ไม่ทราบว่าต้องเขียนยังไงถึงจะสร้าง stack chart ด้วย google chart ได้ครับ ผมสามารถดึงข้อมูลจาก MySQL มาแสดงกราฟแท่งได้แล้วตามโค้ดนี้ แต่ต้องการแสดงเปน stack chart ไม่ทราบว่าต้องแก้ยังไงครับ
Code
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" >
<!--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>
<?php
$con=mysql_connect("localhost","root","1234") or die("Failed to connect with database!!!!");
mysql_select_db("chart", $con);
mysql_query("SET character_set_results=utf8");
mysql_query("SET character_set_client=utf8");
mysql_query("SET character_set_connection=utf8");
// The Chart table contains two fields: weekly_task and percentage
// This example will display a pie chart. If you need other charts such as a Bar chart, you will need to modify the code a little to make it work with bar chart and other charts
$sth = mysql_query("SELECT name, budget FROM personal");
/*if (!$sth) {
die("Error: ".mysql_error()); // Note: raw database errors are useless for users
// better log the error an create a "nice" error page
} */
$rows = array();
//flag is not needed
$flag = true;
$table = array();
$table['cols'] = array(
// Labels for your chart, these represent the column titles
// Note that one column is in "string" format and another one is in "number" format as pie chart only required "numbers" for calculating percentage and string will be used for column title
array('label' => 'Weekly Task', 'type' => 'string'),
array('label' => 'Percentage', 'type' => 'number')
);
$rows = array();
while($r = mysql_fetch_assoc($sth)) {
$temp = array();
// the following line will be used to slice the Pie chart
$temp[] = array('v' => (string) $r['name']);
// Values of each slice
$temp[] = array('v' => (int) $r['budget']);
$rows[] = array('c' => $temp);
}
$table['rows'] = $rows;
$jsonTable = json_encode($table);
echo $jsonTable;
?>
<script type="text/javascript">
// Load the Visualization API and the piechart package.
google.load('visualization', '1', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.setOnLoadCallback(drawChart);
function drawChart() {
// Create our data table out of JSON data loaded from server.
var data = google.visualization.arrayToDataTable(<?=$jsonTable?>);
var options = {
title: 'My Weekly Plan',
is3D: 'true',
width: 800,
height: 600,
isStacked: true
};
// Instantiate and draw our chart, passing in some options.
// Do not forget to check your div ID
var chart = new google.visualization.ColumnChart(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>
Load balance : Server 04
