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 - Check for empty attribute jquery - Stack Overflow

科技改变生活-雨落星辰 - 所有的伟大,都源于一个勇敢的开始

    最新消息：雨落星辰是一个专注网站SEO优化、网站SEO诊断、搜索引擎研究、网络营销推广、网站策划运营及站长类的自媒体原创博客
    你的位置： 首页>programmer>javascript - Check for empty attribute jquery - Stack Overflow

    javascript - Check for empty attribute jquery - Stack Overflow

    programmeradmin6浏览0评论

    I'm trying to check an element for an empty attribute, but can't seem to get things to work.

    Here's my html code:

        <div class="item">
        <div class="itemBtn" style="visibility:hidden;">
        </div>
        <div class="itemText" itemtype="loader">
        </div>
    </div>  
    <div class="item">
        <div class="itemBtn">
        </div>
        <div class="itemText" itemtype="">
        </div>
    </div>

    Here's a jquery hover function that essentially just turns on the button. I was trying to build upon it by saying 'if theres no itemtype, dont turn it on'

        inner.find(".item").hover(function () {
        if (inner.find(".item-text[itemtype='']")) {
            $(this).children(".itemBtn").css("visibility", "hidden");
        } else {
            $(this).children(".itemBtn").css("visibility", "visible");
        }
     }, function () {
        $(this).children(".itemBtn").css("visibility", "hidden");
     });

    UPDATE: I ended up solving this by doing the following:

        inner.find(".item").hover(function () {
         if ($(this).find("div[itemtype='']").length) {
           $(this).children(".itemBtn").css("visibility", "hidden");
         } else {
           $(this).children(".itemBtn").css("visibility", "visible");
         }
         }, function () {
           $(this).children(".itemBtn").css("visibility", "hidden");
         });

    I'm trying to check an element for an empty attribute, but can't seem to get things to work.

    Here's my html code:

        <div class="item">
        <div class="itemBtn" style="visibility:hidden;">
        </div>
        <div class="itemText" itemtype="loader">
        </div>
    </div>  
    <div class="item">
        <div class="itemBtn">
        </div>
        <div class="itemText" itemtype="">
        </div>
    </div>

    Here's a jquery hover function that essentially just turns on the button. I was trying to build upon it by saying 'if theres no itemtype, dont turn it on'

        inner.find(".item").hover(function () {
        if (inner.find(".item-text[itemtype='']")) {
            $(this).children(".itemBtn").css("visibility", "hidden");
        } else {
            $(this).children(".itemBtn").css("visibility", "visible");
        }
     }, function () {
        $(this).children(".itemBtn").css("visibility", "hidden");
     });

    UPDATE: I ended up solving this by doing the following:

        inner.find(".item").hover(function () {
         if ($(this).find("div[itemtype='']").length) {
           $(this).children(".itemBtn").css("visibility", "hidden");
         } else {
           $(this).children(".itemBtn").css("visibility", "visible");
         }
         }, function () {
           $(this).children(".itemBtn").css("visibility", "hidden");
         });
    • javascript
    • jquery
    • attributes
    Share Improve this question edited Jun 25, 2014 at 12:44 jessikwa asked Jun 24, 2014 at 21:19 jessikwajessikwa 7501 gold badge8 silver badges24 bronze badges 2
    • And? What happens when you run the code? – Bluefire Commented Jun 24, 2014 at 21:20
    • You should use .attr() and conditionally check it. – Christopher Marshall Commented Jun 24, 2014 at 21:21
    Add a ment  | 

    4 Answers 4

    Reset to default 4

    it's just simple example

    var attr = $(this).attr('title');
if (typeof attr !== typeof undefined && attr !== false) {
    //do some thing
}

    Use .attr like this with a conditional:

    var attr = $(this).attr('title');
if (!attr) {
    // Do something
}

    Or you can make it more concise by checking the attribute in the conditional like this:

    if (!$(this).attr('title')) {
    // Do something
}

    if (! $('.item-text').attr('itemtype') ) {
    alert("Nothing in itemtype");
} else {
    alert("Not empty");
}

    Very simple, just check to see if the attribute exists or not using attr(), like so:

    if (!$(this).attr('title')) {
    alert('Exists!');
}

    与本文相关的文章

    发布评论

    评论列表(0)

    1. 暂无评论