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Gridlines in JavaScript (ES5) Diagram control

08 May 2023 / 5 minutes to read

Gridlines are the pattern of lines drawn behind the diagram elements. It provides a visual guidance while dragging or arranging the objects on the diagram surface.

The model’s snapSettings property is used to customize the gridlines and control the snapping behavior in the diagram.

Customize the gridlines visibility

The snapSettings.snapConstraints enables you to show/hide the gridlines. The following code example illustrates how to show or hide gridlines.

If you need to enable snapping, then inject snapping module into the diagram.

Source

Preview

index.js

index.html

var snapSettings = {
    constraints: (ej.diagrams.SnapConstraints.ShowLines)
};
var diagram = new ej.diagrams.Diagram({
    width: '800px',
    height: '500px',
    snapSettings: snapSettings
}, '#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">
    
    <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>

To show only horizontal/vertical gridlines or to hide gridlines, refer to Constraints.

Appearance

The appearance of the gridlines can be customized by using a set of predefined properties.

The horizontalGridLines and the verticalGridLines properties allow to customize the appearance of the horizontal and vertical gridlines respectively.
The horizontal gridlines lineColor and lineDashArray properties are used to customizes the line color and line style of the horizontal gridlines.
The vertical gridlines lineColor and lineDashArray properties are used to customizes the line color and line style of the vertical gridlines.

The following code example illustrates how to customize the appearance of gridlines.

Source

Preview

index.js

index.html

var snapSettings = {
    constraints: (ej.diagrams.SnapConstraints.ShowLines),
    horizontalGridlines: {
        lineColor: 'blue',
        lineDashArray: '2 2'
    },
    verticalGridlines: {
        lineColor: 'blue',
        lineDashArray: '2 2'
    }
};
var diagram = new ej.diagrams.Diagram({
    width: '800px',
    height: '500px',
    snapSettings: snapSettings
}, '#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">
    
    <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>

Line intervals

Thickness and the space between gridlines can be customized by using horizontal gridlines’s linesInterval and vertical gridlines’s linesInterval properties. In the lines interval collections, values at the odd places are referred as the thickness of lines and values at the even places are referred as the space between gridlines.

The following code example illustrates how to customize the thickness of lines and the line intervals.

Source

Preview

index.js

index.html

var snapSettings = {
    constraints: (ej.diagrams.SnapConstraints.ShowLines),
    horizontalGridlines: { lineIntervals:[1.25, 14, 0.25, 15, 0.25, 15, 0.25, 15, 0.25, 15],lineColor: 'blue', lineDashArray: '2 2' },
    verticalGridlines: { lineIntervals:[1.25, 14, 0.25, 15, 0.25, 15, 0.25, 15, 0.25, 15],lineColor: 'blue', lineDashArray: '2 2' }
};
var diagram = new ej.diagrams.Diagram({
    width: '800px', height: '500px', 
    snapSettings: snapSettings
},'#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">
    
    <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>

Snapping

Snap to lines

This feature allows the diagram objects to snap to the nearest intersection of gridlines while being dragged or resized. This feature enables easier alignment during layout or design.

Snapping to gridlines can be enabled/disabled with the snapSettings.snapConstraints. The following code example illustrates how to enable/disable the snapping to gridlines.

Source

Preview

index.js

index.html

let nodes = [{
    id: 'node1',
    width: 100,
    height: 100,
    offsetX: 100,
    offsetY: 100,
    style: {
        strokeColor: '#6BA5D7',
        fill: '#6BA5D7'
    }
}];

var snapSettings = {
    constraints: (ej.diagrams.SnapConstraints.SnapToLines) | (ej.diagrams.SnapConstraints.ShowLines)
};
var diagram = new ej.diagrams.Diagram({
    width: '800px',
    height: '500px',
    nodes: nodes,
    getNodeDefaults: function(node) {
        node.height = 100;
        node.width = 100;
        node.style.fill = '#6BA5D7';
        node.style.strokeColor = 'white';
        return node;
    },
    snapSettings: snapSettings
}, '#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">
    
    <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>

Customization of snap intervals

By default, the objects are snapped towards the nearest gridline. The gridline or position towards where the diagram object snaps can be customized with the horizontal gridlines’s snapInterval and the vertical gridlines’s snapInterval properties.

Source

Preview

index.js

index.html

let nodes = [{
    id: 'node1',
    width: 100,
    height: 100,
    offsetX: 100,
    offsetY: 100,
    style: {
        strokeColor: '#6BA5D7',
        fill: '#6BA5D7'
    }
}];

var snapSettings = {
    horizontalGridlines: {
        snapIntervals: [10]
    },
    verticalGridlines: {
        snapIntervals: [10]
    },
    constraints: (ej.diagrams.SnapConstraints.All)
};
var diagram = new ej.diagrams.Diagram({
    width: '800px',
    height: '500px',
    getNodeDefaults: function(node) {
        node.height = 100;
        node.width = 100;
        node.style.fill = '#6BA5D7';
        node.style.strokeColor = 'white';
        return node;
    },
    nodes: nodes,
    snapSettings: snapSettings
}, '#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">
    
    <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>

Snap to objects

The snap to object provides visual cues to assist with aligning and spacing diagram elements. A node can be snapped with its neighboring objects based on certain alignments. Such alignments are visually represented as smart guides.

The snapObjectDistance property allows you to define minimum distance between the selected object and the nearest object.

The snapAngle property allows you to define the snap angle by which the object needs to be rotated.

The snapConstraints property allows you to enable or disable the certain features of the snapping, refer to snapConstraints.

The snapLineColor property allows you to define the color of the snapline.

Source

Preview

index.js

index.html

let nodes = [{
    id: 'node1',
    width: 100,
    height: 100,
    offsetX: 100,
    offsetY: 100,
    style: {
        strokeColor: '#6BA5D7',
        fill: '#6BA5D7'
    }
}];

var snapSettings = {
    snapObjectDistance: 10,
    snapAngle: 10,
    snapLineColor: 'red'
};
var diagram = new ej.diagrams.Diagram({
    width: '800px',
    height: '500px',
    nodes: nodes,
    getNodeDefaults: function(node) {
        node.height = 100;
        node.width = 100;
        node.style.fill = '#6BA5D7';
        node.style.strokeColor = 'white';
        return node;
    },
    snapSettings: snapSettings
}, '#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">
    
    <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>

Contents

Customize the gridlines visibility
Appearance
Line intervals
Snapping
Snap to lines
Customization of snap intervals
Snap to objects

Contents

Customize the gridlines visibility
Appearance
Line intervals
Snapping
Snap to lines
Customization of snap intervals
Snap to objects