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Selection

Chart provides selection support for the series and its data points on mouse click.

When Mouse is clicked on the data points, the corresponding series legend will also be selected.

We have different type of selection mode for selecting the data. They are,

  • None
  • Point
  • Series
  • Cluster
  • DragXY
  • DragX
  • DragY

Point

You can select a point, by setting selectionMode to point.

Source
Preview
app.vue
<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis' selectionMode='Point'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='gold' name='Gold'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='silver' name='Silver'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='bronze' name='Bronze'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, ColumnSeries, Category, Legend, Selection  } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
                { country: "USA", gold: 50, silver: 70, bronze: 45 },
                { country: "China", gold: 40, silver: 60, bronze: 55 },
                { country: "Japan", gold: 70, silver: 60, bronze: 50 },
                { country: "Australia", gold: 60, silver: 56, bronze: 40 },
                { country: "France", gold: 50, silver: 45, bronze: 35 },
                { country: "Germany", gold: 40, silver: 30, bronze: 22 },
                { country: "Italy", gold: 40, silver: 35, bronze: 37 },
                { country: "Sweden", gold: 30, silver: 25, bronze: 27 }
              ],
        primaryXAxis: {
           valueType: 'Category',
           title: 'Countries'
        },
      title: "Olympic Medals"
    };
  },
  provide: {
    chart: [ColumnSeries, Category, Legend, Selection  ]
  }
};
</script>
<style>
  #container {
   height: 350px;
 }
</style>

Note: To use select feature, we need to Inject Selection into the provide.

Series

You can select a series, by setting selectionMode to series.

Source
Preview
app.vue
<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis' selectionMode='Series'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='gold' name='Gold'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='silver' name='Silver'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='bronze' name='Bronze'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, ColumnSeries, Category, Legend, Selection } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
                { country: "USA", gold: 50, silver: 70, bronze: 45 },
                { country: "China", gold: 40, silver: 60, bronze: 55 },
                { country: "Japan", gold: 70, silver: 60, bronze: 50 },
                { country: "Australia", gold: 60, silver: 56, bronze: 40 },
                { country: "France", gold: 50, silver: 45, bronze: 35 },
                { country: "Germany", gold: 40, silver: 30, bronze: 22 },
                { country: "Italy", gold: 40, silver: 35, bronze: 37 },
                { country: "Sweden", gold: 30, silver: 25, bronze: 27 }
              ],
        primaryXAxis: {
           valueType: 'Category',
           title: 'Countries'
        },
      title: "Olympic Medals"
    };
  },
  provide: {
    chart: [ColumnSeries, Category, Legend, Selection]
  }
};
</script>
<style>
 #container {
   height: 350px;
 }
</style>

Cluster

You can select the points that corresponds to the same index in all the series, by setting selectionMode to cluster.

Source
Preview
app.vue
<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis' selectionMode='Cluster'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='gold' name='Gold'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='silver' name='Silver'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='bronze' name='Bronze'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, ColumnSeries, Category, Legend, Selection } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
                { country: "USA", gold: 50, silver: 70, bronze: 45 },
                { country: "China", gold: 40, silver: 60, bronze: 55 },
                { country: "Japan", gold: 70, silver: 60, bronze: 50 },
                { country: "Australia", gold: 60, silver: 56, bronze: 40 },
                { country: "France", gold: 50, silver: 45, bronze: 35 },
                { country: "Germany", gold: 40, silver: 30, bronze: 22 },
                { country: "Italy", gold: 40, silver: 35, bronze: 37 },
                { country: "Sweden", gold: 30, silver: 25, bronze: 27 }
              ],
        primaryXAxis: {
           valueType: 'Category',
           title: 'Countries'
        },
      title: "Olympic Medals"
    };
  },
  provide: {
    chart: [ColumnSeries, Category, Legend, Selection]
  }
};
</script>
<style>
  #container {
   height: 350px;
 }
</style>

Rectangular selection

DragXY, DragX and DragY

To fetch the collection of data under a particular region, you have to set selectionMode as DragXY.

