我正在尝试使用 HighChart 生成一个简单的折线图。下面给出了源代码。挑战在于我在屏幕上显示了 X 轴和 Y 轴，但图表本身丢失了。当我在屏幕上移动光标时，我可以看到屏幕上显示的 X 和 Y 值。我尝试调试该程序，但无法找到解决方案。有人可以指导我吗？
问候
萨钦
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript" src="js/highcharts.js"></script>
<!--[if IE]>
<script type="text/javascript" src="../js/excanvas.compiled.js"></script>
<![endif]-->
<!-- 2. Add the JavaScript to initialize the chart on document ready -->
<script type="text/javascript">
$(document).ready(function() {
var options = {
chart: {
renderTo: 'container',
type: 'line'
},
title: {
text: 'Pollution Level'
},
xAxis: {
categories: [''],
title: {
text: 'Date'
}
},
yAxis: {
title: {
text: 'Pollution %'
}
},
series: []
};
$.get('data/graphs/pollution.csv', function(data) {
window.alert(data);
// Split the lines
var lines = data.split('\n');
window.alert(lines);
lines = lines.map(function(line) {
var data = line.split(',');
data[1] = parseFloat(data[1]);
return data;
});
window.alert(lines);
var series = {
data: lines
};
options.series.push(series);
var chart = new Highcharts.Chart(options);
});
});
</script>
</head>
<body >
<div id="container" style="width: 610px; height: 610px; margin: 0 auto"></div>
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript" src="js/highcharts.js"></script>
<!--[if IE]>
<script type="text/javascript" src="../js/excanvas.compiled.js"></script>
<![endif]-->
<!-- 2. Add the JavaScript to initialize the chart on document ready -->
<script type="text/javascript">
$(document).ready(function() {
var options = {
chart: {
renderTo: 'container',
type: 'line'
},
title: {
text: 'Pollution Level'
},
xAxis: {
categories: [''],
title: {
text: 'Date'
}
},
yAxis: {
title: {
text: 'Pollution %'
}
},
series: []
};
$.get('data/graphs/pollution.csv', function(data) {
window.alert(data);
// Split the lines
var lines = data.split('\n');
window.alert(lines);
lines = lines.map(function(line) {
var data = line.split(',');
data[1] = parseFloat(data[1]);
return data;
});
window.alert(lines);
var series = {
data: lines
};
options.series.push(series);
var chart = new Highcharts.Chart(options);
});
});
</script>
</head>
<body >
<div id="container" style="width: 610px; height: 610px; margin: 0 auto"></div>
</body>
</html>2016 年 3 月 1 日更新
我已将程序修改如下。我仍然无法获得折线图。有趣的是，如果我将图表类型从“线”更改为“柱”，我可以看到图表。不确定问题所在。请指教。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript" src="js/highcharts.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<!--[if IE]>
<script type="text/javascript" src="../js/excanvas.compiled.js"></script>
<![endif]-->
<!-- 2. Add the JavaScript to initialize the chart on document ready -->
<script type="text/javascript">
$(document).ready(function() {
var options = {
chart: {
renderTo: 'container',
defaultSeriesType: 'line'
},
title: {
text: 'Pollution Level'
},
xAxis: {
categories: [''],
title: {
text: 'Date'
}
},
yAxis: {
title: {
text: 'Pollution %'
}
},
series: [ {
plotLines: [{
color: '#000000'
}],
data: []
}]
};
$.get('data/graphs/pollution.csv', function(data) {
window.alert(data);
// Split the lines
var lines = data.split('\n');
window.alert(lines);
var series = {
data: [],
name: 'serie1'
};
lines = lines.map(function(line) {
var data = line.split(',');
if (data[0] != "DATE"){
options.xAxis.categories.push(data[0]);
data1 = parseFloat(data[1]);
series.data.push(parseFloat(data[1]));
return data;
}
});
options.series.push(series);
var chart = new Highcharts.Chart(options);
});
});
</script>
</head>
<body >
<div id="container" style="width: 610px; height: 610px; margin: 0 auto"></div>
<?php
?>
</body>
</html>最佳答案
确保您获取的是有效值而不是字符串: 请检查此部分:
lines = lines.map(function(line) {
var data = line.split(',');
data[1] = parseFloat(data[1]);
return data;
});
问:您能否分享您的 CSV (pollution.csv)？
感谢您提供的数据:请检查以下example 解析部分是:
for (i = 0; i < lines.length; i++) {
var items = lines[i].split(',');
if (i == 0) {
ctg[0] = items[0];
ctg[1] = items[1];
} else {
dataYAxis.push([(new Date(items[0])).getTime(), parseFloat(items[1])]);
}
}
如您所见，我从数据中分离出了标题(DATE、LVL)，下一步是将数据保存在 dataYAxis 数组中:首先是日期，其次是数据。我在 xAxis 中使用“datetime”来显示 xAxis 标签中的日期。
关于javascript - 使用 HighChart 的简单折线图，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35702508/