Tab: Make active tab clickable and add hyperlink functionality (#25546)

* onChangeTab for active tab and pointer mouse

* Add anchor element to tab

* Make a strict 'anchor' mode

* Add short docs

* Apply suggestions from code review

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

* Fix nits

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

packages/grafana-ui/src/components/Tabs/Tab.tsx

@@ -11,31 +11,41 @@ import { Counter } from './Counter';
 export interface TabProps extends HTMLProps<HTMLLIElement> {
   label: string;
   active?: boolean;
+  /** When provided, it is possible to use the tab as a hyperlink. Use in cases where the tabs update location. */
+  href?: string;
   icon?: IconName;
-  onChangeTab: () => void;
+  onChangeTab: (event?: React.MouseEvent<HTMLLIElement>) => void;
+  /** A number rendered next to the text. Usually used to display the number of items in a tab's view. */
   counter?: number;
 }
 
 export const Tab = React.forwardRef<HTMLLIElement, TabProps>(
-  ({ label, active, icon, onChangeTab, counter, className, ...otherProps }, ref) => {
+  ({ label, active, icon, onChangeTab, counter, className, href, ...otherProps }, ref) => {
     const theme = useTheme();
     const tabsStyles = getTabStyles(theme);
+    const content = () => (
+      <>
+        {icon && <Icon name={icon} />}
+        {label}
+        {typeof counter === 'number' && <Counter value={counter} />}
+      </>
+    );
 
     return (
       <li
         {...otherProps}
-        className={cx(tabsStyles.tabItem, active && tabsStyles.activeStyle)}
-        onClick={() => {
-          if (!active) {
-            onChangeTab();
-          }
-        }}
+        className={cx(!href && tabsStyles.padding, tabsStyles.tabItem, active && tabsStyles.activeStyle)}
+        onClick={onChangeTab}
         aria-label={otherProps['aria-label'] || selectors.components.Tab.title(label)}
         ref={ref}
       >
-        {icon && <Icon name={icon} />}
-        {label}
-        {typeof counter === 'number' && <Counter value={counter} />}
+        {href ? (
+          <a href={href} className={tabsStyles.padding}>
+            {content()}
+          </a>
+        ) : (
+          <>{content()}</>
+        )}
       </li>
     );
   }
@@ -47,7 +57,6 @@ const getTabStyles = stylesFactory((theme: GrafanaTheme) => {
   return {
     tabItem: css`
       list-style: none;
-      padding: 11px 15px 9px;
       margin-right: ${theme.spacing.md};
       position: relative;
       display: block;
@@ -61,18 +70,24 @@ const getTabStyles = stylesFactory((theme: GrafanaTheme) => {
         margin-right: ${theme.spacing.sm};
       }
 
+      a {
+        display: block;
+        height: 100%;
+      }
       &:hover,
       &:focus {
         color: ${colors.linkHover};
       }
     `,
+    padding: css`
+      padding: 11px 15px 9px;
+    `,
     activeStyle: css`
       label: activeTabStyle;
       border-color: ${theme.palette.orange} ${colors.pageHeaderBorder} transparent;
       background: ${colors.bodyBg};
       color: ${colors.link};
       overflow: hidden;
-      cursor: default;
 
       &::before {
         display: block;

packages/grafana-ui/src/components/Tabs/TabsBar.mdx

 import { Props } from '@storybook/addon-docs/blocks';
-import { TabsBar } from './TabsBar'
+import { TabsBar } from './TabsBar';
 
 # TabBar
 
-A composition component for rendering a TabBar with Tabs for navigation
+A composition component for rendering a TabBar with Tabs for navigation.
 
+It has two modes - navigation and onClick. Navigation renders it as a simple `<a>` element. To enable it, use the `href` prop. The onClick mode uses an onClick handler instead. To enable it, use the `onChangeTab` prop.
+
+**Warning!** Using `href` and `onChangeTab` at the same time may have unintended consequences.
 
 <Props of={TabsBar} />

public/app/core/components/PageHeader/PageHeader.tsx

@@ -79,6 +79,7 @@ const Navigation = ({ children }: { children: NavModelItem[] }) => {
                 key={`${child.url}-${index}`}
                 icon={child.icon as IconName}
                 onChangeTab={() => goToUrl(index)}
+                href={child.url}
               />
             )
           );