Splitting and merging tasks in Angular Gantt component

26 Mar 20257 minutes to read

Splitting task at load time

To split task at load time, we can define segment details in both hierarchical and self-referential way. Refer below link for more details.

• Split task at load time

Split task dynamically

The task can be split dynamically, either by using the context menu or dialog.

• Dialog: Segments tab is rendered in add/edit dialog, when the taskFields.segments or taskFields.segmentId property is mapped. Using this tab, we can split the task based on the original start and end date of a particular task.

• Context menu: When the taskFields.segments or taskFields.segmentId property is mapped and the enableContextMenu property is enabled, Split Task item will be included in the context menu.

app.component.ts

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { GanttModule, ContextMenuService, EditService } from '@syncfusion/ej2-angular-gantt'
import { SelectionService, ToolbarService } from '@syncfusion/ej2-angular-gantt'




import { Component, ViewEncapsulation, OnInit } from '@angular/core';
import { ToolbarItem, EditSettingsModel } from '@syncfusion/ej2-angular-gantt';
import { Gantt } from '@syncfusion/ej2-gantt';

@Component({
imports: [
         GanttModule
    ],

providers: [SelectionService, ContextMenuService, EditService, ToolbarService],
standalone: true,
    selector: 'app-root',
    template:
       `<ejs-gantt id="ganttDefault" height="450px" [dataSource]="data" [taskFields]="taskSettings" [editSettings]="editSettings" [toolbar]="toolbar" [enableContextMenu]="true"></ejs-gantt>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent{
    // Data for Gantt
    public data?: object[];
    public taskSettings?: object;
    public editSettings?: EditSettingsModel;
    public toolbar?: ToolbarItem[];
    public ngOnInit(): void {
        this.data =  [
            {
            TaskID: 1,
            TaskName: 'Project Initiation',
            StartDate: new Date('04/02/2019'),
            EndDate: new Date('04/21/2019'),
            subtasks: [
                { TaskID: 2, TaskName: 'Identify Site location', StartDate: new Date('04/02/2019'), Duration: 4, Progress: 50,
                Segments: [
                    { StartDate: new Date("04/02/2019"), Duration: 2 },
                    { StartDate: new Date("04/04/2019"), Duration: 2 }
                  ] },
                { TaskID: 3, TaskName: 'Perform Soil test', StartDate: new Date('04/02/2019'), Duration: 4, Progress: 50  },
                { TaskID: 4, TaskName: 'Soil test approval', StartDate: new Date('04/02/2019'), Duration: 4 , Progress: 50 },
            ]
        },
        {
            TaskID: 5,
            TaskName: 'Project Estimation',
            StartDate: new Date('04/02/2019'),
            EndDate: new Date('04/21/2019'),
            subtasks: [
                { TaskID: 6, TaskName: 'Develop floor plan for estimation', StartDate: new Date('04/04/2019'), Duration: 3, Progress: 50 },
                { TaskID: 7, TaskName: 'List materials', StartDate: new Date('04/04/2019'), Duration: 3, Progress: 50 },
                { TaskID: 8, TaskName: 'Estimation approval', StartDate: new Date('04/04/2019'), Duration: 3, Progress: 50 }
            ]
        }
        ];
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            endDate: 'EndDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks',
            segments: 'Segments'
        };
        this.editSettings = {
            allowAdding:true,
            allowEditing: true,
            allowDeleting: true
            };
        this.toolbar = ['Add', 'Edit', 'Update', 'Delete', 'Cancel', 'ExpandAll', 'CollapseAll'];
    }
}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Merge tasks

The split tasks can be merged either by using the Merge Task item of the Context menu or by using the dialog. We can also merge the tasks, by simply dragging the segments together in the UI.

Limitations of Split tasks

1. Parent and milestone tasks cannot be split into segments.
2. The task must have a width greater than the timeline unit cell in order to be split.
3. Split task is not supported with Multi taskbar.