8)Write Ajax program to carry out validation for a username enteredin textbox. If the textbox is blank, print ‘Enter username’. If thenumber of characters is less than three,print’ Username is tooshort’. If value entered is appropriate the print ‘Valid username’.
<html>
<head>
<script type="text/javascript">
function val_user()
{
str=document.getElementById("u_name").value;
if(str=="")
{
document.getElementById("a").innerHTML="Username Should not be Empty";
}
else if(str.length<=3)
{ document.getElementById('a').innerHTML="lenght is too short"; }
else
{
document.getElementById('a').innerHTML="valid username";
}
}
</script>
</head>
<body>
<form>
<table align="center">
<tr><td<b>Enter Username : </b></td><td><input type=text name=u_name id=u_name></td></tr>
<tr><td</td<td><font color="red" size=3><span id=a></span></font></td></tr>
<tr><th colspan="2"><input type=button value=submit onclick="val_user()"></th></tr>
</table>
</form>
</body>
</html>
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