我有一个带有Year及其值的数据结构json,我将在我的highcharts上显示它。
如何在多年之间过滤它?例如,如果我在2016年至2018年的下拉列表中选择,它将仅显示2016 2017和2018年的数据。
这是我的数据结构
[
{
"New_Students": "321",
"NSYEAR": "2014",
"NSterm": null,
"NStermCat": null,
"NSCareer": null,
"NSProgDescr": null,
"NSStudent": null
},
{
"New_Students": "1923",
"NSYEAR": "2015",
"NSterm": null,
"NStermCat": null,
"NSCareer": null,
"NSProgDescr": null,
"NSStudent": null
},
{
"New_Students": "293",
"NSYEAR": "2016",
"NSterm": null,
"NStermCat": null,
"NSCareer": null,
"NSProgDescr": null,
"NSStudent": null
},
{
"New_Students": "29",
"NSYEAR": "2017",
"NSterm": null,
"NStermCat": null,
"NSCareer": null,
"NSProgDescr": null,
"NSStudent": null
},
{
"New_Students": "524",
"NSYEAR": "2018",
"NSterm": null,
"NStermCat": null,
"NSCareer": null,
"NSProgDescr": null,
"NSStudent": null
}
]
到目前为止这是我的输出。
这是我获取json数据的代码
var strCampus = "<%=MyProperty%>";
var MyUpdateDate = "<%=UpdateDate%>";
var ParamYear;
var OnClickYearVal;
var Year = [];
var user_data = [];
//Rdata.ParamYear = ParamYear;
var drill_down_data = [];
$(function () {
$.getJSON('http://localhost:37590/get_NSData/' + strCampus, function (jsonData) {
const data = jsonData
console.log(data);
let categories = [],
series = [],
i,
j;
var chartSeriesData = [];
var chartDrilldownData = [];
for (i = 0; i < data.length; i++) {
categories[i] = data[i].NSYEAR + '-' + [parseFloat(data[i].NSYEAR) + 1];
Year = [data[i].NSYEAR]
series.push({
name: [+data[i].NSYEAR] + ' School Year',
data: [{ y: +data[i].New_Students }],
});
for (j = 0; j < i; j++) {
series[i].data.unshift(null);
}
}
提前谢谢你的帮助。
您可以使用setExtremes
轴方法将下拉事件与图表范围绑定:
var chart = Highcharts.chart('container', {
...,
xAxis: {
minRange: 0,
...
}
});
document.getElementById('selectFrom')
.addEventListener('change', function() {
chart.xAxis[0].setExtremes(Number(this.value), chart.xAxis[0].max);
});
document.getElementById('selectTo')
.addEventListener('change', function() {
chart.xAxis[0].setExtremes(chart.xAxis[0].min, Number(this.value));
});
现场演示:http://jsfiddle.net/BlackLabel/xevgsjdo/
API参考:https://api.highcharts.com/class-reference/Highcharts.Axis#setExtremes
解析您的JSON数据并使用Array.prototype.filter()
例如:
// allData is your parsed JSON data
const filteredByYear = allData.filter(function(single) {
if (single["NSYEAR"] >= 2016 && single["NSYEAR"] <= 2018) {
return single;
}
});
使用filter
和typeOf NSYEAR
是string
所以你必须转换成number
:
function getFilterDataBetweenYears(fromYear, toYear) {
return data.filter(obj => {
if (+obj["NSYEAR"] >= fromYear && +obj["NSYEAR"] <= toYear) {
return obj;
}
});
}