Tooltip in Angular Diagram component

28 Sep 202324 minutes to read

In Graphical User Interface (GUI), the tooltip is a message that is displayed when mouse hovers over an element. The diagram provides tooltip support while dragging, resizing, rotating a node, and when the mouse hovers any diagram element.

Default tooltip

By default, diagram displays a tooltip to provide the size, position, and angle related information while dragging, resizing, and rotating. The following images illustrate how the diagram displays the node information during an interaction.

Drag	Resize	Rotate

Common tooltip for all nodes and connectors

The diagram provides support to show tooltip when the mouse hovers over any node/connector.

To show tooltip on mouse over, the tooltip property of diagram model needs to be set with the tooltip content and position as shown in the following example.

app.component.ts

import { Component, OnInit, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, DiagramConstraints, DiagramTooltipModel, ShapeStyleModel } from '@syncfusion/ej2-angular-diagrams';

@Component({
    selector: "app-container",
    template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults]="getNodeDefaults" [tooltip]="tooltip" [constraints]="constraints">
        <e-nodes>
            <e-node id='node1' [offsetX]=150 [offsetY]=150>
            </e-node>
        </e-nodes>
    </ejs-diagram>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    @ViewChild("diagram")
    public diagram?: DiagramComponent;
    public tooltip?: DiagramTooltipModel;
    public constraints?: DiagramConstraints;
    public getNodeDefaults(node: NodeModel): NodeModel {
        node.height = 100;
        node.width = 100;
        ((node as NodeModel).style as ShapeStyleModel).fill = "#6BA5D7";
        ((node as NodeModel).style as ShapeStyleModel).strokeColor = "White";
        return node;
    }
    ngOnInit(): void {
        this.tooltip = {
            content: 'Nodes',
            position: 'TopLeft'
        }
        this.constraints = DiagramConstraints.Default | DiagramConstraints.Tooltip
    }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, DiagramModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ ]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Disable tooltip at runtime

The tooltip on mouse over can be disabled by assigning the tooltip property as null. The following code example illustrates how to disable the mouse over tooltip at runtime.

@Component({
    selector: "app-container",
    template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [tooltip]="tooltip">
    </ejs-diagram>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    @ViewChild("diagram")
    public diagram: DiagramComponent;
    ngOnInit(): void {
        this.tooltip = null
    }
}

Tooltip for a specific node/connector

The tooltip can be customized for each node and connector. Remove the InheritTooltip option from the constraints of that node/connector. The following code example illustrates how to customize the tooltip for individual elements.

app.component.ts

import { Component, OnInit, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, NodeConstraints, DiagramTooltipModel, ShapeStyleModel } from '@syncfusion/ej2-angular-diagrams';

@Component({
    selector: "app-container",
    template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults]="getNodeDefaults">
        <e-nodes>
            <e-node id='node1' [offsetX]=150 [offsetY]=150  [tooltip]="tooltip" [constraints]="constraints">
            </e-node>
        </e-nodes>
    </ejs-diagram>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    @ViewChild("diagram")
    public diagram?: DiagramComponent;
    public tooltip?: DiagramTooltipModel;
    public constraints?: NodeConstraints;
    public getNodeDefaults(node: NodeModel): NodeModel {
        node.height = 100;
        node.width = 100;
        ((node as NodeModel).style as ShapeStyleModel).fill = "#6BA5D7";
        ((node as NodeModel).style as ShapeStyleModel).strokeColor = "White";
        return node;
    }
    ngOnInit(): void {
        this.tooltip = {
            //Sets the content of the Tooltip
            content: 'Node1',
            //Sets the position of the Tooltip
            position: 'BottomRight',
            //Sets the tooltip position relative to the node
            relativeMode: 'Object'
        }
        this.constraints = NodeConstraints.Default | NodeConstraints.Tooltip
    }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, DiagramModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ ]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Tooltip for Ports

The tooltip feature has been implemented to support Ports, providing the ability to display information or descriptions when the mouse hovers over them.

To display tooltips on mouseover, set the desired tooltip content by utilizing the tooltip property.

Tooltips for Ports can be enabled or disabled using the PortConstraints Tooltip property.

let ports: [{
        offset: {x: 1,y: 0.5},
        tooltip: {content: 'Port Tootip'},
        
        //enable Port Tooltip Constraints
        constraints: PortConstraints.Default | PortConstraints.ToolTip,
        
        //disable Port Tooltip Constraints
        constraints: PortConstraints.Default ~& PortConstraints.ToolTip
    }]

Dynamic modification of tooltip content is supported, allowing you to change the displayed tooltip content during runtime.

