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 - Scroll event never fires and .scrollTop() always returns 0 because of wrapper DIV - Stack Overflow
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javascript - Scroll event never fires and .scrollTop() always returns 0 because of wrapper DIV - Stack Overflow

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Basically what I'm trying to do is use a on scroll event and use jquery scrollTop() while using this [off-canvas menu][1]

Here's a fiddle! /

Here's the code that isn't working as expected: (The scroll event never fires and scrollTop() always returns as 0)

$( window ).on('scroll', function() {
  console.log($(window).scrollTop());
  console.log('scrolling!');
});

My understanding is that because the off-canvas menu uses a relatively positioned wrapper div, the scroll event never fires because $(window).scrollTop() always returns zero.

How can I make a scroll event work and use scrollTop() ?

Basically what I'm trying to do is use a on scroll event and use jquery scrollTop() while using this [off-canvas menu][1]

Here's a fiddle! http://jsfiddle/k6hsvp1a/

Here's the code that isn't working as expected: (The scroll event never fires and scrollTop() always returns as 0)

$( window ).on('scroll', function() {
  console.log($(window).scrollTop());
  console.log('scrolling!');
});

My understanding is that because the off-canvas menu uses a relatively positioned wrapper div, the scroll event never fires because $(window).scrollTop() always returns zero.

How can I make a scroll event work and use scrollTop() ?

Share Improve this question edited Oct 20, 2014 at 16:46 Chava Sobreyra asked Oct 20, 2014 at 15:31 Chava SobreyraChava Sobreyra 8611 gold badge9 silver badges21 bronze badges 3
  • create a fiddle please – Jonas Grumann Commented Oct 20, 2014 at 15:39
  • scroll what? scrollTop of what? Question is far too vague. Where's your code attempt that isn't working? – charlietfl Commented Oct 20, 2014 at 15:49
  • Sorry guys, I added a fiddle and some clarification! – Chava Sobreyra Commented Oct 20, 2014 at 16:14
Add a ment  | 

2 Answers 2

Reset to default 7

Debugging time... this is a little heavy handed, but worked in this scenario:

$("*").on('scroll', function() {
  console.log($(this));
});

The "*" applies to all elements.

Checked out the console:

[div.st-content, context: div.st-content, jquery: "1.9.1", constructor: function, init: function, selector: ""…]

So our scroll event is being triggered by .st-content

$(".st-content").on('scroll', function() {
  console.log($(this).scrollTop());
  console.log("scrolling");
});

Your fiddle is fiddling with the wrong container. Check my update here:

http://jsfiddle/k6hsvp1a/1/

This is the difference:

$( '.st-content' ).on('scroll', function() {
  console.log($('.st-content').scrollTop());
  console.log('scrolling!');
});

Every block element can scroll independently if its contents are larger than its dimensions and set to overflow: scroll (or overflow: auto (or overflow-y or... you get the point)).

The scroll event then fires on the actual div that's scrolling, and doesn't bubble up to the window. (https://developer.mozilla/en-US/docs/Web/Events/scroll)

What's also confusing is that this div in particular also happens to take up the whole window, so it looks like it's the window that's scrolling.

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