Server side form validation 2

templates/make-reservation.page.tmpl

@@ -8,10 +8,14 @@
             <!-- <form method="post" action="" class="needs-validation" novalidate> -->
             <form method="post" action="" class="" novalidate>
                 <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
+
                 <div class="form-group mt-5">
                     <label for="first_name">First name:</label>
-                    <input type="text" name="first_name" id="first_name" class="form-control" required
-                        autocomplete="off">
+                    {{with .Form.Errors.Get "first_name"}}
+                    <label class="text-danger">{{.}}</label>
+                    {{end}}
+                    <input type="text" name="first_name" id="first_name" class="form-control {{with .Form.Errors.Get "first_name"}} is-invalid {{end}}"
+                        required autocomplete="off">
                 </div>
                 <div class="form-group mt-5">
                     <label for="last_name">Last name:</label>