---
title: "Loading Component"
framework: angular
version: "36.1.0"
---

# Loading Component

The Loading Component is displayed for a row to show data is loading.

## Full Width Loading Row

The example below demonstrates replacing the Provided Loading Component with a Custom Loading Component.

- **Custom Loading Component** is supplied by name via `gridOptions.loadingCellRenderer`.
- **Custom Loading Component Parameters** are supplied using `gridOptions.loadingCellRendererParams`.
- Example simulates a long delay to display the spinner clearly.
- Scrolling the grid will request more rows and again display the loading cell renderer.

#### Custom Loading Cell Renderer

```ts
import { Component } from "@angular/core";
import { HttpClient } from "@angular/common/http";
import { AgGridAngular } from "ag-grid-angular";
import {
  ColDef,
  ColGroupDef,
  GridApi,
  GridOptions,
  GridReadyEvent,
  IServerSideDatasource,
  IServerSideGetRowsRequest,
  ModuleRegistry,
  NumberEditorModule,
  NumberFilterModule,
  RowModelType,
  TextEditorModule,
  TextFilterModule,
  enableDevValidations,
} from "ag-grid-community";
import { ServerSideRowModelModule } from "ag-grid-enterprise";
if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

ModuleRegistry.registerModules([
  NumberEditorModule,
  TextEditorModule,
  TextFilterModule,
  NumberFilterModule,
  ServerSideRowModelModule,
]);
import { CustomLoadingCellRenderer } from "./custom-loading-cell-renderer.component";
import { IOlympicData } from "./interfaces";

@Component({
  selector: "my-app",
  standalone: true,
  imports: [AgGridAngular, CustomLoadingCellRenderer],
  template: `<div
    style="height: 100%; padding-top: 25px; box-sizing: border-box"
  >
    <ag-grid-angular
      style="width: 100%; height: 100%;"
      [columnDefs]="columnDefs"
      [defaultColDef]="defaultColDef"
      [loadingCellRenderer]="loadingCellRenderer"
      [loadingCellRendererParams]="loadingCellRendererParams"
      [rowModelType]="rowModelType"
      [cacheBlockSize]="cacheBlockSize"
      [maxBlocksInCache]="maxBlocksInCache"
      [rowData]="rowData"
      (gridReady)="onGridReady($event)"
    />
  </div> `,
})
export class AppComponent {
  columnDefs: ColDef[] = [
    { field: "id" },
    { field: "athlete", width: 150 },
    { field: "age" },
    { field: "country" },
    { field: "year" },
    { field: "sport" },
    { field: "gold" },
    { field: "silver" },
    { field: "bronze" },
  ];
  defaultColDef: ColDef = {
    editable: true,
    flex: 1,
    minWidth: 100,
    filter: true,
  };
  loadingCellRenderer: any = CustomLoadingCellRenderer;
  loadingCellRendererParams: any = {
    loadingMessage: "One moment please...",
  };
  rowModelType: RowModelType = "serverSide";
  cacheBlockSize = 20;
  maxBlocksInCache = 10;
  rowData!: IOlympicData[];

  constructor(private http: HttpClient) {}

  onGridReady(params: GridReadyEvent<IOlympicData>) {
    this.http
      .get<
        IOlympicData[]
      >("https://www.ag-grid.com/example-assets/olympic-winners.json")
      .subscribe((data) => {
        // add id to data
        let idSequence = 0;
        data.forEach((item: any) => {
          item.id = idSequence++;
        });
        const server: any = getFakeServer(data);
        const datasource: IServerSideDatasource =
          getServerSideDatasource(server);
        params.api!.setGridOption("serverSideDatasource", datasource);
      });
  }
}

function getServerSideDatasource(server: any): IServerSideDatasource {
  return {
    getRows: (params) => {
      // adding delay to simulate real server call
      setTimeout(() => {
        const response = server.getResponse(params.request);
        if (response.success) {
          // call the success callback
          params.success({
            rowData: response.rows,
            rowCount: response.lastRow,
          });
        } else {
          // inform the grid request failed
          params.fail();
        }
      }, 4000);
    },
  };
}
function getFakeServer(allData: any[]): any {
  return {
    getResponse: (request: IServerSideGetRowsRequest) => {
      console.log(
        "asking for rows: " + request.startRow + " to " + request.endRow,
      );
      // take a slice of the total rows
      const rowsThisPage = allData.slice(request.startRow, request.endRow);
      // if on or after the last page, work out the last row.
      const lastRow =
        allData.length <= (request.endRow || 0) ? allData.length : -1;
      return {
        success: true,
        rows: rowsThisPage,
        lastRow: lastRow,
      };
    },
  };
}
```

