JavaScript Document Object Part – 3
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Program 1
<html>
<head><title>Java Script date Demo</title>
<script language="javascript">
function validate()
{
var rn,name,p,c,m;
rn=document.getElementById("STROLLNO").value;
name=document.getElementById("STNAME").value;
p=document.getElementById("STPHY").value;
c=document.getElementById("STCHEM").value;
m=document.getElementById("STMATH").value;
if(rn=="")
{
alert("Roll No can not be blank")
document.getElementById("STROLLNO").focus()
return false;
}
if(name=="")
{
alert("Name can not be blank")
document.getElementById("STNAME").focus()
return false;
}
if(p=="")
{
alert("Physics marks can not be blank")
document.getElementById("STPHY").focus()
return false;
}
if(p>100 || p<0)
{
alert("Invalid physics marks")
document.getElementById("STPHY").focus()
return false;
}
if(c=="")
{
alert("Chemistry marks can not be blank")
document.getElementById("STCHEM").focus()
return false;
}
if(c>100 || c<0)
{
alert("Invalid chemistry marks")
document.getElementById("STCHEM").focus()
return false;
}
if(m=="")
{
alert("Maths marks can not be blank")
document.getElementById("STMATH").focus()
return false;
}
if(m<0 || m>100)
{
alert("Invalid maths marks")
document.getElementById("STMATH").focus()
return false;
}
document.writeln("<center>")
document.writeln("<table border=1>")
document.writeln("<tr><th>Roll No</th><th>Name</th><th>Physics</th><th>Chemistry</th><th>Maths</th></tr>")
document.writeln("<tr>")
document.writeln("<td>"+rn+"</td>")
document.writeln("<td>"+name+"</td>")
document.writeln("<td>"+p+"</td>")
document.writeln("<td>"+c+"</td>")
document.writeln("<td>"+m+"</td>")
document.writeln("</tr>")
document.writeln("<tr>")
var total
p=parseInt(p)
c=parseInt(c)
m=parseInt(m)
total=p+c+m
per=total/3
document.writeln("<td>Total:"+total+"</td>")
document.writeln("<td>Percentage:"+per+"</td>")
document.writeln("</tr>")
document.writeln("</table>")
document.writeln("</center>")
}
</script>
</head>
<body>
<center>
<form>
<table border=1>
<tr>
<th>Roll No</th>
<td><input type=text name=txtuser id="STROLLNO"></td>
</tr>
<tr>
<th>Name</th>
<td><input type=text name=txtname id="STNAME"></td>
</tr>
<tr>
<th>Physics</th>
<td><input type=text name=txtname id="STPHY"></td>
</tr>
<tr>
<th>Chemistry</th>
<td><input type=text name=txtname id="STCHEM"></td>
</tr>
<tr>
<th>Maths</th>
<td><input type=text name=txtname id="STMATH"></td>
</tr>
<tr>
<td></td>
<td><input type="button" value="Submit" onclick="return validate()"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
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