Question

i was trying to multiply the answers of my span.

for example the value <span id="total_f">210</span>

and the btw .21 it was %21 percent so we need to make it .21 to multiply it and get the total. btw is VAT in netherlands

if you see the jquery var get_total i did multiply the mul

is my jquery wrong?

this is my jquery

$(document).ready(function(){
   var sum = 0;
   $('input[name=sumof]').each(function(){
        sum += parseInt($(this).val());
   });
   $('input[name=total_f]').val(sum);
   $('#total_f').text(sum);

   var mul = parseInt($('input[name=total_f]').val());

   var get_total = mul * parseInt($('input[name=btw]').val());

   $('input[name=s_btw]').val(get_total);
   $('#s_btw').text(get_total);
});

my html

<table cellpadding="5" cellspacing="0" width="100%">
    <tr>
        <td><strong>Sub Total</strong></td>
        <td>
        <?php
            if ( $get_total_computation['currency'] == 'euro' ) {
                $msg_tot = '&euro;';
            } elseif ( $get_total_computation['currency'] == 'usd' ) {
                $msg_tot = '&#36;';
            }
            echo $msg_tot;

        ?>                      
            <span id="total_f"></span>
            <input type="hidden" name="total_f" value="" />
        </td>
    </tr>
    <tr>
        <td>
            <?
            echo $get_total_computation['quo_btw'];
            $get_per = explode( '%', $get_total_computation['quo_btw']);
            ?>
            <input type="hidden" name="btw" value=".<?=$get_per[0];?>" />
        </td>
        <td>
            <span id="s_btw"></span>
            <input type="hidden" name="s_btw" value="" />
         </td>
    </tr>
    <tr>
        <td><strong>Total</strong></td>
        <td><?=$btw;?></td>
    </tr>
</table>

Answer 1

Use parseFloat to parse values that contain decimal numbers. In your case, btw contains the value .21 for which parseInt is in-appropriate.