# Trigger Events when typing
Events are special tags that let you send messages (string) to any listener script, once the typewriter has reached a specific part of the text. *(For this reason, events work only if the typewriter is enabled)*
Scene 'Example 3 - Events'
***
## Overview
You can write events in your text by using rich text tags.
### Formatting
Event’s messages are preceded by a question mark, like this: ``.
**Example:** To call an event named ‘shakeCamera’, write: ``
* 👍🏻 An event can have any kind of tag, including built-in effect’s ones.
* ⚠️ Events are case sensitive. Writing `` is not the same as writing ``. Be careful! (or use the `string.ToLower()` method in your scripts to account for that.)
### Parameters
Events can have one or multiple parameters (starting with the `=` sign for the first, and then separating the others with a comma `,`), to allow you to send multiple data to your scripts.
* One parameter: ``, will result in a message “eventID” and one parameter “parameter1”.
* Multiple parameters: ``, will result in a message “eventID” and parameters “p1” and “p2”.
***
## Listening to events
The scripts that you want to listen from events/messages must subscribe to the `onMessage` callback inside the `Typewriter` class. ([Scripting Api](https://www.api.febucci.com/tools/text-animator-unity/api/Febucci.UI.Core.TypewriterCore.html#Febucci_UI_Core_TypewriterCore_onMessage)).
Example:
```csharp
//Inside your script
public Febucci.UI.Core.TypewriterCore typewriter;
//Adds and removes listening to callback
void OnEnable() => typewriter.onMessage.AddListener(OnTypewriterMessage);
void OnDisable() => typewriter.onMessage.RemoveListener(OnTypewriterMessage);
//Does stuff based on event
void OnTypewriterMessage(Febucci.UI.Core.Parsing.EventMarker eventMarker)
{
switch (eventMarker.name)
{
case "something":
// do something
break;
}
}
```
👍🏻 Note how the “message” string has no ‘<‘, ‘?’ and ‘>’ characters, but only contains the message.
You can find the [EventMarker API here](https://www.api.febucci.com/tools/text-animator-unity/api/Febucci.UI.Core.Parsing.EventMarker.html), for example to get all the parameters of the event (if any).
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