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; } ?>Detect if window.close() will work before using it (JavaScript) - Stack Overflow

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    Detect if window.close() will work before using it (JavaScript) - Stack Overflow

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    According to many rules and security features, window.close() will only work in specific cases:

    From the latest working spec for window.close():

    The close() method on Window objects should, if all the following conditions are met, close the browsing context A:

    • The corresponding browsing context A is script-closable.
    • The browsing context of the incumbent script is familiar with the browsing context A.
    • The browsing context of the incumbent script is allowed to navigate the browsing context A.

    A browsing context is script-closable if it is an auxiliary browsing context that was created by a script (as opposed to by an action of the user), or if it is a browsing context whose session history contains only one Document.

    I have a web application that allows users to close new windows and it works fine, except when the rules above are not respected.

    What I am looking for is to detect when the close() function will work and only show the close button in such case.

    I found information talking about window.opener that returns a reference from the window that opened it. But it doesn't work.

    if(window.opener != null){
//show button
}

    Maybe this is because the new window was opened using "right click -> open in new tab" and not a script. When tabs are opened in this fashion window.close() works, I just want to detect when window.close() will work.

    Any ideas?

    According to many rules and security features, window.close() will only work in specific cases:

    From the latest working spec for window.close():

    The close() method on Window objects should, if all the following conditions are met, close the browsing context A:

    • The corresponding browsing context A is script-closable.
    • The browsing context of the incumbent script is familiar with the browsing context A.
    • The browsing context of the incumbent script is allowed to navigate the browsing context A.

    A browsing context is script-closable if it is an auxiliary browsing context that was created by a script (as opposed to by an action of the user), or if it is a browsing context whose session history contains only one Document.

    I have a web application that allows users to close new windows and it works fine, except when the rules above are not respected.

    What I am looking for is to detect when the close() function will work and only show the close button in such case.

    I found information talking about window.opener that returns a reference from the window that opened it. But it doesn't work.

    if(window.opener != null){
//show button
}

    Maybe this is because the new window was opened using "right click -> open in new tab" and not a script. When tabs are opened in this fashion window.close() works, I just want to detect when window.close() will work.

    Any ideas?

    • javascript
    • window
    Share Improve this question edited Jun 1, 2018 at 19:43 Eduardo Ponce de Leon asked May 29, 2018 at 20:12 Eduardo Ponce de LeonEduardo Ponce de Leon 9,70613 gold badges55 silver badges86 bronze badges
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    2 Answers 2

    Reset to default 12

    According to the docs, the window is script-closable also if session history of the given context is of length 1 (which is exactly what happens when you open a link in a new tab/window). You need to add that to your checker.

    if(window.opener != null || window.history.length == 1){
//show button
}

    As I understand it, there isn't a native way to do this. It is possible to check if window.close() has failed after the fact by checking if window.closed is false to detect an error. See here.

    Your only option is to offer the functionality to close every window, or try to in all cases, and ask the user to close it manually if it fails - otherwise it cannot be closed by you, or any of your code, by definition. There isn't a way around that unfortunately. One option that might be worth trying would be to redirect them somewhere if the window cannot be closed programmatically, which you can verify easily after every attempt.

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