Line Markers (React)

The LineMarker class allows you to add a mouse-driven cursor to your charts. The cursor consists of a text element used to display information about the point under the mouse and optional lines to indicate the exact position of the mouse.

You can customize the appearance of the LineMarker using CSS, and its behavior using properties including content, interaction, and lines.

Learn about FlexChart | Line Markers Documentation | FlexChart API Reference

This example uses React.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useRef, useState } from 'react'; import useEvent from 'react-use-event-hook'; import * as wjCore from '@mescius/wijmo'; import * as wjChart from '@mescius/wijmo.react.chart'; import * as wjInput from '@mescius/wijmo.react.input'; import './app.css'; import { data } from './data'; function App() { const [lmVisible, setLmVisible] = useState(false); const [lines, setLines] = useState('Both'); const [interaction, setInteraction] = useState('Move'); const linesData = useRef(['None', 'Vertical', 'Horizontal', 'Both']); const interactionData = useRef(['None', 'Move', 'Drag']); const initializeChart = useEvent((flex) => { // show the marker when the mouse is over the chart flex.addEventListener(flex.hostElement, 'mouseenter', () => { setLmVisible(true); }); flex.addEventListener(flex.hostElement, 'mouseleave', () => { setLmVisible(false); }); }); const lineChanged = (flex) => { setLines(flex.selectedValue); }; const interactionChanged = (flex) => { setInteraction(flex.selectedValue); }; const markerContent = (ht) => { return ht.item ? wjCore.format('The value on <b>{date:MMM d, yyyy}</b><br/>is <b>{value:c}</b>', ht.item) : 'No items here...'; }; return (<div className="container-fluid"> <div className="form-group"> <label htmlFor="lines">Lines: </label> <wjInput.ComboBox itemsSource={linesData.current} selectedValue={lines} textChanged={lineChanged}/> <br /> <label htmlFor="interaction">Interaction: </label> <wjInput.ComboBox itemsSource={interactionData.current} selectedValue={interaction} textChanged={interactionChanged}/> <wjChart.FlexChart chartType="Line" bindingX="date" itemsSource={data} initialized={initializeChart}> <wjChart.FlexChartLegend position="None"/> <wjChart.FlexChartSeries binding="value" name="Value" tooltipContent=""/> <wjChart.FlexChartAxis wjProperty="axisY" majorGrid={false}/> <wjChart.FlexChartLineMarker lines={lines} interaction={interaction} isVisible={lmVisible} content={markerContent}/> </wjChart.FlexChart> </div> </div>); } const container = document.getElementById('app'); if (container) { const root = ReactDOM.createRoot(container); root.render(<App />); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo Wijmo FlexChart LineMarkers</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.40/system.src.js" integrity="sha512-G6mEj6h18+m3MvzdviSDfPle/TfH0//cXcB33AKlNR/Rha0yQsKefDZKRTkIZos97HEGq2JMV1RT5ybMoQ3WsQ==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
.wj-flexchart { height: 300px; margin: 10px 0; } .form-group .wj-flexchart .wj-chart-linemarker { background: transparent; } .wj-chart-linemarker-content { padding: 12px; margin: 6px; background: white; border-radius: 3px; box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23); } .wj-flexchart .wj-chart-linemarker .wj-chart-linemarker-hline, .wj-flexchart .wj-chart-linemarker .wj-chart-linemarker-vline { height: 1px; width: 1px; opacity: .5; background: navy; } .wj-control { margin-bottom: 3px; } label { width: 120px; text-align: right; }
import * as wjCore from '@mescius/wijmo'; function getData() { let arr = [], value = 100, date = new Date(); // for (let i = 0; i < 100; i++) { arr.push({ date: date, value: value + Math.random() * 10 - 4 }); // date = wjCore.DateTime.addDays(date, -1); } // return arr; } export const data = getData();
(function (global) { System.config({ transpiler: 'plugin-babel', babelOptions: { es2015: true, react: true }, meta: { '*.css': { loader: 'css' } }, paths: { // paths serve as alias 'npm:': 'node_modules/' }, // map tells the System loader where to look for things map: { 'jszip': 'npm:jszip/dist/jszip.js', '@mescius/wijmo': 'npm:@mescius/wijmo/index.js', '@mescius/wijmo.input': 'npm:@mescius/wijmo.input/index.js', '@mescius/wijmo.styles': 'npm:@mescius/wijmo.styles', '@mescius/wijmo.cultures': 'npm:@mescius/wijmo.cultures', '@mescius/wijmo.chart': 'npm:@mescius/wijmo.chart/index.js', '@mescius/wijmo.chart.analytics': 'npm:@mescius/wijmo.chart.analytics/index.js', '@mescius/wijmo.chart.animation': 'npm:@mescius/wijmo.chart.animation/index.js', '@mescius/wijmo.chart.annotation': 'npm:@mescius/wijmo.chart.annotation/index.js', '@mescius/wijmo.chart.finance': 'npm:@mescius/wijmo.chart.finance/index.js', '@mescius/wijmo.chart.finance.analytics': 'npm:@mescius/wijmo.chart.finance.analytics/index.js', '@mescius/wijmo.chart.hierarchical': 'npm:@mescius/wijmo.chart.hierarchical/index.js', '@mescius/wijmo.chart.interaction': 'npm:@mescius/wijmo.chart.interaction/index.js', '@mescius/wijmo.chart.radar': 'npm:@mescius/wijmo.chart.radar/index.js', '@mescius/wijmo.chart.render': 'npm:@mescius/wijmo.chart.render/index.js', '@mescius/wijmo.chart.webgl': 'npm:@mescius/wijmo.chart.webgl/index.js', '@mescius/wijmo.chart.map': 'npm:@mescius/wijmo.chart.map/index.js', '@mescius/wijmo.gauge': 'npm:@mescius/wijmo.gauge/index.js', '@mescius/wijmo.grid': 'npm:@mescius/wijmo.grid/index.js', '@mescius/wijmo.grid.detail': 'npm:@mescius/wijmo.grid.detail/index.js', '@mescius/wijmo.grid.filter': 'npm:@mescius/wijmo.grid.filter/index.js', '@mescius/wijmo.grid.search': 'npm:@mescius/wijmo.grid.search/index.js', '@mescius/wijmo.grid.grouppanel': 'npm:@mescius/wijmo.grid.grouppanel/index.js', '@mescius/wijmo.grid.multirow': 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"npm:react-use-event-hook/dist/esm/useEvent.js", }, // packages tells the System loader how to load when no filename and/or no extension packages: { src: { defaultExtension: 'jsx' }, "node_modules": { defaultExtension: 'js' }, } }); })(this);