Custom Views via JS

For advanced developers, FullCalendar provides an API for building custom views with the unlimited flexibility of JavaScript code.

Config Object

You can define an “config object” with functions that execute rendering. Example:

import { sliceEvents, createPlugin } from '@fullcalendar/core';

const CustomViewConfig = {

  classNames: [ 'custom-view' ],

  content: function(props) {
    let segs = sliceEvents(props, true); // allDay=true
    let html =
      '<div class="view-title">' +
        props.dateProfile.currentRange.start.toUTCString() +
      '</div>' +
      '<div class="view-events">' +
        segs.length + ' events' +
      '</div>'

    return { html: html }
  }

}

export default createPlugin({
  views: {
    custom: CustomViewConfig
  }
});

The classNames property is a ClassName Input and the content property is a Content Injection Input.

Then, in another file:

import customViewPlugin from './custom-view-file.js';

let calendarEl = document.getElementById('calendar');
let calendar = new Calendar(calendarEl, {
  plugins: [ customViewPlugin ],
  initialView: 'custom'
});

View a runnable demo

Component

It is also possible to specify a Preact Component. Here’s an example that uses JSX:

import { h, Component, Fragment } from 'preact';
import { sliceEvents, createPlugin } from '@fullcalendar/core';

class CustomView extends Component {

  render(props) {
    let segs = sliceEvents(props, true); // allDay=true

    return (
      <Fragment>
        <div class='view-title'>
          {props.dateProfile.currentRange.start.toUTCString()}
        </div>
        <div class='view-events'>
          {segs.length} events
        </div>
      </Fragment>
    );
  }

}

export default createPlugin({
  views: {
    custom: CustomView
  }
});

If you’re using the React connector you can specify a React component instead.

Props

Both the config and component techniques receive “props”, an object with information about the current view. You’ll need to look at the FullCalendar v5 source code to see exactly what’s in props.

Other Considerations

The above documentation is helpful for building a barebones view, but making it full-featured and interactive is a further challenge. A robust view should be right-to-left compatible, locale-customizable, allow event dragging and resizing, allow user selections, and more…

Making a full-featured view is beyond the scope of this document. Further documentation should be written and further APIs should be formalized, but for now, it would be best to browse FullCalendar’s source on GitHub.