added onetime payment in Order/Form

Layout/default/Product/Form.php

@@ -180,7 +180,7 @@
                   <div class="form-group row">
                     <label class="col-lg-2 col-form-label" for="price">Verkaufspreis Netto (Periodisch) *</label>
                     <div class="col-lg-10">
-                      <input type="text" name="price" id="price" class="form-control" value="<?=$this::dotToComma($product->price)?>" />
+                      <input type="text" name="price" id="price" class="form-control" value="<?=$this::dotToComma($product->price)?>" <?=(!$product->billing_period && !(float)$product->price) ? "disabled='disabled'" : ""?> />
                     </div>
                   </div>
                   <div class="form-group row">
@@ -334,7 +334,18 @@
       $('#producttech_form').hide();
     }
   });
-  
+
+  $("#billing_period").change(() => {
+      var price = Number.parseFloat($("#price").val().replace(",","."));
+      var period = Number.parseInt($("#billing_period").val());
+
+      if(!period && !price) {
+          $("#price").prop("disabled", true);
+      } else {
+          $("#price").prop("disabled", false);
+      }
+  });
+
   // disable mousewheel on input number field when in focus
   $('form').on('focus', 'input[type=number]', function (e) {
     $(this).on('wheel.disableScroll', function (e) {