将PHP解析的JSON数据从MySQL提供给Morris.js Chart

时间：2015-08-18 04:10:49

标签： javascript php mysql json morris.js

潜入新项目并尝试自学JSON，PHP，MySQL和Morris.js。

我想要实现的一些背景。

我有一个PHP文件，可以访问网页并获取JSON数据。 （现在我只是把它设置为抓住一切）。然后使用它抓取的数据将其放入mysql数据库。我现在已经设置了一个Cron作业，每1分钟运行一次这个文件，这样我就可以将一些数据流入这个数据库。 

<?php
//connect to mysql db
$con = mysql_connect('localhost','user','password',"") or die('Could not connect: ' . mysql_error());
//connect to the database
mysql_select_db('database', $con);

//read the json file contents
$jsondata = file_get_contents('http://192.168.10.243/j');

//convert json object to php associative array
$data = json_decode($jsondata, true);

//get the device details
$id = $data['data']['id'];
$type = $data['data']['type'];
$detector = $data['data']['detector'];
$cpm = $data['data']['cpm'];
$temperature = $data['data']['temperature'];
$uptime = $data['data']['uptime'];

//insert into mysql table
$sql = "INSERT INTO database_table_1(id, type, detector, cpm, temperature, uptime)
VALUES('$id', '$type', '$detector', '$cpm', '$temperature', '$uptime')";
if(!mysql_query($sql,$con))
{
    die('Error : ' . mysql_error());
} 
?>

在此之后，我再次使用PHP将MySQL中的信息解析为JSON数组。现在它将解析它拥有的所有MySQL数据（我不确定这现在是好事还是我应该想办法解析MySQL的最新数据。）让我知道你是什么认为

<?php
//open connection to mysql db
$connection = mysqli_connect('localhost','user','password','database_table_1') or die("Error " . mysqli_error($connection));

//fetch table rows from mysql db
$sql = "select * from database_table_1";
$result = mysqli_query($connection, $sql) or die("Error in Selecting " . mysqli_error($connection));

//create an array
$emparray[] = array();
while($row =mysqli_fetch_assoc($result))
{
   array_push(
    $emparray,
    array(
            'a' => $row['timestamp'],
            'w' => $row['id'],
            'x' => $row['cpm'],
            'y' => $row['temperature'],
            'Z' => $row['uptime']
         )
    );
} 
// $emparray[] = $row;
echo json_encode($emparray);
//close the db connection
mysqli_close($connection); 
?>

现在如果我自己手动运行这个PHP文件，我会收到很多像这样格式化的JSON数据。

[{"a":"2015-08-17 21:34:01","w":"110000","x":"16","y":"28","Z":"112094"}]

现在我的计划是让这些信息使用morris.js图表​​更新网页上的图表。这是我当前的index.html页面，其中PHP脚本和morris.js部分位于底部附近。 

<!DOCTYPE html>
<html lang="en">

<!-- morris.js dependencies -->
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.css">
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/raphael/2.1.0/raphael-min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.min.js"></script>

<head>

    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="">
    <meta name="author" content="">

    <title>Chart V0.1</title>

    <!-- Bootstrap Core CSS -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <!-- Custom CSS -->
    <link href="css/simple-sidebar.css" rel="stylesheet">

    <!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
        <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
        <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->

</head>

<body>

    <div id="wrapper">

    <!-- Sidebar -->
    <div id="sidebar-wrapper">
        <ul class="sidebar-nav">
            <li class="sidebar-brand">
                <a href="#">
                    Start Bootstrap
                </a>
            </li>
            <li>
                <a href="#">Dashboard</a>
            </li>
        </ul>
    </div>
    <!-- /#sidebar-wrapper -->

    <!-- Page Content -->
    <div id="page-content-wrapper">
  <div id="myfirstchart" style="height: 300px;"></div>
        <div class="container-fluid">
            <div class="row">
                <div class="col-lg-12">
                    <h1>Simple Sidebar</h1>
                    <p> This template has a responsive menu toggling system.</p>
                    <a href="#menu-toggle" class="btn btn-default" id="menu-toggle">Toggle Menu</a>
                </div>
            </div>
        </div>
    </div>
    <!-- /#page-content-wrapper -->

</div>
<!-- /#wrapper -->

<!-- PHP from Mysql to Json array -->
<?php
//open connection to mysql db
$connection = mysqli_connect('localhost','user','password','database_table_1') or die("Error " . mysqli_error($connection));

//fetch table rows from mysql db
$sql = "select * from database_table_1";
$result = mysqli_query($connection, $sql) or die("Error in Selecting " . mysqli_error($connection));

//create an array
$emparray[] = array();
while($row =mysqli_fetch_assoc($result))
{
   array_push(
    $emparray,
    array( 
       'a' => $row['timestamp'],
       'w' => $row['id'],
       'x' => $row['cpm'],
       'y' => $row['temperature'],
       'Z' => $row['uptime']
         )
              );
 }

   // $emparray[] = $row;
   echo json_encode($emparray);

   //close the db connection
   mysqli_close($connection);
?>
<!-- Json Pull -->
<script>
     Morris.Area({
  // ID of the element in which to draw the chart.
  element: 'myfirstchart',
  // Chart data records -- each entry in this array corresponds to a point on the chart.
    data: <?php echo json_encode($emparray);?>, 
  // The name of the data record attribute that contains x-values.
  xkey: 'a',
  // A list of names of data record attributes that contain y-values.
  ykeys: ['x'],
  // Labels for the ykeys -- will be displayed when you hover over the chart.
  labels: ['x-test'] 
  });
</script>

<!-- jQuery -->
<script src="js/jquery.js"></script>

<!-- Bootstrap Core JavaScript -->
<script src="js/bootstrap.min.js"></script>

<!-- Menu Toggle Script -->
<script>
$("#menu-toggle").click(function(e) {
    e.preventDefault();
    $("#wrapper").toggleClass("toggled");
});
</script>

到目前为止，我已经完成了这个新项目的大部分内容，但我目前仍然难以理解如何从PHP脚本中获取可以解析的数据并将其提供给morris.js图表​​或图表。我想拥有它，所以图表或图表现在每1分钟更新一次，而morris.js图表​​将从我的PHP脚本中获取数据。

任何帮助，想法，链接或最佳实践都会有很多帮助。我的编码经验几乎没有，所以我提前道歉。

谢谢

更新：

我将PHP脚本迁移出HTML页面，并尝试通过HTML页面中的$ .getJSON调用PHP结果。虽然我仍然无法让morris.js使用解析后的数据。我甚至没有得到任何想法的图表？

    <!-- Ajax  -->
<script>
$.getJSON('export_php_test_1.php', function( data ){
     Morris.Area({
  // ID of the element in which to draw the chart.
  element: 'myfirstchart',
  // Chart data records -- each entry in this array corresponds to a point on the chart.
    data: data,  
  // The name of the data record attribute that contains x-values.
  xkey: 'a',
  // A list of names of data record attributes that contain y-values.
  ykeys: 'x',
  // Labels for the ykeys -- will be displayed when you hover over the chart.
  labels: 'x-test' 
  });
});
</script>

1 个答案:

答案 0 :(得分：2)

您可以使用meta refresh。以下代码将在60秒后自动刷新完整的html页面。

<meta http-equiv="refresh" content="60">

如果您只想刷新图表部分，那么您必须将内联php代码移除到单独的源代码，并使用Ajax获取morris的数据。如果这样做，那么您可以使用JS函数setInterval以定期间隔运行Ajax。

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