Getting started with Flutter Range Selector (SfRangeSelector)

25 Aug 202124 minutes to read

This section explains the steps required to add the range selector widget and its elements such as numeric and date values, ticks, labels and tooltips. This section covers only basic features needed to know to get started with Syncfusion range selector.

To get start quickly with our Flutter Range Selector widget, you can check on this video.

Add Flutter range selector to an application

Create a simple project using the instructions given in the Getting Started with your first Flutter app documentation.

Add dependency

Add the Syncfusion Flutter range selector dependency to your pubspec.yaml file.

  • dart
  • dependencies:
    
    syncfusion_flutter_sliders: ^xx.x.xx

    NOTE

    Here xx.x.xx denotes the current version of Syncfusion Flutter Sliders package.

    Get packages

    Run the following command to get the required packages.

  • dart
  • $ flutter pub get

    Import package

    Import the following package in your Dart code.

    import 'package:syncfusion_flutter_sliders/sliders.dart';

    Initialize range selector

    After importing the package, initialize the range selector widget as a child of any widget. Here, the range selector widget is added as a child of the Container widget. The default value of the min and max properties of the SfRangeSelector is 0.0 and 1.0 respectively. So, the initialValues property must be given within the range. You can add any kind of widget as a child of range selector. Here, Chart widget is added as a child.

    IMPORTANT

    You need to set the controller property to update range selector thumb values dynamically. Refer this link for setting controller property. The initialValues property can be used to set values at load time.

    final SfRangeValues _initialValues = SfRangeValues(0.3, 0.7);
    
    final List<Data> _chartData = <Data>[
      Data(x: DateTime(2003, 01, 01), y: 3.4),
      Data(x: DateTime(2004, 01, 01), y: 2.8),
      Data(x: DateTime(2005, 01, 01), y: 1.6),
      Data(x: DateTime(2006, 01, 01), y: 2.3),
      Data(x: DateTime(2007, 01, 01), y: 2.5),
      Data(x: DateTime(2008, 01, 01), y: 2.9),
      Data(x: DateTime(2009, 01, 01), y: 3.8),
      Data(x: DateTime(2010, 01, 01), y: 2.0),
    ];
    
    @override
    Widget build(BuildContext context) {
      return Container(
          child: Center(
            child: SfRangeSelector(
              initialValues: _initialValues,
              child: Container(
                child: SfCartesianChart(
                  margin: const EdgeInsets.all(0),
                  primaryXAxis: DateTimeAxis(
                    isVisible: false,),
                  primaryYAxis: NumericAxis(isVisible: false, maximum: 4),
                  series: <SplineAreaSeries<Data, DateTime>>[
                    SplineAreaSeries<Data, DateTime>(
                        dataSource: _chartData,
                        xValueMapper: (Data sales, int index) => sales.x,
                        yValueMapper: (Data sales, int index) => sales.y)
                  ],
                ),
                height: 250,
              ),
            ),
          ),
      );
    }
    
    class Data {
      Data({required this.x, required this.y});
      final DateTime x;
      final double y;
    }

    Default range selector

    Handle range change

    The onChanged callback is called when the user is selecting the new values.

    IMPORTANT

    You need to set the controller property to update range selector thumb values dynamically. Refer this link for setting controller property. The initialValues property can be used to set values at load time.

    final SfRangeValues _initialValues = SfRangeValues(0.3, 0.7);
    
    final List<Data> _chartData = <Data>[
      Data(x: DateTime(2003, 01, 01), y: 3.4),
      Data(x: DateTime(2004, 01, 01), y: 2.8),
      Data(x: DateTime(2005, 01, 01), y: 1.6),
      Data(x: DateTime(2006, 01, 01), y: 2.3),
      Data(x: DateTime(2007, 01, 01), y: 2.5),
      Data(x: DateTime(2008, 01, 01), y: 2.9),
      Data(x: DateTime(2009, 01, 01), y: 3.8),
      Data(x: DateTime(2010, 01, 01), y: 2.0),
    ];
    
    @override
    Widget build(BuildContext context) {
      return Container(
          child: Center(
            child: SfRangeSelector(
              initialValues: _initialValues,
              onChanged: (SfRangeValues values) {
              },
              child: Container(
                child: SfCartesianChart(
                  margin: const EdgeInsets.all(0),
                  primaryXAxis: DateTimeAxis(
                    isVisible: false,),
                  primaryYAxis: NumericAxis(isVisible: false, maximum: 4),
                  series: <SplineAreaSeries<Data, DateTime>>[
                    SplineAreaSeries<Data, DateTime>(
                        dataSource: _chartData,
                        xValueMapper: (Data sales, int index) => sales.x,
                        yValueMapper: (Data sales, int index) => sales.y)
                  ],
                ),
                height: 250,
              ),
            ),
          ),
      );
    }
    
    class Data {
      Data({required this.x, required this.y});
      final DateTime x;
      final double y;
    }

    Set numeric range

    You can show numeric values in the range selector by setting double values to the min, max and initialValues properties.

