Change pricing based on whether checkbox is checked or not in Laravel - laravel

Question

I am trying to calculate some shipping prices in Laravel. There are only two options based on weight and I have that working with an if/else statement. The client would like to add an option that if someone would like to ship their items faster and they are under the Priority weight, they can for the additional shipping cost. I set up a checkbox in my blade template but am not 100% sure how to implement it. I would assume I have to do some kind if isset statement.
Here is the code in my blade template:
#if( $total_weight <= 16.00)
<li class="payment__item">
<label for="priority">Priority Mail</label>
<span style="padding-top: 2.5%;">
<input type="checkbox" name="priority" value="1" {{ $shipping_cost['attributes']['priority'] == '10' ? 'checked="checked"' : '1'}} >
</span>
</li>
<li class="payment__item">Total:
<span>${{ number_format($payment_total + $shipping_cost, 2, '.', '')}} </span>
</li>
#else
<li class="payment__item">Total: <span>${{ number_format($payment_total + 10, 2, '.', '')}} </span>
</li>
#endif
And in my controller I have this for my public function:
public function showPayment() {
$cart = Session::get('cart');
$payment_info = Session::get('payment_info');
if($payment_info['status'] == 'on_hold' ) {
$total_weight = $cart->totalWeight;
// $shipping_cost = $cart->totalPrice + 5;
$sales_tax = $cart->totalPrice * .085 ;
$payment_total = $cart->totalPrice + $sales_tax;
return view('cart.payments', ['payment_info' => $payment_info, 'cartItems' => $cart, 'sales_tax' => $sales_tax, 'shipping_cost' => $shipping_cost, 'total_weight'=>$total_weight, 'payment_total' => $payment_total]);
}else{
return redirect()->route("home");
}
}
Any help is much appreciated.
Edit here is the data that is being passed

Answer 1

Use javascript to check if the checkbox is checked. If it is, then add the priority shipping cost to the total
var input = document.querySelector('input[type=checkbox]');
function check() {
var a = input.checked ? "{{$payment_info['price'] + number_format($sales_tax, 2, '.', '') + 10 }}" : "{{$payment_info['price'] + number_format($sales_tax, 2, '.', '') + 5 }} ";
document.getElementById('total').innerHTML = '$ ' + a;
}
input.onchange = check;
check();