{
    //change tooltip content at run time
    diagram.nodes[0].ports[0].tooltip.content = 'New Tooltip Content';
    diagram.databind;
}

The following image illustrates how the diagram displays tooltips during an interaction with ports:

Here, the code provided below demonstrates the port tooltip Interaction.

app.component.ts

import { Component, OnInit, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, NodeConstraints, DiagramTooltipModel,PointPortModel,PortVisibility, PortConstraints, ShapeStyleModel } from '@syncfusion/ej2-angular-diagrams';

@Component({
    selector: "app-container",
    template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults]="getNodeDefaults">
        <e-nodes>
            <e-node id='node1' [offsetX]=150 [offsetY]=150  [tooltip]="tooltip" [constraints]="constraints">
            </e-node>
        </e-nodes>
    </ejs-diagram>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    @ViewChild("diagram")
    public diagram?: DiagramComponent;
    public tooltip?: DiagramTooltipModel;
    public constraints?: NodeConstraints;
    public port?: PointPortModel;
    public getNodeDefaults(node: NodeModel | any): NodeModel {
        node.height = 100;
        node.width = 100;
        node.ports[0]={
            offset: {
                x: 0.5,
                y: 0
            },
            visibility: PortVisibility.Visible,
            //Set the style for the port
            style: {
                fill: '#FFFFFF',
                strokeWidth: 1,
                strokeColor: 'black'
            },
            tooltip:{
                content:'Port Tooltip',
            },
            // Sets the shape of the port as Circle
            shape: 'Circle',
            constraints: PortConstraints.Default
        },
        ((node as NodeModel).style as ShapeStyleModel).fill = "#6BA5D7";
        ((node as NodeModel).style as ShapeStyleModel).strokeColor = "White";
        node.p
        return node;
    }
    ngOnInit(): void {
        this.tooltip = {
            //Sets the content of the Tooltip
            content: 'Node1',
            //Sets the position of the Tooltip
            position: 'BottomRight',
            //Sets the tooltip position relative to the node
            relativeMode: 'Object'
        }
        this.constraints = NodeConstraints.Default | NodeConstraints.Tooltip
    }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, DiagramModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ ]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Tooltip template content

Any text or image can be added to the tooltip, by default. To customize the tooltip layout or to create your own visualized element on the tooltip, template can be used.

The following code example illustrates how to add formatted HTML content to the tooltip.

app.component.ts

import { Component, OnInit, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, NodeConstraints, DiagramTooltipModel, ShapeStyleModel } from '@syncfusion/ej2-angular-diagrams';

@Component({
    selector: "app-container",
    template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults]="getNodeDefaults">
        <e-nodes>
            <e-node id='node1' [offsetX]=150 [offsetY]=150  [tooltip]="tooltip" [constraints]="constraints">
            </e-node>
        </e-nodes>
    </ejs-diagram>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    @ViewChild("diagram")
    public diagram?: DiagramComponent;
    public tooltip?: DiagramTooltipModel;
    public constraints?: NodeConstraints;
    public getNodeDefaults(node: NodeModel): NodeModel {
        node.height = 100;
        node.width = 100;
        ((node as NodeModel).style as ShapeStyleModel).fill = "#6BA5D7";
        ((node as NodeModel).style as ShapeStyleModel).strokeColor = "White";
        return node;
    }
    public getContent(): HTMLElement {
        let tooltipContent: HTMLElement = document.createElement('div');
        tooltipContent.innerHTML = '<div style="background-color: #f4f4f4; color: black; border-width:1px;border-style: solid;border-color: #d3d3d3; border-radius: 8px;white-space: nowrap;"> <span style="margin: 10px;"> Tooltip !!! </span> </div>';
        return tooltipContent;
    }
    ngOnInit(): void {
        this.tooltip = {
            //Sets the content of the Tooltip
            content: this.getContent(),
            //Sets the position of the Tooltip
            position: 'TopLeft',
            //Sets the tooltip position relative to the node
            relativeMode: 'Object'
        }
        this.constraints = (NodeConstraints.Default & ~NodeConstraints.InheritTooltip) | NodeConstraints.Tooltip
    }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, DiagramModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ ]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Tooltip alignments

Tooltip relative to object

The diagram provides support to show tooltip around the node/connector that is hovered by the mouse. The tooltip can be aligned by using the position property of the tooltip.

The relativeMode property of the tooltip defines whether the tooltip has to be displayed around the object or at the mouse position.

