---
title: "Custom Detail"
enterprise: true
framework: react
version: "36.1.0"
---

# Custom Detail

When a Master Row is expanded, the grid uses the default Detail Cell Renderer to create and display the Detail Grid inside one row of the Master Grid. You can provide a custom Detail Cell Renderer to display something else if the default Detail Cell Renderer doesn't do what you want.

Configure the grid to use a custom Detail Cell Renderer using the grid property `detailCellRenderer`.

```jsx
// normally left blank, the grid will use the default Detail Cell Renderer
const detailCellRenderer = 'myCellRendererComp';
// params sent to the Detail Cell Renderer, in this case your MyCellRendererComp
const detailCellRendererParams = useMemo(() => { 
	return {};
}, []);

<AgGridReact
    detailCellRenderer={detailCellRenderer}
    detailCellRendererParams={detailCellRendererParams}
/>
```

The Detail Cell Renderer should be a [Cell Renderer](https://www.ag-grid.com/archive/36.1.0/react-data-grid/component-cell-renderer/) component. See [Cell Renderer](https://www.ag-grid.com/archive/36.1.0/react-data-grid/component-cell-renderer/) on how to build and register a Cell Renderer with the grid.

The following examples demonstrate minimalist custom Detail Cell Renderer. Note that where a Detail Grid would normally appear, only the message "My Custom Detail" is shown.

#### Simple Detail Cell Renderer

```tsx
"use client";

import React, {
  useCallback,
  useMemo,
  useRef,
  useState,
  StrictMode,
} from "react";
import { createRoot } from "react-dom/client";
import { AgGridReact, AgGridProvider } from "ag-grid-react";
import {
  ClientSideRowModelModule,
  ColDef,
  ColGroupDef,
  FirstDataRenderedEvent,
  GridApi,
  GridOptions,
  ModuleRegistry,
  RowApiModule,
  enableDevValidations,
} from "ag-grid-community";
import {
  ColumnMenuModule,
  ColumnsToolPanelModule,
  ContextMenuModule,
  MasterDetailModule,
} from "ag-grid-enterprise";
import DetailCellRenderer from "./detailCellRenderer.tsx";
import { IAccount } from "./interfaces";
import { useFetchJson } from "./useFetchJson";

if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

const modules = [
  RowApiModule,
  ClientSideRowModelModule,
  ColumnsToolPanelModule,
  MasterDetailModule,
  ColumnMenuModule,
  ContextMenuModule,
];

const GridExample = () => {
  const containerStyle = useMemo(() => ({ width: "100%", height: "100%" }), []);
  const gridStyle = useMemo(() => ({ height: "100%", width: "100%" }), []);

  const detailCellRenderer = useCallback(DetailCellRenderer, []);
  const [columnDefs, setColumnDefs] = useState<ColDef[]>([
    // group cell renderer needed for expand / collapse icons
    { field: "name", cellRenderer: "agGroupCellRenderer" },
    { field: "account" },
    { field: "calls" },
    { field: "minutes", valueFormatter: "x.toLocaleString() + 'm'" },
  ]);
  const defaultColDef = useMemo<ColDef>(() => {
    return {
      flex: 1,
    };
  }, []);

  const { data, loading } = useFetchJson<IAccount>(
    "https://www.ag-grid.com/example-assets/master-detail-data.json",
  );

  const onFirstDataRendered = useCallback((params: FirstDataRenderedEvent) => {
    params.api.forEachNode(function (node) {
      node.setExpanded(node.id === "1");
    });
  }, []);

  return (
    <AgGridProvider modules={modules}>
      <div style={containerStyle}>
        <div style={gridStyle}>
          <AgGridReact<IAccount>
            rowData={data}
            loading={loading}
            masterDetail={true}
            detailCellRenderer={detailCellRenderer}
            columnDefs={columnDefs}
            defaultColDef={defaultColDef}
            onFirstDataRendered={onFirstDataRendered}
          />
        </div>
      </div>
    </AgGridProvider>
  );
};

const root = createRoot(document.getElementById("root")!);
root.render(
  <StrictMode>
    <GridExample />
  </StrictMode>,
);
```

[Live example: Simple Detail Cell Renderer](https://www.ag-grid.com/archive/36.1.0/examples/master-detail-custom-detail/simple-custom-detail/reactFunctionalTs)

## Custom Detail With Form

It is not mandatory to display a grid inside the detail section. As you are providing a custom component, there are no restrictions as to what can appear inside the custom component.

