---
title: "React Event calendar Custom Header Example | Mobiscroll"
component: "Event calendar"
framework: "React"
library_version: "6.2.0"
url: "https://demo.mobiscroll.com/react/eventcalendar/customizing-header"
---

# Custom Header - React Event calendar demo

Customize the React event calendar header — rearrange navigation controls, toggle calendar/scheduler views or add any custom action. For React and Next.JS.

- [Live demo](https://demo.mobiscroll.com/react/eventcalendar/customizing-header)
- [View React JS code on GitHub](https://github.com/acidb/mobiscroll-demos-react/tree/main/src/demos/eventcalendar/calendar-view/customizing-header)
- [View React TS code on GitHub](https://github.com/acidb/mobiscroll-demos-react-ts/tree/main/src/demos/eventcalendar/calendar-view/customizing-header)
- This demo in other frameworks: [JavaScript](https://demo.mobiscroll.com/javascript/eventcalendar/customizing-header.md), [jQuery](https://demo.mobiscroll.com/jquery/eventcalendar/customizing-header.md), [Angular](https://demo.mobiscroll.com/angular/eventcalendar/customizing-header.md), [Vue](https://demo.mobiscroll.com/vue/eventcalendar/customizing-header.md)

## Description

You can customize how the header of the event calendar looks and how the components are arranged. Besides that you can also add custom functionality, like a segmented control that lets people switch between calendar and scheduler.

Use the [`renderHeader`](https://mobiscroll.com/docs/react/eventcalendar/api#renderer-renderHeader) option for passing a custom header layout. There are predefined components - shorthands if you will - that can be used to assemble the header:

- **Navigation component** - `<CalendarNav />`. Use the `.md-header-filter-controls` CSS class for custom overrides.
- **Today button** - `<CalendarToday />`. Use the `.md-header-filter-today` CSS class for custom overrides.
- **Previous month button** - `<CalendarPrev />`. Use the `.md-header-filter-prev` CSS class for custom overrides.
- **Next month button** - `<CalendarNext />`. Use the `.md-header-filter-next` CSS class for custom overrides.

For changing the order the controls are laid out, you only need to set up the `renderHeader`. This example sets a consistent order and layout across all themes and shows a custom control at the far right end.

**Overriding the order for specific themes**

For a custom order on a theme to theme basis, you will need to use a little CSS. [Flex layout](https://css-tricks.com/snippets/css/a-guide-to-flexbox/) makes reordering easy. It's just a matter of setting the order in CSS. For material use the `.mbsc-material`, for windows the `.mbsc-windows` prefix and for iOS it is `.mbsc-ios` class. Eg.:

```
.mbsc-material .md-header-filter-prev { order: 1; }
            .mbsc-material .md-header-filter-next { order: 2; }
            .mbsc-material .md-header-filter-controls { order: 3; }
            .mbsc-material .md-header-filter-today { order: 4; }
```

**Want to add a filter to the header?** [Check out the next example →](https://demo.mobiscroll.com/react/eventcalendar/resource-filtering-in-header)

## What this demo shows

- A desktop month-view event calendar is shown with a custom header and a view switcher that toggles between calendar and scheduler-style layouts.
- **Header** The left side shows the currently displayed month and year. The center contains previous and next month navigation arrows with a blue `Today` button between them for jumping back to the current date. The right side contains a segmented control with a calendar icon selected by default and a list icon for switching views.
- **Event labels** Days with events display labels directly inside the month cells. Labels use different styles and colors to distinguish all-day events, multi-day, and timed events.
- **Overflow handling** The number of visible event labels depends on the available vertical space in the day cell. Additional events are moved into a popover and indicated by an `X more` label, where `X` represents the number of hidden events. Clicking it opens a popover that lists the remaining events for that day.
- **Label interaction** Hovering over or clicking an event label selects it and highlights the selected label. This is tru in both views, event calendar month view and the scheduler week view.
- **Day cell states** Hovering a day cell highlights the day number with a gray background, while clicking the empty part of the cell selects the day and highlights the day number with a blue background.
- **Month navigation** The month can be changed by clicking and dragging the calendar left or right.
- **Scheduler view** Selecting the list option from the segmented control switches the layout to a weekly scheduler view.
- **Scheduler view** The weekly scheduler shows the days of the week at the top, an all-day section for all-day events, and a 24-hour time grid for timed events.
- **Scheduler view** The current time is marked with a blue line in the time grid.
- **Scheduler view** The time grid can be scrolled vertically with the mouse wheel while the header stays sticky.

