Add update/delete to the web-ui sample

Closes gh-4735
See gh-4733

spring-boot-samples/spring-boot-sample-web-ui/src/main/resources/templates/messages/form.html

@@ -26,6 +26,10 @@
             Messages
           </a>
         </div>
+        <input type="hidden"
+               th:field="*{id}"
+               th:class="${#fields.hasErrors('id')} ? 'field-error'"
+        />
         <label for="summary">Summary</label>
         <input type="text"
             th:field="*{summary}"
@@ -35,7 +39,7 @@
             th:field="*{text}"
             th:class="${#fields.hasErrors('text')} ? 'field-error'"></textarea>
         <div class="form-actions">
-          <input type="submit" value="Create"/>
+          <input type="submit" value="Save"/>
         </div>
       </form>
     </div>

spring-boot-samples/spring-boot-sample-web-ui/src/main/resources/templates/messages/view.html

@@ -37,6 +37,17 @@
           A detailed message that is longer than the summary.
         </dd>
       </dl>
+      <div class="pull-left">
+        <a href="messages"
+           th:href="@{'/delete/' + ${message.id}}">
+          delete
+        </a>
+        |
+        <a href="form.html"
+           th:href="@{'/modify/' + ${message.id}}">
+          modify
+        </a>
+      </div>
     </div>
   </body>
 </html>