如何在 react 项目中隐藏 chart.js 中的图例? [英] How to hide the legend in chart.js in a react project?
问题描述
我正在尝试隐藏使用 Chart.js 创建的图表的图例.
根据官方文档(
如文档中所述，您将配置图例的命名空间链接为:options.plugins.legend，如果你把它它会在那里工作:
var options = {类型:'线'，数据: {标签:[红色"，蓝色"，黄色"，绿色"，紫色"，橙色"]，数据集:[{标签:'投票数'，数据:[12、19、3、5、2、3]，边框颜色:'粉红色'}]},选项: {插件:{传奇: {显示:假}}}}var ctx = document.getElementById('chartJSContainer').getContext('2d');新图表(ctx，选项)；<body><canvas id="chartJSContainer" width="600" height="400"></canvas><script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.0/chart.js"></script></body>另一方面，您的选项对象的很大一部分是错误的，当您使用 v3 时，它是 V2 语法，请查看 迁移指南
您在图例中得到 undefined 作为文本的原因是，您没有在数据集中提供任何 label 参数.
I am trying to hide the legend of my chart created with Chart.js.
According to the official documentation (https://www.chartjs.org/docs/latest/configuration/legend.html), to hide the legend, the display property of the options.display object must be set to false.
I have tried to do it in the following way:
const options = {
legend: {
display: false,
}
};
But it doesn't work, my legend is still there. I even tried this other way, but unfortunately, without success.
const options = {
legend: {
display: false,
labels: {
display: false
}
}
}
};
This is my full code.
import React, { useEffect, useState } from 'react';
import { Line } from "react-chartjs-2";
import numeral from 'numeral';
const options = {
legend: {
display: false,
},
elements: {
point: {
radius: 1,
},
},
maintainAspectRatio: false,
tooltips: {
mode: "index",
intersect: false,
callbacks: {
label: function (tooltipItem, data) {
return numeral(tooltipItem.value).format("+0,000");
},
},
},
scales: {
xAxes: [
{
type: "time",
time: {
format: "DD/MM/YY",
tooltipFormat: "ll",
},
},
],
yAxes: [
{
gridLines: {
display: false,
},
ticks: {
callback: function(value, index, values) {
return numeral(value).format("0a");
},
},
},
],
},
};
const buildChartData = (data, casesType = "cases") => {
let chartData = [];
let lastDataPoint;
for(let date in data.cases) {
if (lastDataPoint) {
let newDataPoint = {
x: date,
y: data[casesType][date] - lastDataPoint
}
chartData.push(newDataPoint);
}
lastDataPoint = data[casesType][date];
}
return chartData;
};
function LineGraph({ casesType }) {
const [data, setData] = useState({});
useEffect(() => {
const fetchData = async() => {
await fetch("https://disease.sh/v3/covid-19/historical/all?lastdays=120")
.then ((response) => {
return response.json();
})
.then((data) => {
let chartData = buildChartData(data, casesType);
setData(chartData);
});
};
fetchData();
}, [casesType]);
return (
<div>
{data?.length > 0 && (
<Line
data={{
datasets: [
{
backgroundColor: "rgba(204, 16, 52, 0.5)",
borderColor: "#CC1034",
data: data
},
],
}}
options={options}
/>
)}
</div>
);
}
export default LineGraph;
Could someone help me? Thank you in advance!
PD: Maybe is useful to try to find a solution, but I get 'undefined' in the text of my legend and when I try to change the text like this, the text legend still appearing as 'Undefindex'.
const options = {
legend: {
display: true,
text: 'Hello!'
}
};
As described in the documentation you linked the namespace where the legend is configured is: options.plugins.legend, if you put it there it will work:
var options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'pink'
}
]
},
options: {
plugins: {
legend: {
display: false
}
}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.0/chart.js"></script>
</body>
On another note, a big part of your options object is wrong, its in V2 syntax while you are using v3, please take a look at the migration guide
Reason why you get undefined as text in your legend is, is because you dont supply any label argument in your dataset.
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