Context menu in EJ2 TypeScript Diagram control
18 Apr 202324 minutes to read
In graphical user interface (GUI), a context menu is a type of menu that appears when you perform right-click operation. Nested level of context menu items can be created. Diagram provides some in-built context menu items and allows to define custom menu items through the contextMenuSettings
property.
Customize context menu
The show
property helps you to enable/disable the context menu. Diagram provides some default context menu items to ease the execution of some frequently used commands. The following code illustrates how to enable the default context menu items.
import {
Diagram,
DiagramContextMenu,
ConnectorModel,
NodeModel,
DiagramBeforeMenuOpenEventArgs
} from '@syncfusion/ej2-diagrams';
import {
MenuEventArgs
} from '@syncfusion/ej2-navigations';
Diagram.Inject(DiagramContextMenu);
//Initializes the connector
let connector: ConnectorModel = {
id: 'connector1',
sourceID: 'node1',
targetID: 'node2',
type: 'Straight',
style: {
strokeColor : '#6BA5D7',
fill: '#6BA5D7',
strokeWidth : 2,
}
targetDecorator: {
style: {
fill : '#6BA5D7',
strokeColor : '#6BA5D7'
}
}
};
//Initializes the nodes
let node: NodeModel = {
id: 'node1',
width: 100,
height: 100,
offsetX: 100,
offsetY: 100,
style: {
fill: '#6BA5D7',
strokeColor: 'white',
strokeWidth: 1
},
annotations: [{
id: 'label1',
content: 'Rectangle1',
offset: {
x: 0.5,
y: 0.5
},
style: {
color: 'white'
}
}]
};
let node2: NodeModel = {
id: 'node2',
width: 100,
height: 100,
offsetX: 300,
offsetY: 100,
style: {
fill: '#6BA5D7',
strokeColor: 'white',
strokeWidth: 1
},
annotations: [{
id: 'label2',
content: 'Rectangle2',
offset: {
x: 0.5,
y: 0.5
},
style: {
color: 'white'
}
}]
};
//Initializes the Diagram component
let diagram: Diagram = new Diagram({
width: '100%',
height: '350px',
nodes: [node, node2],
connectors: [connector],
//Enables the context menu
contextMenuSettings: {
show: true,
}
}, '#element');
<!DOCTYPE html>
<html lang="en">
<head>
<title>EJ2 Diagram</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="description" content="Typescript UI Controls" />
<meta name="author" content="Syncfusion" />
<link href="index.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-base/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-buttons/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-popups/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-diagrams/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-navigations/styles/fabric.css" rel="stylesheet" />
<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='element'></div>
</div>
</body>
</html>
Context menu can be defined for individual node with the desired context menu items.
-
Apart from the default context menu items, define some additional context menu items. Those additional items have to be defined and added to the
items
property of the context menu. -
Set text and ID for context menu item using the context menu
text
andID
properties respectively. -
Set an image for the context menu item using the context menu url property.
-
The
iconCss
property defines the class/multiple classes separated by a space for the menu item that is used to include an icon. Menu item can include font icon and sprite image. -
The
target
property used to set the target to show the menu item. -
The
separator
property defines the horizontal lines that are used to separate the menu items. You cannot select the separators. You can enable separators to group the menu items using the separator property.
The following code example illustrates how to add custom context menu items.
