我在使用 flot 绘制数据库中的数据时遇到问题。在 php 中使用json_encode
我试图获取绘图数据,但我没有成功。以下是我的代码,请帮忙
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>`enter code here`
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Flot Examples</title>
<link href="./flot/layout.css" rel="stylesheet" type="text/css">
<!--[if lte IE 8]><script language="javascript" type="text/javascript" src="../excanvas.min.js"></script><![endif]-->
<script language="javascript" type="text/javascript" src="./flot/jquery.js"></script>
<script language="javascript" type="text/javascript" src="./flot/jquery.flot.js"></script>
</head>
<body>
<h1>Database Plotting</h1>
<div id="placeholder" style="width:600px;height:300px;"></div>
<?php
$server = "localhost";
$user="user";
$password="password";
$database = "database";
$connection = mysql_connect($server,$user,$password);
$db = mysql_select_db($database,$connection);
$query = "SELECT x_value, y_value FROM table";
$result = mysql_query($query);
while($row = mysql_fetch_assoc($result))
{
$dataset1[] = array($row['x_value'],$row['y_value']);
}
?>
<script type="text/javascript">
$(function () {
var dataset1 = <?php echo json_encode($dataset1,); ?>;
$.plot($("#placeholder"),[dataset1] );
});
</script>
</body>
</html>
因此,来自的输出json-encode dataset1
如下[["1380111342","0"],["1380111679","0"],["1380112099","20"],["1380112109","300"],["1380112114","40"],["1380112120","56"],["1380112127","36"],["1380112132","40"],["1380112138","78"]]