我正在快速掌握chart.js的反应速度。我在获取日期格式方面遇到了问题。这是我的代码:
var data = {
labels: labelArray,
title: {
text: "Date Time Formatting"
},
datasets: [{
label: 'Temperature',
data: dataArray,
tension: 0,
borderColor: "rgb(248,169,113)",
backgroundColor: "rgba(0,0,0,0)",
radius: 0,
borderWidth: 1,
pointHitRadius: 5
}]
};
var options = {
title: "This is a test",
xAxes: {
title: "time",
gridThickness: 2,
unit: "day",
unitStepSize: 1000,
type: 'time',
time: {
displayFormats: {
millisecond: 'MMM DD',
second: 'MMM DD',
minute: 'MMM DD',
hour: 'MMM DD',
day: 'MMM DD',
week: 'MMM DD',
month: 'MMM DD',
quarter: 'MMM DD',
year: 'MMM DD',
}
}
}
}
class LineExample extends(Component) {
componentWillMount() {
let json = getJSONObject();
}
render() {
// console.log ("Labels: " + labelArray);
return (<div>
<h2>Line Example</h2>
<Line data={data} options={options}/>
</div>);
}
};
class LineExample extends(Component) {
componentWillMount() {
let json = getJSONObject();
}
render() {
// console.log ("Labels: " + labelArray);
return (<div>
<h2>Line Example</h2>
<Line data={data} options={options}/>
</div>);
}
};
似乎选项可能无法正常工作(但这只是猜测)。
这是输出,x轴上的日期是完整的日期时间字符串。这是一张图片:
答案 0 :(得分:1)
根据react-chartjs-2(check the python docs)的renderChart方法,选项prop直接传递给Chart以创建实例。将选项传递给chartjs时,与比例相关的选项需要嵌套在关键比例下,然后分别在time和gridLines键下嵌套。像这样
var options = {
title: {text: "This is a test"},
scales: {
xAxes: [{
title: "time",
type: 'time',
gridLines: {
lineWidth: 2
},
time: {
unit: "day",
unitStepSize: 1000,
displayFormats: {
millisecond: 'MMM DD',
second: 'MMM DD',
minute: 'MMM DD',
hour: 'MMM DD',
day: 'MMM DD',
week: 'MMM DD',
month: 'MMM DD',
quarter: 'MMM DD',
year: 'MMM DD',
}
}
}]
}
}
如果您计划使用&#39; day&#39;您可能需要调整unitStepSize。作为单位。