import {
Diagram,
DiagramContextMenu,
ConnectorModel,
NodeModel,
DiagramBeforeMenuOpenEventArgs
} from '@syncfusion/ej2-diagrams';
import {
MenuEventArgs
} from '@syncfusion/ej2-navigations';
Diagram.Inject(DiagramContextMenu);
//Initializes the connector
let connector: ConnectorModel = {
id: 'connector1',
sourceID: 'node1',
targetID: 'node2',
type: 'Straight',
style: {
strokeColor : '#6BA5D7',
fill: '#6BA5D7',
strokeWidth : 2,
},
targetDecorator: {
style: {
fill : '#6BA5D7',
strokeColor : '#6BA5D7'
}
}
};
//Initializes the nodes
let node: NodeModel = {
id: 'node1',
width: 100,
height: 100,
offsetX: 100,
offsetY: 100,
style: {
fill: '#6BA5D7',
strokeColor: 'white',
strokeWidth: 1
},
annotations: [{
id: 'label1',
content: 'Rectangle1',
offset: {
x: 0.5,
y: 0.5
},
style: {
color: 'white'
}
}]
};
let node2: NodeModel = {
id: 'node2',
width: 100,
height: 100,
offsetX: 300,
offsetY: 100,
style: {
fill: '#6BA5D7',
strokeColor: 'white',
strokeWidth: 1
},
annotations: [{
id: 'label2',
content: 'Rectangle2',
offset: {
x: 0.5,
y: 0.5
},
style: {
color: 'white'
}
}]
};
//Initializes the Diagram component
let diagram: Diagram = new Diagram({
width: '100%',
height: '350px',
nodes: [node, node2],
connectors: [connector],
contextMenuSettings: {
//Enables the context menu
show: true,
// Defines the custom context menu items
items: [{
// Text to be displayed
text: 'Save',
//Sets the id for the item
id: 'save',
//ContextMenu can be visible based on the target in which you open the ContextMenu.
target: '.e-elementcontent',
// Sets the css icons for the item
iconCss: 'e-save'
},
{
text: 'Load',
id: 'load',
target: '.e-elementcontent',
iconCss: 'e-load'
},
{
text: 'Clear',
id: 'clear',
target: '.e-elementcontent',
iconCss: 'e-clear'
}
],
// Hides the default context menu items
showCustomMenuOnly: false,
}
}, '#element');
<!DOCTYPE html>
<html lang="en">
<head>
<title>EJ2 Diagram</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="description" content="Typescript UI Controls" />
<meta name="author" content="Syncfusion" />
<link href="index.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-base/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-buttons/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-popups/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-diagrams/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-navigations/styles/fabric.css" rel="stylesheet" />
<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='element'></div>
</div>
</body>
</html>
To display the custom context menu items alone, set the showCustomMenuOnly
property to true.
Template Support for Context menu
-
Diagram provides template support for context menu. The context menu items can be customized by using the
contextMenuBeforeItemRender
event. The contextMenuBeforeItemRender event triggers while rendering each menu item. -
In the following sample, the menu item is rendered with key code for specified action in ContextMenu using the template. Here, the key code is specified for the cut and copy at right corner of the menu items by adding a span element in the
contextMenuBeforeItemRender
event.
import {
Diagram,
DiagramContextMenu,
ConnectorModel,
NodeModel
} from '@syncfusion/ej2-diagrams';
import { MenuEventArgs } from '@syncfusion/ej2-navigations';
import { createElement } from '@syncfusion/ej2-base';
Diagram.Inject(DiagramContextMenu);
//Initializes the connector
let connector: ConnectorModel = {
id: 'connector1',
sourceID: 'node1',
targetID: 'node2',
style: {
strokeColor : '#6BA5D7',
fill: '#6BA5D7',
strokeWidth : 2,
},
targetDecorator: {
style: {
fill : '#6BA5D7',
strokeColor : '#6BA5D7'
}
}
};
//Initializes the nodes
let node: NodeModel = {
id: 'node1',
width: 100,
height: 100,
offsetX: 100,
offsetY: 100,
style: {
fill: '#6BA5D7',
strokeColor: 'white',
strokeWidth: 1
},
annotations: [{
id: 'label1',
content: 'Rectangle1',
offset: {
x: 0.5,
y: 0.5
},
style: {
color: 'white'
}
}]
};
let node2: NodeModel = {
id: 'node2',
width: 100,
height: 100,
offsetX: 300,
offsetY: 100,
style: {
fill: '#6BA5D7',
strokeColor: 'white',
strokeWidth: 1
},
annotations: [{
id: 'label2',
content: 'Rectangle2',
offset: {
x: 0.5,
y: 0.5
},
style: {
color: 'white'
}
}]
};
//Initializes the Diagram component
let diagram: Diagram = new Diagram({
width: '100%',
height: '350px',
nodes: [node, node2],
connectors: [connector],
contextMenuSettings: {
//Enables the context menu
show: true,
items: [{
text: 'Cut', id: 'Cut', target: '.e-diagramcontent',
iconCss: 'e-Cut'
},
{
text: 'Copy', id: 'Copy', target: '.e-diagramcontent',
iconCss: 'e-Copy'
}],
// Hides the default context menu items
showCustomMenuOnly: true,
},
contextMenuBeforeItemRender: (args: MenuEventArgs) => {
// To render template in li.
let shortCutSpan: HTMLElement = createElement('span');
let text: string = args.item.text;
let shortCutText: string = text === 'Cut' ? 'Ctrl + S' : (text === 'Copy' ?
