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Charts

Custom Legend Markers

Legend markers are SVG elements. To customize a legend marker, declare the SVG markup in the markerTemplate. You can access the legend item data object inside the template and use it to identify the series and read its parameters.

In this demo, the markers' appearance changes when you click the markers to show or hide the corresponding series.

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<template> <dx-chart id="chart" :data-source="dataSource" title="Noisy and Original Signals" @legend-click="onLegendClick" > <dx-common-series-settings argument-field="argument" > <dx-point :visible="false"/> </dx-common-series-settings> <dx-series value-field="originalValue" name="Original Signal" /> <dx-series value-field="value" name="Noisy Signal" /> <dx-legend vertical-alignment="bottom" horizontal-alignment="center" marker-template="markerTemplate" /> <template #markerTemplate="{ data }"> <marker-template :item="data"/> </template> </dx-chart> </template> <script> import { DxChart, DxSeries, DxCommonSeriesSettings, DxPoint, DxLegend } from 'devextreme-vue/chart'; import { dataSource } from './data.js'; import MarkerTemplate from './MarkerTemplate.vue'; export default { components: { DxChart, DxSeries, DxCommonSeriesSettings, DxPoint, DxLegend, MarkerTemplate }, data() { return { dataSource }; }, methods: { onLegendClick(e) { e.target.isVisible() ? e.target.hide() : e.target.show(); } } }; </script> <style> #chart { height: 440px; } </style>
<template> <svg> <rect :x="0" :y="0" :width="18" :height="18" :fill="color" :opacity="0.3" /> <path :d="d" :fill="color" /> </svg> </template> <script> const markerPath = { 'Original Signal': 'M 0 8 C 2 4 7 4 9.5 8 C 11 12 16 12 18 8 L 18 10 C 16 14 11 14 8.5 10 C 7 6 2 6 0 10 Z', 'Noisy Signal': 'M 18 8 L 12 12 L 7 3 L 0 7.4 L 0 10 L 6 6 L 11 15 L 18 10.6 Z' }; export default { props: { item: { type: Object, default: () => {} } }, data() { return { color: this.item.series.isVisible() ? this.item.marker.fill : '#888', d: markerPath[this.item.series.name] }; } }; </script>
import Vue from 'vue'; import App from './App.vue'; new Vue({ el: '#app', components: { App }, template: '<App/>' });
<!DOCTYPE html> <html> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import('./index.js'); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"> </div> </div> </body> </html>
function generateData(start, end, step) { const data = []; for (let i = start; i < end; i += step) { const originalValue = Math.sin(i) / i; data.push({ value: originalValue + ((0.5 - Math.random()) / 10), originalValue: originalValue, argument: i }); } return data; } export const dataSource = generateData(2.5, 12, 0.1);
System.config({ transpiler: 'plugin-babel', paths: { 'npm:': 'https://unpkg.com/' }, map: { vue: 'npm:vue@2.6.3/dist/vue.esm.browser.js', 'vue-loader': 'npm:dx-systemjs-vue-browser@latest/index.js', 'devextreme': 'npm:devextreme@19.2', 'devextreme-vue': 'npm:devextreme-vue@19.2', jszip: 'npm:jszip@3.1.3/dist/jszip.min.js', 'quill': 'npm:quill@1.3.7/dist/quill.js', 'devexpress-diagram': 'npm:devexpress-diagram', 'devexpress-gantt': 'npm:devexpress-gantt', 'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js' }, meta: { '*.vue': { loader: 'vue-loader' } }, packages: { 'devextreme-vue': { main: 'index.js' }, 'devextreme': { defaultExtension: 'js' } }, babelOptions: { sourceMaps: false, stage0: true } });