The following code example illustrates how to position the tooltip around object.

app.component.ts

import { Component, OnInit, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, NodeConstraints, DiagramTooltipModel, ShapeStyleModel } from '@syncfusion/ej2-angular-diagrams';

@Component({
    selector: "app-container",
    template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults]="getNodeDefaults">
        <e-nodes>
            <e-node id='node1' [offsetX]=150 [offsetY]=150  [tooltip]="tooltip" [constraints]="constraints">
            </e-node>
        </e-nodes>
    </ejs-diagram>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    @ViewChild("diagram")
    public diagram?: DiagramComponent;
    public tooltip?: DiagramTooltipModel;
    public constraints?: NodeConstraints;
    public getNodeDefaults(node: NodeModel): NodeModel {
        node.height = 100;
        node.width = 100;
        ((node as NodeModel).style as ShapeStyleModel).fill = "#6BA5D7";
        ((node as NodeModel).style as ShapeStyleModel).strokeColor = "White";
        return node;
    }
    ngOnInit(): void {
        this.tooltip = {
            //Sets the content of the Tooltip
            content: 'Node1',
            //Sets the position of the Tooltip
            position: 'BottomRight',
            //Sets the tooltip position relative to the node
            relativeMode: 'Object'
        }
        this.constraints = (NodeConstraints.Default & ~NodeConstraints.InheritTooltip) | NodeConstraints.Tooltip
    }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, DiagramModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ ]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Tooltip relative to mouse position

To display the tooltip at mouse position, need to set mouse option to the relativeMode property of the tooltip.

The following code example illustrates how to show tooltip at mouse position.

app.component.ts

import { Component, OnInit, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, NodeConstraints, DiagramTooltipModel, ShapeStyleModel } from '@syncfusion/ej2-angular-diagrams';

@Component({
    selector: "app-container",
    template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults]="getNodeDefaults">
        <e-nodes>
            <e-node id='node1' [offsetX]=150 [offsetY]=150  [tooltip]="tooltip" [constraints]="constraints">
            </e-node>
        </e-nodes>
    </ejs-diagram>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    @ViewChild("diagram")
    public diagram?: DiagramComponent;
    public tooltip?: DiagramTooltipModel;
    public constraints?: NodeConstraints;
    public getNodeDefaults(node: NodeModel): NodeModel {
        node.height = 100;
        node.width = 100;
        ((node as NodeModel).style as ShapeStyleModel).fill = "#6BA5D7";
        ((node as NodeModel).style as ShapeStyleModel).strokeColor = "White";
        return node;
    }
    ngOnInit(): void {
        this.tooltip = {
            //Sets the content of the Tooltip
            content: 'Node1',
            //Sets the position of the Tooltip
            position: 'BottomRight',
            //Sets the tooltip position relative to the node
            relativeMode: 'Mouse'
        }
        this.constraints = NodeConstraints.Default | NodeConstraints.Tooltip
    }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, DiagramModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ ]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Tooltip animation

To animate the tooltip, a set of specific animation effects are available, and it can be controlled by using the animation property. The animation property also allows you to set delay, duration, and various other effects of your choice.

app.component.ts

import { Component, OnInit, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, NodeConstraints, DiagramTooltipModel, ShapeStyleModel } from '@syncfusion/ej2-angular-diagrams';

@Component({
    selector: "app-container",
    template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults]="getNodeDefaults">
        <e-nodes>
            <e-node id='node1' [offsetX]=150 [offsetY]=150  [tooltip]="tooltip" [constraints]="constraints">
            </e-node>
        </e-nodes>
    </ejs-diagram>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    @ViewChild("diagram")
    public diagram?: DiagramComponent;
    public tooltip?: DiagramTooltipModel;
    public constraints?: NodeConstraints;
    public getNodeDefaults(node: NodeModel): NodeModel {
        node.height = 100;
        node.width = 100;
        ((node as NodeModel).style as ShapeStyleModel).fill = "#6BA5D7";
        ((node as NodeModel).style as ShapeStyleModel).strokeColor = "White";
        return node;
    }
    ngOnInit(): void {
        this.tooltip = {
            content: 'Node1',
            position: 'BottomCenter',
            relativeMode: 'Object',
            animation: {
                //Animation settings to be applied on the Tooltip, while it is being shown over the target.
                open: {
                    //Animation effect on the Tooltip is applied during open and close actions.
                    effect: 'ZoomIn',
                    //Duration of the animation that is completed per animation cycle.
                    duration: 1000,
                    //Indicating the waiting time before animation begins.
                    delay: 0
                },
                //Animation settings to be applied on the Tooltip, when it is closed.
                close: {
                    effect: 'ZoomOut',
                    duration: 500,
                    delay: 0
                }
            }
        }
        this.constraints = NodeConstraints.Default | NodeConstraints.Tooltip
    }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, DiagramModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ ]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);