Columns / Column style

Column-level styling targets the entire column body at once. Each leaf column accepts getColumnStyle for inline styles and getColumnClass/columnClassRules for CSS classes. Unlike cell-level callbacks, they receive a ColumnStyleParams (column, values, api, state) with every visible value of the column and are evaluated once per column per dataset revision — the result is cached and applied to each rendered cell in O(1). Each example starts with 10 rows; use Add row/Remove row to append or drop rows at the end of the dataset and watch the aggregates — and the column presentation — re-evaluate. For per-cell styling use cellStyle/getCellStyle/cellClass instead; cell-level styles override column-level styles where they overlap.