Box and Whisker Chart in JavaScript Charts

18 Nov 201824 minutes to read

Box and Whisker

To render a box and whisker series in your chart, you need to follow a few steps to configure it correctly. Here’s a concise guide on how to do this:

Set the series type: Define the series type as BoxAndWhisker in your chart configuration. This indicates that the data should be represented as a box and whisker chart, which will plot segments to illustrate the statistical distribution of the data.
Data requirements: The y field of the Box and Whisker series requires a specific number of data points, with a minimum of five values needed to plot a segment.

index.js
index.html
var chartData = [
    { x: 'Development', y: [22, 22, 23, 25, 25, 25, 26, 27, 27, 28, 28, 29, 30, 32, 34, 32, 34, 36, 35, 38] },
    { x: 'Testing', y: [22, 33, 23, 25, 26, 28, 29, 30, 34, 33, 32, 31, 50] },
    { x: 'HR', y: [22, 24, 25, 30, 32, 34, 36, 38, 39, 41, 35, 36, 40, 56] },
    { x: 'Finance', y: [26, 27, 28, 30, 32, 34, 35, 37, 35, 37, 45] },
    { x: 'R&D', y: [26, 27, 29, 32, 34, 35, 36, 37, 38, 39, 41, 43, 58] },
    { x: 'Sales', y: [27, 26, 28, 29, 29, 29, 32, 35, 32, 38, 53] },
    { x: 'Inventory', y: [21, 23, 24, 25, 26, 27, 28, 30, 34, 36, 38] },
    { x: 'Graphics', y: [26, 28, 29, 30, 32, 33, 35, 36, 52] },
    { x: 'Training', y: [28, 29, 30, 31, 32, 34, 35, 36] }
];
var chart = new ej.charts.Chart({
    //Initializing Primary X Axis
    primaryXAxis: {
        valueType: 'Category'
    },
    //Initializing Chart Series
    series: [
        {
            type: 'BoxAndWhisker',
            dataSource: chartData,
            xName: 'x',
            yName: 'y',
            marker: {
                visible: true,
                width: 10,
                height: 10
            }
        }
    ]
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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://cdn.syncfusion.com/ej2/34.1.29/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>

Binding data with series

You can bind data to the chart using the dataSource property within the series configuration. This allows you to connect a JSON dataset or remote data to your chart. To display the data correctly, map the fields from the data to the chart series xName and yName properties.

index.js
index.html
var chartData = [
    { x: 'Development', y: [22, 22, 23, 25, 25, 25, 26, 27, 27, 28, 28, 29, 30, 32, 34, 32, 34, 36, 35, 38] },
    { x: 'Testing', y: [22, 33, 23, 25, 26, 28, 29, 30, 34, 33, 32, 31, 50] },
    { x: 'HR', y: [22, 24, 25, 30, 32, 34, 36, 38, 39, 41, 35, 36, 40, 56] },
    { x: 'Finance', y: [26, 27, 28, 30, 32, 34, 35, 37, 35, 37, 45] },
    { x: 'R&D', y: [26, 27, 29, 32, 34, 35, 36, 37, 38, 39, 41, 43, 58] },
    { x: 'Sales', y: [27, 26, 28, 29, 29, 29, 32, 35, 32, 38, 53] },
    { x: 'Inventory', y: [21, 23, 24, 25, 26, 27, 28, 30, 34, 36, 38] },
    { x: 'Graphics', y: [26, 28, 29, 30, 32, 33, 35, 36, 52] },
    { x: 'Training', y: [28, 29, 30, 31, 32, 34, 35, 36] }
];
var chart = new ej.charts.Chart({
    //Initializing Primary X Axis
    primaryXAxis: {
        valueType: 'Category'
    },
    //Initializing Chart Series
    series: [
        {
            type: 'BoxAndWhisker',
            dataSource: chartData,
            xName: 'x',
            yName: 'y',
            marker: {
                visible: true,
                width: 10,
                height: 10
            }
        }
    ]
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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://cdn.syncfusion.com/ej2/34.1.29/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>

Series customization

The following properties can be used to customize the box and whisker series.

