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    Bar Charts

    Customize Points and Labels

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    This demo shows how you can customize individual points and labels in the Chart.

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    window.onload = function () { const highAverage = 77; const lowAverage = 58; const viewModel = { chartOptions: { dataSource, customizePoint() { if (this.value > highAverage) { return { color: '#ff7c7c', hoverStyle: { color: '#ff7c7c' } }; } if (this.value < lowAverage) { return { color: '#8c8cff', hoverStyle: { color: '#8c8cff' } }; } return null; }, customizeLabel() { if (this.value > highAverage) { return { visible: true, backgroundColor: '#ff7c7c', customizeText() { return `${this.valueText}&#176F`; }, }; } return null; }, export: { enabled: true, }, valueAxis: { visualRange: { startValue: 40, }, maxValueMargin: 0.01, label: { customizeText() { return `${this.valueText}&#176F`; }, }, constantLines: [{ label: { text: 'Low Average', }, width: 2, value: lowAverage, color: '#8c8cff', dashStyle: 'dash', }, { label: { text: 'High Average', }, width: 2, value: highAverage, color: '#ff7c7c', dashStyle: 'dash', }], }, series: [{ argumentField: 'day', valueField: 'temperature', type: 'bar', color: '#e7d19a', }], title: { text: 'Daily Temperature in May', }, legend: { visible: false, }, }, }; ko.applyBindings(viewModel, document.getElementById('chart-demo')); };
    <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" /> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script> <script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.1.3/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.1.3/css/dx.light.css" /> <script src="https://cdn3.devexpress.com/jslib/22.1.3/js/dx.all.js"></script> <script src="data.js"></script> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="index.js"></script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="chart-demo"> <div id="chart" data-bind="dxChart: chartOptions"></div> </div> </div> </body> </html>
    #chart { height: 440px; }
    const dataSource = [{ day: '1', temperature: 57, }, { day: '2', temperature: 58, }, { day: '3', temperature: 57, }, { day: '4', temperature: 59, }, { day: '5', temperature: 63, }, { day: '6', temperature: 63, }, { day: '7', temperature: 63, }, { day: '8', temperature: 64, }, { day: '9', temperature: 64, }, { day: '10', temperature: 64, }, { day: '11', temperature: 69, }, { day: '12', temperature: 72, }, { day: '13', temperature: 75, }, { day: '14', temperature: 78, }, { day: '15', temperature: 76, }, { day: '16', temperature: 70, }, { day: '17', temperature: 65, }, { day: '18', temperature: 65, }, { day: '19', temperature: 68, }, { day: '20', temperature: 70, }, { day: '21', temperature: 73, }, { day: '22', temperature: 73, }, { day: '23', temperature: 75, }, { day: '24', temperature: 78, }, { day: '25', temperature: 76, }, { day: '26', temperature: 76, }, { day: '27', temperature: 80, }, { day: '28', temperature: 76, }, { day: '29', temperature: 75, }, { day: '30', temperature: 75, }, { day: '31', temperature: 74, }];