## Best for

- **Calendar and schedule switching** Interfaces where users need to move between a month overview and a more detailed weekly schedule from the same header control.
- **Desktop planning tools** Scheduling and planning screens designed for desktop use, where a full month grid and richer header controls fit naturally.
- **Operational scheduling** Team, resource, booking, or internal planning tools where users switch between high-level monthly planning and time-precise weekly scheduling.

## API used in this demo

- [`theme`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-theme) - option
- [`themeVariant`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-themeVariant) - option
- [`labels`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-labels) - option
- [`cssClass`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-cssClass) - option
- [`clickToCreate`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-clickToCreate) - option
- [`dragToCreate`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-dragToCreate) - option
- [`dragToMove`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-dragToMove) - option
- [`dragToResize`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-dragToResize) - option
- [`eventDelete`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-eventDelete) - option
- [`onSelectedDateChange`](https://mobiscroll.com/docs/react/eventcalendar/api#event-onSelectedDateChange) - event
- [`selectedDate`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-selectedDate) - option
- [`renderHeader`](https://mobiscroll.com/docs/react/eventcalendar/api#renderer-renderHeader) - renderer
- [`view`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-view) - option
- [`data`](https://mobiscroll.com/docs/react/eventcalendar/api#opt-data) - option

## Code

### JSX

```jsx
import {
  Button,
  CalendarNav,
  CalendarToday,
  Eventcalendar,
  getJson,
  Segmented,
  SegmentedGroup,
  setOptions,
} from '@mobiscroll/react';
import { useCallback, useEffect, useState } from 'react';

setOptions({
  theme: 'ios',
  themeVariant: 'light'
});

function App() {
  const [view, setView] = useState('calendar');
  const [myEvents, setEvents] = useState([]);
  const [currentDate, setCurrentDate] = useState(new Date());
  const [calView, setCalView] = useState({ calendar: { labels: true } });

  const changeView = useCallback((event) => {
    let calendarView;
    switch (event.target.value) {
      case 'calendar':
        calendarView = {
          calendar: {
            labels: true,
          },
        };
        break;
      case 'schedule':
        calendarView = {
          scheduler: {
            type: 'week',
          },
        };
        break;
    }
    setView(event.target.value);
    setCalView(calendarView);
  }, []);

  const handleSelectedDateChange = useCallback((event) => {
    setCurrentDate(event.date);
  }, []);

  const getFirstDayOfWeek = useCallback((d, prev) => {
    const day = d.getDay();
    const diff = d.getDate() - day + (prev ? -7 : 7);
    return new Date(d.setDate(diff));
  }, []);

  const navigatePage = useCallback(
    (prev) => {
      if (view == 'calendar') {
        const prevNextPage = new Date(currentDate.getFullYear(), currentDate.getMonth() + (prev ? -1 : 1), 1);
        setCurrentDate(prevNextPage);
      } else {
        const prevNextSunday = getFirstDayOfWeek(currentDate, prev);
        setCurrentDate(prevNextSunday);
      }
    },
    [view, currentDate, getFirstDayOfWeek],
  );

  const customWithNavButtons = useCallback(
    () => (
      <>
        <CalendarNav className="md-custom-header-nav" />
        <div className="md-custom-header-controls">
          <Button onClick={() => navigatePage(true)} icon="material-arrow-back" variant="flat" className="md-custom-header-button"></Button>
          <CalendarToday className="md-custom-header-today" />
          <Button
            onClick={() => navigatePage(false)}
            icon="material-arrow-forward"
            variant="flat"
            className="md-custom-header-button"
          ></Button>
        </div>
        <div className="md-custom-header-view">
          <SegmentedGroup value={view} onChange={changeView}>
            <Segmented value="calendar" icon="calendar" />
            <Segmented value="schedule" icon="material-list" />
          </SegmentedGroup>
        </div>
      </>
    ),
    [changeView, navigatePage, view],
  );

  useEffect(() => {
    getJson(
      'https://trial.mobiscroll.com/events/?vers=5',
      (events) => {
        setEvents(events);
      },
      'jsonp',
    );
  }, []);

  return (
    <Eventcalendar
      cssClass="md-custom-header"
      clickToCreate={true}
      dragToCreate={true}
      dragToMove={true}
      dragToResize={true}
      eventDelete={true}
      onSelectedDateChange={handleSelectedDateChange}
      selectedDate={currentDate}
      renderHeader={customWithNavButtons}
      view={calView}
      data={myEvents}
    />
  );
}

export default App;
```

