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Scrolling in React TreeGrid component

18 May 2022 / 3 minutes to read

The scrollbar will be displayed in the treegrid when content exceeds the element width or height. The vertical and horizontal scrollbars will be displayed based on the following criteria:

  • The vertical scrollbar appears when the total height of rows present in the treegrid exceeds its element height.
  • The horizontal scrollbar appears when the sum of columns width exceeds the treegrid element width.
  • The height and width are used to set the treegrid height and width, respectively.

The default value for height and width is auto.

Set width and height

To specify the width and height of the scroller in the pixel, set the pixel value to a number.

Source
Preview
App.jsx
App.tsx
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import { ColumnDirective, ColumnsDirective, TreeGridComponent } from '@syncfusion/ej2-react-treegrid';
import * as React from 'react';
import './App.css';
import { sampleData } from './datasource';
export default class App extends React.Component {
    render() {
        return <TreeGridComponent dataSource={sampleData} treeColumnIndex={1} childMapping='subtasks' height='315' width='400'>
        <ColumnsDirective>
          <ColumnDirective field='taskID' headerText='Task ID' width='90' textAlign='Right'/>
          <ColumnDirective field='taskName' headerText='Task Name' width='180'/>
          <ColumnDirective field='startDate' headerText='Start Date' width='120' format='yMd' textAlign='Right' type='date'/>
          <ColumnDirective field='duration' headerText='Duration' width='110' textAlign='Right'/>
        </ColumnsDirective>
    </TreeGridComponent>;
    }
}
Copied to clipboard
import { ColumnDirective, ColumnsDirective, TreeGridComponent } from '@syncfusion/ej2-react-treegrid';
import * as React from 'react';
import './App.css';
import { sampleData } from './datasource';

export default class App extends React.Component<{}, {}>{
public render() {
    return <TreeGridComponent dataSource={sampleData} treeColumnIndex={1} childMapping='subtasks'
     height='315' width='400'>
        <ColumnsDirective>
          <ColumnDirective field='taskID' headerText='Task ID' width='90' textAlign='Right'/>
          <ColumnDirective field='taskName' headerText='Task Name' width='180'/>
          <ColumnDirective field='startDate' headerText='Start Date' width='120' format='yMd' textAlign='Right' type='date' />
          <ColumnDirective field='duration' headerText='Duration' width='110' textAlign='Right' />
        </ColumnsDirective>
    </TreeGridComponent>
}
}

Responsive with parent container

Specify the width and height as 100% to make the treegrid element fill its parent container. Setting the height to 100% requires the treegrid parent element to have explicit height.

Source
Preview
App.jsx
App.tsx
Copied to clipboard
import { ColumnDirective, ColumnsDirective, TreeGridComponent } from '@syncfusion/ej2-react-treegrid';
import * as React from 'react';
import './App.css';
import { sampleData } from './datasource';
export default class App extends React.Component {
    render() {
        return <TreeGridComponent dataSource={sampleData} treeColumnIndex={1} childMapping='subtasks' height='100%' width='100%'>
        <ColumnsDirective>
          <ColumnDirective field='taskID' headerText='Task ID' width='90' textAlign='Right'/>
          <ColumnDirective field='taskName' headerText='Task Name' width='180'/>
          <ColumnDirective field='startDate' headerText='Start Date' width='120' format='yMd' textAlign='Right' type='date'/>
          <ColumnDirective field='duration' headerText='Duration' width='110' textAlign='Right'/>
        </ColumnsDirective>
    </TreeGridComponent>;
    }
}
Copied to clipboard
import { ColumnDirective, ColumnsDirective, TreeGridComponent } from '@syncfusion/ej2-react-treegrid';
import * as React from 'react';
import './App.css';
import { sampleData } from './datasource';

export default class App extends React.Component<{}, {}>{
public render() {
    return <TreeGridComponent dataSource={sampleData} treeColumnIndex={1} childMapping='subtasks'
    height='100%' width='100%'>
        <ColumnsDirective>
          <ColumnDirective field='taskID' headerText='Task ID' width='90' textAlign='Right'/>
          <ColumnDirective field='taskName' headerText='Task Name' width='180'/>
          <ColumnDirective field='startDate' headerText='Start Date' width='120' format='yMd' textAlign='Right' type='date' />
          <ColumnDirective field='duration' headerText='Duration' width='110' textAlign='Right' />
        </ColumnsDirective>
    </TreeGridComponent>
}
}

Scroll to selected row

You can scroll the treegrid content to the selected row position by using the rowSelected event.

