---

name: syncfusion-verified description: Use when implementing, editing, or discussing any SyncFusion EJ2 React component (Grid, Gantt, Schedule, Kanban, Dialog, etc). Contains only officially verified best practices from SyncFusion documentation. For styling/layout/icons, also use syncfusion-styling skill. Theme-agnostic rules that work with Fluent2, Material, Bootstrap, etc. allowed-tools: Read, Grep, Glob, WebFetch

SyncFusion EJ2 React - Verified Best Practices

This skill contains only officially verified rules from SyncFusion documentation.

🎯 CORE PRINCIPLES (Verified)

1. MODULE INJECTION - MANDATORY ✅

Source: SyncFusion Grid/Gantt/Schedule official documentation

Features like paging, sorting, filtering, editing require explicit module injection:

import { GridComponent, Inject, Page, Sort, Filter } from '@syncfusion/ej2-react-grids';

// ✅ CORRECT - Modules injected
<GridComponent allowPaging={true} allowSorting={true}>
  <Inject services={[Page, Sort, Filter]} />
</GridComponent>

// ❌ WRONG - Features won't work without Inject
<GridComponent allowPaging={true} allowSorting={true} />

Common service modules by component:

Grid:

import { Page, Sort, Filter, Group, Edit, Toolbar } from '@syncfusion/ej2-react-grids';
<Inject services={[Page, Sort, Filter, Group, Edit, Toolbar]} />

Gantt:

import { Edit, Filter, Sort, Selection } from '@syncfusion/ej2-react-gantt';
<Inject services={[Edit, Filter, Sort, Selection]} />

Schedule:

import { Day, Week, WorkWeek, Month, Agenda } from '@syncfusion/ej2-react-schedule';
<Inject services={[Day, Week, WorkWeek, Month, Agenda]} />

TreeGrid:

import { Page, Sort, Filter, Edit, Toolbar } from '@syncfusion/ej2-react-treegrid';
<Inject services={[Page, Sort, Filter, Edit, Toolbar]} />

Kanban: No Inject required

---

2. DIRECT IMPORTS ✅

Source: All SyncFusion official examples

Import components directly from SyncFusion packages:

// ✅ CORRECT - Direct import
import { GridComponent, ColumnsDirective, ColumnDirective } from '@syncfusion/ej2-react-grids';
import { DialogComponent } from '@syncfusion/ej2-react-popups';
import { GanttComponent } from '@syncfusion/ej2-react-gantt';
import { ScheduleComponent } from '@syncfusion/ej2-react-schedule';
import { KanbanComponent } from '@syncfusion/ej2-react-kanban';

// ❌ AVOID - Custom wrappers (unless absolutely necessary)
import { MyCustomGrid } from './components/MyCustomGrid';

---

3. THEME CSS IMPORTS ✅

Source: SyncFusion Theme Documentation

Recommended approach: Use optimized lite CSS files

// main.tsx or App.tsx
// Fluent2 theme
import '@syncfusion/ej2/fluent2-lite.css';

// OR individual component imports (larger bundle)
import '@syncfusion/ej2-base/styles/fluent2.css';
import '@syncfusion/ej2-buttons/styles/fluent2.css';
import '@syncfusion/ej2-react-grids/styles/fluent2.css';
// ... etc

For other themes: Replace fluent2 with material, bootstrap, fabric, etc.

Theme customization: Use Theme Studio for custom themes

---

4. GRID EDITING MODES ✅

Source: SyncFusion Grid Editing Documentation

Three official edit modes:

const editSettings = {
  allowEditing: true,
  allowAdding: true,
  allowDeleting: true,
  mode: 'Normal' // or 'Dialog', 'Batch'
};

<GridComponent editSettings={editSettings}>
  <Inject services={[Edit, Toolbar]} />
</GridComponent>

Mode descriptions:

• Normal: Inline editing, one row at a time
• Dialog: Opens edit form in dialog popup
• Batch: Edit multiple cells/rows, then click Update to save all

Editable columns require:

• isPrimaryKey={true} on ID column
• editType prop: 'numericedit', 'dropdownedit', 'datepickeredit', etc.

