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psema4/altermeta.html

Created May 27, 2011 14:54
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Altering Metatags With JS
Raw
altermeta.html
<!doctype html>
<html lang="en">
<head>
<title>Altering Metatags At Runtime</title>
<meta id="meta-test" name="Copyright" content="(C)2011 Some User" />
</head>
<body>
<h1>Altering Metatags At Runtime</h1>
<p id="output">(Click "Check Metatag")</p>
<button onclick="checkMeta('meta-test')">Check Metatag</button>
<button onclick="changeMeta('meta-test', '(C)2011 Some Other User')">Change Metatag Contents</button>
<script type="text/javascript">
window.updateCounter = 1;
function checkMeta(id) {
var el = document.getElementById(id);
try {
document.getElementById('output').innerHTML = el.getAttribute('content');
} catch(e) {
console.log(e);
}
}
function changeMeta(id, newValue) {
var el = document.getElementById(id);
var updateText = newValue + ' [Update #' + window.updateCounter++ + ']';
try {
el.setAttribute('content', updateText);
checkMeta(id);
} catch(e) {
console.log(e);
}
}
</script>
</body>
</html>
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