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Cascading DropDownList with Tree Grid editing in JavaScript Tree Grid control

20 Apr 2021 / 3 minutes to read

You can achieve the Cascading DropDownList with Tree Grid Editing by using the Cell Edit Template feature.

In the below demo, Cascading DropDownList rendered for Priority and Duration column.

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

let priorityData: { [key: string]: Object }[] = [
  { priorityName: "Normal", priorityId: "1" },
  { priorityName: "High", priorityId: "2" }
];
let durationData: { [key: string]: Object }[] = [
  { durationValue: 2, priorityId: "1", durationId: 2 },
  { durationValue: 3, priorityId: "1", durationId: 3 },
  { durationValue: 4, priorityId: "1", durationId: 4 },
  { durationValue: 11, priorityId: "2", durationId: 11 },
  { durationValue: 15, priorityId: "2", durationId: 15 },
  { durationValue: 20, priorityId: "2", durationId: 20 }
];
let priorityElem: HTMLElement;
let priorityObj: DropDownList;

let durationElem: HTMLElement;
let durationObj: DropDownList;

TreeGrid.Inject(Edit, Toolbar);

let treegrid: TreeGrid = new TreeGrid({
  dataSource: projectData,
  idMapping: "TaskID",
  parentIdMapping: "parentID",
  treeColumnIndex: 1,
  height: 273,
  toolbar: ["Add", "Edit", "Delete", "Update", "Cancel"],
  editSettings: {
    allowEditing: true,
    allowAdding: true,
    allowDeleting: true,
    mode: "Row"
  },
  columns: [
    { field: "TaskID", headerText: "Task ID", textAlign: "Right", isPrimaryKey: true, 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: 90, editType: "datepickeredit",
      format: { skeleton: "yMd", type: "date" }
    },
    { field: "Priority", headerText: "Priority", width: 90, editType: "dropdownedit",
      edit: {
        create: () => {
          priorityElem = document.createElement("input");
          return priorityElem;
        },
        read: () => {
          return priorityObj.text;
        },
        destroy: () => {
          priorityObj.destroy();
        },
        write: () => {
          priorityObj = new DropDownList({
            dataSource: new DataManager(priorityData),
            fields: { value: "priorityId", text: "priorityName" },
            change: () => {
              durationObj.enabled = true;
              let tempQuery: Query = new Query().where(
                "priorityId",
                "equal",
                priorityObj.value
              );
              durationObj.query = tempQuery;
              durationObj.text = null;
              durationObj.dataBind();
            },
            placeholder: "Select a priority",
            floatLabelType: "Never"
          });
          priorityObj.appendTo(priorityElem);
        }
      }
    },
    { field: "Duration", headerText: "Duration", textAlign: "Right", editType: "dropdownedit", width: 90,
      edit: {
        create: () => {
          durationElem = document.createElement("input");
          return durationElem;
        },
        read: () => {
          return durationObj.text;
        },
        destroy: () => {
          durationObj.destroy();
        },
        write: () => {
          durationObj = new DropDownList({
            dataSource: new DataManager(durationData),
            fields: { value: "durationId", text: "durationValue" },
            enabled: false,
            placeholder: "Select a duration",
            floatLabelType: "Never"
          });
          durationObj.appendTo(durationElem);
        }
      }
    },
    { field: "Progress", headerText: "Progress", textAlign: "Right", width: 90 }
  ]
});
treegrid.appendTo("#TreeGrid");
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#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}
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<!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="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="//cdn.syncfusion.com/ej2/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>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='TreeGrid'></div>        
    </div>
</body>
</html>