javascript - Converting HTML functions into PHP scripts. (two select values to multiply) -


my job convert following javascript functions php , display correct results. how use php multiply 2 values of numa , numb select options? discount must displayed in discount input box, grand total in total input box. having difficulties creating php script takes 2 selected options's values , multiplies them, while displaying 2 results in boxes below.

this html code functions need convert php.

<!doctype html> <html> <head>     <title>     </title> <script> var numa = 0; function totala(vala) { if (vala) {     numa = number(vala);} var disc = numb*numa; var totalcost = (numa - disc);      document.getelementbyid("total").value = "$" + totalcost.tofixed(2);     document.getelementbyid("discount").value = "$" + disc.tofixed(2);} var numb = 0; function totalb(valb) { if (valb) {     numb = number(valb);} var disc =  numb*numa; var totalcost = (numa - disc);     document.getelementbyid("total").value = "$" + totalcost.tofixed(2);     document.getelementbyid("discount").value = "$" + disc.tofixed(2);}    </script>      </head> <div align="center"> <br> <form name id="main"> <select id="numa" placeholder="please select service" onchange="totala(this.value);">     <option value="" disabled selected>select service</option>     <option value="125">makeover</option>     <option value="60">hair styling</option>     <option value="35">manicure</option>     <option value="200">permanent makeup</option>    </select> <br><br> <select id="numb" placeholder="please select discount" onchange="totalb(this.value);">     <option value="" disabled selected>select discount</option>     <option value="0">0%</option>     <option value=".1">10%</option>     <option value=".2">20%</option>       </select>     <br><br> <td>discount coupon: <input id="discount" name="showtotal" type="text" value="$0.00" size="10" readonly/></td> <td>grand total: <input id="total" name="showtotal" type="text" value="$0.00" size="10" readonly=""/></td> <br><br> </form> <hr> </div> </html>

first update form:

<form action="" method="post">     <select name="service" id="service" placeholder="please select service">         <option value="" disabled selected>select service</option>         <option value="125">makeover</option>         <option value="60">hair styling</option>         <option value="35">manicure</option>         <option value="200">permanent makeup</option>        </select>     <br><br>     <select name="discount" id="discount" placeholder="please select discount">         <option value="" disabled selected>select discount</option>         <option value="0">0%</option>         <option value=".1">10%</option>         <option value=".2">20%</option>       </select>     <br><br>     <button type="submit">calculate</button> </form>

process form submission php (calculate total cost & discount):

<?php     $service = isset($_post['service']) ? $_post['service'] : 0;     $discount = isset($_post['discount']) ? $_post['discount'] : 0;     $total_discount = number_format($discount * $service, 2);     $total_cost = number_format($service - $total_discount, 2); ?>

finally, display total cost & discount:

<p>discount coupon: <input id="discount" type="text" value="&dollar;<?php echo $total_discount; ?>"/></p> <p>grand total: <input id="total" type="text" value="&dollar;<?php echo $total_cost; ?>"/></p>

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