JSFiddle - React, Tailwind, and code Playground

by Simca

HTML

<div id="one">One</div>
<div id="two">Two</div>

CSS

div {
    width:100%;
    height:500px;
    background:#EEE;
}
#two {
    position:absolute;
    left:200px;
    width:100px;
    height:550px;
    top:0px;
    background:#BBB;
}

JavaScript

function isOverlap(idOne,idTwo){
        var objOne=$(idOne),
            objTwo=$(idTwo),
            offsetOne = objOne.offset(),
            offsetTwo = objTwo.offset(),
            topOne=offsetOne.top,
            topTwo=offsetTwo.top,
            leftOne=offsetOne.left,
            leftTwo=offsetTwo.left,
            widthOne = objOne.width(),
            widthTwo = objTwo.width(),
            heightOne = objOne.height(),
            heightTwo = objTwo.height();
        var leftTop = leftTwo > leftOne && leftTwo < leftOne+widthOne                  && topTwo > topOne && topTwo < topOne+heightOne,             rightTop = leftTwo+widthTwo > leftOne && leftTwo+widthTwo < leftOne+widthOne                  && topTwo > topOne && topTwo < topOne+heightOne,             leftBottom = leftTwo > leftOne && leftTwo < leftOne+widthOne                  && topTwo+heightTwo > topOne && topTwo+heightTwo < topOne+heightOne,             rightBottom = leftTwo+widthTwo > leftOne && leftTwo+widthTwo < leftOne+widthOne                  && topTwo+heightTwo > topOne && topTwo+heightTwo < topOne+heightOne;
        return leftTop || rightTop || leftBottom || rightBottom;
}

alert(isOverlap("#one","#two"));