权限没有，则隐藏 function forum_list_access_filter($forumlist, $gid, $allow = 'allowread') { global $grouplist; if (empty($forumlist)) return array(); if (1 == $gid) return $forumlist; $forumlist_filter = $forumlist; $group = $grouplist[$gid]; foreach ($forumlist_filter as $fid => $forum) { if (empty($forum['accesson']) && empty($group[$allow]) || !empty($forum['accesson']) && empty($forum['accesslist'][$gid][$allow])) { unset($forumlist_filter[$fid]); } unset($forumlist_filter[$fid]['accesslist']); } return $forumlist_filter; } function forum_filter_moduid($moduids) { $moduids = trim($moduids); if (empty($moduids)) return ''; $arr = explode(',', $moduids); $r = array(); foreach ($arr as $_uid) { $_uid = intval($_uid); $_user = user_read($_uid); if (empty($_user)) continue; if ($_user['gid'] > 4) continue; $r[] = $_uid; } return implode(',', $r); } function forum_safe_info($forum) { //unset($forum['moduids']); return $forum; } function forum_filter($forumlist) { foreach ($forumlist as &$val) { unset($val['brief'], $val['announcement'], $val['seo_title'], $val['seo_keywords'], $val['create_date_fmt'], $val['icon_url'], $val['modlist']); } return $forumlist; } function forum_format_url($forum) { global $conf; if (0 == $forum['category']) { // 列表URL $url = url('list-' . $forum['fid'], '', FALSE); } elseif (1 == $forum['category']) { // 频道 $url = url('category-' . $forum['fid'], '', FALSE); } elseif (2 == $forum['category']) { // 单页 $url = url('read-' . trim($forum['brief']), '', FALSE); } if ($conf['url_rewrite_on'] > 1 && $forum['well_alias']) { if (0 == $forum['category'] || 1 == $forum['category']) { $url = url($forum['well_alias'], '', FALSE); } elseif (2 == $forum['category']) { // 单页 $url = ($forum['threads'] && $forum['brief']) ? url($forum['well_alias'] . '-' . trim($forum['brief']), '', FALSE) : url($forum['well_alias'], '', FALSE); } } return $url; } function well_forum_alias() { $forumlist = forum_list_cache(); if (empty($forumlist)) return ''; $key = 'forum-alias'; static $cache = array(); if (isset($cache[$key])) return $cache[$key]; $cache[$key] = array(); foreach ($forumlist as $val) { if ($val['well_alias']) $cache[$key][$val['fid']] = $val['well_alias']; } return array_flip($cache[$key]); } function well_forum_alias_cache() { global $conf; $key = 'forum-alias-cache'; static $cache = array(); // 用静态变量只能在当前 request 生命周期缓存，跨进程需要再加一层缓存：redis/memcached/xcache/apc if (isset($cache[$key])) return $cache[$key]; if ('mysql' == $conf['cache']['type']) { $arr = well_forum_alias(); } else { $arr = cache_get($key); if (NULL === $arr) { $arr = well_forum_alias(); !empty($arr) AND cache_set($key, $arr); } } $cache[$key] = empty($arr) ? '' : $arr; return $cache[$key]; } ?>javascript - jQuery - Find first div with specific ID inside a Div? - Stack Overflow

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    javascript - jQuery - Find first div with specific ID inside a Div? - Stack Overflow

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    So my code always follows the same kind of format:

    <div id="container">
  <div id="firstDiv">
  </div>
</div>

    Sometimes it's like this (and this is what I want to ignore):

    <div id="container">
  <div id="banner">
  </div>

  <div id="firstDiv">
  </div>
</div>

    So what I want to do is

    IF the first div inside #container is equal to #firstDiv - add a banner. else (there's already a banner there) do nothing.

    Any help with this would be great!!

    Thanks!!

    So my code always follows the same kind of format:

    <div id="container">
  <div id="firstDiv">
  </div>
</div>

    Sometimes it's like this (and this is what I want to ignore):

    <div id="container">
  <div id="banner">
  </div>

  <div id="firstDiv">
  </div>
</div>

    So what I want to do is

    IF the first div inside #container is equal to #firstDiv - add a banner. else (there's already a banner there) do nothing.

    Any help with this would be great!!

    Thanks!!

    • javascript
    • jquery
    Share Improve this question asked Oct 2, 2014 at 15:53 NickNick 2,5595 gold badges39 silver badges72 bronze badges
    Add a ment  | 

    6 Answers 6

    Reset to default 4

    You can do that:

    if($('#container > div:first').attr('id') == 'banner') {
    //banner exists
} else {
   //banner not exists
}

    Use a child selector:

    div#container > div#firstDiv

    You can

    $('#firstDiv:first-child').before('<div class="banner">banner</div>');
$('#firstDiv2:first-child').before('<div class="banner">banner</div>');
    <script src="https://ajax.googleapis./ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="container">
  <div id="firstDiv">Div</div>
</div>

<div id="container2">
  <div id="banner">Banner</div>
  <div id="firstDiv2">Div</div>
</div>

    Try this:

    if($("#container").find("#banner").lenght == 0){
    // You have the banner
}else{
    // you dont`n have the banner
}

    try this:

    (function(){

      if(!$('#firstDiv','#container').length){
           $('#container').prepend(jQuery('<div id="firstDiv">'));
     }

})(jQuery);

    With the children() selector you get all the children element of #container. With the first() you get the first one, and with attr('id') you get the id name.

    Then you just have to check what id name you have

    Example:

    if($("#container").children().first().attr('id') != "banner"){
     addBanner();
}

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