<ColumnDirective
  field="price"
  editType="numericedit"
  edit={{ params: { format: 'N2', min: 0 } }}
/>

---

5. DIALOG VISIBILITY CONTROL ✅

Source: SyncFusion Dialog Documentation

Control dialog visibility with visible prop:

const [isVisible, setIsVisible] = useState(false);

<DialogComponent
  visible={isVisible}
  isModal={true}
  close={() => setIsVisible(false)}
  header="Dialog Title"
>
  <div>Dialog content</div>
</DialogComponent>

Key props:

• visible: Boolean to show/hide
• isModal: Boolean for modal overlay
• close: Event handler when dialog closes
• target: Optional container element

---

6. BUTTONCOMPONENT ONCLICK IN DIALOG - KNOWN ISSUE ✅

Source: SyncFusion Support Forum (React 17 event delegation bug)

Problem: ButtonComponent onClick doesn't work inside DialogComponent in React 17+

Official Solutions:

Option 1 - Use content property (Recommended by SF):

const dialogContent = () => (
  <div>
    <ButtonComponent onClick={handleClick}>Save</ButtonComponent>
  </div>
);

<DialogComponent content={dialogContent} />

Option 2 - Use buttons prop:

const dialogButtons = [
  {
    click: handleSave,
    buttonModel: { content: 'Save', isPrimary: true }
  }
];

<DialogComponent buttons={dialogButtons} />

Option 3 - Use native HTML buttons with SF classes:

<DialogComponent>
  <button className="e-btn e-primary" onClick={handleSave}>
    Save
  </button>
</DialogComponent>

Option 4 - Set proper target:

<DialogComponent target="#app-container">
  <ButtonComponent onClick={handleClick}>Save</ButtonComponent>
</DialogComponent>

---

7. DATA BINDING ✅

Source: SyncFusion Data Binding Documentation

Two approaches: Local data or DataManager

Local array:

const data = [
  { id: 1, name: 'Task 1', status: 'Open' },
  { id: 2, name: 'Task 2', status: 'InProgress' }
];

<GridComponent dataSource={data} />

Remote data with DataManager:

import { DataManager, UrlAdaptor } from '@syncfusion/ej2-data';

const dataManager = new DataManager({
  url: 'https://api.example.com/tasks',
  adaptor: new UrlAdaptor(),
  crossDomain: true
});

<GridComponent dataSource={dataManager} />

---

8. GANTT TASK FIELDS MAPPING ✅

Source: SyncFusion Gantt Documentation

Always map required task fields:

const taskFields = {
  id: 'TaskID',
  name: 'TaskName',
  startDate: 'StartDate',
  duration: 'Duration',
  progress: 'Progress',
  dependency: 'Predecessor',  // For dependencies
  child: 'subtasks'            // For hierarchical data
};

<GanttComponent taskFields={taskFields} />

Predecessor format for dependencies:

// String format (not number!)
{ TaskID: 3, Predecessor: '2' }      // Finish-to-Start
{ TaskID: 4, Predecessor: '2FS+2' }  // FS with 2-day lag
{ TaskID: 5, Predecessor: '3SS-1' }  // Start-to-Start with -1 day lag

Dependency types:

• FS: Finish-to-Start (default)
• SF: Start-to-Finish
• SS: Start-to-Start
• FF: Finish-to-Finish

---

9. SCHEDULE EVENT DATA FORMAT ✅

Source: SyncFusion Schedule Documentation

Events must use Date objects (not strings):

// ✅ CORRECT - Date objects
const events = [
  {
    Id: 1,
    Subject: 'Meeting',
    StartTime: new Date(2025, 9, 25, 10, 0), // Month is 0-indexed!
    EndTime: new Date(2025, 9, 25, 12, 0),
    IsAllDay: false
  }
];

// ❌ WRONG - String dates won't display
const events = [
  {
    Id: 1,
    Subject: 'Meeting',
    StartTime: '2025-10-25',
    EndTime: '2025-10-26'
  }
];

Month indexing: January = 0, December = 11

---

10. PERFORMANCE OPTIMIZATION ✅

Source: SyncFusion Performance Documentation

Virtual Scrolling for large datasets (>1000 rows):

// Grid
<GridComponent
  dataSource={largeData}
  enableVirtualization={true}
  height="600px"  // Fixed height required for virtualization
/>

// Gantt
<GanttComponent
  enableVirtualization={true}
  enableTimelineVirtualization={true}
/>

// Kanban
<KanbanComponent
  enableVirtualization={true}
  height="600px"
/>

Pagination for better UX:

