如何让highcharts折线图读取数据库json格式数据并在图表上显示?
如何让highcharts折线图读取数据库json格式数据并在图表上显示?本人是菜鸟一枚,最近在做一个项目遇到这样的问题,项目要求是读取数据库里的json格式数据,但是我...
如何让highcharts折线图读取数据库json格式数据并在图表上显示?本人是菜鸟一枚,最近在做一个项目遇到这样的问题,项目要求是读取数据库里的json格式数据,但是我做的highcharts折线图最多只能做到通过ajax读取本地json格式文件里的数据,做不到读取数据库里的json格式数据。希望各位大大能告知小弟,万分感激~为了让解答的各位能充分了解我的情况,我会截图,麻烦各位大大了~
希望能提供代码,谢谢 展开
希望能提供代码,谢谢 展开
1个回答
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Highcharts与Ajax结合实现实时刷新图表——PHP版
参考网址:网页链接
参考官网:网页链接
一、环境及sql
use test;
CREATE TABLE `test` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`datetime` char(10) NOT NULL,
`data` double DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=31 DEFAULT CHARSET=latin1;
insert into test (datetime,data) values
('2013-10-01',20.5),('2013-10-02',23.7),('2013-10-03',22.4),('2013-10-04',29.0),('2013-10-05',22.2),
('2013-10-06',22.6),('2013-10-07',26.9),('2013-10-08',28.0),('2013-10-09',24.1),('2013-10-10',27.1),
('2013-10-11',23.6),('2013-10-12',28.8),('2013-10-13',22.4),('2013-10-14',23.6),('2013-10-15',24.2),
('2013-10-16',22.6),('2013-10-17',26.2),('2013-10-18',28.2),('2013-10-19',21.7),('2013-10-20',25.2),
('2013-10-21',25.0),('2013-10-22',21.6),('2013-10-23',25.7),('2013-10-24',21.7),('2013-10-25',22.2),
('2013-10-26',25.6),('2013-10-27',26.2),('2013-10-28',26.0),('2013-10-29',23.2),('2013-10-30',22.4);
<!DOCTYPE HTML>
<html>
<head>
<title>Test</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<script type="text/javascript" src="js/jquery-1.8.3.min.js"></script>
<script type="text/javascript" src="js/highcharts.js"></script>
<script>
//图表属性,不包含数据
var options = {
chart: {
renderTo: 'container',
type: 'spline',
},
title: {
text: '实时温度曲线',
x: -20 //center
},
xAxis: {},
yAxis: {
title: {
text: 'Temperature (°C)'
},
plotLines: [{
value: 0,
width: 1,
color: '#808080'
}]
},
series: [{
name: '温度',
}],
tooltip: {
valueSuffix: '°C'
},
plotOptions: {
spline: {
dataLabels: {
enabled: true
},
animation: false,
},
},
};
//初始函数,设置定时器,定时取数据
$(function() {
queryData(0);
var i = 0;
var timer = setInterval(function() {
i++;
if (i >= 3) {
i = 0;
}
queryData(i);
}, 3000);
//停止刷新
$("button").click(function() {
clearInterval(timer);
});
});
var categories = [];
var datas = [];
//Ajax 获取数据并解析创建Highcharts图表
function queryData(index) {
$.ajax({
url: 'getDatas.php?index=' + index,
type: 'get',
dataType: "json",
success: function(data) {
$.each(data, function(i, n) {
categories[i] = n[1];
datas[i] = n[2] * 1;
});
options.xAxis.categories = categories;
options.series[0].data = datas;
chart = new Highcharts.Chart(options);
}
});
}
</script>
</head>
<body>
<div id="container" style="min-width:800px;height:400px;"></div>
<p align=center>
<button>停止刷新</button>
</p>
</body>
</html>
2、getDatas.php
复制代码
<?php
$db_name = "test";
$db_host = "localhost";
$db_user = "root";
$db_pass = "root";
$index = 0;
if(isset($_GET['index'])) {
$index = (int)$_GET['index'];
}
$link = mysql_connect($db_host,$db_user,$db_pass) or die("Can't connect DB");
$db = mysql_select_db($db_name);
mysql_query("set names utf8");
$result =mysql_fetch_row(mysql_query("select count(*) from test"));
$pages = ((int)($result[0]))/10;
if($index > ($pages-1)) {
$index = ($pages-1);
}
$select = "select * from test limit ".($index*10).",10";
$result = mysql_query($select);
$datas = array();
while($row = mysql_fetch_row($result)) {
$datas[] = $row;
}
echo json_encode($datas);
?>
三、资源下载
百度网盘下载:
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