---
title: "Add a category filter"
manual: "Fullcalendar"
version: "5.0"
permalink: "https://docs.typo3.org/permalink/mediaessenz/fullcalendar:quick-filter@5.0"
source: "QuickStart/Filter.rst"
rendered: "2026-10-25T19:39:57+00:00"
---

<a id="filter"></a>

# Add a category filter {#quick-filter}

The filter lets visitors show and hide events by category. It consists of one or
more *category filters*, each a group of categories.

1.  Create a record **Category filter** in a folder.

    ![The category filter record with title and categories](../Images/CategoryFilterRecord.png)
1.  Enter a title (shown as headline of the group) and select the categories of the group.
1.  Select the filter in the plugin, sheet [Event filter](https://docs.typo3.org/permalink/mediaessenz/fullcalendar:plugin-sheet-filter@5.0).

    ![Plugin tab Event filter with category filters, filter root, excludes and prefilter](../Images/PluginEventFilter.png)
1.  Make sure the header or footer toolbar contains the button **Filter**
    ([header and footer](https://docs.typo3.org/permalink/mediaessenz/fullcalendar:plugin-sheet-header@5.0)). It is part of the default toolbar.

A click on the button opens the filter:

![The filter modal of the calendar with a group of categories and colored checkboxes](../Images/FrontendFilter.png)

## How the groups work {#how-the-groups-work}

-   Within a group, every checked category shows its events (OR).
-   An event is only visible if it matches **every** group (AND). So with two
    groups, e.g. "Topic" and "Location", an event needs a category of each group.
-   The checkboxes use the color of the category.
-   Categories restricted to frontend user groups are only shown to these users.
-   The choice of the visitor is saved in the browser (local storage).