contain-element/contain-element.min.js

function ContainElement(t){function e(){var t=n.parentElement.offsetWidth,a=n.parentElement.offsetHeight;if(t&&a){if(i=t>a/(s*i)*(l*i)?t/l:a/s,n.style.width=l*i+"px",n.style.height=s*i+"px",t<l*i)switch(f){case"left":n.style.left="0px";break;case"right":n.style.left=0-(l*i-t)+"px";break;default:n.style.left=0-(l*i-t)/2+"px"}else n.style.left="0px";if(s*i>a)switch(o){case"top":n.style.top="0px";break;case"bottom":n.style.top=0-(s*i-a)+"px";break;default:n.style.top=0-(s*i-a)/2+"px"}else n.style.top="0px"}else window.setTimeout(e,30)}var i=1,n=t.element||document.getElementById(t.id),l=t.width||n.offsetWidth,s=t.height||n.offsetHeight,o=t.valign||"center",f=t.halign||"center";n.style.position="absolute",n.parentElement.style.overflow="hidden",["relative","absolute","fixed"].indexOf(window.getComputedStyle(n.parentElement,null).getPropertyValue("position"))===-1&&(n.parentElement.style.position="relative"),e(),this.update=e,this.setWidth=function(t){l=t},this.setHeight=function(t){s=t},this.setValign=function(t){o=t},this.setHalign=function(t){f=t},this.getWidth=function(){return l},this.getHeight=function(){return s},this.getValign=function(){return o},this.getHalign=function(){return f},this.getScale=function(){return i}}