[Live example: Custom Loading Cell Renderer](https://www.ag-grid.com/examples/component-loading-cell-renderer/custom-loading-cell-renderer/angular/)

### Custom Loading Row

The interface for the loading cell renderer component is as follows:

```ts
interface ILoadingCellRendererAngularComp {

    // Mandatory - The agInit(params) method is called on the loading cell renderer once.
    agInit(params: ILoadingCellRendererParams): void;
}
```

The `agInit(params)` method takes a params object with the items listed below:

Properties available on the `ILoadingCellRendererParams&lt;TData = any, TValue = any, TContext = any&gt;` interface.

| Property | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `node` | [`IRowNode`](https://www.ag-grid.com/angular-data-grid/row-object/) |  |  | The row node. |
| `api` | [`GridApi`](https://www.ag-grid.com/angular-data-grid/grid-api/) |  |  | The grid api. |
| `context` | [`TContext`](https://www.ag-grid.com/angular-data-grid/typescript-generics/#context-tcontext) |  |  | Application context as set on `gridOptions.context`. |

### Failed Loading

When using a Custom Loading Component, you can add handling for loading failures in the component directly.

In the example below, note that:

- **Custom Loading Component** is supplied by name via `gridOptions.loadingCellRenderer`.
- **Custom Loading Component Parameters** are supplied using `gridOptions.loadingCellRendererParams`.
- The example simulates a long delay to display the spinner clearly and simulates a loading failure.

