Gauges - Variable Number of Subvalue Indicators

This demo shows how to use the API of the LinearGauge to change its value and subvalue indicators at runtime. To get and set values of the indicators, the value and subvalues methods are utilized.

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Backend API

@model IEnumerable<DevExtreme.NETCore.Demos.Models.SubvalueIndicator> @{ var firstIndicator = Model.First(); } <div id="gauge-demo"> @(Html.DevExtreme().LinearGauge() .ID("gauge") .Scale(s => s .StartValue(0) .EndValue(10) .TickInterval(2) .Label(l => l.CustomizeText(@<text> function (arg) { return arg.valueText + " kW"; } </text>)) ) .Tooltip(t => t .Enabled(true) .CustomizeTooltip(@<text> function (arg) { var result = arg.valueText + " kW"; if(arg.index >= 0) { result = "Secondary " + (arg.index + 1) + ": " + result; } else { result = "Primary: " + result; } return { text: result }; } </text>) ) .Export(e => e.Enabled(true)) .Title(t => t .Text("Power of Air Conditioners in Store Departments (kW)") .Font(f => f.Size(28)) ) .Value(firstIndicator.Primary) .Subvalues(firstIndicator.Secondary) ) @(Html.DevExtreme().SelectBox() .ID("selectbox") .DataSource(Model, "Name") .InputAttr("aria-label", "Department") .DisplayExpr("Name") .Value("Meat") .OnValueChanged("selectBox_OnValueChanged") .Width(200) ) </div> <script> function selectBox_OnValueChanged(data) { var instance = $('#gauge').dxLinearGauge('instance'); instance.value(data.value.Primary); instance.subvalues(data.value.Secondary); } </script>

using DevExtreme.NETCore.Demos.Models.SampleData; using Microsoft.AspNetCore.Mvc; namespace DevExtreme.NETCore.Demos.Controllers { public class GaugesController : Controller { public ActionResult VariableNumberOfSubvalueIndicators() { return View(SampleData.SubvalueIndicators); } } }

using System; using System.Collections.Generic; namespace DevExtreme.NETCore.Demos.Models { public class SubvalueIndicator { public string Name { get; set; } public double Primary { get; set; } public IEnumerable<double> Secondary { get; set; } } }

using System; using System.Collections.Generic; namespace DevExtreme.NETCore.Demos.Models.SampleData { public partial class SampleData { public static readonly IEnumerable<SubvalueIndicator> SubvalueIndicators = new[] { new SubvalueIndicator { Name = "Meat", Primary = 8, Secondary = new double[] { 7, 3 } }, new SubvalueIndicator { Name = "Fish", Primary = 7, Secondary = new double[] { 7, 5, 1 } }, new SubvalueIndicator { Name = "Grocery", Primary = 5, Secondary = new double[] { 1, 3 } }, new SubvalueIndicator { Name = "Greengrocery", Primary = 3, Secondary = new double[] { 1 } }, new SubvalueIndicator { Name = "Stationery", Primary = 2, Secondary = new double[] { } } }; } }

#gauge-demo { height: 440px; width: 100%; } #gauge { height: 400px; }