Fill

The fill property determines the color applied to the series.

index.js
index.html
var chartData = [
    { x: 'Development', y: [22, 22, 23, 25, 25, 25, 26, 27, 27, 28, 28, 29, 30, 32, 34, 32, 34, 36, 35, 38] },
    { x: 'Testing', y: [22, 33, 23, 25, 26, 28, 29, 30, 34, 33, 32, 31, 50] },
    { x: 'HR', y: [22, 24, 25, 30, 32, 34, 36, 38, 39, 41, 35, 36, 40, 56] },
    { x: 'Finance', y: [26, 27, 28, 30, 32, 34, 35, 37, 35, 37, 45] },
    { x: 'R&D', y: [26, 27, 29, 32, 34, 35, 36, 37, 38, 39, 41, 43, 58] },
    { x: 'Sales', y: [27, 26, 28, 29, 29, 29, 32, 35, 32, 38, 53] },
    { x: 'Inventory', y: [21, 23, 24, 25, 26, 27, 28, 30, 34, 36, 38] },
    { x: 'Graphics', y: [26, 28, 29, 30, 32, 33, 35, 36, 52] },
    { x: 'Training', y: [28, 29, 30, 31, 32, 34, 35, 36] }
];
var chart = new ej.charts.Chart({
    //Initializing Primary X Axis
    primaryXAxis: {
        valueType: 'Category'
    },
    //Initializing Chart Series
    series: [
        {
            type: 'BoxAndWhisker',
            dataSource: chartData,
            xName: 'x',
            yName: 'y',
            marker: {
                visible: true,
                width: 10,
                height: 10
            },
            fill: '#1E90FF'
        }
    ]
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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://cdn.syncfusion.com/ej2/34.1.29/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>

The fill property can be used to apply a gradient color to the box and whisker series. By configuring this property with gradient values, you can create a visually appealing effect in which the color transitions smoothly from one shade to another.

index.js
index.html
var chartData = [
    { x: 'Development', y: [22, 22, 23, 25, 25, 25, 26, 27, 27, 28, 28, 29, 30, 32, 34, 32, 34, 36, 35, 38] },
    { x: 'Testing', y: [22, 33, 23, 25, 26, 28, 29, 30, 34, 33, 32, 31, 50] },
    { x: 'HR', y: [22, 24, 25, 30, 32, 34, 36, 38, 39, 41, 35, 36, 40, 56] },
    { x: 'Finance', y: [26, 27, 28, 30, 32, 34, 35, 37, 35, 37, 45] },
    { x: 'R&D', y: [26, 27, 29, 32, 34, 35, 36, 37, 38, 39, 41, 43, 58] },
    { x: 'Sales', y: [27, 26, 28, 29, 29, 29, 32, 35, 32, 38, 53] },
    { x: 'Inventory', y: [21, 23, 24, 25, 26, 27, 28, 30, 34, 36, 38] },
    { x: 'Graphics', y: [26, 28, 29, 30, 32, 33, 35, 36, 52] },
    { x: 'Training', y: [28, 29, 30, 31, 32, 34, 35, 36] }
];
var chart = new ej.charts.Chart({
    //Initializing Primary X Axis
    primaryXAxis: {
        valueType: 'Category'
    },
    //Initializing Chart Series
    series: [
        {
            type: 'BoxAndWhisker',
            dataSource: chartData,
            xName: 'x',
            yName: 'y',
            marker: {
                visible: true,
                width: 10,
                height: 10
            },
            fill: 'url(#gradient)'
        }
    ]
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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://cdn.syncfusion.com/ej2/34.1.29/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></div>
    </div>
    <svg style="width:1px; height:1px">
        <defs>
            <linearGradient id="gradient">
                <stop offset="0%" style="stop-color:blue;stop-opacity:5" />
                <stop offset="50%" style="stop-color:violet;stop-opacity:5" />
            </linearGradient>
        </defs>
    </svg>
    <script>
        var ele = document.getElementById('container');
        if (ele) {
            ele.style.visibility = "visible";
        }   
    </script>
    <script src="index.js" type="text/javascript"></script>
</body>

</html>

Opacity

The opacity property controls the transparency of the fill and affects how the series blends with background or overlapping series.

index.js
index.html
var chartData = [
    { x: 'Development', y: [22, 22, 23, 25, 25, 25, 26, 27, 27, 28, 28, 29, 30, 32, 34, 32, 34, 36, 35, 38] },
    { x: 'Testing', y: [22, 33, 23, 25, 26, 28, 29, 30, 34, 33, 32, 31, 50] },
    { x: 'HR', y: [22, 24, 25, 30, 32, 34, 36, 38, 39, 41, 35, 36, 40, 56] },
    { x: 'Finance', y: [26, 27, 28, 30, 32, 34, 35, 37, 35, 37, 45] },
    { x: 'R&D', y: [26, 27, 29, 32, 34, 35, 36, 37, 38, 39, 41, 43, 58] },
    { x: 'Sales', y: [27, 26, 28, 29, 29, 29, 32, 35, 32, 38, 53] },
    { x: 'Inventory', y: [21, 23, 24, 25, 26, 27, 28, 30, 34, 36, 38] },
    { x: 'Graphics', y: [26, 28, 29, 30, 32, 33, 35, 36, 52] },
    { x: 'Training', y: [28, 29, 30, 31, 32, 34, 35, 36] }
];
var chart = new ej.charts.Chart({
    //Initializing Primary X Axis
    primaryXAxis: {
        valueType: 'Category'
    },
    //Initializing Chart Series
    series: [
        {
            type: 'BoxAndWhisker',
            dataSource: chartData,
            xName: 'x',
            yName: 'y',
            marker: {
                visible: true,
                width: 10,
                height: 10
            },
            opacity: 0.5
        }
    ]
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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://cdn.syncfusion.com/ej2/34.1.29/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>

