Google Chart Api 利用日期时间值答案

【问题标题】：Google Chart Api make use of datetime valueGoogle Chart Api 利用日期时间值
【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】：

标签： php mysql json google-api google-visualization

【解决方案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