Chart.js功能与使用方法小结

英文文档 https://www.chartjs.org/docs/2.8.0/
中文文档 https://chartjs-doc.abingoal.com

在react中的使用

开始使用

npm install chart.js --save

在相应的页面中引入 chartjs

import Chart from "chart.js"

先写一个小的demo

import React from "react"; import ReactDOM from "react-dom"; import Chart from "chart.js"; class App extends React.Component { constructor(props) { super(props); this.state = {}; } componentDidMount() { this.renderCanvas() } // 作图 renderCanvas = () => { const myChartRef = this.chartRef.getContext("2d"); new Chart(myChartRef, { type: "line", data: { labels: [1,2,3,4,5], datasets: [ { data: [10, 20, 50, 80, 100], backgroundColor: "rgba(71, 157, 255, 0.08)", borderColor: "rgba(0, 119, 255, 1)", pointBackgroundColor: "rgba(56, 96, 244, 1)", pointBorderColor: "rgba(255, 255, 255, 1)", pointRadius: 4 } ] }, options: { responsive: true, legend: { display: false }, maintainAspectRatio: false } }); }; render() { return ( <div style={{ height: 288 }}> <canvas ref={ref => (this.chartRef = ref)} /> </div> ); } } const rootElement = document.getElementById("root"); ReactDOM.render(<App />, rootElement);

动态更新的数据

import React from "react"; import ReactDOM from "react-dom"; import Chart from "chart.js"; let currentChart; class App extends React.Component { constructor(props) { super(props); this.state = { data: [30, 60, 90, 120, 100] }; } componentDidMount() { this.renderCanvas(); this.renderCurrent(); } // 作图 renderCanvas = () => { const myChartRef = this.chartRef.getContext("2d"); new Chart(myChartRef, { type: "line", data: { labels: [1, 2, 3, 4, 5], datasets: [ { data: [10, 20, 50, 80, 100], backgroundColor: "rgba(71, 157, 255, 0.08)", borderColor: "rgba(0, 119, 255, 1)", pointBackgroundColor: "rgba(56, 96, 244, 1)", pointBorderColor: "rgba(255, 255, 255, 1)", pointRadius: 4 } ] }, options: { responsive: true, legend: { display: false }, maintainAspectRatio: false } }); }; renderCurrent = () => { const { data } = this.state; const currentCharttemp = this.currentChart.getContext("2d"); if (typeof currentChart !== "undefined") { currentChart.destroy(); } currentChart = new Chart(currentCharttemp, { type: "line", data: { labels: [1, 2, 3, 4, 5], datasets: [ { data: data, backgroundColor: "rgba(71, 157, 255, 0.08)", borderColor: "rgba(0, 119, 255, 1)", pointBackgroundColor: "rgba(56, 96, 244, 1)", pointBorderColor: "rgba(255, 255, 255, 1)", pointRadius: 4 } ] }, options: { responsive: true, legend: { display: false }, maintainAspectRatio: false } }); }; render() { return ( <div> <canvas ref={ref => (this.chartRef = ref)} /> <br /> <button onClick={()=> this.setState({ data: [200, 500, 20, 50, 100] }, this.renderCurrent) } > 更新数据 </button> <canvas ref={ref => (this.currentChart = ref)} /> </div> ); } }

感兴趣的朋友可以使用在线HTML/CSS/JavaScript代码运行工具：测试上述代码运行效果。

更多关于JavaScript相关内容可查看本站专题：《JavaScript操作DOM技巧总结》、《JavaScript页面元素操作技巧总结》、《JavaScript事件相关操作与技巧大全》、《JavaScript查找算法技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript错误与调试技巧总结》