Below is a sample beginners Java script to accept HTML form input and add 2 numbers.Copy the code highlighted in blue color and save it as HTML file. Invoke the HTML file in a browser and verify the results.
<HTML>
<HEAD>
<TITLE>Sum</TITLE>
<script type="text/javascript">
function sum()
{
var num1 = document.myform.number1.value;
var num2 = document.myform.number2.value;
var sum = parseInt(num1) + parseInt(num2);
document.getElementById('add').value = sum;
alert(document.getElementById('add').value);
}
</script>
</HEAD>
<BODY>
<FORM NAME="myform">
<INPUT TYPE="text" NAME="number1" VALUE=""/> +
<INPUT TYPE="text" NAME="number2" VALUE=""/>
<INPUT TYPE="button" NAME="button" Value="=" onClick="sum()"/>
<INPUT TYPE="text" ID="add" NAME="result" VALUE=""/>
</FORM>
</BODY>
</HTML>