  • DragXY - Allows us to select data with respect to horizontal and vertical axis.
  • DragX - Allows us to select data with respect to horizontal axis.
  • DragY - Allows us to select data with respect to vertical axis.

The selected data’s are returned as an array collection in the dragComplete event.

Source
Preview
app.vue
<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis' :primaryYAxis='primaryYAxis' selectionMode='DragXY'>
            <e-series-collection>
                <e-series :dataSource='seriesData1' type='Scatter' xName='x' yName='y' name='Male' opacity=0.7> </e-series>
                <e-series :dataSource='seriesData2' type='Scatter' xName='x' yName='y' name='Female' opacity=0.7> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, ScatterSeries, Legend, Selection } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

let series1: Object[] = [];
let series2: Object[] = [];
let point1: Object;
let value: number = 80;
let value1: number = 70;
let i: number;
for (i = 1; i < 50; i++) {
    if (Math.random() > 0.5) {
        value += Math.random();
    } else {
        value -= Math.random();
    }
    value = value < 60 ? 60 : value > 90 ? 90 : value;
    point1 = { x: 120 + (i / 2), y: value.toFixed(1) };
    series1.push(point1);
}
for (i = 1; i < 50; i++) {
    if (Math.random() > 0.5) {
        value1 += Math.random();
    } else {
        value1 -= Math.random();
    }
    value1 = value1 < 60 ? 60 : value1 > 90 ? 90 : value1;
    point1 = { x: 120 + (i / 2), y: value1.toFixed(1) };
    series2.push(point1);
}

export default {
  data() {
    return {
      seriesData1: series1,
      seriesData2: series2,
      primaryXAxis: {
            title: 'Height (cm)',
            minimum: 120, maximum: 180,
            edgeLabelPlacement: 'Shift',
            labelFormat: '{value}cm'
        },
        primaryYAxis: {
            title: 'Weight (kg)',
            minimum: 60, maximum: 90,
            labelFormat: '{value}kg',
            rangePadding: 'None'
        },
        title: 'Height Vs Weight'
    };
  },
  provide: {
    chart: [ScatterSeries, Legend, Selection]
  },
};
</script>
<style>
  #container {
   height: 350px;
 }
</style>

Selection type

You can select multiple points or series, by enabling the isMultiSelect property.

Source
Preview
app.vue
<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis' selectionMode='Point' isMultiSelect='true'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='gold' name='Gold'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='silver' name='Silver'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='bronze' name='Bronze'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, ColumnSeries, Category, Legend, Selection } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
                { country: "USA", gold: 50, silver: 70, bronze: 45 },
                { country: "China", gold: 40, silver: 60, bronze: 55 },
                { country: "Japan", gold: 70, silver: 60, bronze: 50 },
                { country: "Australia", gold: 60, silver: 56, bronze: 40 },
                { country: "France", gold: 50, silver: 45, bronze: 35 },
                { country: "Germany", gold: 40, silver: 30, bronze: 22 },
                { country: "Italy", gold: 40, silver: 35, bronze: 37 },
                { country: "Sweden", gold: 30, silver: 25, bronze: 27 }
              ],
        primaryXAxis: {
           valueType: 'Category',
           title: 'Countries'
        },
      title: "Olympic Medals"
    };
  },
  provide: {
    chart: [ColumnSeries, Category, Legend, Selection]
  }
};
</script>
<style>
 #container {
   height: 350px;
 }
</style>

Selection on load

You can able to select a point or series programmatically on a chart using selectedDataIndexes property.

