标签:php ajax google-visualization
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>
带有AJAX请求的新代码
<!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(num) {
var data = new google.visualization.DataTable(TableData);
var TableData = $.ajax({
url: "getdata.php",
data: "q="+num,
dataType:"json",
async: false
}).responseText;
// Create and draw the visualization.
new google.visualization.LineChart(document.getElementById('visualization')).
draw(data, {curveType: "none",
title: "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 style="font-family: Arial;border: 0 none;">
<form>
<select name="users" onchange="drawVisualization(this.value)">
<option value="">Select unit:</option>
<option value="0001">0001</option>
<option value="0002">0002</option>
</select>
</form>
<div id="visualization" style="width: 100%; height: 400px;"></div>
</body>
</html>
getdata.php代码
<?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']}' } ]); ";
}
?>
解决方法:
建议使用php以谷歌接受的形式获取json
以下是使用ajax从php获取json数据并绘制谷歌图表的完整示例
PHP
<?php
require("dbconnect.php");
$db = mysql_connect($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);
$rows = array();
$table = array();
$table['cols'] = array(
array('label' => 'Time', 'type' => 'string'),
array('label' => 'Wind_Speed', 'type' => 'number'),
array('label' => 'Wind_Gust', 'type' => 'number')
);
while ($row = mysql_fetch_assoc($sqlResult)) {
$temp = array();
$temp[] = array('v' => (string) $row['Time']);
$temp[] = array('v' => (float) $row['Wind_Speed']);
$temp[] = array('v' => (float) $row['Wind_Gust']);
$rows[] = array('c' => $temp);
}
$table['rows'] = $rows;
echo json_encode($table);
?>
并且不建议使用 – > async:false
或内联事件处理程序 – > < select name =“users”onchange =“drawVisualization(this.value)”>
此外,hAxis和vAxis应该只在图表选项中出现一次
html / javascript
<!DOCTYPE>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>
Wind Graph
</title>
<script src="http://www.google.com/jsapi"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
google.load('visualization', '1', {
// google-vis callback
callback: function () {
// add event listener to select element
$("#users").change(drawChart);
function drawChart() {
$.ajax({
url: 'getdata.php',
// use value from select element
data: 'q=' + $("#users").val(),
dataType: 'json',
success: function (responseText) {
// use response from php for data table
var data = new google.visualization.DataTable(responseText);
new google.visualization.LineChart(document.getElementById('visualization')).
draw(data, {
curveType: 'none',
title: 'Wind Chart',
titleTextStyle: {
color: 'orange'
},
interpolateNulls: 1
});
},
error: function(jqXHR, textStatus, errorThrown) {
console.log(errorThrown + ': ' + textStatus);
}
});
}
},
packages: ['corechart']
});
</script>
</head>
<body style="font-family: Arial;border: 0 none;">
<form>
<select id="users">
<option value="" selected disabled>Select unit:</option>
<option value="0001">0001</option>
<option value="0002">0002</option>
</select>
</form>
<div id="visualization" style="width: 100%; height: 400px;"></div>
</body>
</html>
标签:php,ajax,google-visualization 来源: https://codeday.me/bug/20190915/1804811.html
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