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Chart.js 使用小结
官方文档
英文文档 https://www.chartjs.org/docs/…
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 id="myChart" ref={ref => (this.chartRef = ref)} />
</div>
);
}
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
https://codesandbox.io/embed/…
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 id="myChart" ref={ref => (this.chartRef = ref)} />
<br />
<button
onClick={()=>
this.setState({data: [200, 500, 20, 50, 100] }, this.renderCurrent)
}
>
更新数据
</button>
<canvas id="currentChart7" ref={ref => (this.currentChart = ref)} />
</div>
);
}
}
https://blog.bitsrc.io/custom…
正文完
发表至: javascript
2019-08-09