#### Custom Loading Cell Renderer Failed

```ts
import { Component } from "@angular/core";
import { HttpClient } from "@angular/common/http";
import { AgGridAngular } from "ag-grid-angular";
import {
  ColDef,
  ColGroupDef,
  GridApi,
  GridOptions,
  GridReadyEvent,
  IServerSideDatasource,
  IServerSideGetRowsRequest,
  ModuleRegistry,
  NumberEditorModule,
  NumberFilterModule,
  RowModelType,
  TextEditorModule,
  TextFilterModule,
  enableDevValidations,
} from "ag-grid-community";
import { ServerSideRowModelModule } from "ag-grid-enterprise";
if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

ModuleRegistry.registerModules([
  NumberEditorModule,
  TextEditorModule,
  TextFilterModule,
  NumberFilterModule,
  ServerSideRowModelModule,
]);
import { CustomLoadingCellRenderer } from "./custom-loading-cell-renderer.component";
import { IOlympicData } from "./interfaces";

@Component({
  selector: "my-app",
  standalone: true,
  imports: [AgGridAngular, CustomLoadingCellRenderer],
  template: `<div
    style="height: 100%; padding-top: 25px; box-sizing: border-box"
  >
    <ag-grid-angular
      style="width: 100%; height: 100%;"
      [columnDefs]="columnDefs"
      [defaultColDef]="defaultColDef"
      [loadingCellRenderer]="loadingCellRenderer"
      [loadingCellRendererParams]="loadingCellRendererParams"
      [rowModelType]="rowModelType"
      [cacheBlockSize]="cacheBlockSize"
      [serverSideInitialRowCount]="serverSideInitialRowCount"
      [rowData]="rowData"
      (gridReady)="onGridReady($event)"
    />
  </div> `,
})
export class AppComponent {
  columnDefs: ColDef[] = [
    { field: "id" },
    { field: "athlete", width: 150 },
    { field: "age" },
    { field: "country" },
    { field: "year" },
    { field: "sport" },
    { field: "gold" },
    { field: "silver" },
    { field: "bronze" },
  ];
  defaultColDef: ColDef = {
    editable: true,
    flex: 1,
    minWidth: 100,
    filter: true,
  };
  loadingCellRenderer: any = CustomLoadingCellRenderer;
  loadingCellRendererParams: any = {
    loadingMessage: "One moment please...",
  };
  rowModelType: RowModelType = "serverSide";
  cacheBlockSize = 10;
  serverSideInitialRowCount = 10;
  rowData!: IOlympicData[];

  constructor(private http: HttpClient) {}

  onGridReady(params: GridReadyEvent<IOlympicData>) {
    this.http
      .get<
        IOlympicData[]
      >("https://www.ag-grid.com/example-assets/olympic-winners.json")
      .subscribe((data) => {
        // add id to data
        let idSequence = 0;
        data.forEach((item: any) => {
          item.id = idSequence++;
        });
        const server: any = getFakeServer(data);
        const datasource: IServerSideDatasource =
          getServerSideDatasource(server);
        params.api!.setGridOption("serverSideDatasource", datasource);
      });
  }
}

function getServerSideDatasource(server: any): IServerSideDatasource {
  return {
    getRows: (params) => {
      // adding delay to simulate real server call
      setTimeout(() => {
        // Fail loading to display failed loading cell renderer
        params.fail();
      }, 4000);
    },
  };
}
function getFakeServer(allData: any[]): any {
  return {
    getResponse: (request: IServerSideGetRowsRequest) => {
      console.log(
        "asking for rows: " + request.startRow + " to " + request.endRow,
      );
      // take a slice of the total rows
      const rowsThisPage = allData.slice(request.startRow, request.endRow);
      // if on or after the last page, work out the last row.
      const lastRow =
        allData.length <= (request.endRow || 0) ? allData.length : -1;
      return {
        success: true,
        rows: rowsThisPage,
        lastRow: lastRow,
      };
    },
  };
}
```

[Live example: Custom Loading Cell Renderer Failed](https://www.ag-grid.com/examples/component-loading-cell-renderer/custom-loading-cell-renderer-failed/angular/)

### Dynamic Loading Row Selection

It's possible to determine what Loading Cell Renderer to use dynamically - i.e. at runtime. This requires providing a `loadingCellRendererSelector`.

```ts
loadingCellRendererSelector: (params) => {
    const useCustomRenderer = ...some condition/check...
    if (useCustomRenderer) {
        return {
            component: CustomLoadingCellRenderer,
            params: {
                // parameters to supply to the custom loading cell renderer
                loadingMessage: '--- CUSTOM LOADING MESSAGE ---',
            },
        };
        } else {
            // no loading cell renderer
            return undefined;
        }
    }
}
```

## Skeleton Loading

The grid can be configured to instead display loading indicators in cells, by enabling `suppressServerSideFullWidthLoadingRow`.

