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Tooltip in JavaScript (ES5) Diagram control

08 May 2023 / 7 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
ToolTip During Drag ToolTip During Resize ToolTip During 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.

Source
Preview
index.html
Copied to clipboard
<!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">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-diagrams/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-navigations/styles/fabric.css" rel="stylesheet">
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="element"></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>

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.

Copied to clipboard
//Initializes the diagram component
let diagram: Diagram = new Diagram({
    width: '100%', height: '350px',
	//Disables mouse over tooltip at runtime
	tooltip: null
}, '#element');

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.

Source
Preview
index.js
index.html
Copied to clipboard
/**
 * Tooltip sample
 */
var diagram;

var node = {
    id: "node1",
    width: 100,
    height: 100,
    annotations: [{
        id: 'label',
        content: 'Rectangle',
        offset: {
            x: 0.5,
            y: 0.5
        },
        style: {
            color: 'white'
        }
    }],
    offsetX: 200,
    offsetY: 200,
    style: {
        strokeColor: '#6BA5D7',
        fill: '#6BA5D7'
    },
    constraints: ej.diagrams.NodeConstraints.Default | ej.diagrams.NodeConstraints.Tooltip,
    //Defines mouse over tooltip for a node
    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'
    },
};
diagram = new ej.diagrams.Diagram({
    width: '650px',
    height: '350px',
    constraints: ej.diagrams.DiagramConstraints.Default | ej.diagrams.DiagramConstraints.Tooltip,
    nodes: [node],
}, '#element');
Copied to clipboard
<!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">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-diagrams/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-navigations/styles/fabric.css" rel="stylesheet">
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="element"></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>

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.

Source
Preview
index.js
index.html
Copied to clipboard
/**
 * Tooltip sample
 */
var diagram;

var node = {
    id: "node1",
    width: 100,
    height: 100,
    annotations: [{
        id: 'label',
        content: 'Rectangle',
        offset: {
            x: 0.5,
            y: 0.5
        },
        style: {
            color: 'white'
        }
    }],
    offsetX: 200,
    offsetY: 200,
    style: {
        strokeColor: '#6BA5D7',
        fill: '#6BA5D7'
    },
    constraints: ej.diagrams.NodeConstraints.Default | ej.diagrams.NodeConstraints.Tooltip,
    //Defines mouse over tooltip for a node
        tooltip: {
            //Sets the content of the Tooltip
            content: getContent(),
            //Sets the position of the Tooltip
            position: 'TopLeft',
            //Sets the tooltip position relative to the node
            relativeMode: 'Object'
        }
};
diagram = new ej.diagrams.Diagram({
    width: '100%',
    height: '350px',
    constraints: ej.diagrams.DiagramConstraints.Default | ej.diagrams.DiagramConstraints.Tooltip,
    nodes: [node],
}, '#element');

function getContent() {
    var tooltipContent = document.createElement('div');
    tooltipContent.innerHTML = '<div> <rect  style="background-color: #f4f4f4; color: black; border-width:1px;border-style: solid;border-color: #d3d3d3; border-radius: 8px;white-space: nowrap;"> Tooltip !!! </rect> </div>';
    return tooltipContent;
}
Copied to clipboard
<!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">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-diagrams/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-navigations/styles/fabric.css" rel="stylesheet">
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="element"></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>

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.

Source
Preview
index.js
index.html
Copied to clipboard
/**
 * Tooltip sample
 */
var diagram;

var node = {
    id: "node1",
    width: 100,
    height: 100,
    annotations: [{
        id: 'label',
        content: 'Rectangle',
        offset: {
            x: 0.5,
            y: 0.5
        },
        style: {
            color: 'white'
        }
    }],
    offsetX: 200,
    offsetY: 200,
    style: {
        strokeColor: '#6BA5D7',
        fill: '#6BA5D7'
    },
    constraints: (ej.diagrams.NodeConstraints.Default & ~ej.diagrams.NodeConstraints.InheritTooltip) | ej.diagrams.NodeConstraints.Tooltip,
    //Defines mouse over tooltip for a node
    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'
    },
};
diagram = new ej.diagrams.Diagram({
    width: '100%',
    height: '350px',
    constraints: ej.diagrams.DiagramConstraints.Default | ej.diagrams.DiagramConstraints.Tooltip,
    nodes: [node],
}, '#element');
Copied to clipboard
<!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">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-diagrams/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-navigations/styles/fabric.css" rel="stylesheet">
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="element"></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>

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.

Source
Preview
index.js
index.html
Copied to clipboard
/**
 * Tooltip sample
 */
var diagram;

var node = {
    id: "node1",
    width: 100,
    height: 100,
    annotations: [{
        id: 'label',
        content: 'Rectangle',
        offset: {
            x: 0.5,
            y: 0.5
        },
        style: {
            color: 'white'
        }
    }],
    offsetX: 200,
    offsetY: 200,
    style: {
        strokeColor: '#6BA5D7',
        fill: '#6BA5D7'
    },
    constraints: ej.diagrams.NodeConstraints.Default | ej.diagrams.NodeConstraints.Tooltip,
    //Defines mouse over tooltip for a node
    tooltip: {
        //Sets the content of the Tooltip
        content: 'Node1',
        //Sets the tooltip position relative to the node
        relativeMode: 'Mouse'
    },
};
diagram = new ej.diagrams.Diagram({
    width: '650px',
    height: '350px',
    constraints: ej.diagrams.DiagramConstraints.Default | ej.diagrams.DiagramConstraints.Tooltip,
    nodes: [node],
}, '#element');
Copied to clipboard
<!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">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-diagrams/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-navigations/styles/fabric.css" rel="stylesheet">
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="element"></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>

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.

Source
Preview
index.js
index.html
Copied to clipboard
/**
 * Tooltip sample
 */
var diagram;
diagram = new ej.diagrams.Diagram({
    width: '650px',
    height: '350px',
    constraints: ej.diagrams.DiagramConstraints.Default | ej.diagrams.DiagramConstraints.Tooltip,
    //Defines nodes
    nodes: [{
        id: "node1",
        width: 100,
        height: 100,
        annotations: [{
            id: 'label',
            content: 'Rectangle',
            offset: {
                x: 0.5,
                y: 0.5
            },
            style: {
                color: 'white'
            }
        }],
        offsetX: 200,
        offsetY: 200,
        style: {
            strokeColor: '#6BA5D7',
            fill: '#6BA5D7'
        },
        constraints: ej.diagrams.NodeConstraints.Default | ej.diagrams.NodeConstraints.Tooltip,
        //Defines mouse over tooltip for a node
        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: 'FadeIn',
                    //Duration of the animation that is completed per animation cycle.
                    duration: 150,
                    //Indicating the waiting time before animation begins.
                    delay: 0
                },
                //Animation settings to be applied on the Tooltip, when it is closed.
                close: {
                    effect: 'FadeOut',
                    delay: 0
                }
            }
        },
    }]
}, '#element');
Copied to clipboard
<!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">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-diagrams/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-navigations/styles/fabric.css" rel="stylesheet">
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="element"></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>
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