This example shows a custom Detail Cell Renderer that uses a form rather than a grid.

#### Custom Detail Cell Renderer with Form

```tsx
"use client";

import React, {
  useCallback,
  useMemo,
  useRef,
  useState,
  StrictMode,
} from "react";
import { createRoot } from "react-dom/client";
import { AgGridReact, AgGridProvider } from "ag-grid-react";
import "./styles.css";
import {
  ClientSideRowModelModule,
  ColDef,
  ColGroupDef,
  FirstDataRenderedEvent,
  GridApi,
  GridOptions,
  ModuleRegistry,
  RowApiModule,
  enableDevValidations,
} from "ag-grid-community";
import {
  ColumnMenuModule,
  ColumnsToolPanelModule,
  ContextMenuModule,
  MasterDetailModule,
} from "ag-grid-enterprise";
import DetailCellRenderer from "./detailCellRenderer.tsx";
import { IAccount } from "./interfaces";
import { useFetchJson } from "./useFetchJson";

if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

const modules = [
  RowApiModule,
  ClientSideRowModelModule,
  ColumnsToolPanelModule,
  MasterDetailModule,
  ColumnMenuModule,
  ContextMenuModule,
];

const GridExample = () => {
  const containerStyle = useMemo(() => ({ width: "100%", height: "100%" }), []);
  const gridStyle = useMemo(() => ({ height: "100%", width: "100%" }), []);

  const [columnDefs, setColumnDefs] = useState<ColDef[]>([
    // group cell renderer needed for expand / collapse icons
    { field: "name", cellRenderer: "agGroupCellRenderer" },
    { field: "account" },
    { field: "calls" },
    { field: "minutes", valueFormatter: "x.toLocaleString() + 'm'" },
  ]);
  const defaultColDef = useMemo<ColDef>(() => {
    return {
      flex: 1,
    };
  }, []);
  const detailCellRenderer = useCallback(DetailCellRenderer, []);

  const { data, loading } = useFetchJson<IAccount>(
    "https://www.ag-grid.com/example-assets/master-detail-data.json",
  );

  const onFirstDataRendered = useCallback((params: FirstDataRenderedEvent) => {
    params.api.forEachNode(function (node) {
      node.setExpanded(node.id === "1");
    });
  }, []);

  return (
    <AgGridProvider modules={modules}>
      <div style={containerStyle}>
        <div style={gridStyle}>
          <AgGridReact<IAccount>
            rowData={data}
            loading={loading}
            columnDefs={columnDefs}
            defaultColDef={defaultColDef}
            masterDetail={true}
            detailCellRenderer={detailCellRenderer}
            detailRowHeight={80}
            groupDefaultExpanded={1}
            onFirstDataRendered={onFirstDataRendered}
          />
        </div>
      </div>
    </AgGridProvider>
  );
};

const root = createRoot(document.getElementById("root")!);
root.render(
  <StrictMode>
    <GridExample />
  </StrictMode>,
);
```

[Live example: Custom Detail Cell Renderer with Form](https://www.ag-grid.com/archive/36.1.0/examples/master-detail-custom-detail/custom-detail-with-form/reactFunctionalTs)

## Custom Detail With Grid

It is possible to provide a Custom Detail Grid that does a similar job to the default Detail Cell Renderer. This example demonstrates displaying a custom grid as the detail. Details are logged to the developer console.

