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L8.6.html
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script>
function catchEvent(eventObj,event,eventHandler){
if(eventObj.addEventListener){
eventObj.addEventListener(event,eventHandler,false);
}else if(eventObj.attachEvent){
event = "on" + event;
eventObj.attachEvent(event,eventHandler);
}
}
function cancelEvent(event){
if(event.preventDefault){
event.preventDefault();
event.stopPropagation();
}else {
event.returnValue = false;
event.cancelBubble = true;
}
}
catchEvent(window,"load",setupEvents);
function setupEvents(evnt){
catchEvent(document.getElementById("text2"),"blur",checkRequired);
catchEvent(document.getElementById("text1"),"change",validateField);
}
function checkRequired(evnt){
var theEvent = evnt?evnt:window.event;
var target = theEvent.target?theEvent.target:theEvent.srcElement;
var txtInput = target.value;
if(txtInput == null || txtInput == ""){
alert("value is required in field");
}
}
function validateField(evnt){
var theEvent = evnt?evnt:window.event;
var target = theEvent.target?theEvent.target:theEvent.srcElement;
var rgEx = /^\d{3}[-]?\d{2}[-]?\d{4}$/g;
var ok = rgEx.exec(target.value);
if(!ok){
alert("not an ssn");
}
}
</script>
</head>
<body>
<form name="someForm">
<input type="text" name="text1" id="text1"><br/>
<input type="password" name="text2" id="text2"><br/>
<input type="hidden" name="text3" value="hidden value">
<textarea id="text4" cols="50" rows="10">text area</textarea><br/><br/>
<input type="submit" value="Submit">
</form>
</body>
</html>