Border

Use the border property to configure the border width, color, and dasharray of the box and whisker series.

index.js
index.html
var chartData = [
    { x: 'Development', y: [22, 22, 23, 25, 25, 25, 26, 27, 27, 28, 28, 29, 30, 32, 34, 32, 34, 36, 35, 38] },
    { x: 'Testing', y: [22, 33, 23, 25, 26, 28, 29, 30, 34, 33, 32, 31, 50] },
    { x: 'HR', y: [22, 24, 25, 30, 32, 34, 36, 38, 39, 41, 35, 36, 40, 56] },
    { x: 'Finance', y: [26, 27, 28, 30, 32, 34, 35, 37, 35, 37, 45] },
    { x: 'R&D', y: [26, 27, 29, 32, 34, 35, 36, 37, 38, 39, 41, 43, 58] },
    { x: 'Sales', y: [27, 26, 28, 29, 29, 29, 32, 35, 32, 38, 53] },
    { x: 'Inventory', y: [21, 23, 24, 25, 26, 27, 28, 30, 34, 36, 38] },
    { x: 'Graphics', y: [26, 28, 29, 30, 32, 33, 35, 36, 52] },
    { x: 'Training', y: [28, 29, 30, 31, 32, 34, 35, 36] }
];
var chart = new ej.charts.Chart({
    //Initializing Primary X Axis
    primaryXAxis: {
        valueType: 'Category'
    },
    //Initializing Chart Series
    series: [
        {
            type: 'BoxAndWhisker',
            dataSource: chartData,
            xName: 'x',
            yName: 'y',
            marker: {
                visible: true,
                width: 10,
                height: 10
            },
            border: { width: 2, color: '#bd0032', dashArray: '2,2' }
        }
    ]
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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://cdn.syncfusion.com/ej2/34.1.29/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>

Box plot

To change the rendering mode of the box and whisker series, use the boxPlotMode property. The default value for boxPlotMode is Exclusive. The other available options for boxPlotMode are Inclusive and Normal.

index.js
index.html
var chartData = [
    { x: 'Development', y: [22, 22, 23, 25, 25, 25, 26, 27, 27, 28, 28, 29, 30, 32, 34, 32, 34, 36, 35, 38] },
    { x: 'Testing', y: [22, 33, 23, 25, 26, 28, 29, 30, 34, 33, 32, 31, 50] },
    { x: 'HR', y: [22, 24, 25, 30, 32, 34, 36, 38, 39, 41, 35, 36, 40, 56] },
    { x: 'Finance', y: [26, 27, 28, 30, 32, 34, 35, 37, 35, 37, 45] },
    { x: 'R&D', y: [26, 27, 29, 32, 34, 35, 36, 37, 38, 39, 41, 43, 58] },
    { x: 'Sales', y: [27, 26, 28, 29, 29, 29, 32, 35, 32, 38, 53] },
    { x: 'Inventory', y: [21, 23, 24, 25, 26, 27, 28, 30, 34, 36, 38] },
    { x: 'Graphics', y: [26, 28, 29, 30, 32, 33, 35, 36, 52] },
    { x: 'Training', y: [28, 29, 30, 31, 32, 34, 35, 36] }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        valueType: 'Category'
    },
    series: [
        {
            type: 'BoxAndWhisker',
            boxPlotMode: 'Normal',
            dataSource: chartData,
            xName: 'x',
            yName: 'y',
            marker: {
                visible: true,
                width: 10,
                height: 10
            }
        }
    ]
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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://cdn.syncfusion.com/ej2/34.1.29/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>

Show mean

In the box and whisker series, the showMean property is used to display the average value of the box and whisker. The default value of showMean is false.