#### Custom Detail Cell Renderer with Grid

```tsx
("use client");

import React, {
  useCallback,
  useMemo,
  useRef,
  useState,
  StrictMode,
} from "react";
import { createRoot } from "react-dom/client";
import { AgGridReact, AgGridProvider } from "ag-grid-react";
import "./styles.css";
import {
  ClientSideRowModelApiModule,
  ClientSideRowModelModule,
  ColDef,
  ColGroupDef,
  FirstDataRenderedEvent,
  GridApi,
  GridOptions,
  ModuleRegistry,
  RowApiModule,
  enableDevValidations,
} from "ag-grid-community";
import {
  ColumnMenuModule,
  ColumnsToolPanelModule,
  ContextMenuModule,
  MasterDetailModule,
} from "ag-grid-enterprise";
import DetailCellRenderer from "./detailCellRenderer.tsx";
import { IAccount } from "./interfaces";
import { useFetchJson } from "./useFetchJson";

if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

const modules = [
  ClientSideRowModelApiModule,
  RowApiModule,
  ClientSideRowModelModule,
  ColumnsToolPanelModule,
  MasterDetailModule,
  ColumnMenuModule,
  ContextMenuModule,
];

declare let window: any;

const GridExample = () => {
  const gridRef = useRef<AgGridReact<IAccount>>(null);
  const containerStyle = useMemo(() => ({ width: "100%", height: "100%" }), []);
  const gridStyle = useMemo(() => ({ height: "100%", width: "100%" }), []);

  const [columnDefs, setColumnDefs] = useState<ColDef[]>([
    // group cell renderer needed for expand / collapse icons
    { field: "name", cellRenderer: "agGroupCellRenderer" },
    { field: "account" },
    { field: "calls" },
    { field: "minutes", valueFormatter: "x.toLocaleString() + 'm'" },
  ]);
  const defaultColDef = useMemo<ColDef>(() => {
    return {
      flex: 1,
    };
  }, []);
  const detailCellRenderer = useCallback(DetailCellRenderer, []);

  const { data, loading } = useFetchJson<IAccount>(
    "https://www.ag-grid.com/example-assets/master-detail-data.json",
  );

  const onFirstDataRendered = useCallback((params: FirstDataRenderedEvent) => {
    // arbitrarily expand a row for presentational purposes
    setTimeout(() => {
      params.api.getDisplayedRowAtIndex(1)!.setExpanded(true);
    }, 0);
  }, []);

  const expandCollapseAll = useCallback(() => {
    gridRef.current!.api.forEachNode(function (node) {
      node.expanded = !!window.collapsed;
    });
    window.collapsed = !window.collapsed;
    gridRef.current!.api.onGroupExpandedOrCollapsed();
  }, [window]);

  const printDetailGridInfo = useCallback(() => {
    console.log("Currently registered detail grid's: ");
    gridRef.current!.api.forEachDetailGridInfo(function (detailGridInfo) {
      console.log(detailGridInfo);
    });
  }, []);

  return (
    <AgGridProvider modules={modules}>
      <div style={containerStyle}>
        <div className="example-wrapper">
          <div style={{ marginBottom: "5px" }}>
            <button onClick={printDetailGridInfo}>
              Print Detail Grid Info
            </button>
            <button onClick={expandCollapseAll}>
              Toggle Expand / Collapse
            </button>
          </div>

          <div style={gridStyle}>
            <AgGridReact<IAccount>
              ref={gridRef}
              rowData={data}
              loading={loading}
              columnDefs={columnDefs}
              defaultColDef={defaultColDef}
              masterDetail={true}
              detailRowHeight={310}
              detailCellRenderer={detailCellRenderer}
              onFirstDataRendered={onFirstDataRendered}
            />
          </div>
        </div>
      </div>
    </AgGridProvider>
  );
};

const root = createRoot(document.getElementById("root")!);
root.render(
  <StrictMode>
    <GridExample />
  </StrictMode>,
);
```

[Live example: Custom Detail Cell Renderer with Grid](https://www.ag-grid.com/archive/36.1.0/examples/master-detail-custom-detail/custom-detail-with-grid/reactFunctionalTs)

## Register Detail Grid

In order for the Detail Grid's API to be available via the Master Grid as explained in [Accessing Detail Grids](https://www.ag-grid.com/archive/36.1.0/react-data-grid/master-detail-grids/#accessing-detail-grids), a Grid Info object needs to be registered with the Master Grid.

| Property | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `addDetailGridInfo` | `Function` |  |  | Register a detail grid with the master grid when it is created. Module: [`MasterDetailModule`](https://www.ag-grid.com/archive/36.1.0/react-data-grid/modules/). |
| `removeDetailGridInfo` | `Function` |  |  | Unregister a detail grid from the master grid when it is destroyed. Module: [`MasterDetailModule`](https://www.ag-grid.com/archive/36.1.0/react-data-grid/modules/). |

When the Detail Grid is created, register it via `masterGridApi.addDetailGridInfo(id, info)` and when the Detail Grid is destroyed, unregister it via `masterGridApi.removeDetailGridInfo(id)`. A Detail ID is required when calling these methods. Any unique ID can be used, however for consistency with how the default Detail Cell Renderer works it's recommended to use the ID of the detail Row Node.

```js
//////////////////////////////
// Register with Master Grid
const detailId = params.node.id;

// Create Grid Info object
const detailGridInfo = {
    id: detailId,
    api: params.api,
};

this.masterGridApi.addDetailGridInfo(detailId, detailGridInfo);

//////////////////////////////
// Unregister with Master Grid
this.masterGridApi.removeDetailGridInfo(detailId);
```

## Custom Detail Height

When using a custom Detail Cell Renderer the height of the detail section can be customised as explained in [Detail Height](https://www.ag-grid.com/archive/36.1.0/react-data-grid/master-detail-height/).