#### Skeleton Loading Cell Renderer

```ts
import { Component } from "@angular/core";
import { HttpClient } from "@angular/common/http";
import { AgGridAngular } from "ag-grid-angular";
import {
  ColDef,
  ColGroupDef,
  GridApi,
  GridOptions,
  GridReadyEvent,
  IServerSideDatasource,
  IServerSideGetRowsRequest,
  ModuleRegistry,
  RowModelType,
  enableDevValidations,
} from "ag-grid-community";
import {
  RowGroupingModule,
  ServerSideRowModelModule,
} from "ag-grid-enterprise";
if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

ModuleRegistry.registerModules([ServerSideRowModelModule, RowGroupingModule]);
import { IOlympicData } from "./interfaces";

@Component({
  selector: "my-app",
  standalone: true,
  imports: [AgGridAngular],
  template: `<ag-grid-angular
    style="width: 100%; height: 100%;"
    [columnDefs]="columnDefs"
    [defaultColDef]="defaultColDef"
    [rowModelType]="rowModelType"
    [suppressServerSideFullWidthLoadingRow]="true"
    [cacheBlockSize]="cacheBlockSize"
    [maxBlocksInCache]="maxBlocksInCache"
    [rowBuffer]="rowBuffer"
    [maxConcurrentDatasourceRequests]="maxConcurrentDatasourceRequests"
    [blockLoadDebounceMillis]="blockLoadDebounceMillis"
    [rowData]="rowData"
    (gridReady)="onGridReady($event)"
  /> `,
})
export class AppComponent {
  columnDefs: ColDef[] = [
    { field: "country", flex: 4 },
    { field: "sport", flex: 4 },
    { field: "year", flex: 3 },
    { field: "gold", aggFunc: "sum", flex: 2 },
    { field: "silver", aggFunc: "sum", flex: 2 },
    { field: "bronze", aggFunc: "sum", flex: 2 },
  ];
  defaultColDef: ColDef = {
    minWidth: 75,
  };
  rowModelType: RowModelType = "serverSide";
  cacheBlockSize = 5;
  maxBlocksInCache = 0;
  rowBuffer = 0;
  maxConcurrentDatasourceRequests = 1;
  blockLoadDebounceMillis = 200;
  rowData!: IOlympicData[];

  constructor(private http: HttpClient) {}

  onGridReady(params: GridReadyEvent<IOlympicData>) {
    this.http
      .get<
        IOlympicData[]
      >("https://www.ag-grid.com/example-assets/olympic-winners.json")
      .subscribe((data) => {
        // add id to data
        let idSequence = 0;
        data.forEach((item: any) => {
          item.id = idSequence++;
        });
        const server: any = getFakeServer(data);
        const datasource: IServerSideDatasource =
          getServerSideDatasource(server);
        params.api!.setGridOption("serverSideDatasource", datasource);
      });
  }
}

function getServerSideDatasource(server: any): IServerSideDatasource {
  return {
    getRows: (params) => {
      // adding delay to simulate real server call
      setTimeout(() => {
        const response = server.getResponse(params.request);
        if (response.success) {
          // call the success callback
          params.success({
            rowData: response.rows,
            rowCount: response.lastRow,
          });
        } else {
          // inform the grid request failed
          params.fail();
        }
      }, 4000);
    },
  };
}
function getFakeServer(allData: any[]): any {
  return {
    getResponse: (request: IServerSideGetRowsRequest) => {
      console.log(
        "[Datasource] asking for rows: " +
          request.startRow +
          " to " +
          request.endRow,
      );
      // take a slice of the total rows
      const rowsThisPage = allData.slice(request.startRow, request.endRow);
      const lastRow = allData.length;
      return {
        success: true,
        rows: rowsThisPage,
        lastRow: lastRow,
      };
    },
  };
}
```

[Live example: Skeleton Loading Cell Renderer](https://www.ag-grid.com/examples/component-loading-cell-renderer/skeleton-loading-cell-renderer/angular/)

```
const gridOptions = {
    suppressServerSideFullWidthLoadingRow: true,
};
```

### Custom Loading Cells

The default grid behaviour can be overridden in order to provide renderers on a per-column basis.

