Set the input focus to the first input
The first example sets the input focus to the first enabled, visible <input> tag. I have excluded inputs with a class of datePicker, as the JQuery date picker automatically opens when you set the focus to it.
<html>
<head>
</head>
<body>
<script type="text/javascript">
$(document).ready(function(){
$("input:visible:enabled:first").not(".datePicker").focus();
});
</script>
</body>
</html>
The second example sets the input focus to any input field, including <select> and <textarea> tags (there is a leading colon before the word "input").
<html>
<head>
</head>
<body>
<script type="text/javascript">
$(document).ready(function(){
$(":input:visible:enabled:first").not(".datePicker").focus();
});
</script>
</body>
</html>