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Dotted Line in Vue Chart component

By using annotation, you can add dotted lines in the chart.

To add dotted lines in the chart, follow the given steps:

Step 1:

Initialize the custom elements by using the annotation property.

By setting coordinateUnits value as point in annotation object you can placed dotted lines in the chart based on point x and y values.

Source
Preview
app.vue
<template>
    <div id="app">
         <ejs-chart id="container" :title='title' :primaryXAxis='primaryXAxis' :primaryYAxis='primaryYAxis'
          :annotations='annotations'>
            <e-series-collection>
                <e-series :dataSource='seriesData' type='Line' xName='country' yName='gold' name='Gold'> </e-series>
            </e-series-collection>
        </ejs-chart>
    </div>
</template>
<script>
import Vue from "vue";
import { ChartPlugin, LineSeries, Category, Selection, ChartAnnotation } from "@syncfusion/ej2-vue-charts";

Vue.use(ChartPlugin);

export default {
  data() {
    return {
      seriesData: [
             { country: "USA", gold: 50, silver: 60 },
             { country: "China", gold: 40, silver: 50 },
             { country: "Japan", gold: 70, silver: 80 },
             { country: "Australia", gold: 60, silver: 70 },
             { country: "France", gold: 50, silver: 60 },
             { country: "Germany", gold: 40, silver: 50 },
             { country: "Italy", gold: 40, silver: 50 },
             { country: "Sweden", gold: 30, silver: 70 }
              ],
        primaryXAxis: {
           valueType: 'Category',
           title: 'Countries'
        },
          primaryYAxis:
        {
            minimum: 0, maximum: 80,
            interval: 20, title: 'Medals'
        },
         annotations:[{
        content: '<div style="border-top:3px dashed grey;border-top-width: 2px; width: 1000px"></div>',
        coordinateUnits: 'Point',
        x: 'France',
        y: 50
        }],
      title: "Olympic Medals"
    };
  },
  provide: {
    chart: [LineSeries, Category, Selection, ChartAnnotation]
  },
   methods: {

  }
};
</script>
<style>
 #container {
   height: 350px;
 }
</style>