## Refreshing

When data is updated in the grid using [Transaction Updates](https://www.ag-grid.com/archive/36.1.0/react-data-grid/data-update-transactions/), Detail Cell Renderers will be refreshed with updated props. This is demonstrated in the below example.

#### Custom Detail with Refresh

```tsx
'use client';
import React, { StrictMode, useCallback, useMemo, useState } from "react";
import { createRoot } from "react-dom/client";

import type {
  ColDef,
  FirstDataRenderedEvent,
  GridReadyEvent,
} from "ag-grid-community";
import {
  ClientSideRowModelApiModule,
  ClientSideRowModelModule,
  HighlightChangesModule,
  enableDevValidations,
} from "ag-grid-community";
import {
  ColumnMenuModule,
  ColumnsToolPanelModule,
  ContextMenuModule,
  MasterDetailModule,
} from "ag-grid-enterprise";
import { AgGridProvider, AgGridReact } from "ag-grid-react";

import DetailCellRenderer from "./detailCellRenderer";
import type { IAccount } from "./interfaces";
import "./styles.css";

// Enable extended validations only for development
if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

const modules = [
  ClientSideRowModelApiModule,
  HighlightChangesModule,
  ClientSideRowModelModule,
  MasterDetailModule,
  ColumnMenuModule,
  ContextMenuModule,
  ColumnsToolPanelModule,
];

let allRowData: any[];

const GridExample = () => {
  const containerStyle = useMemo(() => ({ width: "100%", height: "100%" }), []);
  const gridStyle = useMemo(() => ({ height: "100%", width: "100%" }), []);
  const [rowData, setRowData] = useState<IAccount[]>();
  const [columnDefs, setColumnDefs] = useState<ColDef[]>([
    // group cell renderer needed for expand / collapse icons
    { field: "name", cellRenderer: "agGroupCellRenderer" },
    { field: "account" },
    { field: "calls" },
    { field: "minutes", valueFormatter: "x.toLocaleString() + 'm'" },
  ]);
  const defaultColDef = useMemo<ColDef>(() => {
    return {
      flex: 1,
      enableCellChangeFlash: true,
    };
  }, []);
  const detailCellRenderer = useMemo(() => {
    return DetailCellRenderer;
  }, []);

  const onGridReady = useCallback((params: GridReadyEvent) => {
    fetch("https://www.ag-grid.com/example-assets/master-detail-data.json")
      .then((resp) => resp.json())
      .then((data: IAccount[]) => {
        allRowData = data;
        setRowData(allRowData);
      });
  }, []);

  const onFirstDataRendered = useCallback(
    (params: FirstDataRenderedEvent) => {
      setInterval(() => {
        if (!allRowData) {
          return;
        }
        const data = allRowData[0];
        const newCallRecords: any[] = [];
        data.callRecords.forEach((record: any, index: number) => {
          newCallRecords.push({
            name: record.name,
            callId: record.callId,
            duration: record.duration + (index % 2),
            switchCode: record.switchCode,
            direction: record.direction,
            number: record.number,
          });
        });
        data.callRecords = newCallRecords;
        data.calls++;
        const tran = {
          update: [data],
        };
        params.api.applyTransaction(tran);
      }, 2000);
    },
    [allRowData],
  );

  return (
    <AgGridProvider modules={modules}>
      <div style={containerStyle}>
        <div style={gridStyle}>
          <AgGridReact<IAccount>
            rowData={rowData}
            columnDefs={columnDefs}
            defaultColDef={defaultColDef}
            masterDetail={true}
            detailCellRenderer={detailCellRenderer}
            detailRowHeight={70}
            groupDefaultExpanded={1}
            onGridReady={onGridReady}
            onFirstDataRendered={onFirstDataRendered}
          />
        </div>
      </div>
    </AgGridProvider>
  );
};

const root = createRoot(document.getElementById("root")!);
root.render(
  <StrictMode>
    <GridExample />
  </StrictMode>,
);
```

[Live example: Custom Detail with Refresh](https://www.ag-grid.com/archive/36.1.0/examples/master-detail-custom-detail/custom-detail-with-refresh/reactFunctionalTs)