    IMPORTANT

    You need to set the controller property to update range selector thumb values dynamically. Refer this link for setting controller property. The initialValues property can be used to set values at load time.

    final double _min = 2.0;
    final double _max = 10.0;
    SfRangeValues _initialValues = SfRangeValues(4.0, 8.0);
    
    final List<Data> _chartData = <Data>[
        Data(x:2.0, y: 2.2),
        Data(x:3.0, y: 3.4),
        Data(x:4.0, y: 2.8),
        Data(x:5.0, y: 1.6),
        Data(x:6.0, y: 2.3),
        Data(x:7.0, y: 2.5),
        Data(x:8.0, y: 2.9),
        Data(x:9.0, y: 3.8),
        Data(x:10.0, y: 3.7),
    ];
    
    @override
    Widget build(BuildContext context) {
      return Container(
          child: Center(
            child: SfRangeSelector(
              min: _min,
              max: _max,
              initialValues: _initialValues,
              interval: 2,
              showLabels: true,
              child: Container(
                 child: SfCartesianChart(
                      margin: const EdgeInsets.all(0),
                      primaryXAxis: NumericAxis(
                           isVisible: false,),
                      primaryYAxis: NumericAxis(isVisible: false, maximum: 4),
                      series: <SplineAreaSeries<Data, double>>[
                            SplineAreaSeries<Data, double>(
                                 dataSource: _chartData,
                                 xValueMapper: (Data sales, int index) => sales.x,
                                 yValueMapper: (Data sales, int index) => sales.y)
                            ],
                      ),
                 height: 250,
              ),
            ),
          ),
      );
    }
    
    class Data {
      Data({required this.x, required this.y});
      final double x;
      final double y;
    }

    Numeric range selector

    Set date range

    You can show date values in the range selector by setting DateTime values to the min, max and initialValues properties.

    NOTE

    You must import intl package for formatting date range selector using the DateFormat class.

    IMPORTANT

    You need to set the controller property to update range selector thumb values dynamically. Refer this link for setting controller property. The initialValues property can be used to set values at load time.

    final DateTime _min = DateTime(2002, 01, 01);
    final DateTime _max = DateTime(2010, 01, 01);
    SfRangeValues _values = SfRangeValues(DateTime(2004, 01, 01), DateTime(2008, 01, 01));
    
    final List<Data> _chartData = <Data>[
        Data(x: DateTime(2002, 01, 01), y: 2.2),
        Data(x: DateTime(2003, 01, 01), y: 3.4),
        Data(x: DateTime(2004, 01, 01), y: 2.8),
        Data(x: DateTime(2005, 01, 01), y: 1.6),
        Data(x: DateTime(2006, 01, 01), y: 2.3),
        Data(x: DateTime(2007, 01, 01), y: 2.5),
        Data(x: DateTime(2008, 01, 01), y: 2.9),
        Data(x: DateTime(2009, 01, 01), y: 3.8),
        Data(x: DateTime(2010, 01, 01), y: 3.7),
    ];
    
    @override
    Widget build(BuildContext context) {
      return Container(
          child: Center(
            child: SfRangeSelector(
             min: _min,
             max: _max,
             showLabels: true,
             interval: 2,
             dateFormat: DateFormat.y(),
             dateIntervalType: DateIntervalType.years,
             initialValues: _values,
             child: Container(
                 height: 130,
                 child: SfCartesianChart(
                      margin: const EdgeInsets.all(0),
                      primaryXAxis: DateTimeAxis(
                          minimum: _min,
                          maximum: _max,
                          isVisible: false),
                      primaryYAxis: NumericAxis(isVisible: false),
                      plotAreaBorderWidth: 0,
                      series: <SplineAreaSeries<Data, DateTime>>[
                            SplineAreaSeries<Data, DateTime>(
                                 color: Color.fromARGB(255, 126, 184, 253),
                                 dataSource: _chartData,
                                       xValueMapper: (Data sales, int index) => sales.x,
                                       yValueMapper: (Data sales, int index) => sales.y)
                                 ],
                            ),
                      ),
                 ),
             ),
        );
    }
    
    class Data {
      Data({required this.x, required this.y});
      final DateTime x;
      final double y;
    }

    Date time range selector

    Enable ticks

    You can enable ticks in the range selector using the showTicks property.

