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<!DOCTYPE html>
<html>
<head>
<style>
html, body {
height: 100%;
}
#aligner {
height: 100%;
display: flex;
align-items: center;
justify-content: center;
}
#container {
width: 50%;
height: 50%;
background: #FF9800;
display: flex;
align-items: center;
justify-content: center;
cursor: pointer;
position: relative;
}
#dimensions {
font-size: 3em;
color: #FFF;
}
#dim-x, #dim-y {
color: #263248;
}
</style>
</head>
<body>
<div id="aligner">
<div id="container">
<div id="dimensions">
<span id="dim-x"></span>x<span id="dim-y"></span>
</div>
</div>
</div>
<script src="../node_modules/jquery/dist/jquery.min.js"></script>
<script src="../build/element-resize-detector.js"></script>
<script>
$(function onDomReady() {
function updateDimensions(element) {
var style = getComputedStyle(element);
var width = parseInt(style.width);
var height = parseInt(style.height);
$("#dim-x").html(width);
$("#dim-y").html(height);
}
var container = $("#container");
var erd = elementResizeDetectorMaker({
strategy: "scroll",
callOnAdd: true,
debug: true
});
erd.listenTo(container, updateDimensions);
container.click(function onContainerClick() {
function rand(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
var width = rand(30, 90);
var height = rand(30, 90);
$(this).css({
width: width + "%",
height: height + "%"
});
});
});
</script>
</body>
</html>