为什么我的非常简单的Chrome扩展程序可以在Mac上运行而不是PC？

Question

I have written a very simple Chrome extension. It consists of this background page:

<script type="text/javascript">

chrome.tabs.onDetached.addListener(function(tabId, info){
    var id = tabId;
    chrome.tabs.get(id, function(tab) {
        chrome.tabs.create({
            windowId : info.oldWindowId, 
            index : info.oldPosition, 
            url : tab.url
        });
    });
});

</script>

All it does is allows you to pull a tab from a window without losing that tab and web address from the window. It basically duplicates the tab when you detach it.

The problem is that this works perfectly on a Mac but when I have tried it on two different Windows machines I get this error

background.html:7Uncaught TypeError: Cannot read property 'url' of undefined

It appears the tab object isn't being passed into the get callback. Does anyone know why this might be? It obviously is when I run the code on a Mac.

Answer 1

So this is the only workaround that I can think of:

1. OnDetached - store id of tab and also its window id
2. OnAttached - check whether tab id matches stored tab id AND that window id is now different. If so then create new tab in the old window.

Behavior does seem wonky. Perhaps file a bug report?

Answer 2

The problem is tab id changes after it is detached (old one doesn't exist anymore). Not sure whether it is an error or feature, but if it is inconsistent between Mac and PC then it is definitely an error (could be just performance difference - api method executes faster than tab detaches on a different computer).

mrtsherman was on right track with workaround, only instead of saving id you should save info as that id doesn't mean anything anymore. Then you would have all information to recreate a tab (use attached info to get tab id, and saved detached info to get old position and window).