    send();
});

window.addEventListener("message", function(event){
    if (event.origin == "dictionary.reference.com"){
    console.log("received message");}
    }, false);

Answer 1

您混淆了常规 window 消息与 content script messaging。试试这个：

index.js

var getDefinition = "var def = document.getElementsByClassName('def-content');" +
                    "definition = def[0].textContent;" +
                    "word = document.getElementsByClassName('js-headword');" +
                    "word = word.textContent;" +
                    "self.port.emit('dialog', definition);";

currPage = require("sdk/page-mod").PageMod({
    include: "*",
    contentScriptWhen: "ready",
    contentScriptFile: [
        data.url("jquery.js"),
        data.url("jquery-ui.min.js"),
        data.url("define.js"),
    ],
    onMessage: function(message){
        console.log("received message");
    },
    onAttach: function(worker){
        workers.push(worker);

        worker.on("message", function(definition){
            console.log("received message");
        });

        worker.port.on("dblclick", function(selected, thispage){
            newPage = require("sdk/page-worker").Page({
                contentURL: "http://dictionary.reference.com/browse/" + selected,
                contentScriptWhen: "ready",
                contentScriptFile: [
                    data.url("jquery.js"),
                    data.url("jquery-ui.min.js"),
                    data.url("iframe.js")
                ],
                contentScript: getDefinition,
                onMessage: function(message){
                    worker.postMessage(message);
                }
            });
        });
    }
});

define.js:

function calldictionary(definition){
    console.log("here comes calldictionary");
    console.log(definition);
    $('div#definition').text(definition);
    $('#define').dialog("open");
}

function send(){
    var selected = getSelected();
    if (selected != ""){
        self.port.emit("dblclick", selected);
    }
}

function getSelected() {
    if (window.getSelection) {
        return window.getSelection().toString();
    } else if (document.selection) {
        return document.selection.createRange().text;
    }
    return '';
}

$(window).dblclick(function() {
    send();
});

self.on("message", function(message){
    console.log("received message");}
});

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