Process the tree node operations using context menu in EJ2 TypeScript Treeview control
2 May 202311 minutes to read
You can intergrade the context menu with ‘TreeView’ component in order to perform the tree view related operations like add, remove and renaming node.
Following is an example which demonstrates the above cases which are used to manipulate tree view operations in the ‘select ‘ event of context menu.
import { enableRipple } from '@syncfusion/ej2-base';
import { ContextMenu, MenuEventArgs, MenuItemModel, ContextMenuModel, TreeView, BeforeOpenCloseMenuEventArgs, NodeClickEventArgs } from '@syncfusion/ej2-navigations';
enableRipple(true);
/**
* The node operation in tree view using context menu
*/
//define the data source for TreeView
let data: { [key: string]: Object } [] = [
{ id: '1', name: 'Local Disk (C:)', hasAttribute: { class:'remove rename'}, hasChild: true, expanded: true, },
{ id: '2', name: 'Program Files', pid: '1', hasChild: true },
{ id: '3', name: 'Windows NT', pid: '2' },
{ id: '4', name: 'Windows Mail', pid: '2' },
{ id: '5', name: 'Windows Photo Viewer', pid: '2' },
{ id: '6', name: 'Users', pid: '1', hasChild: true, expanded: true },
{ id: '7', name: 'Smith', pid: '6' },
{ id: '8', name: 'Public', pid: '6' },
{ id: '9', name: 'Admin', pid: '6' },
{ id: '10', name: 'Windows', pid: '1', hasChild: true },
{ id: '11', name: 'Boot', pid: '10' },
{ id: '12', name: 'FileManager', pid: '10' },
{ id: '13', name: 'System32', pid: '10' },
{ id: '14', name: 'Local Disk (D:)', hasAttribute: { class: 'remove' }, hasChild: true},
{ id: '15', name: 'Personals', pid: '14', hasChild: true },
{ id: '16', name: 'My photo.png', pid: '15' },
{ id: '17', name: 'Rental document.docx', pid: '15' },
{ id: '18', name: 'Pay slip.pdf', pid: '15' },
{ id: '19', name: 'Projects', pid: '14', hasChild: true },
{ id: '20', name: 'ASP Application', pid: '19' },
{ id: '21', name: 'TypeScript Application', pid: '19' },
{ id: '22', name: 'React Application', pid: '19' },
{ id: '23', name: 'Office', pid: '14', hasChild: true },
{ id: '24', name: 'Work details.docx', pid: '23' },
{ id: '25', name: 'Weekly report.docx', pid: '23' },
{ id: '26', name: 'Wish list.csv', pid: '23' },
{ id: '27', name: 'Local Disk (E:)', hasAttribute: { class: 'remove' }, hasChild: true },
{ id: '28', name: 'Pictures', pid: '27', hasChild: true },
{ id: '29', name: 'Wind.jpg', pid: '28' },
{ id: '30', name: 'Stone.jpg', pid: '28' },
{ id: '31', name: 'Home.jpg', pid: '28' },
{ id: '32', name: 'Documents', pid: '27', hasChild: true },
{ id: '33', name: 'Environment Pollution.docx', pid: '32' },
{ id: '34', name: 'Global Warming.ppt', pid: '32' },
{ id: '35', name: 'Social Network.pdf', pid: '32' },
{ id: '36', name: 'Study Materials', pid: '27', hasChild: true },
{ id: '37', name: 'UI-Guide.pdf', pid: '36' },
{ id: '38', name: 'Tutorials.zip', pid: '36' },
{ id: '39', name: 'TypeScript.7z', pid: '36' }
];
// Render the TreeView by mapping its fields property with data source properties
let treeObj: TreeView = new TreeView({
fields: { dataSource: data, id: 'id', text: 'name', parentID: 'pid', hasChildren: 'hasChild', htmlAttributes:'hasAttribute'},
nodeClicked: nodeClick
});
treeObj.appendTo('#tree');
function nodeClick(args: NodeClickEventArgs) {
if (args.event.which === 3) {
treeObj.selectedNodes = [args.node.getAttribute('data-uid')]
}
}
//Render the context menu with target as Treeview
let menuItems: MenuItemModel[] = [
{ text: 'Add New Item' },
{ text: 'Rename Item' },
{ text: 'Remove Item' }
];
let menuOptions: ContextMenuModel = {
target: '#tree',
items: menuItems,
select: menuclick,
beforeOpen: beforeopen
};
let menuObj: ContextMenu = new ContextMenu(menuOptions, '#contextmenu');
let index: number = 1;
function menuclick(args: MenuEventArgs) {
let targetNodeId: string = treeObj.selectedNodes[0];
if (args.item.text == "Add New Item") {
let nodeId: string = "tree_" + index;
let item: { [key: string]: Object } = { id: nodeId, name: "New Folder" };
treeObj.addNodes([item], targetNodeId, null);
index++;
data.push(item);
treeObj.beginEdit(nodeId);
}
else if (args.item.text == "Remove Item") {
treeObj.removeNodes([targetNodeId]);
}
else if (args.item.text == "Rename Item") {
treeObj.beginEdit(targetNodeId);
}
}
function beforeopen(args: BeforeOpenCloseMenuEventArgs) {
let targetNodeId: string = treeObj.selectedNodes[0];
let targetNode: Element = document.querySelector('[data-uid="' + targetNodeId + '"]');
if (targetNode.classList.contains('remove')) {
menuObj.enableItems(['Remove Item'], false);
}
else {
menuObj.enableItems(['Remove Item'], true);
}
if (targetNode.classList.contains('rename')) {
menuObj.enableItems(['Rename Item'], false);
}
else {
menuObj.enableItems(['Rename Item'], true);
}
}<!DOCTYPE html>
<html lang="en">
<head>
<title>Essential JS 2 for TreeView </title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="description" content="Essential JS 2 for TreeView UI Control" />
<meta name="author" content="Syncfusion" />
<link href="index.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-base/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-inputs/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-navigations/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='treeparent'>
<div id="tree"></div>
<ul id="contextmenu"></ul>
</div>
</div>
</body>
</html>