#### Custom Cell Loading Renderer

```ts
import { Component } from "@angular/core";
import { HttpClient } from "@angular/common/http";
import { AgGridAngular } from "ag-grid-angular";
import {
  ColDef,
  ColGroupDef,
  GridApi,
  GridOptions,
  GridReadyEvent,
  IServerSideDatasource,
  IServerSideGetRowsRequest,
  ModuleRegistry,
  RowModelType,
  enableDevValidations,
} from "ag-grid-community";
import {
  RowGroupingModule,
  ServerSideRowModelModule,
} from "ag-grid-enterprise";
if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

ModuleRegistry.registerModules([ServerSideRowModelModule, RowGroupingModule]);
import { CustomLoadingCellRenderer } from "./custom-loading-cell-renderer.component";
import { IOlympicData } from "./interfaces";

@Component({
  selector: "my-app",
  standalone: true,
  imports: [AgGridAngular, CustomLoadingCellRenderer],
  template: `<ag-grid-angular
    style="width: 100%; height: 100%;"
    [columnDefs]="columnDefs"
    [defaultColDef]="defaultColDef"
    [rowModelType]="rowModelType"
    [cacheBlockSize]="cacheBlockSize"
    [maxBlocksInCache]="maxBlocksInCache"
    [rowBuffer]="rowBuffer"
    [maxConcurrentDatasourceRequests]="maxConcurrentDatasourceRequests"
    [blockLoadDebounceMillis]="blockLoadDebounceMillis"
    [suppressServerSideFullWidthLoadingRow]="true"
    [rowData]="rowData"
    (gridReady)="onGridReady($event)"
  /> `,
})
export class AppComponent {
  columnDefs: ColDef[] = [
    {
      field: "country",
      flex: 4,
      loadingCellRenderer: CustomLoadingCellRenderer,
    },
    { field: "sport", flex: 4 },
    { field: "year", flex: 3 },
    { field: "gold", aggFunc: "sum", flex: 2 },
    { field: "silver", aggFunc: "sum", flex: 2 },
    { field: "bronze", aggFunc: "sum", flex: 2 },
  ];
  defaultColDef: ColDef = {
    loadingCellRenderer: () => "",
    minWidth: 75,
  };
  rowModelType: RowModelType = "serverSide";
  cacheBlockSize = 5;
  maxBlocksInCache = 0;
  rowBuffer = 0;
  maxConcurrentDatasourceRequests = 1;
  blockLoadDebounceMillis = 200;
  rowData!: IOlympicData[];

  constructor(private http: HttpClient) {}

  onGridReady(params: GridReadyEvent<IOlympicData>) {
    this.http
      .get<
        IOlympicData[]
      >("https://www.ag-grid.com/example-assets/olympic-winners.json")
      .subscribe((data) => {
        // add id to data
        let idSequence = 0;
        data.forEach((item: any) => {
          item.id = idSequence++;
        });
        const server: any = getFakeServer(data);
        const datasource: IServerSideDatasource =
          getServerSideDatasource(server);
        params.api!.setGridOption("serverSideDatasource", datasource);
      });
  }
}

function getServerSideDatasource(server: any): IServerSideDatasource {
  return {
    getRows: (params) => {
      // adding delay to simulate real server call
      setTimeout(() => {
        const response = server.getResponse(params.request);
        if (response.success) {
          // call the success callback
          params.success({
            rowData: response.rows,
            rowCount: response.lastRow,
          });
        } else {
          // inform the grid request failed
          params.fail();
        }
      }, 1000);
    },
  };
}
function getFakeServer(allData: any[]): any {
  return {
    getResponse: (request: IServerSideGetRowsRequest) => {
      console.log(
        "asking for rows: " + request.startRow + " to " + request.endRow,
      );
      // take a slice of the total rows
      const rowsThisPage = allData.slice(request.startRow, request.endRow);
      const lastRow = allData.length;
      return {
        success: true,
        rows: rowsThisPage,
        lastRow: lastRow,
      };
    },
  };
}
```

[Live example: Custom Cell Loading Renderer](https://www.ag-grid.com/examples/component-loading-cell-renderer/custom-cell-loading-renderer/angular/)

```
const gridOptions = {
    suppressServerSideFullWidthLoadingRow: true,
    columnDefs: [
        { field: 'athlete', loadingCellRenderer: CustomLoadingCellRenderer },
        // More columns, with no load renderer...
    ],
    defaultColDef: {
        loadingCellRenderer: () => '',
    },
};
```

The above example demonstrates the following:

- `suppressServerSideFullWidthLoadingRow` is enabled, preventing the grid from defaulting to full width loading.
- `loadingCellRenderer` is configured on the *Athlete* column, allowing a loading spinner to be displayed for just this column.
- `loadingCellRenderer` is configured on the `defaultColDef` providing an empty cell renderer in order to prevent the default grid loading renderer from displaying on other columns.