Fix for DxcDatagrid state maintenance using hierarchy + selectable rows

apps/website/screens/components/data-grid/code/examples/hierarchicalSelectable.ts

@@ -2,7 +2,7 @@ import { DxcDataGrid, DxcInset } from "@dxc-technology/halstack-react";
 import { useState } from "react";
 
 const code = `() => {
-  const columns = [
+  const [columns] = useState([
     {
       key: "name",
       label: "Label",
@@ -14,9 +14,9 @@ const code = `() => {
       alignment: "right",
       summaryKey: "total"
     },
-  ];
-  
-  const rows = [
+  ]);
+
+  const [rows] = useState([
     {
         name: "Root Node 1",
         value: "1",
@@ -75,7 +75,7 @@ const code = `() => {
             },
         ],
     },
-  ];
+  ]);
 
   const [selectedRows, setSelectedRows] = useState(new Set());
   return (

packages/lib/src/data-grid/DataGrid.tsx

@@ -18,6 +18,7 @@ import {
   getPaginatedNodes,
   getMinItemsPerPageIndex,
   getMaxItemsPerPageIndex,
+  expandRow,
 } from "./utils";
 import DxcPaginator from "../paginator/Paginator";
 import { DxcActionsCell } from "../table/Table";
@@ -171,7 +172,7 @@ const DxcDataGrid = ({
   totalItems,
   defaultPage = 1,
 }: DataGridPropsType): JSX.Element => {
-  const [rowsToRender, setRowsToRender] = useState<GridRow[] | HierarchyGridRow[] | ExpandableGridRow[]>(rows);
+  const [rowsToRender, setRowsToRender] = useState<GridRow[] | HierarchyGridRow[] | ExpandableGridRow[]>([...rows]);
   const [page, changePage] = useState(defaultPage);
   const [colHeight, setColHeight] = useState(36);
 
@@ -292,20 +293,14 @@ const DxcDataGrid = ({
   useEffect(() => {
     const finalRows = [...rows];
     if (expandable) {
-      rows.forEach((row, index) => {
-        if (
-          row.contentIsExpanded &&
-          !rows.some((row) => row[uniqueRowId] === `${rowKeyGetter(row, uniqueRowId)}_expanded`)
-        ) {
-          addRow(finalRows, index + 1, {
-            isExpandedChildContent: row.contentIsExpanded,
-            [uniqueRowId]: `${rowKeyGetter(row, uniqueRowId)}_expanded`,
-            expandedChildContent: row.expandedContent,
-            triggerRowKey: rowKeyGetter(row, uniqueRowId),
-            expandedContentHeight: row.expandedContentHeight,
-          });
-        }
-      });
+      finalRows
+        .filter((row) => {
+          const rowId = rowKeyGetter(row, uniqueRowId);
+          return row.contentIsExpanded && !rows.some((r) => r[uniqueRowId] === `${rowId}_expanded`);
+        })
+        .forEach((row) => {
+          expandRow(row, finalRows, uniqueRowId);
+        });
     }
     setRowsToRender(finalRows);
   }, [rows]);

packages/lib/src/data-grid/utils.tsx

@@ -59,6 +59,35 @@ export const renderSortStatus = ({ sortDirection }: RenderSortStatusProps) => (
   </div>
 );
 
+/**
+ * Expands a given row by inserting a new child row with the expanded content.
+ * @param {ExpandableGridRow} row - The row object to expand.
+ * @param {ExpandableGridRow[]} rows - The current list of all rows (as rendered).
+ * @param {string} uniqueRowId - Unique identifier key used for each row.
+ */
+export const expandRow = (row: ExpandableGridRow, rows: ExpandableGridRow[], uniqueRowId: string) => {
+  const rowIndex = rows.findIndex((r) => r === row);
+  addRow(rows, rowIndex + 1, {
+    isExpandedChildContent: true,
+    [uniqueRowId]: `${rowKeyGetter(row, uniqueRowId)}_expanded`,
+    expandedChildContent: row.expandedContent,
+    triggerRowKey: rowKeyGetter(row, uniqueRowId),
+    expandedContentHeight: row.expandedContentHeight,
+  });
+};
+
+/**
+ * Collapses a given row by removing its expanded child row.
+ * @param {ExpandableGridRow} row - The row object to collapse.
+ * @param {ExpandableGridRow[]} rows - The current list of all rows (as rendered).
+ */
+export const collapseRow = (row: ExpandableGridRow, rows: ExpandableGridRow[]) => {
+  const rowIndex = rows.findIndex((r) => r === row);
+  const newRows = [...rows];
+  deleteRow(newRows, rowIndex + 1);
+  return newRows;
+};
+
 /**
  * Renders an expandable trigger icon that toggles row expansion.
  * @param {ExpandableGridRow} row - Row object that can be expanded or collapsed.
@@ -80,25 +109,13 @@ export const renderExpandableTrigger = (
     onClick={() => {
       row.contentIsExpanded = !row.contentIsExpanded;
       if (row.contentIsExpanded) {
-        const rowIndex = rows.findIndex((rowToRender) => row === rowToRender);
         setRowsToRender((currentRows) => {
-          const newRows = [...currentRows];
-          addRow(newRows, rowIndex + 1, {
-            isExpandedChildContent: row.contentIsExpanded,
-            [uniqueRowId]: `${rowKeyGetter(row, uniqueRowId)}_expanded`,
-            expandedChildContent: row.expandedContent,
-            triggerRowKey: rowKeyGetter(row, uniqueRowId),
-            expandedContentHeight: row.expandedContentHeight,
-          });
-          return newRows;
+          const finalRows = [...currentRows];
+          expandRow(row, finalRows, uniqueRowId);
+          return finalRows;
         });
       } else {
-        const rowIndex = rows.findIndex((rowToRender) => row === rowToRender);
-        setRowsToRender((currentRows) => {
-          const newRows = [...currentRows];
-          deleteRow(newRows, rowIndex + 1);
-          return newRows;
-        });
+        setRowsToRender((currentRows) => collapseRow(row, [...currentRows]));
       }
     }}
     disabled={!rows.some((row) => uniqueRowId in row)}
@@ -136,11 +153,9 @@ export const renderHierarchyTrigger = (
         });
       } else {
         // The children of the row that is being collapsed are added to an array
-        const rowsToRemove: HierarchyGridRow[] = [
-          ...rows.filter(
-            (rowToRender) => rowToRender.parentKey && rowToRender.parentKey === rowKeyGetter(triggerRow, uniqueRowId)
-          ),
-        ];
+        const rowsToRemove: HierarchyGridRow[] = rows.filter(
+          (rowToRender) => rowToRender.parentKey && rowToRender.parentKey === rowKeyGetter(triggerRow, uniqueRowId)
+        );
         // The children are checked if any of them has any other children of their own
         const rowsToCheck = [...rowsToRemove];
         while (rowsToCheck.length > 0) {