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ForeignKey column in JavaScript TreeGrid control

27 Jul 2021 / 2 minutes to read

Since Tree Grid Databinding concept is of hierarchy relationship, we do not provide in-built support for foreignKey datasource.

To display the foreignKey value at initial rendering, we can use the queryCellInfo event of the Tree Grid and also by using the editType and columns.edit properties of Tree Grid Column, we can render Dropdownlist with external or foreign dataSource.

Source
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index.ts
index.css
index.html
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import { TreeGrid, Edit, Toolbar, ITreeData } from "@syncfusion/ej2-treegrid";
import { foreignKeyData, dropData } from './datasource.ts';
import { DataManager, Query } from "@syncfusion/ej2-data";
import { QueryCellInfoEventArgs, Column, IEditCell } from "@syncfusion/ej2-grids";

TreeGrid.Inject(Edit,Toolbar);

let treegrid: TreeGrid = new TreeGrid({
  dataSource: foreignKeyData,
  childMapping: "Children",
  treeColumnIndex: 1,
  height: 269,
  editSettings: {
    allowEditing: true,
    allowAdding: true,
    allowDeleting: true,
    mode: "Cell"
  },
  toolbar: ["Add", "Delete", "Update", "Cancel"],
  queryCellInfo: queryCellInfo,
  columns: [
    { field: "EmpID", headerText: "EmpID", textAlign: "Right", isPrimaryKey: true, width: 70 },
    { field: "Name", headerText: "Employee Name", width: 70 },
    { field: "DOB", headerText: "DOB", textAlign: "Right", width: 70, editType: "datepickeredit",
      format: { skeleton: "yMd", type: "date" } },
    { field: "EmployeeID", headerText: "EmployeeID", textAlign: "Right", editType: "dropdownedit",
      edit: {
        params: {
          dataSource: new DataManager(dropData),
          fields: { text: "EmployeeName", value: "EmployeeID" },
          query: new Query()
        }
      },
      width: 70 },
    { field: "Country", headerText: "Country", width: 90, textAlign: "Right" }
  ]
});
treegrid.appendTo("#TreeGrid");
function queryCellInfo(args: QueryCellInfoEventArgs) {
  if ((args.column as Column).field === "EmployeeID") {
    for (var i = 0; i < dropData.length; i++) {
      let data: Object = args.data as Object;
      if (data[(args.column as Column).field] === dropData[i]["EmployeeID"]) {
        (args.cell as HTMLElement).innerText = dropData[i]["EmployeeName"]; // assign the foreignkey field value to the innertext
      }
    }
  }
}
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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>