Datatable: cell memoization options and documentation

components/lib/datatable/BodyCell.js

@@ -691,14 +691,22 @@ export const RadioCheckCell = React.memo(
 
 RadioCheckCell.displayName = 'RadioCheckCell';
 
+const defaultKeysToCompare = ['rowData', 'field', 'allowCellSelection', 'isCellSelected', 'editMode', 'index', 'tabIndex', 'editing', 'expanded', 'editingMeta', 'frozenCol', 'alignFrozenCol'];
+
 export const BodyCell = React.memo(
     (props) => {
         return <Cell {...props} />;
     },
     (prevProps, nextProps) => {
-        const keysToCompare = ['field', 'allowCellSelection', 'isCellSelected', 'editMode', 'index', 'tabIndex', 'editing', 'expanded', 'editingMeta', 'rowData', 'frozenCol', 'alignFrozenCol'];
+        if (nextProps.cellMemo === false) return false;
 
-        return ObjectUtils.selectiveCompare(prevProps, nextProps, keysToCompare);
+        const memoProps = nextProps.cellMemoProps;
+        const keysToCompare = Array.isArray(memoProps) && memoProps.every((prop) => typeof prop === 'string') ? memoProps : defaultKeysToCompare;
+
+        const memoPropsDepth = nextProps.cellMemoPropsDepth;
+        const depth = typeof memoPropsDepth === 'number' && memoPropsDepth > 0 ? memoPropsDepth : 1;
+
+        return ObjectUtils.selectiveCompare(prevProps, nextProps, keysToCompare, depth);
     }
 );
 

components/lib/datatable/BodyRow.js

@@ -605,6 +605,9 @@ export const BodyRow = React.memo((props) => {
                 const cellProps = mergeProps({
                     hostName: props.hostName,
                     allowCellSelection: props.allowCellSelection,
+                    cellMemo: props.cellMemo,
+                    cellMemoProps: props.cellMemoProps,
+                    cellMemoPropsDepth: props.cellMemoPropsDepth,
                     cellClassName: props.cellClassName,
                     checkIcon: props.checkIcon,
                     collapsedRowIcon: props.collapsedRowIcon,

components/lib/datatable/DataTable.js

@@ -1688,6 +1688,9 @@ export const DataTable = React.forwardRef((inProps, ref) => {
             <TableBody
                 hostName="DataTable"
                 ref={frozenBodyRef}
+                cellMemo={props.cellMemo}
+                cellMemoProps={props.cellMemoProps}
+                cellMemoPropsDepth={props.cellMemoPropsDepth}
                 cellClassName={props.cellClassName}
                 cellSelection={props.cellSelection}
                 checkIcon={props.checkIcon}
@@ -1773,6 +1776,9 @@ export const DataTable = React.forwardRef((inProps, ref) => {
             <TableBody
                 hostName="DataTable"
                 ref={bodyRef}
+                cellMemo={props.cellMemo}
+                cellMemoProps={props.cellMemoProps}
+                cellMemoPropsDepth={props.cellMemoPropsDepth}
                 cellClassName={props.cellClassName}
                 cellSelection={props.cellSelection}
                 checkIcon={props.checkIcon}

components/lib/datatable/TableBody.js

@@ -1006,6 +1006,9 @@ export const TableBody = React.memo(
                         hostName={props.hostName}
                         allowCellSelection={_allowCellSelection}
                         allowRowSelection={_allowRowSelection}
+                        cellMemo={props.cellMemo}
+                        cellMemoProps={props.cellMemoProps}
+                        cellMemoPropsDepth={props.cellMemoPropsDepth}
                         cellClassName={props.cellClassName}
                         checkIcon={props.checkIcon}
                         collapsedRowIcon={props.collapsedRowIcon}

