Adding two numbers in javascript ....

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Dear all,

please help me to find a solution.
I want to add 2 textbox and display result in 3rd one using JAVASCRIPT.

is there any mistake for this code.If yes please provide any solution for me...

C#

<script type="javascript">
function hai()

{
 var num1=document.getElementById(num1).value;
 var num2=document.getElementById(num2).value;;
 var num3=num1+num2;
 alert(num3);
 document.getElementById(result).value = num3;
}</script>
         <INPUT type ="text" id="num1">
<INPUT type = "text" id="num2" onchage="hai()">
<INPUT type = "text" id="result"  READONLY>

Posted 9-Mar-13 7:05am

neethujayan

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[no name] 9-Mar-13 13:13pm

Is there any mistake in your code?

Mike Meinz 9-Mar-13 13:28pm

Is this your homework? Do you want us to do it for you?

neethujayan 10-Mar-13 10:11am

yes..its for my project work.

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Michael Haephrati · Accepted Answer · 2013-03-09T07:41:00

Javascript allows using 3 data types:

String
Number
Boolean

The datatype of your text boxes is String, while to perform any numeric calculation, you must use a Number.
So, you need to convert the contents of the text boxes to a number.

parseInt(num1)

and

parseInt(num2)

Then, you need to do your math and convert the result back to a String using:

result.toString()

So, if 'num3' should display the result of your calculation:

num3=a.toString(parseInt(num1)+parseInt(num2));

*Abhishek Pant* · Accepted Answer · 2013-03-09T07:51:00

try the code below:

HTML

<input type="text" id="input1" />
<input type="text" id="input2" onchange="doMath();"/>
<input type="text" id='my_sum'  readonly />

<script type="text/javascript">
    function doMath()
    {
        // Capture the entered values of two input boxes
        var input1 = document.getElementById('input1').value;
        var input2 = document.getElementById('input2').value;

        // Add them together and display
        var sum = parseInt(input1) + parseInt(input2);
        document.getElementById('my_sum').value = sum; 
    }
</script>

Adding two numbers in javascript ....

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