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.
Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
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<template>
<DxChart
id="chart"
:data-source="dataSource"
title="Noisy and Original Signals"
@legend-click="onLegendClick"
>
<DxCommonSeriesSettings
argument-field="argument"
>
<DxPoint :visible="false"/>
</DxCommonSeriesSettings>
<DxSeries
value-field="originalValue"
name="Original Signal"
/>
<DxSeries
value-field="value"
name="Noisy Signal"
/>
<DxLegend
vertical-alignment="bottom"
horizontal-alignment="center"
marker-template="markerTemplate"
/>
<template #markerTemplate="{ data }">
<MarkerTemplate :item="data"/>
</template>
</DxChart>
</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 { createApp } from 'vue';
import App from './App.vue';
createApp(App).mount('#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/20.2.3/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.3/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',
meta: {
'*.vue': {
loader: 'vue-loader'
},
},
paths: {
'npm:': 'https://unpkg.com/'
},
map: {
'vue': 'npm:vue@3.0.0/dist/vue.esm-browser.js',
'vue-loader': 'npm:dx-systemjs-vue-browser@1.0.15/index.js',
'mitt': 'npm:mitt/dist/mitt.umd.js',
'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.25.0/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@20.2.3',
'devextreme-vue': 'npm:devextreme-vue@20.2.3',
'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@0.9.5/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.0.0/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@2.0.0/dist/dx-gantt.js',
'preact': 'npm:preact@10.5.5/dist/preact.js',
'preact/hooks': 'npm:preact@10.5.5/hooks/dist/hooks.js',
'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',
'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js'
},
packages: {
'devextreme-vue': {
main: 'index.js'
},
'devextreme': {
defaultExtension: 'js'
},
'devextreme/events/utils': {
main: 'index'
},
'devextreme/events': {
main: 'index'
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js'
}
},
babelOptions: {
sourceMaps: false,
stage0: true
}
});