Angular Data GridCustom 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.

<ag-grid-angular
    [detailCellRenderer]="detailCellRenderer"
    [detailCellRendererParams]="detailCellRendererParams"
    /* other grid options ... */ />

// normally left blank, the grid will use the default Detail Cell Renderer
this.detailCellRenderer = 'myCellRendererComp';

// params sent to the Detail Cell Renderer, in this case your MyCellRendererComp
this.detailCellRendererParams = {};

The Detail Cell Renderer should be a Cell Renderer component. See 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.

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 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.

Register Detail Grid

In order for the Detail Grid's API to be available via the Master Grid as explained in Accessing Detail Grids, a Grid Info object needs to be registered with the Master Grid.

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.

//////////////////////////////
// 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);

Refreshing

When data is updated in the grid using Transaction Updates, the grid will call refresh on all Detail Cell Renderers.

It is up to the Detail Cell Renderer whether it wants to act on the refresh or not. If the refresh() method returns true, the grid will assume the Detail Cell Renderer has refreshed successfully and nothing more will happen. However if false is returned, the grid will destroy the Detail Cell Renderer and re-create it again.

This pattern is similar to how refresh works for normal grid Cell Renderers.

The example below shows how components can refresh on updates. The example refreshes the first row every one second. The refresh() method gets called on the corresponding Detail Cell Renderer after the transaction is applied. The Detail Cell Renderer refresh method reads the latest call count from the params, and the last updated time is also changed.

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.