te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>javascript - Please Explain Background Communication with Google Chrome Extensions - Stack Overflow

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    javascript - Please Explain Background Communication with Google Chrome Extensions - Stack Overflow

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    I have read and re-read this page, as well as run the samples:

    .html

    But I don't seem to grasp how to do the background munication between the background.html, popup.html, and content.js. I want to send messages to trigger functions, get responses, and process those responses. The map sample was sort of close to helping me, but I just need something super simple and not need all that map stuff. (Note, I know jQuery as well as Javascript, so feel free to mix in a bit of jQuery if you want.)

    I have read and re-read this page, as well as run the samples:

    http://code.google./chrome/extensions/background_pages.html

    But I don't seem to grasp how to do the background munication between the background.html, popup.html, and content.js. I want to send messages to trigger functions, get responses, and process those responses. The map sample was sort of close to helping me, but I just need something super simple and not need all that map stuff. (Note, I know jQuery as well as Javascript, so feel free to mix in a bit of jQuery if you want.)

    • javascript
    • ipc
    • google-chrome-extension
    Share Improve this question asked Jan 20, 2011 at 4:48 VolomikeVolomike 24.9k22 gold badges124 silver badges217 bronze badges 1
    • Related: Contexts and methods for munication between the browser action, background scripts, and content scripts of chrome extensions? – Rob W Commented Jan 13, 2014 at 21:40
    Add a ment  | 

    1 Answer 1

    Reset to default 19

    All extension pages (background page, popup, infobar, page action all run inside the same extension. Think of it as a webpage with one domain. And that domain is your extension ID. Each one of those extension pages is like a regular page (similar when you develop a website).

    All extension pages (mentioned above) can municate with each other easily, you have multiple ways doing so:

    1. chrome.extension.getBackgroundPage()

      You do it directly! I use this approach whenever I can. Its cleaner in my opinion.

      var bkg = chrome.extension.getBackgroundPage();`  
bkg.ping();`

    2. chrome.extension.onRequest.addListener and chrome.extension.sendRequest

      As shown below, you can use extension messaging to pass information as well. I use this approach when I want it to be event oriented. I rarely use this within extension pages.

      popup.html

      chrome.extension.sendRequest({method: 'ping'}, function(response) {
   // response.result
});

      background_page.html

      chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
    if (request.method == 'ping') {
        sendResponse({result: 'pong'});
    }
});

    Now there is a difference between "Extension Pages" and "Content Scripts". Please read that document carefully to understand it. A content script is not a extension page, you cannot do what extension pages do. You cannot directly municate to any of those pages mentioned above. Content Scripts are JavaScript files that run in the context of web pages, not extension pages. Thats an important distinction to recognize.

    So in order to municate between your extension pages and content script, you need to use Messaging. That page has a lot of information, I highly remend you to read it. It is very similar to how we used messaging (step 2 above), but the only different is how you send a request. You would need to use chrome.tabs.sendRequest, because you need to send a single request to the content script from your extension page (background, popup, page, etc). You would need to know the ID of your tab in order to do that. Please look at the Tab API for more info.

    If your extension municates with your content script very often, you can use Long Lived connections, which is explained pretty well in the Messaging section I liked above.

    I have answered many questions and other people too regarding similar questions. Since your experienced in JavaScript, I highly remend you to read the documentation, it has everything you need. Read the API, and I hope I you now understand the difference between Content Script and Extension Pages, and the munication between them is through Extension Messaging.

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