如何解决当您有很多数组元素时,过滤数据以在 react-chartjs-2 中更加可视化数据
我想在我的图表上获得适当的可视化数据,但它很混乱,因为有 1000 个数组元素。我不想减少数据,但实际上是为了获得适当的可视化,因为在图表的 x 轴上它显示的是 NaN 值。
fetch("./data.json")
.then((res) => {
return res.json();
})
.then((data) => {
console.log(data);
for (const dataObj of data) {
empSal.push(parseInt(dataObj.intensity));
empAge.push(parseInt(dataObj.start_year));
}.catch((err) => {
console.log(err);
});
(1000) [{…},{…}, …]
样本数据(data.json):
[
{
"end_year": "","intensity": 6,"sector": "Energy","topic": "gas","insight": "Annual Energy Outlook","url": "http://www.eia.gov/outlooks/aeo/pdf/0383(2017).pdf","region": "northern America","start_year": "","impact": "","added": "January,20 2017 03:51:25","published": "January,09 2017 00:00:00","country": "United States of America","relevance": 2,"pestle": "Industries","source": "EIA","title": "U.S. natural gas consumption is expected to increase during much of the projection period.","likelihood": 3
},
....
希望输出为:
解决方法
您可以filter data
数组同时具有 start_year
和 intensity
以及 map 两个值:
const intensity = data.filter(el => el.intensity && el.start_year).map(val => val.intensity);
const year = data.filter(el => el.intensity && el.start_year).map(val => val.start_year);
使用这两个,您可以根据您的要求绘制图形
样本数据过滤示例here
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