css - 垂直对齐 : middle

Question

我想将 img 元素放在 div.partners-slider 的中间。这是一个响应式 slider ，我无法设置固定高度。有什么建议吗？

jsfiddle

HTML

    <div class="ps-wrap"><div class="partners-slider">
<div class="pslide"><img src="http://server-pps.com/img/gwiazda_sponsor.png" /></div>  
<div class="pslide"><img src="http://www.sundance.org/images/support-us/HPActivitiesLogo50x50.png" /></div> 
<div class="pslide"><img src="http://t2.gstatic.com/images?q=tbn:ANd9GcQvsT_kxUqdhOoo7zSTkbQ76PLgx4ZRucUZcbf2KsrY0bFbu30agw" /></div> 
    <div class="pslide"><img src="http://i.cdn.turner.com/dr/nba/teamsites-nbateams/release/nets/sites/nets/files/content/images-gallery/2013/07/twitterimage-updated.jpg?1374006700" /></div> 
</div></div>

JS

    $(document).ready(function() {
$('.partners-slider').bxSlider({
slideWidth: 924,
        auto: 0,
        autoStart: 0,
        moveSlides: 1,
        minSlides: 3,
        maxSlides: 8,
        pager: false,
        slideMargin: 5
  });
 });

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e=parseInt(o.active.index)-1;r.goToSlide(e,"prev")}},r.startAuto=function(e){o.interval||(o.interval=setInterval(function(){"next"==o.settings.autoDirection?r.goToNextSlide():r.goToPrevSlide()},o.settings.pause),o.settings.autoControls&&1!=e&&q("stop"))},r.stopAuto=function(e){o.interval&&(clearInterval(o.interval),o.interval=null,o.settings.autoControls&&1!=e&&q("start"))},r.getCurrentSlide=function(){return o.active.index},r.getSlideCount=function(){return o.children.length},$("#main-content").resize(function(){r.redrawSlider()}),r.redrawSlider=function(){o.children.add(r.find(".bx-clone")).width(p()),o.viewport.css("height",h()),o.settings.ticker||m(),o.active.last&&(o.active.index=f()-1),o.active.index>=f()&&(o.active.last=!0),o.settings.pager&&!o.settings.pagerCustom&&(b(),M(o.active.index))},r.destroySlider=function(){o.initialized&&(o.initialized=!1,e(".bx-clone",this).remove(),o.children.removeAttr("style"),this.removeAttr("style").unwrap().unwrap(),o.controls.el&&o.controls.el.remove(),o.controls.next&&o.controls.next.remove(),o.controls.prev&&o.controls.prev.remove(),o.pagerEl&&o.pagerEl.remove(),e(".bx-caption",this).remove(),o.controls.autoEl&&o.controls.autoEl.remove(),clearInterval(o.interval))},r.reloadSlider=function(e){void 0!=e&&(s=e),r.destroySlider(),d()},d(),this}}})(jQuery),function(e,t){var i="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";e.fn.imagesLoaded=function(n){function s(){var t=e(g),i=e(h);a&&(h.length?a.reject(d,t,i):a.resolve(d)),e.isFunction(n)&&n.call(r,d,t,i)}function o(t,n){t.src===i||-1!==e.inArray(t,c)||(c.push(t),n?h.push(t):g.push(t),e.data(t,"imagesLoaded",{isBroken:n,src:t.src}),l&&a.notifyWith(e(t),[n,d,e(g),e(h)]),d.length===c.length&&(setTimeout(s),d.unbind(".imagesLoaded")))}var r=this,a=e.isFunction(e.Deferred)?e.Deferred():0,l=e.isFunction(a.notify),d=r.find("img").add(r.filter("img")),c=[],g=[],h=[];return e.isPlainObject(n)&&e.each(n,function(e,t){"callback"===e?n=t:a&&a[e](t)}),d.length?d.bind("load.imagesLoaded error.imagesLoaded",function(e){o(e.target,"error"===e.type)}).each(function(n,s){var r=s.src,a=e.data(s,"imagesLoaded");a&&a.src===r?o(s,a.isBroken):s.complete&&s.naturalWidth!==t?o(s,0===s.naturalWidth||0===s.naturalHeight):(s.readyState||s.complete)&&(s.src=i,s.src=r)}):s(),a?a.promise(r):r}}(jQuery);

CSS

    img.tab-ico {
    position: absolute;
    left: 6px;
    top: 50%;
    margin-top: -12px;

}

.partners-slider {
height: 100%;
}

div.pslide {
    text-align: center;
    height: 100%;
}

div.pslide img {
    vertical-align: middle;
}



.ps-wrap .bx-wrapper {
  position: relative;
  margin: auto 0;
  padding: 0;
  *zoom: 1;
}

.ps-wrap .bx-wrapper img {
  max-width: 100%;
}

/** THEME
===================================*/

.ps-wrap .bx-wrapper .bx-viewport {
  -moz-box-shadow: 0 0 5px #ccc;
  -webkit-box-shadow: 0 0 5px #ccc;
  box-shadow: 0 0 5px #ccc;
}

.ps-wrap {
  position: relative;
  margin-top: 18px;
  background: #d6d4c8;
  padding: 6px 0 6px;
}

.ps-wrap:before{
  position: absolute;
  top: 0;
  left: 0;
  height: 5px;
  width: 100%;
  content: '';
  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAFCAYAAACEhIafAAAAJElEQVQImQEZAOb/AOXj1/8A5ePX/wDx7+L/ALy6sf8Az87C/97LEYJAFgv5AAAAAElFTkSuQmCC) repeat-x;
  z-index: 1;
}

.ps-wrap:after{
  position: absolute;
  bottom: 0;
  left: 0;
  height: 5px;
  width: 100%;
  content: '';
  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAFCAYAAACEhIafAAAAHklEQVQImWM4f+7Qf4Y9uzb+Z/j4/tF/hqePr0MIANUbEYIYiHfUAAAAAElFTkSuQmCC) repeat-x;
  z-index: 1;
}

.bx-controls-direction {
 position: absolute;   
top: 80px;
}

................................................ ...................................

Answer 1

您可以使用伪元素实现:

div.pslide {
    text-align: center;
    height: 100%;
}

div.pslide:before {
    content:'';
    display: inline-block;
    height: 100%;
    vertical-align: middle;
    margin-right: -0.25em;
}

div.pslide img {
    display: inline-block;
    vertical-align: middle;
}

Example

工作原理

它基于 this CSSTricks 帖子。