'Ctrl + U' : 'Ctrl + Shift + I');
shortCutSpan.textContent = shortCutText;
args.element.appendChild(shortCutSpan);
shortCutSpan.setAttribute('class', 'shortcut');
}
}, '#element');
<!DOCTYPE html>
<html lang="en">
<head>
<title>EJ2 Diagram</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="description" content="Typescript UI Controls" />
<meta name="author" content="Syncfusion" />
<link href="index.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-base/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-buttons/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-popups/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-diagrams/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-navigations/styles/fabric.css" rel="stylesheet" />
<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='element'></div>
</div>
</body>
</html>
Context menu events
You would be notified with events, when you try to open the context menu items contextMenuOpen
and when you click the menu items contextMenuClick
.The following code example illustrates how to define those events.
import {
Diagram,
DiagramContextMenu,
DiagramBeforeMenuOpenEventArgs,
MenuEventArgs,
ConnectorModel,
NodeModel
} from '@syncfusion/ej2-diagrams';
Diagram.Inject(DiagramContextMenu);
//Initializes the connector
let connector: ConnectorModel = {
id: 'connector1',
sourceID: 'node1',
targetID: 'node2',
style: {
strokeColor : '#6BA5D7',
fill: '#6BA5D7',
strokeWidth : 2,
},
targetDecorator: {
style: {
fill : '#6BA5D7',
strokeColor : '#6BA5D7'
}
}
};
//Initializes the nodes
let node: NodeModel = {
id: 'node1',
width: 100,
height: 100,
offsetX: 100,
offsetY: 100,
style: {
fill: '#6BA5D7',
strokeColor: 'white',
strokeWidth: 1
},
annotations: [{
id: 'label1',
content: 'Rectangle1',
offset: {
x: 0.5,
y: 0.5
},
style: {
color: 'white'
}
}]
};
let node2: NodeModel = {
id: 'node2',
width: 100,
height: 100,
offsetX: 300,
offsetY: 100,
style: {
fill: '#6BA5D7',
strokeColor: 'white',
strokeWidth: 1
},
annotations: [{
id: 'label2',
content: 'Rectangle2',
offset: {
x: 0.5,
y: 0.5
},
style: {
color: 'white'
}
}]
};
//Initializes the Diagram component
let diagram: Diagram = new Diagram({
width: '100%',
height: '350px',
nodes: [node, node2],
connectors: [connector],
contextMenuSettings: {
//Enables the context menu
show: true,
items: [{
text: 'delete',
id: 'delete'
}],
// Hides the default context menu items
showCustomMenuOnly: false,
},
contextMenuOpen: function(args: DiagramBeforeMenuOpenEventArgs) {
//do your custom action here.
for (let item of args.items) {
if (item.text === 'delete') {
if (!diagram.selectedItems.nodes.length && !diagram.selectedItems.connectors.length) {
args.hiddenItems.push(item.text);
}
}
}
},
contextMenuClick: function(args: MenuEventArgs) {
//do your custom action here.
if (args.item.id === 'delete') {
if ((diagram.selectedItems.nodes.length + diagram.selectedItems.connectors.length) > 0) {
diagram.cut();
}
}
}
}, '#element');
<!DOCTYPE html>
<html lang="en">
<head>
<title>EJ2 Diagram</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="description" content="Typescript UI Controls" />
<meta name="author" content="Syncfusion" />
<link href="index.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-base/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-buttons/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-popups/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-diagrams/styles/material.css" rel="stylesheet" />
<link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-navigations/styles/fabric.css" rel="stylesheet" />
<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='element'></div>
</div>
</body>
</html>