Cascading drop down list with treegrid editing in EJ2 JavaScript Treegrid control

27 Apr 202310 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.

ej.treegrid.TreeGrid.Inject(ej.treegrid.Edit, ej.treegrid.Toolbar);

var priorityData = [
  { priorityName: "Normal", priorityId: "1" },
  { priorityName: "High", priorityId: "2" }
];
var durationData = [
  { 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 }
];
var priorityElem;
var priorityObj;

var durationElem;
var durationObj;

var treeGrid = new ej.treegrid.TreeGrid({
  dataSource: window.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 ej.dropdowns.DropDownList({
            dataSource: new ej.data.DataManager(priorityData),
            fields: { value: "priorityId", text: "priorityName" },
            change: () => {
              durationObj.enabled = true;
              var tempQuery = new ej.data.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 ej.dropdowns.DropDownList({
            dataSource: new ej.data.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");
<!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/ej2/23.2.4/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-treegrid/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
    
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/23.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="TreeGrid"></div>        
    </div>

<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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.