Data events let you automate actions in your app when certain events occur, such as record loading, editing, validating, saving, or value changes. Actions can include custom alerts, validation messages, setting field values, updating choices, labels, descriptions, and visibility, making HTTP requests, and more.

With Data Events, you can respond to record changes, update values programmatically, build dynamic hyperlinks, enforce quality logic, and extend your app using standard JavaScript.
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You can build out simple extensions or construct highly sophisticated applications with these components using standard JavaScript. Data Events essentially provide a flexible set of tools to control exactly what happens when your team collects data in Fulcrum.

To access the data event builder, click on the Data Events button in the right side of the app designer within the app settings section. Just above the save buttons.

After you click on the Data Events button, you are taken to data event builder.

Within the Data Event Builder there are three options worth mentioning.

From this option, you will be able to see a list of all the available fields for your app and select them to add them to the code. This will save you time, as you don't need to go to the app details to remember the name of the field you need to use for your function.
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This option allows you to click on an existing function to add it to the Data Event Builder by clicking on the function name. If you want to learn more about each of the functions from this list, simply click on the function's description, and you will be redirected to the Developer's Guide page for the specific function you clicked on.

Here you can customize the Data Event Builder so that it is easier for you to work with it. Among the options you can modify you will find the theme (light or dark), font size, code options (default or strict), and wrap text (on or off)