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resizeobserver.html
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<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no">
<meta name="title" content="ResizeObserver">
<meta name="description" content="This API registers observers on specified element(s) to run when the element's size is changed.">
<meta name="image" content="">
<meta name="site" content="">
<link type="text/css" rel="stylesheet" href="./css/fonts.css" />
<link type="text/css" rel="stylesheet" href="./css/style.css" />
<title>Web APIs Resize Observer Example</title>
<style>
#resizeBox {
background-color: green;
width: 100px;
height: 100px;
}
#resizeBoxCnt {
height: 200px;
}
</style>
<body>
<header>
<div class="header-bars" onclick="toggleNav('.aside-navbar')"><span class="header-bar fa-bars"></span></div>
<div class="title-bar"><h2>Web APIs</h2></div>
<div class="navbar">
<ul class="navbar-nav">
<li class="navbar-nav-item">
<a onclick="toggle('.dropdown')">More APIs</a>
<ul class="dropdown close">
<li class="dropdown-item"><a>History API</a></li>
<li class="dropdown-item"><a>Vibration API</a></li>
<li class="dropdown-item"><a>Fullscreen API</a></li>
<li class="dropdown-item"><a href="./index.html">More ...</a></li>
</ul>
</li>
</ul>
</div>
</header>
<aside class="aside-sidebar" id="leftAside">
<div class="aside-sidebar-header">
<h3>Web APIs Menu</h3></div>
<ul>
<li><a href="./bluetooth.html">Bluetooth API</a></li>
<li><a href="./touch.html">Touch API</a></li>
<li><a href="./battery.html">Battery API</a></li>
<li><a href="./clipboard.html">Clipboard API</a></li>
<li><a href="./audio.html">Web Audio API</a></li>
<li><a href="./broadcastchannel.html">Broadcastchannel Messaging API</a></li>
<li><a href="./channelmessaging.html">Channel Messaging API</a></li>
<li><a href="./fullscreen.html">Fullscreen API</a></li>
<li><a href="./history.html">History API</a></li>
<li><a href="./vibration.html">Vibration API</a></li>
<li><a href="./url.html">URL API</a></li>
<li><a href="./speech.html">Web Speech API</a></li>
<li><a class="aside-sidebar-active" href="./resizeobserver.html">Resize Observer API</a></li>
<li><a href="./touch.html">Touch API</a></li>
<li><a href="./pointerlock.html">Pointer Lock API</a></li>
<li><a href="./paymentrequest.html">Payment Request API</a></li>
<li><a href="./pagevisibility.html">Page Visibility API</a></li>
</ul>
</aside>
<div class="container">
<div class="web-api-cnt">
<div class="web-api-card">
<div class="web-api-card-head">
Demo - ResizeObserver
</div>
<div class="web-api-card-body">
<div id="error" class="close"></div>
<div id="stat"></div>
<div id="resizeBoxCnt">
<div id="resizeBox"></div>
</div>
<div>
<span>Resize Width:<input onchange="resizeWidth(this.value)" type="range" min="0" max="100" value="0" /></span>
</div>
<div>
<span>Resize Height:<input onchange="resizeHeight(this.value)" type="range" min="0" max="100" value="0" /></span>
</div>
</div>
</div>
</div>
</div>
</body>
<script src="./js/script.js"></script>
<script>
try {
var resizeObserver = new ResizeObserver(entries => {
for(const entry of entries) {
stat.innerHTML = "Box re-sized. Height:" + entry.target.style.height + " - Width:" + entry.target.style.width
}
})
resizeObserver.observe(resizeBox)
} catch(e) {
error.innerHTML = "ResizeObserver API not supported in this device."
error.classList.remove("close")
}
function resizeWidth(e) {
resizeBox.style.width = `${e}px`
}
function resizeHeight(e) {
resizeBox.style.height = `${e}px`
}
</script>
</html>