Google Chart Api 利用日期时间值
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【中文标题】Google Chart Api 利用日期时间值【英文标题】:Google Chart Api make use of datetime value 【发布时间】:2015-07-07 17:37:45 【问题描述】:您好,我想在我的图表中显示日期时间,我在堆栈中进行了一些搜索,发现类似this 的问题,但我不明白如何解决这个问题。
我认为我应该更改的代码部分如下..
<?php
$DB_NAME = 'project';
$DB_HOST = 'localhost';
$DB_USER = 'root';
$DB_PASS = 'smogi';
include_once 'header.php';
$view = ($_GET['view']);
$username2 =$_SESSION['username'];
$firstDate= $_POST['firstdatepicker'];
$lastDate= $_POST['lastdatepicker'];
$typeValue = ($_POST['typeValue']);
$startHour = ($_POST['startHour']);
$firstMin = ($_POST['firstMin']);
$lastHour = ($_POST['lastHour']);
$lastMin = ($_POST['lastMin']);
$firstTime = $startHour.':'.$firstMin.':00';
$lastTime = $lastHour.':'.$lastMin.':00';
$con = mysqli_connect('localhost','root','smogi','project');
/* Establish the database connection */
$mysqli = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);
if (mysqli_connect_errno())
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
$sql="SELECT sensorValue,datetime FROM sensors WHERE username='$view' AND datetime BETWEEN '$firstDate''$firstTime' AND '$lastDate''$lastTime' AND typeValue='$typeValue' ORDER BY datetime DESC";
$result = mysqli_query($con,$sql);
$rows = array();
$table = array();
$table['cols'] = array(
// Labels for your chart, these represent the column titles.
array('label' => 'Date Time', 'type' => 'date'),
array('label' => 'Sensor Value', 'type' => 'number')
);
/* Extract the information from $result */
foreach($result as $r)
$temp = array();
// The following line will be used to slice the chart
$temp[] = array('v' => 'Date('.date('Y',strtotime($r['datetime'])).','.(date('n',strtotime($r['datetime'])) - 1).','.date('d',strtotime($r['datetime'])).',0,0,0)');
// Values of the each slice
$temp[] = array('v' => (int) $r['sensorValue']);
$rows[] = array('c' => $temp);
$table['rows'] = $rows;
// convert data into JSON format
$jsonTable = json_encode($table);
//echo $jsonTable;
?>
<html>
<head>
<!--Load the Ajax API-->
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript">
// Load the Visualization API and the piechart package.
google.load('visualization', '1', 'packages':['corechart']);
// Set a callback to run when the Google Visualization API is loaded.
google.setOnLoadCallback(drawChart);
function drawChart()
// Create our data table out of JSON data loaded from server.
var data = new google.visualization.DataTable(<?=$jsonTable?>);
var options =
hAxis: title: 'Date & Time',
vAxis: title: 'Sensor Values',
title: 'Sensor Data',
is3D: 'true',
width: 900,
height: 600
;
// Instantiate and draw our chart, passing in some options.
var chart = new google.visualization.ScatterChart(document.getElementById('chart_div'));
chart.draw(data, options);
</script>
</head>
<body>
<!--this is the div that will hold the pie chart-->
<div id="chart_div"></div>
</body>
</html>
我现在的图表是这样的......
我想要的是而不是 1000,2000...5000 来显示我正在显示的数据中的日期时间。
包含日期时间的我的数据库表如下...