components/lib/datatable/datatable.d.ts

@@ -1101,6 +1101,45 @@ interface DataTableBaseProps<TValue extends DataTableValueArray> extends Omit<Re
      * @defaultValue 960px
      */
     breakpoint?: string | undefined;
+    /**
+     * Whether to enable cell memoization.
+     *
+     * When the memoization is enabled, be sure to:
+     *      1- Update the value prop (i.e., row data) to trigger a re-render of the cells of a given row.
+     *      2- Where necessary, use the spread operator (...) when updating the value prop objs which creates new fresh
+     *      objects and avoids mutating the same objects.
+     *
+     * When the memoization is disabled, a re-render of the datatable will trigger a re-render of all cells, which can
+     * lead to performance issues with large datasets and is therefore not recommended.
+     * @defaultValue true
+     */
+    cellMemo?: boolean;
+    /**
+     * The cell props to be checked at memoization.
+     *
+     * Possible cell props are:
+     *     'hostName', 'allowCellSelection', 'cellMemo', 'cellMemoProps', 'cellMemoPropsDepth', 'cellClassName', 'checkIcon', 'collapsedRowIcon',
+     *     'field', 'resolveFieldData', 'column', 'cProps', 'dataKey', 'editMode', 'editing', 'editingMeta', 'onEditingMetaChange', 'editingKey',
+     *     'getEditingRowData', 'expanded', 'expandedRowIcon', 'frozenRow', 'frozenCol', 'alignFrozenCol', 'index', 'isSelectable', 'onCheckboxChange',
+     *     'onClick', 'onMouseDown', 'onMouseUp', 'onRadioChange', 'onRowEditCancel', 'onRowEditInit', 'onRowEditSave', 'onRowToggle', 'responsiveLayout',
+     *     'rowData', 'rowEditorCancelIcon', 'rowEditorInitIcon', 'rowEditorSaveIcon', 'rowIndex', 'rowSpan', 'selectOnEdit', 'isRowSelected', 'isCellSelected',
+     *     'selectionAriaLabel', 'showRowReorderElement', 'showSelectionElement', 'tabIndex', 'getTabIndex', 'tableProps', 'tableSelector', 'value',
+     *     'getVirtualScrollerOption', 'ptCallbacks', 'metaData', 'unstyled', 'findNextSelectableCell', 'findPrevSelectableCell', 'findDownSelectableCell',
+     *     'findUpSelectableCell', 'focusOnElement', 'focusOnInit', 'updateStickyPosition'
+     *
+     * IMPORTANT: Including a function to be checked will in general disable the memoization in practice, since functions are
+     * compared by reference.
+     *
+     * @defaultValue ['rowData', 'field', 'allowCellSelection', 'isCellSelected', 'editMode', 'index', 'tabIndex',
+     * 'editing', 'expanded', 'editingMeta', 'frozenCol', 'alignFrozenCol']
+     */
+    cellMemoProps?: string[];
+    /**
+     * The comparison depth when checking cell props (e.g., rowData) at memoization.
+     *
+     * @defaultValue 1
+     */
+    cellMemoPropsDepth?: number;
     /**
      * Icon to display in the checkbox.
      */

components/lib/utils/ObjectUtils.js

@@ -635,9 +635,10 @@ export default class ObjectUtils {
      * @param {object} a - The first object to compare.
      * @param {object} b - The second object to compare.
      * @param {string[]} [keysToCompare] - The keys to compare. If not provided, performs a shallow comparison using absoluteCompare.
+     * @param {number} [maxDepth=1] - The maximum depth to compare if the variables are objects.
      * @returns {boolean} True if all specified properties are equal, false otherwise.
      */
-    static selectiveCompare(a, b, keysToCompare) {
+    static selectiveCompare(a, b, keysToCompare, maxDepth = 1) {
         if (a === b) return true;
         if (!a || !b || typeof a !== 'object' || typeof b !== 'object') return false;
         if (!keysToCompare) return this.absoluteCompare(a, b, 1); // If no keys are provided, the comparison is limited to one depth level.
@@ -649,7 +650,7 @@ export default class ObjectUtils {
             const isObject = typeof aValue === 'object' && aValue !== null && typeof bValue === 'object' && bValue !== null;
 
             // If the current key is an object, they are compared in one further level only.
-            if (isObject && !this.absoluteCompare(aValue, bValue, 1)) return false;
+            if (isObject && !this.absoluteCompare(aValue, bValue, maxDepth)) return false;
             if (!isObject && aValue !== bValue) return false;
         }
 

components/lib/utils/utils.d.ts

@@ -153,7 +153,7 @@ export declare class ObjectUtils {
     static sort(value1: any, value2: any, order: number, locale: string | string[]): number;
     static getNestedValue(obj: object, path: string): any;
     static absoluteCompare(objA: object, objB: object, maxDepth?: number, currentDepth?: number): boolean;
-    static selectiveCompare(a: object, b: object, keysToCompare?: string[]): boolean;
+    static selectiveCompare(a: object, b: object, keysToCompare?: string[], maxDepth?: number): boolean;
 }
 
 /**