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Fields are used to define most UI elements on a block. Examples of fields
include string labels, images, inputs for literal data such as strings and
numbers, and rich editors like date pickers and angle pickers. The simplest
example of a field is the math_number block, which uses a field_number to
let the user type a number.
Blockly provides several fields by default to handle a variety of user input.
These can be customized through field-specific configuration or with validators,
which tell a field how to handle specific content in a standard editor.
If you need a fully custom field it takes a bit more work and you'll want to
read most of the fields documentation. Start by learning about the parts
that make up a field or the overview of creating custom fields.
[null,null,["Last updated 2025-06-24 UTC."],[[["Fields are the primary components for defining UI elements within blocks, encompassing various input types like text, numbers, and specialized editors."],["Blockly offers a range of built-in fields that can be further tailored using configuration options or validators for content handling."],["For unique UI requirements, developers can create custom fields by understanding their structure and following the customization guidelines."]]],["Fields define UI elements on blocks, including labels, images, and data inputs like strings, numbers, date, and angles. Blockly offers built-in fields customizable through configuration or validators. For unique needs, users can develop custom fields. The documentation details built-in fields, validators, field anatomy, and custom field creation. If you want to show meta-information about a block, use an icon.\n"]]
