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Virtual Scrolling in Vue Gantt component

08 Oct 2021 / 6 minutes to read

Virtual Scroll support in Gantt allows you to load large amount of data without performance degradation. To enable Virtual Scrolling, you need to inject VirtualScroll module in Gantt.

Row Virtualization

Row virtualization allows you to load and render a large number of tasks in Gantt with effective performance. In this mode, all tasks are fetched initially from the datasource and rendered in the DOM within a compact viewport area.

The number of records displayed in the Gantt is determined by the height.

This mode can be enable by setting the enableVirtualization property to true.

Source
Preview
app.vue
datasource.js
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<template>
     <div>
        <ejs-gantt ref='gantt'
            :dataSource= "data"
            :taskFields= "taskFields"
            :allowSelection= "true"
            :enableVirtualization= "true"
            :labelSettings= "labelSettings"
            :height= "height"
            :treeColumnIndex= "1"
            :highlightWeekends= "true"
            :columns= "columns"
            :splitterSettings= "splitterSettings">
        </ejs-gantt>
    </div>
</template>
<script>
import Vue from "vue";
import { GanttPlugin, Selection, VirtualScroll } from "@syncfusion/ej2-vue-gantt";
Vue.use(GanttPlugin);
export default Vue.extend({
  data: function() {
      return{
            data: [
    {
        TaskID: 1, TaskName: 'Product concept',StartDate: new Date('04/02/2019'), EndDate: new Date('04/21/2019'),
        parentID: 0
    },
    {
        TaskID: 2, TaskName: 'Defining the product and its usage', StartDate: new Date('04/02/2019'),
        Duration: 3, Progress: 30, parentID: 1
    },
    {
        TaskID: 3, TaskName: 'Defining target audience', StartDate: new Date('04/02/2019'),
        parentID: 1, Duration: 3
    },
    {
        TaskID: 4, TaskName: 'Prepare product sketch and notes', StartDate: new Date('04/05/2019'),
        Duration: 2, parentID: 1, Progress: 30
    },
    {
        TaskID: 5, TaskName: 'Concept approval', StartDate: new Date('04/08/2019'),
        parentID: 0, Duration: 0
    },
    {
        TaskID: 6, TaskName: 'Market research', StartDate: new Date('04/02/2019'),
        parentID: 0, EndDate: new Date('04/21/2019')
    },
    {
        TaskID: 7, TaskName: 'Demand analysis', StartDate: new Date('04/04/2019'),
        EndDate: new Date('04/21/2019'), parentID: 6
    },
    {
        TaskID: 8, TaskName: 'Customer strength', StartDate: new Date('04/09/2019'),
        Duration: 4, parentID: 7, Progress: 30
    },
    {
        TaskID: 9, TaskName: 'Market opportunity analysis', StartDate: new Date('04/09/2019'),
        Duration: 4, parentID: 7
    },
    {
        TaskID: 10, TaskName: 'Competitor analysis', StartDate: new Date('04/15/2019'),
        Duration: 4, parentID: 6, Progress: 30
    },
    {
        TaskID: 11, TaskName: 'Product strength analsysis', StartDate: new Date('04/15/2019'),
        Duration: 4, parentID: 6
    },
    {
        TaskID: 12, TaskName: 'Research complete', StartDate: new Date('04/18/2019'),
        Duration: 0, parentID: 6
    },
    {
        TaskID: 13, TaskName: 'Product design and development', StartDate: new Date('04/04/2019'),
        parentID: 0, EndDate: new Date('04/21/2019')
    },
    {
        TaskID: 14, TaskName: 'Functionality design', StartDate: new Date('04/19/2019'),
        Duration: 3, parentID: 13, Progress: 30
    },
    {
        TaskID: 15, TaskName: 'Quality design', StartDate: new Date('04/19/2019'),
        Duration: 3, parentID: 13
    },
    {
