Javascript 使用highcharts从mysql数据库向折线图添加动态数据
我想用ajax或json将数据点添加到我的折线图中,现在我必须重新加载整个网页以在图表上显示我的新数据。但我想通过添加以下链接来显示实时数据: 我试图从mysql中检索数据,并通过json添加到图表中,但什么也没发生。这是我在live-server-data.php中的代码:Javascript 使用highcharts从mysql数据库向折线图添加动态数据,javascript,php,jquery,mysql,highcharts,Javascript,Php,Jquery,Mysql,Highcharts,我想用ajax或json将数据点添加到我的折线图中,现在我必须重新加载整个网页以在图表上显示我的新数据。但我想通过添加以下链接来显示实时数据: 我试图从mysql中检索数据,并通过json添加到图表中,但什么也没发生。这是我在live-server-data.php中的代码: <?php header("Content-type: text/json"); include_once 'include/connection.php'; $db = new DB_Class();
<?php
header("Content-type: text/json");
include_once 'include/connection.php';
$db = new DB_Class();
$query = "select distinct idchip from datatable ";
$result = mysql_query( $query );
$rows = array();
$count = 0;
while( $row = mysql_fetch_array( $result ) ) {
$SQL1 = "SELECT datetime,temperature FROM `datatable` WHERE idchip=".$row['0']." datetime DESC limit 0,1 ";
$result1 = mysql_query($SQL1);
while ($rows = mysql_fetch_array($result1)) {
$data[] = $rows['1'];
$datatime[] = 'moment('.$rows['0'].').valueOf()';
}
// The x value is the current JavaScript time, which is the Unix time multiplied
// by 1000.
$x = $datatime;
// The y value is a random number
$y = $data;
}
// Create a PHP array and echo it as JSON
$ret = array($x, $y);
echo json_encode($ret);
?>
这是我的图表,我现在重新加载页面以获取新数据,但我想在图表中添加新点以实现“实时”
我假设图中有多个系列,其中后端每次为每个系列提供一个点 为了简单起见,我建议以毫秒为单位返回时间。我对PHP不是很在行,但我想重点很清楚
<?php
header("Content-type: text/json");
include_once 'include/connection.php';
$db = new DB_Class();
$query = "select distinct idchip from datatable ";
$result = mysql_query( $query );
$rows = array();
$count = 0;
while( $row = mysql_fetch_array( $result ) ) {
$SQL1 = "SELECT datetime,temperature FROM `datatable` WHERE idchip=".$row['0']." ORDER BY datetime DESC limit 0,1 ";
$serie = new StdClass;
$serie->name = $row['0'];
$result1 = mysql_query($SQL1);
$points = array();
while ($rows = mysql_fetch_array($result1)) {
$points[] = array(strtotime($rows['0']) * 1000, $rows['1']);
}
$serie->data = $points;
$series[] = $serie;
}
// Create a PHP array and echo it as JSON
$ret = $series;
echo json_encode($ret);
?>
客户端代码将为:
var chart;
var chartSeries = {};
var latestTimeReported = {};
function requestData() {
$.ajax({
url: 'live-server-data.php',
success: function(seriesUpdate) {
//in case initializer of highcharts is too quick - skip the update
if (!chart) {
setTimeout(requestData, 1000);
return;
}
$.each(seriesUpdate, function (serieIndex, serieUpdate) {
var existingSerie = chartSeries[serieUpdate.name];
var newPoint = serieUpdate.data[0];
var lastInsertedTime = latestTimeReported[serieUpdate.name];
if (lastInsertedTime && lastInsertedTime < newPoint[0]) {
console.log('Attempt inserting old data!!!!');
return;
}
latestTimeReported[serieUpdate.name] = newPoint[0];
if (existingSerie) {
var shift = existingSerie.data.length > 20;
existingSerie.addPoint(newPoint , true, shift);
} else {
