self.port is undefined error [on mozilla add-on SDK 1.8]

问题

Following this guide, I did a little variation and I keep receiving this error:

self.port is undefined at base.js[my content code]

here my add-on code:

PageMod({
    include: [data.url('base.html')],
    contentScriptWhen: 'start',
    contentScriptFile: [data.url('jquery-1.7.2.min.js'),data.url('jquery-ui-1.8.21.custom.min.js'),data.url('base.js')],
    contentStyleFile: [data.url('css/mint-choc/jquery-ui-1.8.21.custom.css'),data.url('css/base.css')],
    onAttach: function(worker) {
            worker.port.on("request", function(txt) {
                console.log(txt);
                worker.port.emit("response","response for "+txt);
            });
    }
});

and my content code:

// initialized by jQuery
$(function() {
    self.port.on("response",function(txt){console.log("response "+txt);}) //this line is where the error point to.
    $('#tabs').tabs();
    testLoadLinks();
});

function testReceiveRequest(request) {
    console.log('received:',request);
    self.port.emit("request",request);
}

I'm using the browser editor with the SDK version 1.8, can someone please help me fix this?

回答1:

After some testing and debugging, I found out my two mistakes and i'm sorry i didn't put the whole code because I thought it wasn't related:

I had this in base.html

<link type="text/css" href="css/mint-choc/jquery-ui-1.8.21.custom.css" rel="stylesheet" />
<link type="text/css" href="css/base.css" rel="stylesheet" />
<script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>
<script type="text/javascript" src="js/jquery-ui-1.8.21.custom.min.js"></script>
<script type="text/javascript" src="js/base.js"></script>

and this on main.js

PageMod({
include: [data.url("base.html")],
contentScriptWhen: 'start',
contentScriptFile: [data.url('jquery-1.7.2.min.js'),data.url('jquery-ui-1.8.21.custom.min.js'),data.url('base.js')],
contentStyleFile: [data.url('css/mint-choc/jquery-ui-1.8.21.custom.css'),data.url('css/base.css')],
onAttach: function(worker) {
        console.log("attaching...")
        worker.port.on("request", function(txt) {
            console.log(txt);
            worker.port.emit("response","response for "+txt);
        });
}
});

My scripts are on the /data/js/ folder, they couldn't be found thus not loading the pageMod part of script in the main.js, but they were being loaded by the content script itself inside the DOM, where self.port is undefined. I just removed the script and styles tags from the base.html because they are already in the pageMod, and fixed the path in the data.url('js/base.js') and the others. Now i learned the scripts in the add-on scope can access the DOM scope and change it, but scripts inside the DOM cannot (they can?) communicate with the add-on scope. If you want scripts to interact with the add-on, you should left them in the add-on scope. I hope to help someone who commits the same mistake. Thanks canuckistani.

来源：https://stackoverflow.com/questions/11426406/self-port-is-undefined-error-on-mozilla-add-on-sdk-1-8

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