    IMPORTANT

    You need to set the controller property to update range selector thumb values dynamically. Refer this link for setting controller property. The initialValues property can be used to set values at load time.

    final double _min = 2.0;
    final double _max = 10.0;
    SfRangeValues _initialValues = SfRangeValues(4.0, 8.0);
    
    final List<Data> _chartData = <Data>[
        Data(x:2.0, y: 2.2),
        Data(x:3.0, y: 3.4),
        Data(x:4.0, y: 2.8),
        Data(x:5.0, y: 1.6),
        Data(x:6.0, y: 2.3),
        Data(x:7.0, y: 2.5),
        Data(x:8.0, y: 2.9),
        Data(x:9.0, y: 3.8),
        Data(x:10.0, y: 3.7),
    ];
    
    @override
    Widget build(BuildContext context) {
      return Container(
          child: Center(
            child: SfRangeSelector(
              min: _min,
              max: _max,
              initialValues: _initialValues,
              interval: 1,
              showLabels: true,
              showTicks: true,
              child: Container(
                 child: SfCartesianChart(
                      margin: const EdgeInsets.all(0),
                      primaryXAxis: NumericAxis(
                           isVisible: false,),
                      primaryYAxis: NumericAxis(isVisible: false, maximum: 4),
                      series: <SplineAreaSeries<Data, double>>[
                            SplineAreaSeries<Data, double>(
                                 dataSource: _chartData,
                                 xValueMapper: (Data sales, int index) => sales.x,
                                 yValueMapper: (Data sales, int index) => sales.y)
                            ],
                      ),
                 height: 250,
              ),
            ),
          ),
      );
    }
    
    class Data {
      Data({required this.x, required this.y});
      final double x;
      final double y;
    }

    Show ticks in range selector

    Add prefix/suffix to labels

    You can add prefix or suffix to the labels using the numberFormat or dateFormat properties.

    NOTE

    The format type (numeric or date) of the range selector is determined based on the values specified in min, max and initialValues properties.

    IMPORTANT

    You must import intl package for formatting date range selector using the DateFormat class and for formatting numeric range selector using the NumberFormat class.

    final double _min = 2.0;
    final double _max = 10.0;
    SfRangeValues _initialValues = SfRangeValues(4.5, 8.5);
    
    final List<Data> _chartData = <Data>[
        Data(x:2.0, y: 2.2),
        Data(x:3.0, y: 3.4),
        Data(x:4.0, y: 2.8),
        Data(x:5.0, y: 1.6),
        Data(x:6.0, y: 2.3),
        Data(x:7.0, y: 2.5),
        Data(x:8.0, y: 2.9),
        Data(x:9.0, y: 3.8),
        Data(x:10.0, y: 3.7),
    ];
    
    @override
    Widget build(BuildContext context) {
      return Container(
          child: Center(
            child: SfRangeSelector(
              min: _min,
              max: _max,
              initialValues: _initialValues,
              interval: 1,
              showLabels: true,
              showTicks: true,
              numberFormat: NumberFormat("\$"),
              child: Container(
                 height: 130,
                 child: SfCartesianChart(
                      margin: const EdgeInsets.all(0),
                      primaryXAxis: NumericAxis(
                        isVisible: false,
                        minimum: _min,
                        maximum: _max,
                      ),
                      primaryYAxis: NumericAxis(isVisible: false, maximum: 4),
                      plotAreaBorderWidth: 0,
                      plotAreaBackgroundColor: Colors.transparent,
                      series: <ColumnSeries<Data, double>>[
                            ColumnSeries<Data, double>(
                                 dataSource: _chartData,
                                 color: Color.fromARGB(255, 126, 184, 253),
                                 xValueMapper: (Data sales, int index) => sales.x,
                                 yValueMapper: (Data sales, int index) => sales.y)
                            ],
                      ),
                ),
            ),
          ),
      );
    }
    
    class Data {
      Data({required this.x, required this.y});
      final double x;
      final double y;
    }

    Format labels in range selector