javascript - How to center a scrollable image that is larger than the screen -


i'd make image viewer centers image regardless of how big , allows scrolling view entire image.

the problem i'm running that, while centering images smaller container easy, when they're larger tranform i'm doing positions image off right , top of screen.

here fiddle has fixup javascript make work: http://jsfiddle.net/d3y0b8bd/

the code below work smaller images (e.g. https://upload.wikimedia.org/wikipedia/meta/0/08/wikipedia-logo-v2_1x.png)

but larger, translate(-50%, -50%) transform translate image past left , top margins of parent.

.lightboxroot {     position: fixed;     width: 100%;     height: 100%;     overflow: auto;     /*aesthetic*/     background-color: red; } .lightboximg {     position: absolute;     top: 50%;     left: 50%;     margin-right: -50%;     transform: translate(-50%, -50%);     /*aesthetic*/     background-color: blue; }

html:

<div class="lightboxroot">     <div class="lightboximg">         <img id="imgelt" src="http://upload.wikimedia.org/wikipedia/commons/6/65/cute_beagle_puppy_lilly.jpg"></img>     </div> </div>

here's fiddle in js updating position of scrolltop , scrollleft, set scroll center of img.


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