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; } ?>javascript - Vertical centering variable height image while maintaining max-widthheight - Stack Overflow

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    javascript - Vertical centering variable height image while maintaining max-widthheight - Stack Overflow

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    I want to center an image of unknown width/height on a page, while making sure that it shrinks if it is bigger than the page (i.e. use max-width/max-height).

    I tried using the display:table-cell method, but max-width is ignored in Firefox for all elements within elements declared with display:table-cell. Is there a way to vertically center a variable-height element without using display:table-cell?

    I can change the mark up. JavaScript is acceptable, but I cannot use JQuery (or any other JS library).

    I want to center an image of unknown width/height on a page, while making sure that it shrinks if it is bigger than the page (i.e. use max-width/max-height).

    I tried using the display:table-cell method, but max-width is ignored in Firefox for all elements within elements declared with display:table-cell. Is there a way to vertically center a variable-height element without using display:table-cell?

    I can change the mark up. JavaScript is acceptable, but I cannot use JQuery (or any other JS library).

    • javascript
    • css
    • vertical-alignment
    Share Improve this question asked Jun 8, 2011 at 17:42 Oliver ZhengOliver Zheng 8,19911 gold badges54 silver badges61 bronze badges
    Add a ment  | 

    3 Answers 3

    Reset to default 17

    This should prove to work quite well... no JavaScript necessary :)

    See the working demo on jsFiddle.

    CSS

    /* Don't Change - Positioning */
.absoluteCenter {
 margin:auto;
 position:absolute;
 top:0;
 bottom:0;
 left:0;
 right:0;
}

/* Sizing */
img.absoluteCenter {
 max-height:100%;
 max-width:100%;
}

    HTML

    <img class="absoluteCenter" src="PATHTOIMAGE">

    Note: This class can be used for anything quite easily. If you use this for something other than an image, make sure to add a TAG.absoluteCenter CSS rule with a max-height and max-width of your choosing (where TAG is the HTML tag you're using [e.g. div.absoluteCenter] and max-width/max-height is less than 100%).

    Try something like this...

    Demo: http://jsfiddle/wdm954/jYnk8/1/

    $(function() {

    h = $('.img').height();
    w = $(window).height();

    if (h < w) { 
        $('.img').css('margin-top', (w - h) /2 + "px");
    }
    else {
        $('.img').height(w);
    }

});

    (You can test different sizes by changing some CSS I have mented out.)

    Here is one way with javascript:

    <html>
<head>
<style>
  html, body{
    height:100%;
    margin:0;
    border:0;
    padding:0;
    background:#000;
  }
  body{
    position:relative;
  }
  img{
    border:0;
    padding:0;
    margin:0 auto;
    max-width:100%;
    max-height:100%;
    display:block;
    position:absolute;
  }
</style>
</head>
<body>
  <img />
  <script>
    (function(){
      var imgs = [
          'http://farm3.static.flickr./2396/2078094921_ee60c42d0f.jpg',
          'http://farm6.static.flickr./5242/5353846171_9169f810dc_b.jpg',
          'http://farm6.static.flickr./5284/5336493514_8e41696b66_b.jpg'
        ],
        img = document.getElementsByTagName('IMG')[0],
        getStyle = function(elm){
          return window.getComputedStyle ? window.getComputedStyle(elm) : elm.currentStyle;
        },
        bodyStyle = getStyle(document.body),
        toInt = function(pxSize){
          return +pxSize.replace(/px/,'');
        },
        chgImg = function(){
          img.src = imgs[i++ % imgs.length];
          img.onload = function(){
            var imgStyle = getStyle(img);
            img.style.left = ( toInt(bodyStyle.width)  - toInt(imgStyle.width) ) / 2 + 'px';
            img.style.top =  ( toInt(bodyStyle.height) - toInt(imgStyle.height) ) / 2 + 'px';
            img.onload = null;
          };
        },
        i = 0;

      chgImg();
      setInterval(chgImg, 3000);
    })();
  </script>
</body>
</html>​

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