Tutorial - Cascading Dropdowns & Auto-Selecting Values Based on Another Field
Building smart, dynamic dropdowns is one of the most common needs in a form. Sometimes you want Dropdown B to filter its options based on Dropdown A (classic cascading dropdown). Other times, you don't want filtering at all, you only want Dropdown B to auto-select a recommended value based on what the user picked in Dropdown A.
This guide covers both techniques, from filtering to auto-mapping.