### TSX

```tsx
import {
  Button,
  CalendarNav,
  CalendarToday,
  Eventcalendar,
  getJson,
  MbscCalendarEvent,
  MbscEventcalendarView,
  MbscSelectedDateChangeEvent,
  SegmentedGroup,
  SegmentedItem,
  setOptions,
} from '@mobiscroll/react';
import { ChangeEvent, FC, useCallback, useEffect, useState } from 'react';

setOptions({
  theme: 'ios',
  themeVariant: 'light'
});

const App: FC = () => {
  const [view, setView] = useState('schedule');
  const [myEvents, setEvents] = useState<MbscCalendarEvent[]>([]);
  const [currentDate, setCurrentDate] = useState<Date>(new Date());
  const [calView, setCalView] = useState<MbscEventcalendarView>({ calendar: { labels: true } });

  const changeView = (event: ChangeEvent<HTMLInputElement>) => {
    let calendarView = {};
    switch (event.target.value) {
      case 'calendar':
        calendarView = {
          calendar: {
            labels: true,
          },
        };
        break;
      case 'schedule':
        calendarView = {
          scheduler: {
            type: 'week',
          },
        };
        break;
    }

    setView(event.target.value);
    setCalView(calendarView);
  };

  const handleSelectedDateChange = useCallback(
    (event: MbscSelectedDateChangeEvent) => {
      setCurrentDate(new Date(event.date as string));
    },
    [setCurrentDate],
  );

  const getFirstDayOfWeek = useCallback((d: Date, prev: boolean) => {
    const day = d.getDay();
    const diff = d.getDate() - day + (prev ? -7 : 7);
    return new Date(d.setDate(diff));
  }, []);

  const navigatePage = useCallback(
    (prev: boolean) => {
      if (view === 'calendar') {
        const prevNextPage = new Date(currentDate.getFullYear(), currentDate.getMonth() + (prev ? -1 : 1), 1);
        setCurrentDate(prevNextPage);
      } else {
        const prevNextSunday = getFirstDayOfWeek(currentDate, prev);
        setCurrentDate(prevNextSunday);
      }
    },
    [view, currentDate, setCurrentDate, getFirstDayOfWeek],
  );

  const customWithNavButtons = () => (
    <>
      <CalendarNav className="md-custom-header-nav" />
      <div className="md-custom-header-controls">
        <Button onClick={() => navigatePage(true)} icon="material-arrow-back" variant="flat" className="md-custom-header-button"></Button>
        <CalendarToday className="md-custom-header-today" />
        <Button
          onClick={() => navigatePage(false)}
          icon="material-arrow-forward"
          variant="flat"
          className="md-custom-header-button"
        ></Button>
      </div>
      <div className="md-custom-header-view">
        <SegmentedGroup value={view} onChange={changeView}>
          <SegmentedItem value="schedule" icon="material-list" />
          <SegmentedItem value="calendar" icon="calendar" />
        </SegmentedGroup>
      </div>
    </>
  );

  useEffect(() => {
    getJson(
      'https://trial.mobiscroll.com/events/?vers=5',
      (events: MbscCalendarEvent[]) => {
        setEvents(events);
      },
      'jsonp',
    );
  }, []);

  return (
    <Eventcalendar
      clickToCreate={true}
      dragToCreate={true}
      dragToMove={true}
      dragToResize={true}
      eventDelete={true}
      onSelectedDateChange={handleSelectedDateChange}
      selectedDate={currentDate}
      renderHeader={customWithNavButtons}
      view={calView}
      data={myEvents}
      cssClass="md-custom-header"
    />
  );
};
export default App;
```

