Google Chart Api make use of datetime value

2019-04-15 22:59发布

站内文章 / PHP
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问题:

Hello I want in my chart to display the datetime, I made some search over the stack and I found similaer problems like this one but I could not understand how to fix that.

The part of the code that i believe i should change is the 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 chart right now look like this ...

and what i want is instead of 1000,2000...5000 to display the datetime from the data that I am displaying.

My database table that contains the datetime is the below...

Can you help me please??? :)

回答1:

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:

  1. array('label' => 'Date Time', 'type' => 'number') to array('label' => 'Date Time', 'type' => 'date')
  2. formed the date with 'Date(date("Y"),date("n") - 1,date("d"),0,0,0)' as described here

Here is the result with html in tooltip:

UPDATE

If you want custom tooltips, here is the doc for it. See the updated code above, you need to make three changes to customize tooltips:

  1. add the "virtual" column to the list of columns (with role = tooltip):

    array('type' => 'string', 'role' => 'tooltip', 'p' => array('html' => 'true')),

  2. add the value for the column in the 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>');

  3. and let jsapi know that the content is html:

    var options = {
  ...
  tooltip: {isHtml: true}
};

UPDATE

In order to customize horizontal axis values, you need to look at this first. Just add hAxis object (and its format) to the chart options object:

    var options = {
      ...
      hAxis: {
        format: 'yyyy-M-d'
      }
    };

and you'll see something like:



标签： php mysql json google-api google-visualization
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