你能帮帮我吗??? :)
【问题讨论】:
【参考方案1】:我刚刚尝试了以下代码:
<?php
$rows = array();
$table = array();
$table['cols'] = array(
// Labels for your chart, these represent the column titles.
array('label' => 'Date Time', 'type' => 'date'),
array('label' => 'Sensor Value', 'type' => 'number'),
array('type' => 'string', 'role' => 'tooltip', 'p' => array('html' => 'true')),
);
$result = array(
array('datetime' => '2015-04-25 00:00:00', 'sensorValue' => 5),
array('datetime' => '2015-04-25 14:30:00', 'sensorValue' => 10),
array('datetime' => '2015-04-26 02:10:10', 'sensorValue' => 15),
array('datetime' => '2015-04-26 12:10:10', 'sensorValue' => 17),
array('datetime' => '2015-04-27 03:45:23', 'sensorValue' => 25),
array('datetime' => '2015-04-28 15:34:00', 'sensorValue' => 4),
);
/* Extract the information from $result */
foreach($result as $r)
$temp = array();
// The following line will be used to slice the chart
$temp[] = array('v' => 'Date('.date('Y',strtotime($r['datetime'])).',' .
(date('n',strtotime($r['datetime'])) - 1).','.
date('d',strtotime($r['datetime'])).','.
date('H',strtotime($r['datetime'])).','.
date('i',strtotime($r['datetime'])).','.
date('s',strtotime($r['datetime'])).')');
// Values of the each slice
$temp[] = array('v' => (int) $r['sensorValue']);
$temp[] = array('v' => 'This is a <b>custom</b> tooltip. Insert your data as you like: On the 25th of April, 2015 the sensor value was: <b>5</b>');
$rows[] = array('c' => $temp);
$table['rows'] = $rows;
// convert data into JSON format
$jsonTable = json_encode($table);
?>
<html>
<head>
<script type="text/javascript"
src="https://www.google.com/jsapi?autoload=
'modules':[
'name':'visualization',
'version':'1',
'packages':['corechart']
]
"></script>
<script type="text/javascript">
google.setOnLoadCallback(drawChart);
function drawChart()
var data = new google.visualization.DataTable(<?php echo $jsonTable; ?>);
var options =
title: 'Company Performance',
curveType: 'function',
legend: position: 'bottom' ,
tooltip: isHtml: true
;
var chart = new google.visualization.ScatterChart(document.getElementById('curve_chart'));
chart.draw(data, options);
</script>
</head>
<body>
<div id="curve_chart" style="width: 900px; height: 500px"></div>
</body>
</html>
所以我改变了:
array('label' => 'Date Time', 'type' => 'number')
到 array('label' => 'Date Time', 'type' => 'date')
与'Date(date("Y"),date("n") - 1,date("d"),0,0,0)'
形成日期,如here 所述
这是工具提示中带有 html 的结果:
更新
如果您想要自定义工具提示,here 就是它的文档。见上面更新的代码,自定义tooltips需要做三处修改:
将“虚拟”列添加到列列表中(角色 = 工具提示):
array('type' => 'string', 'role' => 'tooltip', 'p' => array('html' => 'true')),
在循环中为列添加值:
$temp[] = array('v' => 'This is a <b>custom</b> tooltip. Insert your data as you like: On the 25th of April, 2015 the sensor value was: <b>5</b>');
并让jsapi知道内容是html:
var options =
...
tooltip: isHtml: true
;
更新
要自定义横轴值,需要先查看this。只需将hAxis
对象(及其format
)添加到图表选项对象:
var options =
...
hAxis:
format: 'yyyy-M-d'
;
你会看到类似的东西:
【讨论】:
首先感谢您的宝贵时间,但我希望它是散点图:-/ 时间(小时、分钟、秒)呢?如果你想检查更新的代码 我随时间更新了我的答案。抱歉,我硬编码了时间/日期值,没有心情创建测试 mysql 表并在那里插入值。希望您理解 Date() 构造函数在 JSON 数据中返回的想法和主要内容 是的,谢谢,我寻找了类似的解决方案,但无法成功。最后一件事,如果你想看,我们可以增加盒子的大小(prntscr.com/6zaa6o),让它也显示时间吗? 只需将日期和时间用作文本,就像您将其注入文本或 html 中一样。同样,这只是 text/html,它不会被 JSAPI 解释以上是关于Google Chart Api 利用日期时间值的主要内容,如果未能解决你的问题,请参考以下文章
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