Provide custom data source and enabling filtering to drop down list in EJ2 TypeScript Treegrid control

27 Apr 20236 minutes to read

You can provide data source to the DropDownList by using the params of columns.edit property.

While setting new data source using edit params, you must specify a new query property for the DropDownList as follows,

      edit: {
        params: {
          actionComplete: () => false,
          allowFiltering: true,
          dataSource: new DataManager(priorityData),
          fields: { text: "priorityName", value: "priorityName" },
          query: new Query()
        }
      }

You can also enable filtering for the DropDownList by passing the allowFiltering as true to the edit params.

In the below demo, DropDownList is rendered with custom dataSource for the Priority column and enabled filtering to search DropDownList items.

index.ts
index.html
import { TreeGrid, Edit, Toolbar } from "@syncfusion/ej2-treegrid";
import { projectData } from './datasource.ts';
import { Query, DataManager } from "@syncfusion/ej2-data";
import { IEditCell } from "@syncfusion/ej2-grids";

TreeGrid.Inject(Edit, Toolbar);
let priorityData: object[] = [
  { priorityName: "Normal", priorityId: "1" },
  { priorityName: "High", priorityId: "2" },
  { priorityName: "Low", priorityId: "3" },
  { priorityName: "Critical", priorityId: "4" },
  { priorityName: "Breaker", priorityId: "5" }
];

let treegrid: TreeGrid = new TreeGrid({
  dataSource: projectData,
  idMapping: "TaskID",
  parentIdMapping: "parentID",
  treeColumnIndex: 1,
  editSettings: {
    allowEditing: true,
    allowAdding: true,
    allowDeleting: true,
    mode: "Row"
  },
  toolbar: ["Add", "Edit", "Delete", "Update", "Cancel"],
  columns: [
    { field: "TaskID", headerText: "Task ID", isPrimaryKey: true, textAlign: "Right", width: 70 },
    { field: "TaskName", headerText: "Task Name", width: 100 },
    { field: "StartDate", headerText: "Start Date", textAlign: "Right", width: 100, editType: "datepickeredit",
      format: { skeleton: "yMd", type: "date" } },
    { field: "EndDate", headerText: "End Date", textAlign: "Right", width: 100, editType: "datepickeredit",
      format: { skeleton: "yMd", type: "date" } },
    { field: "Duration", headerText: "Duration", textAlign: "Right", width: 90 },
    { field: "Priority", headerText: "Priority", width: 90, editType: "dropdownedit",
      edit: {
        params: {
          actionComplete: () => false,
          allowFiltering: true,
          dataSource: new DataManager(priorityData),
          fields: { text: "priorityName", value: "priorityName" },
          query: new Query()
        }
      }
    }
  ]
});
treegrid.appendTo("#TreeGrid");
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Grid Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-treegrid/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-calendars/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    
    
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='TreeGrid'></div>        
    </div>
</body>
</html>

You can refer to our JavaScript Tree Grid feature tour page for its groundbreaking feature representations. You can also explore our JavaScript Tree Grid example JavaScript Tree Grid example to knows how to present and manipulate data.