来自数据库的动态样条高图

问题描述：

我尝试制作样条高图并实施How to load data from JSON to Highchart?的解决方案，这是来自Mina Gabriel的答案。代码看起来像这样。来自数据库的动态样条高图

在test.php

} 
// Set the JSON header 
header("Content-type: text/json"); 

// The x value is the current JavaScript time, which is the Unix time multiplied  by  1000. 
$x = time() * 1000; 
$y = rand(0,100) ; 



// Create a PHP array and echo it as JSON 
$ret = array($x, $y); 
echo json_encode($ret); 
?>

而在highchart脚本：

<script> 
/** 
* Request data from the server, add it to the graph and set a timeout to request again 
*/ 
var chart; // global 
function requestData() { 
$.ajax({ 
    url: 'http://localhost:8080/test.php', 
    success: function(point) { 
     var series = chart.series[0], 
      shift = series.data.length > 20; // shift if the series is longer than 20 

     // add the point 
     chart.series[0].addPoint(point, true, shift); 

     // call it again after one second 
     setTimeout(requestData, 1000);  
    }, 
    cache: false 
    }); 
} 
$(document).ready(function() { 
    chart = new Highcharts.Chart({ 
     chart: { 
     renderTo: 'container', 
     defaultSeriesType: 'spline', 
     events: { 
      load: requestData 
     } 
    }, 
    title: { 
     text: 'Live random data' 
    }, 
    xAxis: { 
     type: 'datetime', 
     tickPixelInterval: 100, 
     maxZoom: 20 * 1000 
    }, 

    yAxis: { 
     minPadding: 0.2, 
     maxPadding: 0.2, 
     title: { 
      text: 'Value', 
      margin: 80 
     } 
    }, 
    series: [{ 
     name: 'Random data', 
     data: [] 
    }] 
    });   
}); 
    </script> 
    < /head> 
<body>

而那些刚刚工作。但是，当我试图改变在test.php的代码来设置y值从数据库这样一个数字：

<?php 
header("Content-type: text/json"); 
$db = mysql_connect("localhost","myusername","mypassword"); 
mysql_select_db("mydatabase"); 


$day=date('Y-m-d'); //UTC standar time 

$result = mysql_query("SELECT COUNT(*) FROM table WHERE time='{$day}';"); 
$count = mysql_fetch_array($result); 

// The x value is the current JavaScript time, which is the Unix time multiplied by  1000. 
$x = time() * 1000; 
$y = $count[0]; 

// Create a PHP array and echo it as JSON 
$ret = array($x, $y); 
echo json_encode($ret); 
?>

线图不起作用。我检查了SQL代码，它的工作原理正确。我错过了什么？

你可以请求ajax调用后返回的JSON后？ – 2012-08-04 05:27:43

是的，这里需要更多信息。你可以在ajax成功回调中添加一个断点“var series = chart.series [0]”，并分享你有的点的确切值 – 2012-08-04 05:47:35

如果有任何答案有帮助，请相应地投票/标记 – 2012-08-06 21:31:05

答

从给定的信息和this post，我最好的选择是$ count [0]是一个字符串，highcharts需要它是严格的数字。你可以尝试以下对我来说

$y = intval($count[0]); // OR floatval($count[0]);

是的，你是对的。。感谢:) – user1397595 2012-08-09 15:56:42

很高兴。我想你现在可以标记答案 – 2012-08-09 16:40:13

老实说，我不知道该怎么做？：D怎么样？ – user1397595 2012-08-09 16:51:03

来自数据库的动态样条高图

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