所有,
我正在使用以下HTML / Javascript代码:
<!doctype html>
<html>
<head>
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<!-- google fonts from CDN -->
<link href='http://fonts.googleapis.com/css?family=Open+Sans:400,300,600' rel='stylesheet' type='text/css'>
<!-- highcharts -->
<script src="http://code.highcharts.com/highcharts.js"></script>
<style>
html, body {
width: 95%;
margin: auto;
font-family: 'Open Sans',sans-serif;
}
#chart_container {
width:100%;
height:500px;
}
</style>
</head>
<body>
<h1>Live Data</h1>
<div id="chart_container">
</div>
</body>
<script type="text/javascript">
$(document).ready(function() {
chart = new Highcharts.Chart({
chart: {
renderTo: 'chart_container',
defaultSeriesType: 'line',
events: {
load: getBirds
}
},
title: {
text: 'DRHW Live Data Stream'
},
xAxis: {
type: 'datetime',
tickPixelInterval: 150,
maxZoom: 20 * 1000
},
yAxis: {
title: {
text: 'Count Observed'
}
},
series: [
],
legend: {
layout: 'horiztonal',
align: 'center'
}
});
function getBirds() {
var now = new Date();
var et = now.getTime() / 1000; //PHP TS
var st = et - 10; //30 seconds prior in PHP
console.log(chart);
if (chart.series.length > 0) {
var series = chart.series[0];
var length = series.length + 1;
var shift = series.data.length > 20;
}
$.getJSON("https://path/to/json&callback=?", function(result) {
var data = result.data;if (data.length == 0) {
return;
} else {
additions = new Array();
for (i=0;i<data.length;i++) {
if (data[i].qstype != "1") {
species = data[i].answers[0]['answer'];
scode = species.substring(0,species.search(" - ")).trim()
count = (data[i].answers[1]['answer'] * 1);
newdata = new Object();
newdata['name'] = species;
newdata['count'] = count;
additions.push(newdata);
}
}
//now, for each addition, you need to loop through the existing data structures, and see if the thing exists. if it does, add the data; if not, add the thing, then add the data.
var existingdata = chart.series;
for (i=0;i<additions.length;i++) {
isnewpoint = true;
for (j=0;j<existingdata.length;j++) {
if (existingdata[j].name == additions[i].name) {
isnewpoint = false
count = additions[i].count;
point = [now.getTime(),count];
chart.series[j].addPoint(point, true, shift);
shift = false; //this way, only one shift occurs - the first time through adding a new point to an existing data set. this will control against future shifting, either from other datapoints having new points added,
}
}
if (isnewpoint) {
newseries = new Object();
count = additions[i].count;
newseries['name'] = additions[i].name;
for (j=0;j<length;j++) {
newseries['data'].push(0);
}
newseries['data'].push(count);
chart.series.push(newseries);
}
}
//we have now looped through and added a new data point to all species where new data was created in this pull. We still need to add a new point to those that were not affected.
existingdata = chart.series;
for (i=0;i<existingdata.length;i++) {
getname = existingdata[i].name;
getlength = existingdata[i].data.length;
if (getlength<length) { //which we established earlier as one MORE than existed previously, prior to the addition
point = [now.getTime(),0]
chart.series[i].addPoint(point, true, shift);
}
}
}
setTimeout(getBirds,10000);
});
}
});
</script>
</html>
我遇到的问题非常简单(但是让我发疯了!),并且早在js块中。尽管我将变量'chart'定义为新的Highcharts图表,并且将'getBirds'设置为要在加载后加载的函数,但console.log行告诉我该图表未定义,下面的行它将引发错误(
Uncaught TypeError: Cannot read property 'series' of undefined
)。我检查了以下内容:
chart
变量(当然,该变量定义了console.log的图表,但未定义下一行所需的chart.series
); getBirds()
函数放在chart
定义上方。 我很茫然。提供的任何帮助将不胜感激;提前致谢!
最佳答案
原因很可能是您无法在变量声明阶段引用它。我猜是在声明加载函数时调用了它。幸运的是,您可以在函数声明期间引用该对象。尝试下面的代码块。
function getBirds(e) {
var now = new Date(),
et = now.getTime() / 1000, //PHP TS
st = et - 10, //30 seconds prior in PHP
chart = this;
if (chart.series.length > 0) {
...在其中的var块中声明
chart
变量。