var newSerie = chart.addSeries({
name: serieUpdate.name,
data: serieUpdate.data
}, true);
chartSeries[serieUpdate.name] = newSerie;
}
});
// call it again after one second
setTimeout(requestData, 1000);
},
cache: false
});
}
$(document).ready(function() {
chart = new Highcharts.Chart({
chart: {
renderTo: 'container',
defaultSeriesType: 'spline',
events: {
load: requestData
}
},
title: {
text: 'Live random data'
},
xAxis: {
type: 'datetime',
tickPixelInterval: 150,
maxZoom: 20 * 1000
},
yAxis: {
minPadding: 0.2,
maxPadding: 0.2,
title: {
text: 'Value',
margin: 80
}
},
series: []
});
var图;
var chartSeries={};
var latestTimeReported={};
函数requestData(){
$.ajax({
url:“live server data.php”,
成功:功能(系列更新){
//如果highcharts的初始值设定值太快-跳过更新
如果(!图表){
setTimeout(requestData,1000);
返回;
}
$.each(系列更新,函数(系列索引,系列更新){
var existingSerie=chartSeries[serieUpdate.name];
var newPoint=serieUpdate.data[0];
var lastInsertedTime=latestTimeReported[SerieuUpdate.name];
if(lastInsertedTime&&lastInsertedTime20;
现有serie.addPoint(newPoint、true、shift);
}否则{
var newSerie=chart.addSeries({
名称:serieUpdate.name,
数据:serieUpdate.data
},对);
chartSeries[serieUpdate.name]=newSerie;
}
});
//一秒钟后再打
setTimeout(requestData,1000);
},
缓存:false
});
}
$(文档).ready(函数(){
图表=新的高点图表。图表({
图表:{
renderTo:'容器',
defaultSeriesType:“样条线”,
活动:{
加载:请求数据
}
},
标题:{
文本:“实时随机数据”
},
xAxis:{
键入:“日期时间”,
像素间隔:150,
最大缩放:20*1000
},
亚克斯:{
最小填充:0.2,
最大填充:0.2,
标题:{
文本:“值”,
差额:80
}
},
系列:[]
});
您可以在这里看到新的更新示例
显示“尝试插入旧数据!!!!”。
并且没有显示实时数据
展示
JSON
在requestData函数中,将“图表”引用替换为“this”。您的点变量是什么样子的(您从ajax获得的)?注释不用于扩展讨论;此对话已完成。
var chart;
var chartSeries = {};
var latestTimeReported = {};
function requestData() {
$.ajax({
url: 'live-server-data.php',
success: function(seriesUpdate) {
//in case initializer of highcharts is too quick - skip the update
if (!chart) {
setTimeout(requestData, 1000);
return;
}
$.each(seriesUpdate, function (serieIndex, serieUpdate) {
var existingSerie = chartSeries[serieUpdate.name];
var newPoint = serieUpdate.data[0];
var lastInsertedTime = latestTimeReported[serieUpdate.name];
if (lastInsertedTime && lastInsertedTime < newPoint[0]) {
console.log('Attempt inserting old data!!!!');
return;
}
latestTimeReported[serieUpdate.name] = newPoint[0];
if (existingSerie) {
var shift = existingSerie.data.length > 20;
existingSerie.addPoint(newPoint , true, shift);
} else {
var newSerie = chart.addSeries({
name: serieUpdate.name,
data: serieUpdate.data
}, true);
chartSeries[serieUpdate.name] = newSerie;
}
});
// call it again after one second
setTimeout(requestData, 1000);
},
cache: false
});
}
$(document).ready(function() {
chart = new Highcharts.Chart({
chart: {
renderTo: 'container',
defaultSeriesType: 'spline',
events: {
load: requestData
}
},
title: {
text: 'Live random data'
},
xAxis: {
type: 'datetime',
tickPixelInterval: 150,
maxZoom: 20 * 1000
},
yAxis: {
minPadding: 0.2,
maxPadding: 0.2,
title: {
text: 'Value',
margin: 80
}
},
series: []
});