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    Update Circular Gauge Data at Runtime

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    This demo illustrates how to bind an array of subvalues to the CircularGauge. Since an array can not be bound to a field as a regular value, it is bound as a computed one.

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    window.onload = function () { const model = { items: dataSource, selected: ko.observable(dataSource[0]), value: ko.computed(() => model.selected().mean, null, { deferEvaluation: true }), subvalues: ko.computed(() => [ model.selected().min, model.selected().max, ], null, { deferEvaluation: true }), }; ko.applyBindings(model, $('#gauge-demo').get(0)); };
    <!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/22.2.3/css/dx.light.css" /> <script src="https://cdn3.devexpress.com/jslib/22.2.3/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="gauge-demo"> <div id="gauge" data-bind="dxCircularGauge: { scale: { startValue: 10, endValue: 40, tickInterval: 5, label: { customizeText: function (arg) { return arg.valueText + ' °C'; } } }, rangeContainer: { ranges: [ { startValue: 10, endValue: 20, color: '#0077BE' }, { startValue: 20, endValue: 30, color: '#E6E200' }, { startValue: 30, endValue: 40, color: '#77DD77' } ] }, tooltip: { enabled: true }, title: { text: 'Temperature in the Greenhouse', font: { size: 28 } }, value : value, subvalues : subvalues }"></div> <div id="seasons" data-bind="dxSelectBox: { width: 150, dataSource: items, displayExpr: 'name', value: selected }"></div> </div> </div> </body> </html>
    #gauge-demo { height: 440px; width: 100%; } #gauge { width: 80%; height: 100%; float: left; } #seasons { width: 20%; float: left; text-align: left; margin-top: 20px; }
    const dataSource = [{ name: 'Summer', mean: 35, min: 28, max: 38, }, { name: 'Autumn', mean: 24, min: 20, max: 32, }, { name: 'Winter', mean: 18, min: 16, max: 23, }, { name: 'Spring', mean: 27, min: 18, max: 31, }];