我正在尝试使用 google api 创建 google 图表,它适用于此:
<?php
echo "hi";
$mysqli =mysqli_connect('127.0.0.1:3306', 'root', 'root', 'test');
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: ".mysqli_connect_error();
}
$result = $mysqli->query('SELECT * FROM new_view');
$rows = array();
$table = array();
$table['cols'] = array(
array('label' => 'ind_type', 'type' => 'string'),
array('label' => 'Index_val', 'type' => 'number')
);
/* Extract the information from $result */
foreach($result as $r) {
$temp = array();
// The following line will be used to slice the Pie chart
$temp[] = array('v' => (string) $r['ind_type']);
// Values of the each slice
$temp[] = array('v' => (int) $r['Index_val']);
$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 = {
title: 'Index analysis',
is3D: 'true',
width: 800,
height: 600
};
// Instantiate and draw our chart, passing in some options.
// Do not forget to check your div ID
var chart = new google.visualization.PieChart(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>
但是现在我尝试将 html 部分放入另一个文件中,将数据库部分放入另一个文件中,如下所示:
ajax_form_temp.php
<html>
<head>
<!--Load the Ajax API-->
<meta content="text/html;charset=utf-8" http-equiv="Content-Type" />
<meta content="utf-8" http-equiv="encoding" />
<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() {
var jsonTable = $.ajax({
url:"ajax_graph_temp.php",
dataType:"json",
async:true
}).responseText;
// Create our data table out of JSON data loaded from server.
var data = new google.visualization.DataTable(jsonTable);
var options = {
title: 'Index analysis',
is3D: 'true',
width: 800,
height: 600
};
// Instantiate and draw our chart, passing in some options.
// Do not forget to check your div ID
var chart = new google.visualization.PieChart(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>
和 ajax_graph_temp.php
<?php
$mysqli =mysqli_connect('127.0.0.1:3306', 'root', 'root', 'test');
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: ".mysqli_connect_error();
}
$result = $mysqli->query('SELECT * FROM new_view');
$rows = array();
$table = array();
$table['cols'] = array(
array('label' => 'ind_type', 'type' => 'string'),
array('label' => 'Index_val', 'type' => 'number')
);
/* Extract the information from $result */
foreach($result as $r) {
$temp = array();
// The following line will be used to slice the Pie chart
$temp[] = array('v' => (string) $r['ind_type']);
// Values of the each slice
$temp[] = array('v' => (int) $r['Index_val']);
$rows[] = array('c' => $temp);
}
$table['rows'] = $rows;
// convert data into JSON format
$jsonTable = json_encode($table);
echo $jsonTable;
?>
代码是一样的。就在第二种方法中,使用 json 获取表数据。但是在行var data = new google.visualization.DataTable(jsonTable);
jsonTable 无法获取列,尽管它存在。
在浏览器中:Table has no column error
来了!列已声明$table['cols'] = array(
array('label' => 'ind_type', 'type' => 'string'),
array('label' => 'Index_val', 'type' => 'number')
问题出在哪里?