我在这里很新（以及一般的网络开发），所以请原谅我长期存在的任何误用......我正在尝试使用MesoWest Mesonet返回的数据（以JSON格式）创建一个基本的windrose图API服务。我正在使用HighCharts（或尝试），并且不能完全使用它。也许这是由于我从API本身获取数据的方法，因为我在这方面是一个完全的业余爱好者。以下是Javascript代码，后跟页面的HTML。有人可以看看，让我知道我做错了什么？当我尝试加载它时，页面上没有显示任何内容。另外，如果您对MesoWest的API调用的具体情况感到好奇，就像我在这里使用的那样，请参阅http://mesowest.org/api/docs/ .js脚本：
var windrose = {
divname: "windrosediv",
tkn: "eecfc0259e2946a68f41080021724419",
load:function()
{
console.log('loading')
if (!window.jQuery) {
var script = document.createElement("script");
script.src = 'https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js';
script.type = 'text/javascript';
document.getElementByTagName("head")[0].appendChild(script);
setTimeout(pollJQuery, 100)
return
}
this.div = $("#"+this.divname);
this.request('WBB');
},
pollJQuery:function()
{
if (!window.jQuery) {
setTimeout(pollJQuery,100);
} else {
load();
}
},
request:function(stn){
console.log("making a request")
$.getJSON(http://api.mesowest.net/v2/stations/nearesttime?callback=?',
{
stid:stn,
within:1440,
units:'english',
token:windrose.tkn
}, this.receive);
},
receive:function (data)
{
console.log(data,windrose);
stn = data.STATION[0]
dat = stn.OBSERVATIONS
spd += Math.round(dat.wind_speed_value_1.value)
dir += dat.wind_direction_value_1.value
windDataJSON = [];
for (i = 0; i < dir.length; i++) {
windDataJSON.push([ dir[i], spd[i]
]);
},
}
$(function () {
var categories = ['0', '45', '90', '135', '180', '225', '270', '315'];
$('#container').highcharts({
series: [{
data: windDataJSON
}],
chart: {
polar: true,
type: 'column'
},
title: {
text: 'Wind Rose'
},
pane: {
size: '85%'
},
legend: {
align: 'right',
verticalAlign: 'top',
y: 100,
layout: 'vertical'
},
xAxis: {
min: 0,
max: 360,
type: "",
tickInterval: 22.5,
tickmarkPlacement: 'on',
labels: {
formatter: function () {
return categories[this.value / 22.5] + '°';
}
}
},
yAxis: {
min: 0,
endOnTick: false,
showLastLabel: true,
title: {
text: 'Frequency (%)'
},
labels: {
formatter: function () {
return this.value + '%';
}
},
reversedStacks: false
},
tooltip: {
valueSuffix: '%'
},
plotOptions: {
series: {
stacking: 'normal',
shadow: false,
groupPadding: 0,
pointPlacement: 'on'
}
}
});
}）;
HTML：
<!DOCTYPE html>
<html>
<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/highcharts-more.js"></script>
<script src="https://code.highcharts.com/modules/data.js">`enter code </script>
<script src="https://code.highcharts.com/modules/exporting.js"> </script>
<div id="container" style="min-width: 420px; max-width: 600px; height: 400px; margin: 0 auto"></div>
<p class="ex">
<script type="text/javascript" src="http://home.chpc.utah.edu/~u0675379/apiDemos/windTest.js"></script>
</p>
</html>
我很感谢这方面的任何指导，谢谢！ - 将
答案 0 :(得分：1)
@ W.Howard，我认为这里的问题是你如何处理和准备API的JSON响应。请考虑以下JavaScript来检索和解析数据：
/*
* Helper function
* scalarMultiply(array, scalar)
*/
function scalarMultiply(arr, scalar) {
for (var i = 0; i < arr.length; i++) {
arr[i] = arr[i] * scalar;
}
return arr;
}
/*
* getQuery(station, api_token)
*/
function getQuery(station, mins, api_token) {
$.getJSON('http://api.mesowest.net/v2/stations/timeseries?callback=?', {
/* Specify the request parameters here */
stid: station,
recent: mins, /* How many mins you want */
obtimezone: "local",
vars: "wind_speed,wind_direction,wind_gust",
jsonformat: 2, /* for diagnostics */
token: api_token
},
function(data) {
try {
windSpeed = data.STATION[0].OBSERVATIONS.wind_speed_set_1;
windDir = data.STATION[0].OBSERVATIONS.wind_direction_set_1;
windGust = data.STATION[0].OBSERVATIONS.wind_gust_set_1;
} catch (err) {
console.log("Data is invalid. Check your API query");
console.log(this.url);
exit();
}
/* Convert from knots to mph */
windSpeed = scalarMultiply(windSpeed, 1.15078);
//windGust = scalarMultiply(windGust, 1.15078);
/* Create and populate array for plotting */
windData = [];
for (i = 0; i < windSpeed.length; i++) {
windData.push([windDir[i], windSpeed[i]]);
}
/* Debug */
// console.log(windData);
console.log(this.url);
plotWindRose(windData, mins);
})
};
我们现在拥有的是具有风向和风速的二维阵列，我们可以将其传递给绘图功能。以下是更新的绘图功能：
/*
* Plot the wind rose
* plotWindRose([direction, speed])
*/
function plotWindRose(windData, mins) {
/*
* Note:
* Because of the nature of the data we will accept the HighCharts Error #15.
* --> Highcharts Error #15 (Highcharts expects data to be sorted).
* This only results in a performance issue.
*/
var categories = ["0", "45", "90", "135", "180", "225", "270", "315"];
$('#wind-rose').highcharts({
series: [{
name: "Wind Speed",
color: '#cc3000',
data: windData
}],
chart: {
type: 'column',
polar: true
},
title: {
text: 'Wind Direction vs. Frequency (Last ' + mins/60. + ' hours)'
},
pane: {
size: '90%',
},
legend: {
align: 'right',
verticalAlign: 'top',
y: 100,
text: "Wind Direction"
},
xAxis: {
min: 0,
max: 360,
type: "",
tickInterval: 45,
tickmarkPlacement: 'on',
labels: {
formatter: function() {
return categories[this.value / 45] + '\u00B0';
}
}
},
yAxis: {
min: 0,
endOnTick: false,
showLastLabel: true,
title: {
text: 'Frequency (%)'
},
labels: {
formatter: function() {
return this.value + '%';
}
},
reversedStacks: false
},
tooltip: {
valueSuffix: '%'
},
plotOptions: {
series: {
stacking: 'normal',
shadow: false,
groupPadding: 20,
pointPlacement: 'on'
}
}
});
}
你可以在https://gist.github.com/adamabernathy/eda63f14d79090ab1ea411a8df1e246e看到这一切。祝你好运！