Chart.js使用小结_024

摘要：使用小结官方文档英文文档中文文档在中的使用开始使用在相应的页面中引入先写一个小的作图动态更新的数据作图更新数据

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

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 (
      

         (this.chartRef = ref)} />
      
    );
  }
}

const rootElement = document.getElementById("root");
ReactDOM.render(, rootElement);

https://codesandbox.io/embed/...

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 (
      

         (this.chartRef = ref)} />
        


        
            this.setState({ data: [200, 500, 20, 50, 100] }, this.renderCurrent)
          }
        >
          更新数据
        
         (this.currentChart = ref)} />
      
    );
  }
}

https://blog.bitsrc.io/custom...