Source
Preview
App.jsx
App.tsx
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import { NumericTextBoxComponent } from '@syncfusion/ej2-react-inputs';
import { ColumnDirective, ColumnsDirective, TreeGridComponent } from '@syncfusion/ej2-react-treegrid';
import * as React from 'react';
import './App.css';
import { sampleData } from './datasource';
export default class App extends React.Component {
    onChange() {
        if (this.treegrid && this.numeric) {
            this.treegrid.selectRow(parseInt(this.numeric.getText(), 10));
        }
    }
    rowSelected(args) {
        if (this.treegrid) {
            const rowHeight = this.treegrid.getRows()[this.treegrid.getSelectedRowIndexes()[0]].scrollHeight;
            this.treegrid.getContent().children[0].scrollTop = rowHeight * this.treegrid.getSelectedRowIndexes()[0];
        }
    }
    render() {
        this.onChange = this.onChange.bind(this);
        this.rowSelected = this.rowSelected.bind(this);
        return (<div>
        <NumericTextBoxComponent format={'N'} placeholder={'Enter index to select a row'} width={200} showSpinButton={false} min={0} change={this.onChange} ref={(n) => this.numeric = n}/>
         <TreeGridComponent dataSource={sampleData} treeColumnIndex={1} childMapping='subtasks' height='270' width='100%' rowSelected={this.rowSelected} ref={g => this.treegrid = g}>
        <ColumnsDirective>
          <ColumnDirective field='taskID' headerText='Task ID' width='90' textAlign='Right'/>
          <ColumnDirective field='taskName' headerText='Task Name' width='160'/>
          <ColumnDirective field='startDate' headerText='Start Date' width='90' format='yMd' textAlign='Right' type='date'/>
          <ColumnDirective field='duration' headerText='Duration' width='80' textAlign='Right'/>
        </ColumnsDirective>
    </TreeGridComponent></div>);
    }
}
Copied to clipboard
import { RowSelectEventArgs } from '@syncfusion/ej2-grids';
import { NumericTextBox, NumericTextBoxComponent } from '@syncfusion/ej2-react-inputs';
import { ColumnDirective, ColumnsDirective, TreeGridComponent } from '@syncfusion/ej2-react-treegrid';
import { TreeGrid } from '@syncfusion/ej2-react-treegrid';
import * as React from 'react';
import './App.css';
import { sampleData } from './datasource';

export default class App extends React.Component<{}, {}>{
public treegrid: TreeGrid | null;
public numeric: NumericTextBox | null;

public onChange(){
    if (this.treegrid && this.numeric) {
        this.treegrid.selectRow(parseInt(this.numeric.getText(), 10));
    }
}

public rowSelected(args: RowSelectEventArgs) {
    if (this.treegrid) {
        const rowHeight: number = this.treegrid.getRows()[this.treegrid.getSelectedRowIndexes()[0]].scrollHeight;
        this.treegrid.getContent().children[0].scrollTop = rowHeight * this.treegrid.getSelectedRowIndexes()[0];
    }
}

public render() {
    this.onChange = this.onChange.bind(this);
    this.rowSelected = this.rowSelected.bind(this);
    return (<div>
        <NumericTextBoxComponent format={'N'} placeholder={'Enter index to select a row'} width={200}
         showSpinButton={false} min={0} change={this.onChange} ref={(n: any) => this.numeric = n}/>
         <TreeGridComponent dataSource={sampleData} treeColumnIndex={1} childMapping='subtasks'
          height='270' width='100%' rowSelected={this.rowSelected} ref={g => this.treegrid = g} >
        <ColumnsDirective>
          <ColumnDirective field='taskID' headerText='Task ID' width='90' textAlign='Right'/>
          <ColumnDirective field='taskName' headerText='Task Name' width='160'/>
          <ColumnDirective field='startDate' headerText='Start Date' width='90' format='yMd' textAlign='Right' type='date' />
          <ColumnDirective field='duration' headerText='Duration' width='80' textAlign='Right' />
        </ColumnsDirective>
    </TreeGridComponent></div>)
}
}
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