        TaskID: 16, TaskName: 'Define reliability', StartDate: new Date('04/24/2019'),
        Duration: 2, Progress: 30, parentID: 13
    },
    {
        TaskID: 17, TaskName: 'Identifying raw materials', StartDate: new Date('04/24/2019'),
        Duration: 2, parentID: 13
    },
    {
        TaskID: 18, TaskName: 'Define cost plan', StartDate: new Date('04/04/2019'),
        parentID: 13, EndDate: new Date('04/21/2019')
    },
    {
        TaskID: 19, TaskName: 'Manufacturing cost', StartDate: new Date('04/26/2019'),
        Duration: 2, Progress: 30, parentID: 18
    },
    {
        TaskID: 20, TaskName: 'Selling cost', StartDate: new Date('04/26/2019'),
        Duration: 2, parentID: 18
    },
    {
        TaskID: 21, TaskName: 'Development of the final design', StartDate: new Date('04/30/2019'),
        parentID: 13, EndDate: new Date('04/21/2019')
    },
    {
        TaskID: 22, TaskName: 'Defining dimensions and package volume', StartDate: new Date('04/30/2019'),
        Duration: 2, parentID: 21, Progress: 30
    },
    {
        TaskID: 23, TaskName: 'Develop design to meet industry standards', StartDate: new Date('05/02/2019'),
        Duration: 2, parentID: 21
    },
    {
        TaskID: 24, TaskName: 'Include all the details', StartDate: new Date('05/06/2019'),
        Duration: 3, parentID: 21
    },
    {
        TaskID: 25, TaskName: 'CAD computer-aided design', StartDate: new Date('05/09/2019'),
        Duration: 3, parentID: 13, Progress: 30
    },
    {
        TaskID: 26, TaskName: 'CAM computer-aided manufacturing', StartDate: new Date('09/14/2019'),
        Duration: 3, parentID: 13
    },
    {
        TaskID: 27, TaskName: 'Design complete', StartDate: new Date('05/16/2019'),
        Duration: 0, parentID: 13
    },
    {
        TaskID: 28, TaskName: 'Prototype testing', StartDate: new Date('05/17/2019'),
        Duration: 4, Progress: 30, parentID: 0
    },
    {
        TaskID: 29, TaskName: 'Include feedback', StartDate: new Date('05/17/2019'),
        Duration: 4, parentID: 0
    },
    {
        TaskID: 30, TaskName: 'Manufacturing', StartDate: new Date('05/23/2019'),
        Duration: 5, Progress: 30, parentID: 0
    },
    {
        TaskID: 31, TaskName: 'Assembling materials to finsihed goods', StartDate: new Date('05/30/2019'),
        Duration: 5, parentID: 0
    },
    {
        TaskID: 32, TaskName: 'Feedback and testing', StartDate: new Date('04/04/2019'),
        parentID: 0, EndDate: new Date('04/21/2019'),
    },
    {
        TaskID: 33, TaskName: 'Internal testing and feedback', StartDate: new Date('06/06/2019'),
        Duration: 3, parentID: 32, Progress: 45
    },
    {
        TaskID: 34, TaskName: 'Customer testing and feedback', StartDate: new Date('06/11/2019'),
        Duration: 3, parentID: 32, Progress: 50
    },
    {
        TaskID: 35, TaskName: 'Final product development', StartDate: new Date('04/04/2019'),
        parentID: 0, EndDate: new Date('04/21/2019'),
    },
    {
        TaskID: 36, TaskName: 'Important improvements', StartDate: new Date('06/14/2019'),
        Duration: 4, Progress: 30, parentID: 35
    },
    {
        TaskID: 37, TaskName: 'Address any unforeseen issues', StartDate: new Date('06/14/2019'),
        Duration: 4, Progress: 30, parentID: 35
    },
    {
        TaskID: 38, TaskName: 'Final product', StartDate: new Date('04/04/2019'),
        parentID: 0, EndDate: new Date('04/21/2019'),
    },
    {
        TaskID: 39, TaskName: 'Branding product', StartDate: new Date('06/20/2019'),
        Duration: 4, parentID: 38
    },
    {
        TaskID: 40, TaskName: 'Marketing and presales', StartDate: new Date('06/26/2019'), Duration: 4,
        Progress: 30, parentID: 38
    }
];