index.js
index.html
var chartData = [
    { x: 'Development', y: [22, 22, 23, 25, 25, 25, 26, 27, 27, 28, 28, 29, 30, 32, 34, 32, 34, 36, 35, 38] },
    { x: 'Testing', y: [22, 33, 23, 25, 26, 28, 29, 30, 34, 33, 32, 31, 50] },
    { x: 'HR', y: [22, 24, 25, 30, 32, 34, 36, 38, 39, 41, 35, 36, 40, 56] },
    { x: 'Finance', y: [26, 27, 28, 30, 32, 34, 35, 37, 35, 37, 45] },
    { x: 'R&D', y: [26, 27, 29, 32, 34, 35, 36, 37, 38, 39, 41, 43, 58] },
    { x: 'Sales', y: [27, 26, 28, 29, 29, 29, 32, 35, 32, 38, 53] },
    { x: 'Inventory', y: [21, 23, 24, 25, 26, 27, 28, 30, 34, 36, 38] },
    { x: 'Graphics', y: [26, 28, 29, 30, 32, 33, 35, 36, 52] },
    { x: 'Training', y: [28, 29, 30, 31, 32, 34, 35, 36] }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        valueType: 'Category'
    },
    series: [
        {
            type: 'BoxAndWhisker',
            dataSource: chartData,
            showMean: false,
            xName: 'x',
            yName: 'y'
        }
    ]
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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://cdn.syncfusion.com/ej2/34.1.29/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>

Events

Series render

The seriesRender event enables modification of series properties (for example, data, fill, or name) immediately before rendering. Use this event to adjust series appearance or to dynamically swap data sources.

index.js
index.html
var chartData = [
    { x: 'Development', y: [22, 22, 23, 25, 25, 25, 26, 27, 27, 28, 28, 29, 30, 32, 34, 32, 34, 36, 35, 38] },
    { x: 'Testing', y: [22, 33, 23, 25, 26, 28, 29, 30, 34, 33, 32, 31, 50] },
    { x: 'HR', y: [22, 24, 25, 30, 32, 34, 36, 38, 39, 41, 35, 36, 40, 56] },
    { x: 'Finance', y: [26, 27, 28, 30, 32, 34, 35, 37, 35, 37, 45] },
    { x: 'R&D', y: [26, 27, 29, 32, 34, 35, 36, 37, 38, 39, 41, 43, 58] },
    { x: 'Sales', y: [27, 26, 28, 29, 29, 29, 32, 35, 32, 38, 53] },
    { x: 'Inventory', y: [21, 23, 24, 25, 26, 27, 28, 30, 34, 36, 38] },
    { x: 'Graphics', y: [26, 28, 29, 30, 32, 33, 35, 36, 52] },
    { x: 'Training', y: [28, 29, 30, 31, 32, 34, 35, 36] }
];
var chart = new ej.charts.Chart({
    //Initializing Primary X Axis
    primaryXAxis: {
        valueType: 'Category'
    },
    //Initializing Chart Series
    series: [
        {
            type: 'BoxAndWhisker',
            dataSource: chartData,
            xName: 'x',
            yName: 'y',
            marker: {
                visible: true,
                width: 10,
                height: 10
            }
        }
    ],
    seriesRender: function (args) {
        args.fill = '#ff6347';
    }
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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://cdn.syncfusion.com/ej2/34.1.29/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>

Point render

The pointRender event provides a hook to customize each data point (for example, marker shape, border, or fill) before it is drawn. Use this to apply per-point styling rules or conditional formatting.

index.js
index.html
var chartData = [
    { x: 'Development', y: [22, 22, 23, 25, 25, 25, 26, 27, 27, 28, 28, 29, 30, 32, 34, 32, 34, 36, 35, 38] },
    { x: 'Testing', y: [22, 33, 23, 25, 26, 28, 29, 30, 34, 33, 32, 31, 50] },
    { x: 'HR', y: [22, 24, 25, 30, 32, 34, 36, 38, 39, 41, 35, 36, 40, 56] },
    { x: 'Finance', y: [26, 27, 28, 30, 32, 34, 35, 37, 35, 37, 45] },
    { x: 'R&D', y: [26, 27, 29, 32, 34, 35, 36, 37, 38, 39, 41, 43, 58] },
    { x: 'Sales', y: [27, 26, 28, 29, 29, 29, 32, 35, 32, 38, 53] },
    { x: 'Inventory', y: [21, 23, 24, 25, 26, 27, 28, 30, 34, 36, 38] },
    { x: 'Graphics', y: [26, 28, 29, 30, 32, 33, 35, 36, 52] },
    { x: 'Training', y: [28, 29, 30, 31, 32, 34, 35, 36] }
];
var chart = new ej.charts.Chart({
    //Initializing Primary X Axis
    primaryXAxis: {
        valueType: 'Category'
    },
    //Initializing Chart Series
    series: [
        {
            type: 'BoxAndWhisker',
            dataSource: chartData,
            xName: 'x',
            yName: 'y',
            marker: {
                visible: true,
                width: 10,
                height: 10
            }
        }
    ],
    pointRender: function (args) {
        if (args.point.maximum < 38) {
            args.fill = '#ff6347';
        } else {
            args.fill = '#009cb8';
        }
    }
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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://cdn.syncfusion.com/ej2/34.1.29/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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