## Keyboard Navigation

To add keyboard navigation to custom detail panels, it must be implemented in the custom Detail Cell Renderer. There are several parts to this:

1. Create a listener function for the `focus` event when the custom detail panel receives focus. Within this function, the event object `target` value is the custom detail row element, and event object `relatedTarget` value is the previous element that was previously focused on. You will need to find the parent of the `relatedTarget` with `role=row` attribute to get the previous row element. With the current row element and the previous row element, checking the `row-index` attribute allows you to see if the user is entering the focus from the previous or current row (ie, `row-index` increases or is the same from previous to current) or the next row (ie, `row-index` decreases from previous to current). With this knowledge, you can set focus using `element.focus()` on the relevant element in your custom detail panel
2. Attach the above function to a `focus` listener on the `eParentOfValue` param value in the component initialisation
3. Remove the above function from the `focus` listener in the component destroy or unmount method

The following example shows an implementation of keyboard navigation in a custom detail panel:

- Click a cell in the `Mila Smith` master row and press `⇥ Tab` key to move focus to the custom detail panel inputs of the `Mila Smith` master row.
- Click a cell in the `Evelyn Taylor` master row and press `⇧ Shift`+`⇥ Tab` to focus the inputs in the custom detail panel of the `Mila Smith` master row.

> **Note**
>
> This example is illustrative of the main concepts, but the actual implementation of custom keyboard navigation will vary based on the specific custom detail panel.

#### Custom Detail Cell Renderer Keyboard Navigation

```tsx
"use client";

import React, {
  useCallback,
  useMemo,
  useRef,
  useState,
  StrictMode,
} from "react";
import { createRoot } from "react-dom/client";
import { AgGridReact, AgGridProvider } from "ag-grid-react";
import "./styles.css";
import {
  ClientSideRowModelModule,
  ColDef,
  ColGroupDef,
  FirstDataRenderedEvent,
  GridApi,
  GridOptions,
  ModuleRegistry,
  RowApiModule,
  enableDevValidations,
} from "ag-grid-community";
import {
  ColumnMenuModule,
  ColumnsToolPanelModule,
  ContextMenuModule,
  MasterDetailModule,
} from "ag-grid-enterprise";
import DetailCellRenderer from "./detailCellRenderer.tsx";
import { IAccount } from "./interfaces";
import { useFetchJson } from "./useFetchJson";

if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

const modules = [
  RowApiModule,
  ClientSideRowModelModule,
  ColumnsToolPanelModule,
  MasterDetailModule,
  ColumnMenuModule,
  ContextMenuModule,
];

const GridExample = () => {
  const containerStyle = useMemo(() => ({ width: "100%", height: "100%" }), []);
  const gridStyle = useMemo(() => ({ height: "100%", width: "100%" }), []);

  const [columnDefs, setColumnDefs] = useState<ColDef[]>([
    // group cell renderer needed for expand / collapse icons
    { field: "name", cellRenderer: "agGroupCellRenderer" },
    { field: "account" },
    { field: "calls" },
    { field: "minutes", valueFormatter: "x.toLocaleString() + 'm'" },
  ]);
  const defaultColDef = useMemo<ColDef>(() => {
    return {
      flex: 1,
    };
  }, []);
  const detailCellRenderer = useCallback(DetailCellRenderer, []);

  const { data, loading } = useFetchJson<IAccount>(
    "https://www.ag-grid.com/example-assets/master-detail-data.json",
  );

  const onFirstDataRendered = useCallback((params: FirstDataRenderedEvent) => {
    params.api.forEachNode(function (node) {
      node.setExpanded(node.id === "1");
    });
  }, []);

  return (
    <AgGridProvider modules={modules}>
      <div style={containerStyle}>
        <div style={gridStyle}>
          <AgGridReact<IAccount>
            rowData={data}
            loading={loading}
            columnDefs={columnDefs}
            defaultColDef={defaultColDef}
            masterDetail={true}
            detailCellRenderer={detailCellRenderer}
            detailRowHeight={70}
            onFirstDataRendered={onFirstDataRendered}
          />
        </div>
      </div>
    </AgGridProvider>
  );
};

const root = createRoot(document.getElementById("root")!);
root.render(
  <StrictMode>
    <GridExample />
  </StrictMode>,
);
```

[Live example: Custom Detail Cell Renderer Keyboard Navigation](https://www.ag-grid.com/archive/36.1.0/examples/master-detail-custom-detail/custom-detail-keyboard-navigation/reactFunctionalTs)