Calculate multiple values

**kivison** · Apr 17, 2007, 04:52

Hi Gurus.

I am new to the whole javascript business. I am designing a page which would be enhanced by the whole javascript experience.

Here goes
I have a table which I have made work where I put some values in and the script works out the result on an onChange event.

My question is that I want to make the table rows populate from a database so each of the javascript values will have to be unique for the value to be worked out on a specific row calculation.

The code as it is works out the single value but how would i go about using the mechanics of the code to apply to multiple lines in the table.

Code:

Heres the page i have designed. 

It has no database content yet but i hope you get the idea.

<Script Language="JavaScript">

function Calc(){
var a,b,result;
var v1,v2;
a=frm1.txt1.value
b=frm1.txt2.value
b=frm1.txt2.value


v1=parseInt(a);
v2=parseInt(b);


result=v1*v2;
frm1.txt4.value=result;

}

</Script>
</head>
<body>
<form name="frm1">
 <p>&nbsp;</p>
 <table width="500" border="1" cellspacing="0" cellpadding="0">
   <tr>
     <td>Val 1 </td>
     <td>Operator</td>
     <td>val2</td>
     <td>result</td>
   </tr>
   <tr>
     <td><input type="text" name="txt1" size="20" onChange="Calc()"></td>
     <td>Multiply X</td>
     <td><input type="text" name="txt2" size="20" onChange="Calc()"></td>
     <td><input type="text" name="txt4" size="20"></td>
   </tr>
 </table>
 <p>&nbsp;</p>
 <p>
 </form>

Hope you can help

King Regards

Keith

**SimplyFu** · Apr 17, 2007, 07:33

you mean that you need a function that can be called to different object without mixing up with each other, you should try to make a function class, and define some parameters in your calc() function to allow different object id to be passed in.

**kivison** · Apr 18, 2007, 03:15

Thanks for getting back to me SimplyFu

OH this looks like a challenge. Ive only just started with Javascript.

Are there any good tutorials you can recommended? or is it the usual go forth and Google??

Thanks
Keith

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