$(window).load(function () {
vs
$(function() {
$( document ).ready(function() {
<html>
<head>
<script type="text/javascript">
window.onbeforeunload = function() {
return "dummy string; it won't appear to user...";
}
</script>
</head>
<body>
<p>When closing the tab/browser the onbeforeunload event
is triggered...close the tab/browser....</p>
</body>
</html>
if($('#foo').length > 0) {
alert("id 'foo' exists!");
}
else {
alert("id 'foo' doesn't exist!");
}
var foo = 1; //variable exists
if(! typeof foo == 'undefined') {
alert("var 'foo' exists!");
}
else {
alert("var 'foo' doesn't exist!");
}
<meta http-equiv="Refresh" content="0" url="page2.html" />
// tested window.location.reload(); // not tested history.go(0); window.location.href=window.location.href;
<div id="foo"> ... </div>Javascript:
var foo = document.getElementById('foo');
if (!foo) alert('Element with id "foo" not found!');
while (foo.firstChild) {
foo.removeChild(foo.firstChild);
}
Goal: We want browsers not supporting Javascript to ignore the script statemantes.
<script type="text/javascript"> <!-- ... //--> </script>
<script type="text/javascript"> <!--//--><![CDATA[//><!-- ... //--><!]]> </script>
<script src="foo.js" type="text/javascript"></script>
var today = new Date(); var msg = "This is JavaScript saying it’s now " + today.toLocaleString(); alert(msg);
window.scrollTo(0,0);