JSFiddle - React, Tailwind, and code Playground

by fredd man

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>

<div id="container">
  <div id="zoom-container">
    <div class="box red">A</div>
    <div class="box blue">B</div>
    <div class="box green">C</div>
    <div class="box black">D</div>

    <div class="box red l">E</div>
    <div class="box blue l">F</div>
    <div class="box green l">G</div>
    <div class="box black l">H</div>

    <div class="box red">I</div>
    <div class="box blue">J</div>
    <div class="box green">K</div>
    <div class="box black">L</div>

    <div class="box red l">M</div>
    <div class="box blue l">N</div>
    <div class="box green l">O</div>
    <div class="box black l">P</div>
  </div>
</div>

CSS

* { margin: 0; }

body, html { height: 100%; }

#container {
  height: 100%;
  width: 50%;
  margin: 0 auto;
  overflow: hidden;
}

#zoom-container {
  height: 100%;
  width: 100%;
  will-change: transform;
}

.box {
  float: left;
  width: 25%;
  height: 25%;
  color: white;
  text-align: center;  
}

.red { background: red; }
.blue { background: blue; }
.green { background: green; }
.black { background: black; }
.l { opacity: .3 }

JavaScript

var zoomedIn = false;
var zoomContainer = $("#zoom-container");

$(".box").click(function(event) {
  var el = this;
  
  if (zoomedIn) {    
    zoomContainer.css({
    	transform: "scale(1)",
      transformOrigin: "0 0"
    });
    zoomContainer.parent().scrollTop(0).scrollLeft(0);
    zoomedIn = false;
    return;
  } 
  zoomedIn = true;
  var $el = $(el);
  animate($el);
  zoomContainer.on('transitionend', function(){
  	zoomContainer.off('transitionend');
  	reposition($el);
  })
});

var COLS = 4, ROWS = 4, 
  	COLS_STEP = 100 / (COLS - 1), ROWS_STEP = 100 / (ROWS - 1),
    ZOOM = 4;
  

function animate($box) {
  var cell = getCell($box);
  var col =  cell.col * COLS_STEP + '%',
      row =  cell.row * ROWS_STEP + '%';
  zoomContainer.parent().css('overflow', 'hidden');
	zoomContainer.css({
    transition: 'transform 0.2s ease-in-out',
  	transform: "scale(" + ZOOM + ")",
    transformOrigin: col + " " + row
  });
}
function reposition($box) {
  zoomContainer.css({
    transition: 'none',
  	transform: "scale(" + ZOOM + ")",
    transformOrigin: '0 0'
  });  
  zoomContainer.parent().css('overflow', 'auto');
  $box.get(0).scrollIntoView();
}
function getCell ($box) {
	var idx = $box.index();
  var col = idx % COLS,
      row =  (idx / ROWS) | 0;
  return { col: col, row: row };
}