Google Chart Api uses datetime value
Hello I want my chart to display the datetime, I did a stack search and I found similar problems like this but I couldn't figure out how to fix it.
The part of the code that I believe should change is below.
<?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>
My diagram now looks like this:
and what I want is instead of 1000,2000 ... 5000 to display the date and time from the data I am showing.
My database table containing datetime is below ...
Can you help me?:)
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I just tried the following code:
<?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>
so I changed:
-
array('label' => 'Date Time', 'type' => 'number')
toarray('label' => 'Date Time', 'type' => 'date')
- date from
'Date(date("Y"),date("n") - 1,date("d"),0,0,0)'
as described here
Here is the result with html in the tooltip:
UPDATE
If you need special tooltips, here is the doc for it. See the updated code above, you need to make three changes to customize the tooltips:
-
add column "virtual" to the column list (using role = tooltip):
array('type' => 'string', 'role' => 'tooltip', 'p' => array('html' => 'true')),
-
add the value for the column in a loop:
$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>');
-
and let jsapi know the html content is:
var options = { ... tooltip: {isHtml: true} };
UPDATE
To adjust the horizontal axis values, you first need to look at this . Just add the object hAxis
(and it format
) to the chart options object:
var options = {
...
hAxis: {
format: 'yyyy-M-d'
}
};
and you will see something like:
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