我正在使用Morris.js图显示我的MySQL数据。不幸的是，这些图形根本不可见。我遵循了一个简单的教程，仍然没有任何反应。我在代码中做错了什么？我假设data代码下的Morris.Bar格式应该不同。格式应该是什么？
<?php
$connect = mysqli_connect("localhost", "host", "", "_data");
$query = "SELECT * FROM Datas";
$result = mysqli_query($connect, $query);
$chart_data = '';
while($row = mysqli_fetch_array($result))
{
$chart_data .= "{ ID:'".$row["ID"]."', Name:".$row["Name"].", Wrongs:".$row["Wrongs"].", Rights:".$row["Rights"].", Percentage:".$row["Percentage"].", Age:".$row["Age"]."}, ";
}
$chart_data = substr($chart_data, 0);
?>
<!DOCTYPE html>
<html>
<head>
<title>Webslesson Tutorial | How to use Morris.js chart with PHP & Mysql</title>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.css">
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/raphael/2.1.0/raphael-min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.min.js"></script>
</head>
<body>
<br /><br />
<div class="container" style="width:900px;">
<h2 align="center">MySQL</h2>
<h3 align="center">Data</h3>
<br /><br />
<div id="chart"></div>
</div>
</body>
</html>
<script>
Morris.Bar({
element: 'chart',
data:[<?php echo $chart_data; ?>],
xkey: 'ID',
ykeys: ['Wrongs', 'Rights'],
labels: ['Wrongs', 'Rights'],
});
</script>
我发现了，我只需要添加一行函数就可以调用Morris.Bar该功能是在继续操作之前检查文档是否准备就绪：
<script>
$(document).ready(function () {
Morris.Bar({
element: 'chart',
data:[<?php echo $chart_data; ?>],
xkey: 'ID',
ykeys: ['Wrongs', 'Rights'],
labels: ['Wrongs', 'Rights'],
});
});
</script>