#68 ping but style

src/main/java/ru/ulstu/conference/controller/ConferenceController.java

@@ -126,7 +126,7 @@ public class ConferenceController {
         return CONFERENCE_PAGE;
     }
 
-    @PostMapping(value = "/conference", params = "ping")
+    @PostMapping(value = "/conference", params = "pingConference")
     public String ping(@Valid ConferenceDto conferenceDto, Errors errors) throws IOException {
         if (errors.hasErrors()) {
             return CONFERENCE_PAGE;

src/main/resources/public/css/conference.css

@@ -77,6 +77,16 @@ body {
     border-right: 1px solid #ced4da;
 }
 
+#ping-button[disabled=disabled] {
+    background-color: #ced4da;
+    border-color: #c2c5c7;
+}
+
+#ping-button[disabled=disabled]:hover {
+    background-color: #737475 !important;
+    border-color: #5d5e5f !important;
+}
+
 #take-part[disabled=disabled] {
     background-color: #ced4da;
     border-color: #c2c5c7;

src/main/resources/templates/conferences/conference.html

@@ -122,9 +122,10 @@
                                 </div>
 
                                 <div class="form-group d-flex justify-content-between flex-wrap">
-                                    <input type="hidden" th:value="*{ping}" th:name="ping"/>
-                                    <input id="pingButton" class="btn btn-primary"
-                                           type="submit" name="ping" value="Ping участникам"/>
+                                    <!--<input type="hidden" th:value="*{ping}" th:name="ping"/>-->
+                                    <input id="ping-button" class="btn btn-primary"
+                                           type="submit" name="pingConference" value="Ping участникам"
+                                           th:disabled="*{id == null ? 'true' : 'false'}"/>
                                     <input type="hidden" th:value="*{disabledTakePart}" th:name="disabledTakePart"/>
                                     <input id="take-part" class="btn btn-primary"
                                            type="submit" name="takePart" value="Принять участие"