Data markers in Vue Chart component

3 Mar 202322 minutes to read

Data markers are used to provide information about the data points in the series. You can add a shape to adorn
each data point.

Marker

Markers can be added to the points by enabling the visible
option of the marker property.

app.vue

<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Line' xName='x' yName='y' name='December 2007'
                :marker='marker'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, LineSeries, Category } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
              { x: 'WW', y: 12, y1: 22, y2: 38.3, y3: 50 },
              { x: 'EU', y: 9.9, y1: 26, y2: 45.2, y3: 63.6 },
              { x: 'APAC', y: 4.4, y1: 9.3, y2: 18.2, y3: 20.9 },
              { x: 'LATAM', y: 6.4, y1: 28, y2: 46.7, y3: 65.1 },
              { x: 'MEA', y: 30, y1: 45.7, y2: 61.5, y3: 73 },
              { x: 'NA', y: 25.3, y1: 35.9, y2: 64, y3: 81.4 }
              ],
        primaryXAxis: {
            valueType: 'Category', interval: 1
        },
       marker: {
            visible: true,
                },
      title: "FB Penetration of Internet Audience"
    };
  },
  provide: {
    chart: [LineSeries, Category]
  }
};
</script>
<style>
 #container {
   height: 350px;
 }
</style>

Shape

Markers can be assigned with different shapes such as Rectangle, Circle, Diamond etc using the shape property.

app.vue

<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Line' xName='x' yName='y' name='December 2007'
                :marker='marker'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, LineSeries, Category } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
              { x: 'WW', y: 12, y1: 22, y2: 38.3, y3: 50 },
              { x: 'EU', y: 9.9, y1: 26, y2: 45.2, y3: 63.6 },
              { x: 'APAC', y: 4.4, y1: 9.3, y2: 18.2, y3: 20.9 },
              { x: 'LATAM', y: 6.4, y1: 28, y2: 46.7, y3: 65.1 },
              { x: 'MEA', y: 30, y1: 45.7, y2: 61.5, y3: 73 },
              { x: 'NA', y: 25.3, y1: 35.9, y2: 64, y3: 81.4 }
              ],
        primaryXAxis: {
            valueType: 'Category', interval: 1
        },
       marker: {
           visible: true, width: 10, height: 10, shape: 'Diamond'
                },
      title: "FB Penetration of Internet Audience"
    };
  },
  provide: {
    chart: [LineSeries, Category]
  }
};
</script>
<style>
 #container {
   height: 350px;
 }
</style>

Note : To know more about the marker shape type refer the shape.

Images

Apart from the shapes, you can also add custom images to mark the data point using the
imageUrl property.

app.vue

<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Line' xName='x' yName='y' name='December 2007'
                :marker='marker'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, LineSeries, Category } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
              { x: 'WW', y: 12, y1: 22, y2: 38.3, y3: 50 },
              { x: 'EU', y: 9.9, y1: 26, y2: 45.2, y3: 63.6 },
              { x: 'APAC', y: 4.4, y1: 9.3, y2: 18.2, y3: 20.9 },
              { x: 'LATAM', y: 6.4, y1: 28, y2: 46.7, y3: 65.1 },
              { x: 'MEA', y: 30, y1: 45.7, y2: 61.5, y3: 73 },
              { x: 'NA', y: 25.3, y1: 35.9, y2: 64, y3: 81.4 }
              ],
        primaryXAxis: {
            valueType: 'Category', interval: 1
        },
       marker: {
           visible: true,
           width: 10, height: 10, shape: 'Image',
           imageUrl:'./sun_annotation.png'
                },
      title: "FB Penetration of Internet Audience"
    };
  },
  provide: {
    chart: [LineSeries, Category]
  }
};
</script>
<style>
 #container {
   height: 350px;
 }
</style>

Customization

Marker’s color and border can be customized using fill and border properties.

app.vue

<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Line' xName='x' yName='y' name='December 2007'
                :marker='marker'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, LineSeries, Category } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
              { x: 'WW', y: 12, y1: 22, y2: 38.3, y3: 50 },
              { x: 'EU', y: 9.9, y1: 26, y2: 45.2, y3: 63.6 },
              { x: 'APAC', y: 4.4, y1: 9.3, y2: 18.2, y3: 20.9 },
              { x: 'LATAM', y: 6.4, y1: 28, y2: 46.7, y3: 65.1 },
              { x: 'MEA', y: 30, y1: 45.7, y2: 61.5, y3: 73 },
              { x: 'NA', y: 25.3, y1: 35.9, y2: 64, y3: 81.4 }
              ],
        primaryXAxis: {
            valueType: 'Category', interval: 1
        },
       marker: { visible: true,  fill: 'Red', height: 10, width: 10,
                    border:{width: 2, color: 'blue'} },
      title: "FB Penetration of Internet Audience"
    };
  },
  provide: {
    chart: [LineSeries, Category]
  }
};
</script>
<style>
 #container {
   height: 350px;
 }
</style>

Customizing specific point

You can also customize the specific marker and label using pointRender event. The pointRender event allows you to change the shape, color and border for a point.

app.vue

<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis' :pointRender='pointRender'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Line' xName='x' yName='y' name='December 2007'
                :marker='marker'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, LineSeries, Category } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
              { x: 'WW', y: 12, y1: 22, y2: 38.3, y3: 50 },
              { x: 'EU', y: 9.9, y1: 26, y2: 45.2, y3: 63.6 },
              { x: 'APAC', y: 4.4, y1: 9.3, y2: 18.2, y3: 20.9 },
              { x: 'LATAM', y: 6.4, y1: 28, y2: 46.7, y3: 65.1 },
              { x: 'MEA', y: 30, y1: 45.7, y2: 61.5, y3: 73 },
              { x: 'NA', y: 25.3, y1: 35.9, y2: 64, y3: 81.4 }
              ],
        primaryXAxis: {
            valueType: 'Category', interval: 1
        },
       marker: { visible: true, height: 10, width: 10 },
      title: "FB Penetration of Internet Audience"
    };
  },
  provide: {
    chart: [LineSeries, Category]
  },
   methods: {
      pointRender: function(args) {
      if(args.point.index === 3) {
         args.fill = 'red'
        }
  }
   }
};
</script>
<style>
 #container {
   height: 350px;
 }
</style>

Fill marker with series color

Marker can be filled with the series color by setting the isFilled property to true.

app.vue

<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis' :pointRender='pointRender'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Line' xName='x' yName='y' name='December 2007'
                :marker='marker'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, LineSeries, Category } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
              { x: 'WW', y: 12, y1: 22, y2: 38.3, y3: 50 },
              { x: 'EU', y: 9.9, y1: 26, y2: 45.2, y3: 63.6 },
              { x: 'APAC', y: 4.4, y1: 9.3, y2: 18.2, y3: 20.9 },
              { x: 'LATAM', y: 6.4, y1: 28, y2: 46.7, y3: 65.1 },
              { x: 'MEA', y: 30, y1: 45.7, y2: 61.5, y3: 73 },
              { x: 'NA', y: 25.3, y1: 35.9, y2: 64, y3: 81.4 }
              ],
        primaryXAxis: {
            valueType: 'Category', interval: 1
        },
       marker: { visible: true, height: 10, width: 10 , isFilled: true},
      title: "FB Penetration of Internet Audience"
    };
  },
  provide: {
    chart: [LineSeries, Category]
  },
};
</script>
<style>
 #container {
   height: 350px;
 }
</style>