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<html>
<head>
<title>Try/Catch</title>
</head>
<body>
<form name="formexample" id="formexample" action="#">
<div id="valueDiv">Enter a value: <input id="value" name="value"></div>
<div><input id="submit" type="submit"></div>
</form>
<script type="text/javascript">
function checkValid() {
try {
var valueField = document.forms[0]["value"];
if (valueField.value != "A") {
throw "It's not what I need";
}
}
catch(errorObject) {
alert(errorObject);
}
}
function init() {
document.forms[0].onsubmit = function() { return checkValid() };
}
window.onload = init;
</script>
</body>
</html>
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