How to Read and Write Data from HTML in JavaScript
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Program 1
<html><head><title>Test Java Script variables</title>
<script lang="javascript">
function addition()
{
var a,b,c
a=document.getElementById("txtFirst").value;
b=document.getElementById("txtSecond").value;
a=parseInt(a)
b=parseInt(b)
c=a+b
document.getElementById("txtThird").value=c
//alert(c)
//document.write(a);
//document.write("<br>")
//document.write(b);
}
</script>
</head>
<body>
<center>
<form>
<table border="1">
<tr>
<th>Enter First Number</th>
<td><input type=text name="txt1" id="txtFirst"></td>
</tr>
<tr>
<th>Enter Second Number</th>
<td><input type=text name="txt2" id="txtSecond"></td>
</tr>
<tr>
<th>Result</th>
<td><input type=text name="txt3" id="txtThird"></td>
</tr>
<tr>
<td></td>
<td><input type=button value="Addition" onclick="addition()"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
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