Javascript Onclick event handler

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I got a problem with the Javascript Onclick event handler, i haven click the radio button and press the submit button, it direct show me the total cost. May i know how to solve it

and the second problem is i want to made the total cost show in alert form. May i know how??
this is my coding

XML

<?xml version = "1.0" encoding = "utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
      http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns = "http://www.w3.org/1999/xhtml">
   <head><title> Practical Lab 5.5</title>
   <script type = "text/javascript" src = "sum.js"></script></head>
   <body>
   <form name = "myForm" action = "" >
	Motherboard (RM59 each) <input type="radio" id="value1" name="value1" onclick ="addNumbers(val1)" value="59" />
        <br />
        Harddisk (RM49 each) <input type="radio" id="value2" name="value2" onclick ="addNumbers(val2)" value="49" />
        <br />
        Keyboard (RM39 each) <input type="radio" id="value3" name="value3" onclick ="addNumbers(val3)" value="39" />
        <br />
        <input type="button" name="Submit" value="Submit" onclick="javascript:addNumbers()"/>
        <br />
        Total cost including 5% tax = <input type="text" id="answer" name="answer" value=""/>
      	</form>
   	</body>
	</html>

JavaScript

function addNumbers()
                {
                  	var val1 = parseInt(document.getElementById("value1").value);
                        var val2 = parseInt(document.getElementById("value2").value);
			var val3 = parseInt(document.getElementById("value3").value);
                        var ansD = document.getElementById("answer");
                        ansD.value = val1 + val2 + val3 + 7.35;
                }

Posted 3-May-12 2:47am

Jayfam

Updated 3-May-12 2:48am

v2

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Comments

Sandeep Mewara 3-May-12 8:49am

Not clear on what is the issue and where are you stuck.

Jayfam 3-May-12 8:51am

normally is i click the radio button on the 3 product, then only press submit to get the total cost
but this case is i direct press submit button, it comes out the total cost. so this is my problem

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nrgjack · Answer 1 · 2012-05-03T03:40:00

hi,

just some idea

why do you use

HTML

<input type="text" id="answer" name="answer" value="" />

you could use

HTML

<span id="answer"></span>

and

JavaScript

document.getElementById("answer").innerHTML = val1 + val2 + val3 + 7.35;

i'm not a js guru, but sometimes i use "number" function
example i'd try

JavaScript

document.getElementById("answer").value = Number(val1) + Number(val2) + Number(val3) + 7.35;

Javascript Onclick event handler

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