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 - How to make a sticky navbar without JS? - Stack Overflow

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    javascript - How to make a sticky navbar without JS? - Stack Overflow

    programmeradmin7浏览0评论

    I want to create a sticky navbar. It should float over the content during scrolling, and should be displayed before the content if the page is scrolled to the top.

    My implementation has almost worked but the part of the content was overlapped by the navbar when the page was scrolled to the top.

    I managed to get it to work with JS by updating the padding-top CSS property of #content every time the window size is changed (see the fixContentPadding function).

    Can this be done without JS?

    Here is an example:

    function fixContentPadding() {
  const navbarElement = document.getElementById("navbar");
  const contentElement = document.getElementById("content");

  contentElement.style.paddingTop = navbarElement.offsetHeight + "px";
}

document.addEventListener("resize", fixContentPadding);
document.addEventListener("DOMContentLoaded", fixContentPadding);
    #navbar {
  position: fixed;
  top: 0;
  z-index: 1;
  width: 100%;
  background: lightblue;
}

#content {
  min-height: 200vh;  /* to demonstrate scrolling */
  border: 1px solid lightblue;
}
    <div id="navbar">
  <a href="/">Hello, World!</a>
</div>

<div id="content">
  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea modo consequat. Duis aute irure dolor
  in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</div>

    I want to create a sticky navbar. It should float over the content during scrolling, and should be displayed before the content if the page is scrolled to the top.

    My implementation has almost worked but the part of the content was overlapped by the navbar when the page was scrolled to the top.

    I managed to get it to work with JS by updating the padding-top CSS property of #content every time the window size is changed (see the fixContentPadding function).

    Can this be done without JS?

    Here is an example:

    function fixContentPadding() {
  const navbarElement = document.getElementById("navbar");
  const contentElement = document.getElementById("content");

  contentElement.style.paddingTop = navbarElement.offsetHeight + "px";
}

document.addEventListener("resize", fixContentPadding);
document.addEventListener("DOMContentLoaded", fixContentPadding);
    #navbar {
  position: fixed;
  top: 0;
  z-index: 1;
  width: 100%;
  background: lightblue;
}

#content {
  min-height: 200vh;  /* to demonstrate scrolling */
  border: 1px solid lightblue;
}
    <div id="navbar">
  <a href="/">Hello, World!</a>
</div>

<div id="content">
  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea modo consequat. Duis aute irure dolor
  in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</div>

    • javascript
    • html
    • css
    • navbar
    Share Improve this question edited Dec 17, 2021 at 2:27 demian-wolf asked Aug 17, 2020 at 21:07 demian-wolfdemian-wolf 1,8683 gold badges19 silver badges35 bronze badges 1
    • have you tried adding margin-top: ; to the #content element? From what I understood you just want a way to separate content from navbar right? – Yuran Pereira Commented Aug 17, 2020 at 21:20
    Add a ment  | 

    3 Answers 3

    Reset to default 6

    This is what position: sticky is for:

    #navbar {
  position: sticky;
  top: 0;
  background: aliceblue;
}
    <div id="navbar">
  <a href="/">Hello, World!</a>
</div>

<div id="content-container">
  <div id="content">
    <p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p>
  </div>
</div>

    A margin-top on your div#content-container ?

    #navbar {
  width: 100%;
  background-color: lightblue;
  color: white;
  top: 0;
  position: fixed;
  z-index: 1;
}

#navbar *:hover {
  background-color: #2196F3;
  border-radius: 32px;
}

#navbar * {
  float: left;
  text-decoration: none;
}

#content-container {
  margin-top:40px;
}

#content {
  width: 90%;
  margin: auto;
  word-wrap: break-word;
  padding: 0.01em 16px;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.16), 0 2px 10px 0 rgba(0, 0, 0, 0.12)
}
    <div id="navbar">
  <a href="/">Hello, World!</a>
</div>

<div id="content-container">
  <div id="content">
    <p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p>
  </div>
</div>

    function fixContentPadding() {
  document.getElementById("content-container").style.paddingTop = document.getElementById("navbar").offsetHeight + 15 + "px";
}
window.onresize = fixContentPadding;
fixContentPadding();
    #navbar {
  width: 100%;
  height: 3em;
  background-color: lightblue;
  color: white;
  position: fixed;
  top: 0;
  z-index: 1;
}

#navbar *:hover {
  background-color: #2196F3;
  border-radius: 32px;
}

#navbar * {
  float: left;
  text-decoration: none;
}

#content {
  width: 90%;
  margin: 3em auto auto auto;
  word-wrap: break-word;
  padding: 0.01em 16px;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.16), 0 2px 10px 0 rgba(0, 0, 0, 0.12)
}
    <div id="navbar">
  <a href="/">Hello, World!</a>
</div>

<div id="content-container">
  <div id="content">
    <p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p><p>Hello, World!</p>
  </div>
</div>

    add a margin-top to the content div equal or alrger of the navbar hight.

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