Animowane formularze JavaScript

Demonstracja zmian pól formularza w zależności od wartości w polu ComboBox (input type select)
Ctrl + Shift + K – konsola JavaScript (Firefox)

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
   "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Sample</title>
<script type="text/javascript">

onload = function(e) {
  document.forms["myForm"]["intelligenceOther"].style.display = "none";
  document.forms["myForm"]["intelligence"].onchange = function (e) {

        e.target.form["intelligenceOther"].style.display = e.target[e.target.selectedIndex].value == "other" ? "inline" : "none";
       if (e.target[e.target.selectedIndex].value == "1")
           document.forms["myForm"]["liczba"].value= "Opcja 1sza";
         else
document.forms["myForm"]["liczba"].value=  "Opcja inna niż 1sza";
  };
  document.forms["myForm"]["intelligence"].selectedIndex = 0;
}
</script>
</head>
<body>
<form id="myForm" action="">
<div>
<select name="intelligence">
<option value="1" selected="selected">Dull (0-1)</option>
<option value="2">Smart (1-2)</option>
<option value="3">Brilliant (2-3)</option>
<option value="other">Other</option>
</select>
<input type="text" name="intelligenceOther">
<br>
<input type="text" name="liczba">
</div>

</form>
</body>
</html>
JavaScript