TreeTable

Imports

You have to import the DtTreeTableModule when you want to use the <dt-tree-table>:

@NgModule({
  imports: [
    DtTreeTableModule,
  ],
})
class MyModule {}

Description

The <dt-tree-table> provides the functionality of a tree displayed in a grid/table. The api is very similar to the <dt-table> component. You define the different columns and rows and choose which columns should be rendered inside each row. It is also possible to have multiple different row templates that can be switched when a row should have a special behavior e.g. a show more row for lazily loading more rows.

Usage

Start by adding the <dt-tree-table> component to your template and provide it with a datasource and a treecontrol.

<dt-tree-table [dataSource]="dataSource" [treeControl]="treeControl">
</dt-tree-table>

Provide the data

Since a table is a flat structure but we want to show hierachical tree data there is a special datasource called DtTreeDataSource involved. The DtTreeControl is responsible for controlling expanding/collapsing of nodes.

private _getLevel = (node: ThreadFlatNode) => node.level;

private _isExpandable = (node: ThreadFlatNode) => node.expandable;

this.treeControl = new DtTreeControl<ThreadFlatNode>(this._getLevel, this._isExpandable);

The DtTreeFlattener takes multiple accessor functions as parameters to transform the hierachical data to a flat datastructure that can be rendered inside the table. The DtTreeFlattener is a generic class that transforms a hierachical structure of nodes of type T to a flat structure of nodes of type F; In the example below it takes the hierachical type ThreadNode and transforms it to ThreadFlatNode.

private _transformer = (node: ThreadNode, level: number): ThreadFlatNode => {
  ...
  return flatNode;
}
private _getLevel = (node: ThreadFlatNode) => node.level;

private _isExpandable = (node: ThreadFlatNode) => node.expandable;

private _getChildren = (node: ThreadNode): ThreadNode[] => node.children || [];

this.treeFlattener =  new DtTreeFlattener<ThreadNode, ThreadFlatNode>(this._transformer, this._getLevel, this._isExpandable, this._getChildren);

The DtTreeDataSource gets the DtTreeFlattener and the DtTreeControl as parameters.

this.dataSource = new DtTreeDataSource(this.treeControl, this.treeFlattener);

By assigning the data property on the datasource with a new set of data the tree-table is populated with the rows.

this.dataSource.data = [
  {
    name: 'hz.hzInstance_1_cluster.thread',
    icon: 'apache-tomcat',
    threadlevel: 'S0',
    totalTimeConsumption: 150,
    waiting: 123,
    running: 20,
    blocked: 0,
    children: [
      {
        name: 'hz.hzInstance_1_cluster.thread_1_hz.hzInstance_1_cluster.thread-1',
        icon: 'apache-tomcat',
        threadlevel: 'S1',
        totalTimeConsumption: 150,
        waiting: 123,
        running: 20,
        blocked: 0,
      },
      {
        name: 'hz.hzInstance_1_cluster.thread-2',
        icon: 'apache-tomcat',
        threadlevel: 'S1',
        totalTimeConsumption: 150,
        waiting: 130,
        running: 0,
        blocked: 0,
      }
    ]
  },
]

Adding column templates

To specify the different columns that are shown inside the table you have to define column templates. Each column consists of <dt-tree-table-header-cell> and either a <dt-tree-table-toggle-cell> or a <dt-cell> inside a <ng-container>.

The first column shown in the <dt-tree-table> has to include the <dt-tree-table-toggle-cell>. This special cell includes the indentation logic and the toggle button used to expand/collapse the next level of rows.

 <ng-container dtColumnDef="name">
    <dt-tree-table-header-cell *dtHeaderCellDef>Name</dt-tree-table-header-cell>
    <dt-tree-table-toggle-cell *dtCellDef="let row">
      
    </dt-tree-table-toggle-cell>
  </ng-container>

A normal column could like the following example

 <ng-container dtColumnDef="waiting">
    <dt-tree-table-header-cell *dtHeaderCellDef>Waiting</dt-tree-table-header-cell>
    <dt-cell *dtCellDef="let row">
      
    </dt-cell>
  </ng-container>

After adding all column definitions the next step is to add the row definitions.

Adding the rows

You want to add the table header by adding a <dt-header-row> inside the <dt-tree-table> tag.

<dt-header-row *dtHeaderRowDef="['name', 'total', 'blocked', 'running', 'waiting', 'actions']"></dt-header-row>

The next step is to add the row where the columns get rendered. You can do this by adding the <dt-tree-table-row> inside the <dt-tree-table> tag. You can specify the columns that should be rendered and don't forget to bind the row's data to the <dt-tree-table-row>s data input [data]="row".

<dt-tree-table-row *dtRowDef="let row; columns: ['name', 'total', 'blocked', 'running', 'waiting', 'actions'];" [data]="row"></dt-tree-table-row>

Column alignment

If you want to specify an alignment for the content of a column you can do so by setting the dtColumnAlign input on the <ng-container dtColumnDef=... dtColumnAlign="text">

The dtColumnAlign input handles the following values: 'left' | 'right' | 'center' or one of the typed values that get mapped to left, right and center internally 'text' | 'id' | 'icon' | 'control' | 'number' | 'date' | 'ip'.

DtIndicator

You can use the DtIndicator directive the same way as in the <dt-table> to indicate a warning/error in a row. This will result in a Problem indicator being shown in front of the row.

Options & Properties & Methods

DtTreeTable

DtTreeTableRow

DtTreeControl

Methods

DtTreeFlattener<T, F>

| getChildren | (row: T) => (Observable<T[]> | T[] | undefined | null) | | function that returns an observable containing the child rows, the child rows, undefined or null | | getLevel | (row: T) => number | | accessor fn for the level of the row | | isExpandable | (row: T) => boolean | | function that returns wether a node is expandable | | transformFunction | (row: T, level: number) => F | | function that transforms from type T to flat type F |