javascript - Radio button selection for paypal form issue -

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need help

so have paypal form has 2 radio buttons. 1 shipping value, , 1 without. here link actual form http://www.topchoicedata.com/test.php

what want happen if person selected first radio box("$19.99 shipping – database sent on cd rom"), 19.99 automatically added "hdwppamount" amount set @ $175, when person press's "pay now", make grand total of $194.99 on paypal page.

and if person selected second option instead("free shipping – database sent via email") instead, of course no value added "hdwppamount" amount , $175 total paypal page.

now code work if person chooses on or other options, , not alternate between radio buttons deciding 1 choose. kind of buggy because if choose first option, decided second option, , on , forth alternating, either error page or if did choose free option, 19.99 still gets added.

i need if first option chosen, 19.99 gets added, , if second option chosen, nothing added.

any appreciated. 

<!--------------------html form---------------------_    <form action="pppaymentform/pppaymentform.php"  method="post" name="topchoiceform" id="topchoiceform">     <input placeholder="company name" type="text" name="companyname" required>     <input placeholder="first name" type="text" name="first_name" required>     <input placeholder="last name" type="text" name="last_name" required>     <input placeholder="email" type="email" name="email" id="email" required>     <input placeholder="address" type="text" name="address1" required>      <input name="shipping" class="shipping" type="radio" id="shipping" checked/>     <label class="shippingcheck">$19.99 shipping – database sent on cd rom </label>      <br>     <input name="shipping" class="shipping" type="radio" id="noshipping"/>     <label class="shippingcheck">free shipping – database sent via email</label>      <br>     <button name="submit" type="submit" id="submit">pay now</button>        <!-------------paypal part------------->     <input type="hidden" name="hdwtablename" id="hdwtablename" value="1">     <input type="hidden" name="hdwppproductname" id="hdwppproductname" value="basic plan 175">     <input type="hidden" name="hdwppamount" id="hdwppamount" value="175">     <input type="hidden" name="hdwppcurrency" id="hdwppcurrency" value="usd">     <input type="hidden" name="hdwpplanguage" id="hdwpplanguage" value="en_us">     <input type="hidden" name="hdwok" id="hdwok" value="http://www.topchoicedata.com/paymentmadethanks.php">     <input type="hidden" name="hdwemail" id="hdwemail" value="mauriceflopez+gmail.com">     <input type="hidden" name="hdwnook" id="hdwnook" value="http://">     <input type="hidden" name="hdwactivation_email" id="hdwactivation_email" value="email">     <input type="hidden" name="plan" id="plan" value="$175">     <input type="hidden" name="shippingchoosen" id="shippingchoosen" value="">     <input type="hidden" name="shippingnumber" id="shippingnumber" value="">   </form>

php

<script>  $('#shipping').change(function(){      var hdwppamount = number($("#hdwppamount").val())      var shippingcost = 19.99;         if (this.checked) {          $("#hdwppamount").val(hdwppamount+shippingcost)       } else {          $("#hdwppamount").val(hdwppamount-shippingcost)       }  })  </script>

with radio may have 1 of them checked @ time. means have test 1 checked in specified moment (i.e.: change event).

i changed input field hdwppamount hidden text in snippet make clear behaviour.

$(function () {    $('#shipping, #noshipping').on('change', function(){      var hdwppamount = number($("#hdwppamount").val());      var shippingcost = 19.99;      if (this.id == 'noshipping') { // shipping unchecked        $("#hdwppamount").val(hdwppamount-shippingcost);      } else { // shipping checked        $("#hdwppamount").val(hdwppamount+shippingcost);      }    });    // initialize field correct value    $("#hdwppamount").val('194.99');  });
<script src="https://code.jquery.com/jquery-1.12.1.min.js"></script>    <form action="pppaymentform/pppaymentform.php"  method="post" name="topchoiceform" id="topchoiceform">      <input placeholder="company name" type="text" name="companyname" required>      <input placeholder="first name" type="text" name="first_name" required>      <input placeholder="last name" type="text" name="last_name" required>      <input placeholder="email" type="email" name="email" id="email" required>      <input placeholder="address" type="text" name="address1" required>        <input name="shipping" class="shipping" type="radio" id="shipping" checked/>      <label class="shippingcheck">$19.99 shipping – database sent on cd rom </label>      <br>      <input name="shipping" class="shipping" type="radio" id="noshipping" />      <label class="shippingcheck">free shipping – database sent via email</label>        <br>      <button name="submit" type="submit" id="submit">pay now</button>            <!-------------paypal part------------->      <input type="hidden" name="hdwtablename" id="hdwtablename" value="1">      <input type="hidden" name="hdwppproductname" id="hdwppproductname" value="basic plan 175">      <input type="text" name="hdwppamount" id="hdwppamount" value="175">      <input type="hidden" name="hdwppcurrency" id="hdwppcurrency" value="usd">      <input type="hidden" name="hdwpplanguage" id="hdwpplanguage" value="en_us">      <input type="hidden" name="hdwok" id="hdwok" value="http://www.topchoicedata.com/paymentmadethanks.php">      <input type="hidden" name="hdwemail" id="hdwemail" value="mauriceflopez+gmail.com">      <input type="hidden" name="hdwnook" id="hdwnook" value="http://">      <input type="hidden" name="hdwactivation_email" id="hdwactivation_email" value="email">      <input type="hidden" name="plan" id="plan" value="$175">      <input type="hidden" name="shippingchoosen" id="shippingchoosen" value="">      <input type="hidden" name="shippingnumber" id="shippingnumber" value="">  </form>


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