我需要使用 servlet 中的“json”数据生成动态“highchart”饼图，数据库方法运行正确，但 json 部分未将任何数据传递到饼图。
“下面是我的 servlet 代码”
公共(public)类 SubCountyAjaxApplications 扩展了 HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
ArrayList<Applications> Rawpplications = AdminDB.sub_countyApplications();
response.setContentType("text/html");
response.setHeader("Cache-control", "no-cache, no-store");
response.setHeader("Pragma", "no-cache");
response.setHeader("Expires", "-1");
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST");
response.setHeader("Access-Control-Allow-Headers", "Content-Type");
response.setHeader("Access-Control-Max-Age", "86400");
Gson gson = new Gson();
JsonArray results = new JsonArray();
for (Applications application : Rawpplications) {
JsonObject myObj = new JsonObject();
myObj.addProperty("key",application.getSub_county());
System.out.println(application.getSub_county()+":"+application.getAmount_applied());
myObj.addProperty("value",application.getAmount_applied());
results.add(myObj);
}
out.println(results.getAsJsonArray());
out.close();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
//下面是我的javascript文件，标题出现但没有图表
var chart;
$(document).ready(
function () {
chart = new Highcharts.Chart({
chart: {
renderTo: 'chart',
},
title: {
text: 'County Application Distribution'
},
tooltip: {
formatter: function () {
var s;
if (this.point.name) { // the pie chart
s = '' + this.point.name + ': ' + this.y
+ ' Bugs';
} else {
s = '' + this.x + ': ' + this.y;
}
return s;
}
},
labels: {
items: [{
html: '',
style: {
left: '40px',
top: '8px',
color: 'black'
}
}]
},
series: [{
type: 'pie',
name: 'Total Bugs',
data: [],
center: [70, 50],
size: 50,
showInLegend: false,
dataLabels: {
enabled: false
},
}, ]
},function getdata(chart) {
var tmp = "";
var receivedData = "";
$.ajax({
url: 'SubCountyAjaxApplications',
dataType: 'json',
error: function () {
alert("error occured!!!");
},
success: function (data) {
var chartData = [];
$.each(data.jsonArray, function (index)
{
$.each(data.jsonArray[index],
function (key, value) {
var point = [];
point.push(key);
point.push(value);
chartData.push(point);
});
});
chart.series[0].setData(chartData);
}
});
});
});
我哪里做错了
最佳答案
假设您的 ajax 调用返回的数据采用您上面指定的格式:
[{"key":"CHANGAMWE","label":"20,000"},{"key":"JOMVU","label":"55,000"},{"key":"Kathiani","label":"42,000"},{"key":"KISAUNI","label":"60,000"},{"key":"LIKONI","label":"20,000"},{"key":"Machakos Town","label":"15,000"},{"key":"MVITA","label":"15,000"},{"key":"NYALI","label":"35,000"}]
您可以像这样改变解析循环，为 Highcharts 返回适当的数据数组:
var chartData = [];
$.each(data, function (i, node) {
chartData.push( [ node.key, parseFloat(node.label) ] );
});
示例:
关于javascript - 数据库、servlet、json、javascript 和 highchart 饼图，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36548122/