通过AJAX请求根据用户输入重绘Google图表

通过AJAX请求根据用户输入重绘Google图表

我有一个谷歌图表从我的数据库中提取数据,这是我想要的。根据URL中的get请求,它从选定的表中绘制数据。

我想根据下拉菜单中的选定表格通过ajax更新此图表。我无法突破的部分是通过ajax响应数据。我认为下面的代码是接近的,但我得到了以下错误,我似乎无法摆脱。

getdata.php:22未捕获的ReferenceError:$未定义drawVisualization @ getdata.php:22onchange @ getdata.php:47

我尝试从getdata.php中删除GET请求并硬编码一个表,认为这是$ not defined,但是没有解决错误。

工作图代码

<!DOCTYPE>

<html>

<head> 

<meta http-equiv="content-type" content="text/html; charset=utf-8"/>

<title>

Wind Graph

</title>

<script type="text/javascript" src="http://www.google.com/jsapi"></script>

<script type="text/javascript">

google.load('visualization', '1', {packages: ['corechart']});

</script>

<script type="text/javascript">


function drawVisualization() {


var data = new google.visualization.DataTable();


<?php

require("dbconnect.php");


echo " data.addColumn('string', 'Time');";

echo " data.addColumn('number', 'Wind_Speed');";

echo " data.addColumn('number', 'Wind_Gust');";


$db = mysql_connect($server, $user_name, $password);

mysql_select_db($database);


$sqlQuery = "SELECT * FROM ".$_GET['q']." WHERE Date(Time + INTERVAL 10 HOUR) = Date(UTC_TIMESTAMP() + INTERVAL 10 HOUR)";

$sqlResult = mysql_query($sqlQuery);

while ($row = mysql_fetch_assoc($sqlResult)) {


echo " data.addRow(['{$row['Time']}', {v: {$row['Wind_Speed']}, f: '{$row['Wind_Speed']}' }, {v: {$row['Wind_Gust']}, f: '{$row['Wind_Gust']}' } ]); ";


}


?>


// Create and draw the visualization.

new google.visualization.LineChart(document.getElementById('visualization')).

draw(data, {curveType: "none",

title: "AU0001 Wind Chart",

titleTextStyle: {color: "orange"},

//width: 800, height: 400,

//vAxis: {maxValue: 10},

vAxis: {minValue: 0},

vAxis: {title: 'Wind Speed (Knots)'},

vAxis: {baseline: 0},

vAxis: {gridlines: {count: 10}  },

vAxis: {title: "Wind Speed (Knots)", titleTextStyle: {color: "orange"}},

hAxis: {title: "Time", titleTextStyle: {color: "orange"}},

interpolateNulls: 1

}

);

}


google.setOnLoadCallback(drawVisualization);

</script>

</head>

<body>

<div id="visualization" style="width: 100%; height: 400px;"></div>

</body>

</html>


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2回答

扬帆大鱼

我在html文件的页面加载时得到以下错误:graphindexnew1.php:14未捕获的ReferenceError:$未定义回调@ graphindexnew1.php:14它指向这行代码$("#users").change(drawChart);
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