### CSS

```css
.md-custom-header-controls {
  display: flex;
  flex: 1 0 auto;
  justify-content: center;
  align-items: center;
}

.md-custom-header-nav,
.md-custom-header-view {
  width: 180px;
}

.md-custom-header-button.mbsc-button {
  font-size: 20px;
  height: auto;
  padding: 0;
  margin: 0;
}

.md-custom-header .mbsc-segmented {
  width: 110px;
  float: right;
  margin-top: 0;
  margin-bottom: 0;
}

.md-custom-header .mbsc-material.mbsc-segmented,
.md-custom-header .mbsc-windows.mbsc-segmented {
  padding: 0;
}

.md-custom-header .mbsc-segmented .mbsc-segmented-button {
  font-size: 20px;
  height: 32px;
  padding: 0;
}
```

## Implementation notes

- Define two view configs toggled by a state variable: calendar uses `{ calendar: { labels: true } }`; schedule uses `{ scheduler: { type: 'week' } }`.
- Use `renderHeader` (Angular: `headerTemplate`, Vue: `header` slot) to build a fully custom header with three zones:
  - Left: `CalendarNav` for the month/year title
  - Center: two flat icon `Button` components (`material-arrow-back` and `material-arrow-forward`) flanking `CalendarToday` - these replace the built-in `CalendarPrev`/`CalendarNext`
  - Right: an icon-only `SegmentedGroup` with a `calendar` icon and a `material-list` icon for switching between views
- Track the currently displayed date in a `selectedDate` state variable, kept in sync via `onSelectedDateChange`. The custom prev/next buttons call a `navigatePage()` helper that computes the target date based on the active view: in calendar view, it adds or subtracts one month; in schedule view, it adds or subtracts one week. Update `selectedDate` with the result to drive navigation. JS/jQuery: call `inst.navigate(date)` instead of updating a bound prop.
- Load events from a remote endpoint using `getJson` and assign them to `data`; for the imperative API, call `inst.setEvents(events)` in the callback.

## Run it in your project

1. If not signed up yet, or don't own a license, you can [start a free trial](https://mobiscroll.com/starttrial).

2. Clone the repository:

   ```
   git clone https://github.com/acidb/mobiscroll-demos-react.git
   ```

3. If not installed yet, install the Mobiscroll CLI from NPM:

   ```
   npm install -g @mobiscroll/cli
   ```

4. Config Mobiscroll - open a terminal window in the root directory and run:

   ```
   mobiscroll config react
   ```

5. Install dependencies - open a terminal window in the root directory and run:

   ```
   npm install
   ```

6. Run the project:

   ```
   npm run dev
   ```

On a trial, add `--trial` to the config command: `mobiscroll config react --trial`.

Running a demo locally requires a Mobiscroll trial or a license; setup is per framework at https://mobiscroll.com/docs/react/getting-started/installation

## Related demos

- Previous: [Event Popover](https://demo.mobiscroll.com/react/eventcalendar/customize-event-popover.md) - Customize how events appear in the day popover of a React event calendar — use full custom layouts or add fields like assignee, location, and participants.
- Next: [Custom Event Tooltip](https://demo.mobiscroll.com/react/eventcalendar/custom-event-tooltip.md) - Add custom hover tooltips to a React event calendar — show appointment details, status, location, and confirm or delete actions to each event.