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Using Buttons and RSVP Forms with your Tech Stack

Things to consider

There are 3 important things to consider before implementing.

1. Package/Plugin vs. CDN

Whether you want the script to be part of your core, managed via your usual package/plugin flows - or whether you want to load it via a script tag from an external CDN.

There are Pros and Cons for both approaches and it is completely up to you what you prefer. In doubt, it is about convenience and what you are used to. Mind that using it as a module requires you to keep it up-to-date manually!

2. Bundle Size

How important bundle size is to you, if you use the script as npm package.

If you are using the script in its plain version, you might wonder whether you can reduze the size of the script. Due to the nature of the script, this (e.g. tree-shaking) is not directly possible. However, you can load the unstyle version instead to save on css data you do not need. With this approach, you would need to make sure that events in the app are linked to a style AND at this style, the "load async" option is active. This makes sure the style gets loaded async via the jsDelivr CDN (make sure this is allowed at potential CORS settings).

3. User Flow

If you want links and files to be generated via the script on the client side or whether you want to use our Proxy service.

The first case will generate the links to the calendar sites dynamically directly in the browser. It will also generate the ics file that way. This is the fastest approach (from a user's perspective). However, ics generation gets blocked at some systems and if a calendar provider goes offline or has interal problems, the user will not be able to save an event.
With the proxy, links and files get generated on our side and the user gets redirected to to us first.
This way, when something does not work, we can tell the user about it and offer alternatives and guidance. It is more stable, but a little slower for the user.

You can control this setting at a style, which you then link to your event or group. If no style is set, the proxy will be the default.

General workflow

There are only 2 steps necessary to get RSVP forms and buttons showing up in your application.

  1. Load the script (via importing the package, loading the script via CDN, or via a plugin).
  2. Place an <add-to-calendar-button /> tag where you want the element to show up and add the proKey as attribute to it.
<add-to-calendar-button proKey="prokey-of-your-event" />

We automatically generate a proKey for every event you create. You can find it at the very top of the respective event page.

When you create an event via our API, you will receive the proKey as response.

It's client-side only!

Mind that the button only works on the client-side. Therefore, trying to render it on the server (e.g. with SSR or SSG prerendering), might lead to unexpected behavior.

Depending on your framework, you might want to wrap it into something like <ClientOnly></ClientOnly> (Nuxt) or add use client to the component (React).

Using it via CDN

Load the script by adding the following script tag to the head section of your website. The script will be loaded in a non-blocking way.

<script src="" async defer></script>

For the smaller unstyled version, it would be:

<script src="" async defer></script>

Using it via NPM

Install the package using the following npm command:

npm install add-to-calendar-button

Import the module into your project/component:

import 'add-to-calendar-button';

... or for the unstyled version:

import 'add-to-calendar-button/unstyle';

Based on your framework/library, you might need to make minor adjustments to the respective config.

Using it via Plugin

For some systems (like WordPress), we provide official plugins.

Usually, you can find them in the respective stores; but check the respective page in this documentation for details and to make sure you do not install wrong or malicious code.

Overwrite settings

Some parameters can be overwritten by adding them directly to the HTML tag.

This means that the value, put as attribute to the button integration, overrules a potential different setting at the app.

This can be useful, if custom style shall be defined within the code or you want to change some details dynamically. Latter one is quite limited and should be considered carefully! Usually, the better way to change things dynamically is via our API.

Make all settings overridable

You can set the option proOverride to the button and you will be able to override all available settings on the code level.

Be careful with that, as it can easily lead to mixed data, since any changes on the code level will not get reflected anywhere else at Add to Calendar PRO!

This, however, can be useful for special cases, where you want to only use the button on your website, where you only set the date there (maybe due to privacy reasons), while you want to have the style managed on the Add to Calendar PRO app (maybe by the marketing team).

Parameters, that can be always overwritten or even only set at the code level, are listed below.

AttributeDescriptionType / Format
debugLogs errors in the browser's JavaScript console and renders an error message instead of the button.Boolean
cspnonceNecessary if you are working with a strict Content Security Policy. Experimental! Currently only for JavaScript; CSS must be allowed inline.String
instanceTriggers a "re-render" of the button by changing/increasing the number.Number
attendeeScheme "NAME|E-MAIL" (for example, "John Doe|[email protected]") or just an email address. Only 1 entry possible. Enables the use of iCal status functionalities. Requires a set organizer. Enforces dynamic creation of ics files instead of retrieving the static file.String (NAME|EMAIL)
imagesEnhances the rich data details. 1-3 images via URL. It is recommended to use 3 images, each with a width of 1920px. One with an aspect ratio of 1x1, one with 4x3, and one with 16x9.Array (urls)
sizeAdjust scaling. 1-3 values. With multiple values, the first is set for large screens, the second for medium screens, and the third for small screens. With 2 values, the second applies to both medium and small screens.String (X|X|X)
inlineRenders the button inline instead of the default block style.Boolean
inlineRsvpRenders the RSVP form inline and not as a modal after clicking the button.Boolean
forceOverlayRenders dropdowns above all elements. Resource-intensive but necessary for some layouts.Boolean
customLabelsSee the relevant setting in the app for possible values. The structure must comply with a JSON schema.Object
customCssLoads a specified external CSS file (absolute path) instead of the integrated style.String (url)
lightModeDefines how the dark/light theme should be set. "system" is based on the user's operating system settings. "bodyScheme" switches to "dark" if the "atcb-dark" or "dark" class is set in the body or html tag.String (system, dark, light, bodyScheme)
styleLightSee the relevant setting in the app for possible values. Example: styleLight="--btn-background: #2f4377; --btn-text: #fff; --font: Georgia, 'Times New Roman', Times, serif;"String
styleDarkSee the relevant setting in the app for possible values. Example: styleDark="--btn-background: #2f4377; --btn-text: #fff;"String
languageLanguage of the button. Options: ar, cs, de, en, es, et, fa, fi, fr, hi, id, it, ja, ko, nl, no, ro, pl, pt, sv, tr, vi, zhString
blockInteractionBlocks any interaction with the button, with the exception of hover effects.Boolean
disabledDisables the button and shows it in a grey state.Boolean
hiddenHides the button completely.Boolean
bypassWebViewCheckFor users who load the button on their iPhone in a WebView environment (such as the Instagram browser), we cannot offer the ics file directly for download. Therefore, in this case, we show a small tutorial on how to save the event instead. If you use the button in your own application, where you can allow the download of ics files in the default browser, you can bypass this workaround with the option bypassWebViewCheck.Boolean
proxyRoutes the user via the landingpage when clicking a button option. This comes with some better user guidance, but might require you to update your privacy policy.

This option needs to be set when you want to track click on Add to Calendar Buttons!
customVarDefine custom variables, which then can be used in your event's description and location fields. The structure must comply with a JSON schema. A field "name" can be used via %%name%% in the description or location.Object
fakeMobileSimulates a mobile device.Boolean
fakeIOSSimulates iOS.Boolean
fakeAndroidSimulates Android.Boolean