HTML Form javascript sum total taxes -


i have nice working form , working. need total taxes calculated , autofilled. here code:

<table class="tableventa">   <tr>     <td style="width:200px;"></td>     <td valign="top" style="width:900px;"><table class="table900">       <tr>         <td class="header150">default unit price</td>         <td class="header150">type of sell</td>         <td class="header150">apply taxes?</td>         <td class="header150">apply discount?</td>         <td class="header150">quantity</td>         </tr>       <tr>         <td class="header150small"><input type="text" class="input140" name="neto" id="neto" readonly value="1000"></td>         <td class="header150small">          <select class="select146" name="tipo" id="tipo">   <option value="simple" selected>without invoice</option>   <option value="boleta">invoice 1</option>    <option value="factura">invoice 2</option>    </select>     </td>         <td class="header150small"><select class="select146" name="iva" id="iva">   <option value="0" selected>tax free</option>   <option value="19">yes 19%</option>     </select></td>         <td class="header150small">          <select class="select146" name="descuento" id="descuento">   <option value="0" selected>no discount</option>   <option value="2">2% discount</option>   <option value="3">3% discount</option>   <option value="5">5% discount</option>   <option value="8">8% discount</option>   <option value="10">10% discount</option>   <option value="15">15% discount</option>   <option value="20">20% discount</option>   <option value="30">30% discount</option>    <option value="50">50% discount</option>     </select>    </td>         <td class="header150small"><input type="text" class="input140" name="cantidad" id="cantidad" value="1"></td>         </tr>       <tr>         <td class="header150">price after discount</td>         <td class="header150">tax per unit</td>         <td class="header150">subtotal per unit</td>         <td class="header150">total taxes</td>         <td class="header150">total pay</td>         </tr>       <tr>         <td class="header150small"><input type="text" class="input140" name="preciodesc" id="preciodesc" readonly value="1000"></td>    <td class="header150small"><input type="text" class="input140" name="ivaunitario" id="ivaunitario" readonly value="0"></td>         <td class="header150small"><input type="text" class="input140" name="subtotal" id="subtotal" readonly value="1000"></td>         <td class="header150small"><input type="text" class="input140" name="ivatotal" id="ivatotal" readonly value="0"></td>         <td class="header150small"><input type="text" class="input140" name="total" id="total" readonly value="1000"></td>         </tr>       <tr>         <td class="header150small">&nbsp;</td>         <td class="header150small">&nbsp;</td>         <td class="header150">invlice number</td>         <td class="header150">&nbsp;</td>         <td class="header150small">&nbsp;</td>         </tr>       <tr>         <td class="header150small">&nbsp;</td>         <td class="header150small">&nbsp;</td>         <td class="header150small"><input type="text" class="input140" name="documento" id="documento" value=""></td>         <td class="header150small"><input class="someter150" type="reset" value="reset"></td>         <td class="header150small"><input class="someter150" type="button" value="sell now" onclick="document.productos.submit();"></td>         </tr>       </table></td>   </tr> </table>  <script> var taxes    = document.getelementsbyname('iva')[0]; var discount = document.getelementsbyname('descuento')[0]; var cost     = document.getelementsbyname('neto')[0]; var price    = document.getelementsbyname('preciodesc')[0]; var ttaxes   = document.getelementsbyname('ivaunitario')[0]; var total    = document.getelementsbyname('subtotal')[0]; var quantity = document.getelementsbyname('cantidad')[0]; var ttp      = document.getelementsbyname('total')[0];  function updateinput() {   price.value = cost.value - (cost.value * (discount.value / 100));   ttaxes.value = (price.value * (taxes.value / 100));   var sum = parsefloat(price.value) + parsefloat(ttaxes.value);   total.value = sum.tofixed(0);   ttp.value = sum.tofixed(0) * quantity.value; }  taxes.addeventlistener('change', updateinput); discount.addeventlistener('change', updateinput); cost.addeventlistener('change', updateinput); cost.addeventlistener('keyup', updateinput); quantity.addeventlistener('keyup', updateinput);  </script> </form>

here demo fiddle

https://fiddle.jshell.net/v6spxoqv/3/

and here image of need

enter image description here

i think required declare variable "total taxes" think called "ivatotal" (it next other variables):

var ivatot   = document.getelementsbyname('ivatotal')[0];

after operation performed in "updateinput" function (at end of operations contains):

ivatot.value = parsefloat(ttaxes.value) * parsefloat(quantity.value);

function "tipo_cambio" :

function tipo_cambio () { var tipo = document.getelementsbyname('tipo')[0]; if ( tipo.value == "simple" )      taxes.selectedindex = 0; else taxes.selectedindex = 1; updateinput(); }

previous function must called select:

<select class="select146" name="tipo" id="tipo" onchange="tipo_cambio()">

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