Indent in Angular Treegrid component

9 Jan 20236 minutes to read

The Indent and Outdent feature will help to change the hierarchy level of rows in tree grid. The indent action moves the selected row as the last child of its previous row, whereas the outdent action moves the selected row as a sibling to its parent row.

To use the indent and outdent feature, inject the RowDD module in the Tree Grid. The tree grid toolbar has the built-in items to execute indent and outdent actions. Define this by using the toolbar property.

app.component.ts

import { Component, OnInit, ViewEncapsulation, ViewChild } from '@angular/core';
import { sampleData } from './datasource';
import { ToolbarItems } from '@syncfusion/ej2-angular-treegrid';

@Component({
    selector: 'app-container',
    template: `<ejs-treegrid [dataSource]='data'  [treeColumnIndex]='1' height='270' childMapping='subtasks' selectedRowIndex='2' [toolbar]='toolbarOptions' >
        <e-columns>
                    <e-column field='taskID' headerText='Task ID' [isPrimaryKey]='true' textAlign='Right' width=90></e-column>
                    <e-column field='taskName' headerText='Task Name' textAlign='Left' width=180></e-column>
                    <e-column field='priority' headerText='Priority' textAlign='Right' width=90></e-column>
                    <e-column field='duration' headerText='Duration' textAlign='Right' width=80></e-column>
        </e-columns>
                </ejs-treegrid>`
})
export class AppComponent implements OnInit {

    public data: Object[];
    public toolbarOptions: ToolbarItems[];

    ngOnInit(): void {
        this.data = sampleData;
        this.toolbarOptions = ['Indent', 'Outdent'];
    }
}

app.module.ts

import { NgModule,ViewChild } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { TreeGridModule } from '@syncfusion/ej2-angular-treegrid';
import { RowDDService, ToolbarService } from '@syncfusion/ej2-angular-treegrid';
import { AppComponent } from './app.component';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        TreeGridModule,
        ButtonModule,
        DropDownListAllModule,
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [RowDDService, ToolbarService]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Indent/Outdent a row programmatically

You can change the hierarchy level of record programmatically using indent and outdent methods by passing the record that needs to be indent or outdent.
To get the records you can use getCurrentViewRecords method of the tree grid.

app.component.ts

import { Component, OnInit, ViewEncapsulation, ViewChild } from '@angular/core';
import { sampleData } from './datasource';

@Component({
    selector: 'app-container',
    template: `
    <button ejs-button (click)="Indenting()">Indent</button>
    <button ejs-button (click)="Outdenting()">Outdent</button>
    <ejs-treegrid [dataSource]='data'  [treeColumnIndex]='1' height='270' childMapping='subtasks' selectedRowIndex='2' >
        <e-columns>
                    <e-column field='taskID' headerText='Task ID' [isPrimaryKey]='true' textAlign='Right' width=90></e-column>
                    <e-column field='taskName' headerText='Task Name' textAlign='Left' width=180></e-column>
                    <e-column field='priority' headerText='Priority' textAlign='Right' width=90></e-column>
                    <e-column field='duration' headerText='Duration' textAlign='Right' width=80></e-column>
        </e-columns>
                </ejs-treegrid>`
})
export class AppComponent implements OnInit {
    public treegrid: TreeGridComponent;
    public data: Object[];

    ngOnInit(): void {
        this.data = sampleData;
    }

    public Indenting(): void {
        this.treegrid.indent(this.treegrid.getCurrentViewRecords()[2]);
    }

    public Outdenting(): void {
        this.treegrid.outdent(this.treegrid.getCurrentViewRecords()[2]);
    }
}

app.module.ts

import { NgModule,ViewChild } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { TreeGridModule } from '@syncfusion/ej2-angular-treegrid';
import { RowDDService } from '@syncfusion/ej2-angular-treegrid';
import { AppComponent } from './app.component';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        TreeGridModule,
        ButtonModule,
        DropDownListAllModule,
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [RowDDService]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);