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Adding two text fields together to a third total text fields

Posted on 2008-10-28
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Last Modified: 2012-05-05
I have a form that I want to pass an "amount" variable to paypal.    My user has two distinct sets of radio buttons that feed two text boxes and I would like to add those two text boxes on the fly to a third text box showing the total before the user passes that value to paypal builtin "amount" variable.  I am using paypal toolkit and have not found a way to manipulate these variable after the form is posted to my processing page.  I don't want to use javascript but have not found another method in my searches.  Here is my code...can you help me to get this to work...Secondarily does anyone know where I can find some documentation for the php toolkit..I am solely dependent on their read me file..this is not my primary question..thx for the help
<html>
 
 

<head>

   

     <script language="JavaScript" type="text/JavaScript">
 

     function add() {

     var total= ((document.test.abc.value*1) + (document.test.abd.value*1));

     document.test.total.value=total;

     }

     </script>

</head>

 
 
 

<body>

<center>

<form name="test">

<input type=radio name=R1 value=40.00 onclick="document.test.abc.value=
 

this.value">40.00<br>

<input type=radio name=R1 value=50.00  onclick="document.test.abc.value=
 

this.value">50.00
 

<br><br>

<br>

<input type=radio name=R2 value=5.00 onclick="document.test.abd.value=
 

this.value">5.00<br>
 

<input type=radio name=R2 value=10.00 onclick="document.test.abd.value=
 

this.value">10.00<br>
 

<input type=radio name=R2 value=15.00 onclick="document.test.abd.value=
 

this.value">15.00<br>

<input type=text name=abc onchange="add();" value ="" >

<input type=text name=abd onchange="add();" value ="">

<input type=text size="5"  name=total  >

<input type="reset" name="reset">

</form>

</center>

</body>
 

</html>

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Question by:greta13
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5 Comments
 
LVL 82

Expert Comment

by:hielo
ID: 22824342
var total= ( parseInt(document.test.abc.value*1) + parseInt(document.test.abd.value*1));
0
 

Author Comment

by:greta13
ID: 22824489
This has to be put in the head as part of a function doesn't it?
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LVL 82

Accepted Solution

by:
hielo earned 500 total points
ID: 22825059
just call add() after you click the radio buttons:
<html>

 

 

<head>

   

     <script language="JavaScript" type="text/JavaScript">

 

     function add() {

     var total= ((document.test.abc.value*1) + (document.test.abd.value*1));

     document.test.total.value=total;

     }

     </script>

</head>

 

 

 

<body>

<center>

<form name="test">

<input type=radio name=R1 value=40.00 onclick="document.test.abc.value=this.value; add();">40.00<br>

<input type=radio name=R1 value=50.00  onclick="document.test.abc.value=this.value; add();">50.00

 

<br><br>

<br>

<input type=radio name=R2 value=5.00 onclick="document.test.abd.value=this.value; add();">5.00<br>

 

<input type=radio name=R2 value=10.00 onclick="document.test.abd.value=this.value; add();">10.00<br>

 

<input type=radio name=R2 value=15.00 onclick="document.test.abd.value=this.value; add();">15.00<br>

<input type=text name=abc onchange="add();" value ="" >

<input type=text name=abd onchange="add();" value ="">

<input type=text size="5"  name=total  value="">

<input type="reset" name="reset">

</form>

</center>

</body>

 

</html>

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0
 

Author Closing Comment

by:greta13
ID: 31510852
Thanks
0
 
LVL 82

Expert Comment

by:hielo
ID: 22825991
glad to help
0

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