Added Html utility for creating Tabs (Like on Performance tab) easily.

Plan/src/main/java/com/djrapitops/plan/utilities/html/Html.java

@@ -51,6 +51,11 @@ public enum Html {
     DIV_W_CLASS_STYLE("<div class=\"${0}\" style=\"${1}\">${2}</div>"),
     //
     ROW("<div class=\"row\">${0}</div>"),
+    CARD("<div class=\"card\">${0}</div>"),
+    BODY("<div class=\"body\">${0}</div>"),
+    PANEL("<div class=\"panel panel-default\">${0}</div>"),
+    PANEL_BODY("<div class=\"panel-body\">${0}</div>"),
+
     //
     TABLE_END("</tbody></table>"),
     TABLE("<table class=\"table table-striped\">"),

Plan/src/main/java/com/djrapitops/plan/utilities/html/structure/TabsElement.java

@@ -0,0 +1,70 @@
+/*
+ * Licence is provided in the jar as license.yml also here:
+ * https://github.com/Rsl1122/Plan-PlayerAnalytics/blob/master/Plan/src/main/resources/license.yml
+ */
+package com.djrapitops.plan.utilities.html.structure;
+
+import com.djrapitops.plugin.utilities.Format;
+
+/**
+ * Represents a structural HTML element that has Tabs on the top.
+ *
+ * @author Rsl1122
+ */
+public class TabsElement {
+
+    private final Tab[] tabs;
+
+    public TabsElement(Tab... tabs) {
+        this.tabs = tabs;
+    }
+
+    public String toHtml() {
+        StringBuilder nav = new StringBuilder();
+        StringBuilder content = new StringBuilder();
+
+        nav.append("<ul class=\"nav nav-tabs tab-nav-right\" role=\"tablist\">");
+        content.append("<div class=\"tab-content\">");
+        boolean first = true;
+        for (Tab tab : tabs) {
+            String id = tab.getId();
+            String navText = tab.getNavText();
+            String contentHtml = tab.getContentHtml();
+
+            nav.append("<li role=\"presentation\"").append(first ? " class=\"active\"" : "")
+                    .append("><a href=\"#").append(id).append("\" data-toggle=\"tab\">")
+                    .append(navText).append("</a></li>");
+            content.append("<div role=\"tabpanel\" class=\"tab-pane fade").append(first ? " in active" : "")
+                    .append("\" id=\"").append(id).append("\">")
+                    .append(contentHtml).append("</div>");
+            first = false;
+        }
+        content.append("</div>");
+        nav.append("</ul>");
+
+        return nav.toString() + content.toString();
+    }
+
+    public static class Tab {
+
+        private final String navText;
+        private final String contentHtml;
+
+        public Tab(String navText, String contentHtml) {
+            this.navText = navText;
+            this.contentHtml = contentHtml;
+        }
+
+        public String getNavText() {
+            return navText;
+        }
+
+        public String getContentHtml() {
+            return contentHtml;
+        }
+
+        public String getId() {
+            return "tab_" + new Format(navText).removeSymbols().removeWhitespace().lowerCase().toString();
+        }
+    }
+}