<GridComponent
  allowPaging={true}
  pageSettings={{
    pageSize: 20,
    pageCount: 5,
    pageSizes: [10, 20, 50, 100]
  }}
>
  <Inject services={[Page]} />
</GridComponent>

---

📚 COMPONENT QUICK REFERENCE

GridComponent

import {
  GridComponent,
  ColumnsDirective,
  ColumnDirective,
  Inject,
  Page,
  Sort,
  Filter,
  Group,
  Edit,
  Toolbar
} from '@syncfusion/ej2-react-grids';

<GridComponent
  dataSource={data}
  allowPaging={true}
  allowSorting={true}
  allowFiltering={true}
  editSettings={{ allowEditing: true, mode: 'Normal' }}
  toolbar={['Add', 'Edit', 'Delete', 'Update', 'Cancel']}
>
  <ColumnsDirective>
    <ColumnDirective field="id" isPrimaryKey={true} />
    <ColumnDirective field="name" headerText="Name" />
    <ColumnDirective field="price" editType="numericedit" />
  </ColumnsDirective>
  <Inject services={[Page, Sort, Filter, Group, Edit, Toolbar]} />
</GridComponent>

GanttComponent

import {
  GanttComponent,
  Inject,
  Edit,
  Selection,
  Toolbar
} from '@syncfusion/ej2-react-gantt';

<GanttComponent
  dataSource={tasks}
  taskFields={{
    id: 'TaskID',
    name: 'TaskName',
    startDate: 'StartDate',
    duration: 'Duration',
    dependency: 'Predecessor'
  }}
  editSettings={{ allowEditing: true }}
  toolbar={['Add', 'Edit', 'Delete']}
>
  <Inject services={[Edit, Selection, Toolbar]} />
</GanttComponent>

ScheduleComponent

import {
  ScheduleComponent,
  ViewsDirective,
  ViewDirective,
  Inject,
  Day,
  Week,
  Month
} from '@syncfusion/ej2-react-schedule';

<ScheduleComponent
  currentView="Week"
  eventSettings={{ dataSource: events }}
>
  <ViewsDirective>
    <ViewDirective option="Day" />
    <ViewDirective option="Week" />
    <ViewDirective option="Month" />
  </ViewsDirective>
  <Inject services={[Day, Week, Month]} />
</ScheduleComponent>

DialogComponent

import { DialogComponent } from '@syncfusion/ej2-react-popups';

const dialogButtons = [
  { click: handleSave, buttonModel: { content: 'Save', isPrimary: true } },
  { click: handleClose, buttonModel: { content: 'Cancel' } }
];

<DialogComponent
  visible={isOpen}
  isModal={true}
  header="Dialog Title"
  buttons={dialogButtons}
  close={handleClose}
>
  <div>Dialog content</div>
</DialogComponent>

KanbanComponent

import {
  KanbanComponent,
  ColumnsDirective,
  ColumnDirective
} from '@syncfusion/ej2-react-kanban';

<KanbanComponent
  dataSource={cards}
  keyField="Status"
  cardSettings={{
    contentField: 'Summary',
    headerField: 'Title'
  }}
>
  <ColumnsDirective>
    <ColumnDirective headerText="To Do" keyField="Open" />
    <ColumnDirective headerText="In Progress" keyField="InProgress" />
    <ColumnDirective headerText="Done" keyField="Close" />
  </ColumnsDirective>
</KanbanComponent>

---

🔗 VERIFICATION SOURCES

All rules in this skill are verified against:

• Official Documentation: https://ej2.syncfusion.com/react/documentation/
• Theme Studio: https://ej2.syncfusion.com/themestudio/
• Support Forum: https://www.syncfusion.com/forums/ (for known bugs)
• API Reference: https://ej2.syncfusion.com/react/documentation/api/

When in doubt: Always consult official SyncFusion documentation using WebFetch tool.

---

⚠️ THEME INDEPENDENCE

All rules in this skill are theme-agnostic:

• ✅ Works with Fluent2, Material, Bootstrap, Fabric, Tailwind CSS, etc.
• ✅ Only CSS import path changes between themes
• ✅ Component API remains identical

Current project theme: Fluent2 (see CLAUDE.md for project-specific preferences)

---

Skill Version: 1.1 (Verified) Created: 2025-10-25 Updated: 2025-10-25 (added styling skill reference) Verification: All rules verified against SyncFusion official documentation Theme: Theme-agnostic (tested with Fluent2) Related Skills: syncfusion-styling (for layout/colors/icons)