please help me, I need to update the result of my total every time I change the amount
<script type="text/javascript">
function operacion(field) {
//Obtengo el formulario
var form = field.parentNode;
//Obtengo el valor del campo 1
var numero1 = form.cantidad.value;
//Obtengo el valor del campo 2
var numero2 = form.precio.value;
//Hago el calculo y se lo asigno al campo de texto correspondiente
form.total.value = ( numero1 * numero2 );
console.log(form.total.value);
}
</script>
<?php
$totalProducto=0;
foreach ($sql_Producto as $itemListarProductoCarrito):
$preci = $itemListarProductoCarrito['costo_promedio_producto'];
?>
<form>
<table class="table table-bordered">
<tr>
<a href="eliminardelcarro.php?id=<?php echo $c["product_id"]; ?>" class="fa fa-fw fa-minus-circle" data-toggle="tooltip" title="Eliminar"></a>
</tr>
<tr><br>
<!--aqui le aumento para la cantidad para poder modificar si el ususario lo desea-->
<label>Cantidad</label>
<select name="cantidad" style="width:100px;" class="form-control" onchange="operacion(this)" >
<option value="<?php echo $c["q"]; ?>"><?php echo $c["q"]; ?></option>
<option value=""></option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
</tr>
<tr><br>
<td><label>Precio Unitario</label></td>
<td><input align="right" style="width:100px;" class="form-control" type="text" name="precio" value="<?php echo $preci;/*recibo mi precio*/ ?>" onchange="operacion(this)" readonly></td>
</tr>
<tr>
<td><label>Total</label></td>
<td><input align="right" style="width:100px;" class="form-control" type="text" name="total" value="<?php echo '$' . $total = $c["q"] * $preci; /*aqui multiplico la cantidad enviada * por el precio*/?>"readonly></td>
<?php $totalProducto += $total;/*sumo todos los valores totales*/ ?>
</tr>
</table>
</form>
<?php
endforeach;
?>
until everything works fine since I add all the values within my foreach Now I need to add the values but now these with a SELECT to change the amount since the amount $ c ["q"] sends me from another form but I can not with the new amount since I would be containing it with the name="total" I think it would be something to do something but I can not think of it as