let virtualData = [];
let projId: number = 1;
for (let i: number = 0; i < 50; i++) {
    let x: number = virtualData.length + 1;
    let parent: any = {};
    /* tslint:disable:no-string-literal */
    parent['TaskID'] = x;
    parent['TaskName'] = 'Project ' + (i + 1);
    virtualData.push(parent);
    for (let j: number = 0; j < tempData.length; j++) {
        let subtasks: any = {};
        /* tslint:disable:no-string-literal */
        subtasks['TaskID'] = tempData[j].TaskID + x;
        subtasks['TaskName'] = tempData[j].TaskName;
        subtasks['StartDate'] = tempData[j].StartDate;
        subtasks['Duration'] = tempData[j].Duration;
        subtasks['Progress'] = tempData[j].Progress;
        subtasks['parentID'] = tempData[j].parentID + x;
        virtualData.push(subtasks);
    }
},
data: virtualData,
            taskFields: {
                id: 'TaskID',
                name: 'TaskName',
                startDate: 'StartDate',
                endDate: 'EndDate',
                duration: 'Duration',
                progress: 'Progress',
                parentID: 'parentID'
            },
            columns: [
               { field: 'TaskID' },
                { field: 'TaskName' },
                { field: 'StartDate' },
                { field: 'Duration' },
                { field: 'Progress' }
            ],
            height: '450px',
            labelSettings: {
               taskLabel: 'Progress'
            },
            splitterSettings: {
                columnIndex: 2
            }
      };
  },
  provide: {
      gantt: [ Selection, VirtualScroll]
  }
});
</script>
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define(["require", "exports"], function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.projectNewData = [
        {
            TaskID: 1,
            TaskName: 'Project initiation',
            StartDate: new Date('03/29/2019'),
            EndDate: new Date('04/21/2019'),
            subtasks: [
                {
                    TaskID: 2, TaskName: 'Identify site location', StartDate: new Date('03/29/2019'), Duration: 2,
                    Progress: 30, Work: 16, resources: [{ resourceId: 1, Unit: 70 }, 6]
                },
                {
                    TaskID: 3, TaskName: 'Perform soil test', StartDate: new Date('03/29/2019'), Duration: 4,
                    resources: [2, 3, 5], Work: 96
                },
                {
                    TaskID: 4, TaskName: 'Soil test approval', StartDate: new Date('03/29/2019'), Duration: 1,
                    Work: 16, resources: [8, { resourceId: 9, Unit: 50 }], Progress: 30
                },
            ]
        },
        {
            TaskID: 5,
            TaskName: 'Project estimation', StartDate: new Date('03/29/2019'), EndDate: new Date('04/21/2019'),
            subtasks: [
                {
                    TaskID: 6, TaskName: 'Develop floor plan for estimation', StartDate: new Date('03/29/2019'),
                    Duration: 3, Progress: 30, resources: [{ resourceId: 4, Unit: 50 }], Work: 30
                },
                {
                    TaskID: 7, TaskName: 'List materials', StartDate: new Date('04/01/2019'), Duration: 3,
                    Work: 48, resources: [4, 8]
                },
                {
                    TaskID: 8, TaskName: 'Estimation approval', StartDate: new Date('04/01/2019'),
                    Duration: 2, Work: 60, resources: [12, { resourceId: 5, Unit: 70 }]
                }
            ]
        },
        {
            TaskID: 9, TaskName: 'Sign contract', StartDate: new Date('04/01/2019'), Duration: 1,
            Progress: 30, resources: [12], Work: 24
        }
    ];
    exports.editingResources = [
        { resourceId: 1, resourceName: 'Martin Tamer' },
        { resourceId: 2, resourceName: 'Rose Fuller' },
        { resourceId: 3, resourceName: 'Margaret Buchanan' },
        { resourceId: 4, resourceName: 'Fuller King' },
        { resourceId: 5, resourceName: 'Davolio Fuller' },
        { resourceId: 6, resourceName: 'Van Jack' },
        { resourceId: 7, resourceName: 'Fuller Buchanan' },
        { resourceId: 8, resourceName: 'Jack Davolio' },
        { resourceId: 9, resourceName: 'Tamer Vinet' },
        { resourceId: 10, resourceName: 'Vinet Fuller' },
        { resourceId: 11, resourceName: 'Bergs Anton' },
        { resourceId: 12, resourceName: 'Construction Supervisor' }
    ];
});

Limitations for Virtual Scroll

  • Due to the element height limitation in browsers, the maximum number of records loaded is limited by the browser capacity.
  • Cell selection will not be persisted.
  • The number of records rendered will be determined by the height property.
  • It is necessary to mention the height of the Gantt in pixels when enabling Virtual Scrolling.
  • Currently, we do not have support for Row Drag and Drop when virtualization is enabled.
  • Virtual Scroll does not support Multi Taskbar support in Resource View.