Source
Preview
app.vue
<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis'  selectionMode='Point' isMultiSelect='true' :selectedDataIndexes='selectedData'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='gold' name='Gold'  :animation='animation' selectionStyle='chartSelection1'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='silver' name='Silver' :animation='animation' selectionStyle='chartSelection1'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='bronze' name='Bronze' :animation='animation' selectionStyle='chartSelection1'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, ColumnSeries, Category, Legend, Selection } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
                { country: "USA", gold: 50, silver: 70, bronze: 45 },
                { country: "China", gold: 40, silver: 60, bronze: 55 },
                { country: "Japan", gold: 70, silver: 60, bronze: 50 },
                { country: "Australia", gold: 60, silver: 56, bronze: 40 },
                { country: "France", gold: 50, silver: 45, bronze: 35 },
                { country: "Germany", gold: 40, silver: 30, bronze: 22 },
                { country: "Italy", gold: 40, silver: 35, bronze: 37 },
                { country: "Sweden", gold: 30, silver: 25, bronze: 27 }
              ],
        primaryXAxis: {
           valueType: 'Category',
           title: 'Countries'
        },
        selectedData:[
        { series: 0, point: 1}, { series: 2, point: 3}
       ],
      animation:{ enable: false},
      title: "Olympic Medals"
    };
  },
  provide: {
    chart: [ColumnSeries, Category, Legend, Selection]
  }
};
</script>
<style>
 #container {
   height: 350px;
 }
  .chartSelection1 {
    fill: red
}

.chartSelection2 {

    fill: green

}

.chartSelection3 {
    fill: blue
}
</style>

Selection through on legend

You can able to select a point or series through on legend using toggleVisibility property.

Source
Preview
app.vue
<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis'  :legendSettings='legendSettings' selectionMode='Point'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='gold' name='Gold' :animation='animation'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='silver' name='Silver'  :animation='animation'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='bronze' name='Bronze' :animation='animation'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, ColumnSeries, Category, Legend, Selection } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
                { country: "USA", gold: 50, silver: 70, bronze: 45 },
                { country: "China", gold: 40, silver: 60, bronze: 55 },
                { country: "Japan", gold: 70, silver: 60, bronze: 50 },
                { country: "Australia", gold: 60, silver: 56, bronze: 40 },
                { country: "France", gold: 50, silver: 45, bronze: 35 },
                { country: "Germany", gold: 40, silver: 30, bronze: 22 },
                { country: "Italy", gold: 40, silver: 35, bronze: 37 },
                { country: "Sweden", gold: 30, silver: 25, bronze: 27 }
              ],
        primaryXAxis: {
           valueType: 'Category',
           title: 'Countries'
        },
      animation: { enable: false },
      legendSettings: { visible: true, toggleVisibility: false }
      title: "Olympic Medals"
    };
  },
  provide: {
    chart: [ColumnSeries, Category, Legend, Selection]
  }
};
</script>
<style>
 #container {
   height: 350px;
 }
</style>

Customization for selection

You can apply custom style to selected points or series with selectionStyle property.

Source
Preview
app.vue
<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis'  selectionMode='Point' isMultiSelect='true'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='gold' name='Gold' selectionStyle='chartSelection1'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='silver' name='Silver' selectionStyle='chartSelection2'> </e-series>
                <e-series :dataSource='seriesData' type='Column' xName='country' yName='bronze' name='Bronze' selectionStyle='chartSelection3'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, ColumnSeries, Category, Legend, Selection } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
                { country: "USA", gold: 50, silver: 70, bronze: 45 },
                { country: "China", gold: 40, silver: 60, bronze: 55 },
                { country: "Japan", gold: 70, silver: 60, bronze: 50 },
                { country: "Australia", gold: 60, silver: 56, bronze: 40 },
                { country: "France", gold: 50, silver: 45, bronze: 35 },
                { country: "Germany", gold: 40, silver: 30, bronze: 22 },
                { country: "Italy", gold: 40, silver: 35, bronze: 37 },
                { country: "Sweden", gold: 30, silver: 25, bronze: 27 }
              ],
        primaryXAxis: {
           valueType: 'Category',
           title: 'Countries'
        },
      animation: { enable: false },
      legendSettings: { visible: true, toggleVisibility: false }
      title: "Olympic Medals"
    };
  },
  provide: {
    chart: [ColumnSeries, Category, Legend, Selection]
  }
};
</script>
<style>
 #container {
   height: 350px;
 }
 .chartSelection1 {
    fill: red
}

.chartSelection2 {

    fill: green

}

.chartSelection3 {
    fill: blue
}
</style>
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