Google Pie charts from custom mysqli query
Question
I was trying to implement google charts using php, mysqli. I want to make a Pie chart with 3 slices for a Lesson-Activity and the 3slices are the three columns : count(<50%), count(Between 50-60%), count(>60%). I tried searching with different program, tried from different possibilities from my end, but couldn't get with this kind of requirement. I couldn't add more than two columnns in my code.
Requirement : I was looking for a Pie chart with lesson_activity showing all the three columns: cond1, cond2 and cond3 (in one piechart).
I came to stack overflow to share my code with high qualified developers.
Kindly share your suggestions.
TABLE : lesson_grades
id lesson lesson_activity count(<50%) count(Between 50-60%) count(>60%)
5 Community Health Care CHC.001 9 7 2
5 Community Health Care CHC.002 2 5 6
5 Community Health Care CHC.003 9 2 0
13 Spaceship SS.001 1 13 7
3 Risk Analysis RA.001 1 13 7
3 Risk Analysis RA.002 1 9 0
3 Risk Analysis RA.003 1 3 4
3 Risk Analysis RA.004 0 7 21
3 Risk Analysis RA.005 0 30 11
15 Community Qualifications CA.001 1 13 32
CODE
<?php
$DB_NAME = 'lessons';
$DB_HOST = 'localhost';
$DB_USER = '---';
$DB_PASS = '---';
$mysqli = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);
if (mysqli_connect_errno())
{
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$sql = $mysqli->query('SELECT id, lesson, lesson_activity, count(<50%) AS cond1, count(Between 50-60%) AS cond2, count(>60%) AS cond3 FROM lesson_grades');
$rows = array();
$flag = true;
$table = array();
$table['cols'] = array(
array('label' => 'lesson_activity', 'type' => 'string'),
array('label' => 'cond1', 'type' => 'number'),
array('label' => 'cond2', 'type' => 'number'),
array('label' => 'cond3', 'type' => 'number'),
);
$rows = array();
while($r = mysqli_fetch_assoc($sql))
{
$temp = array();
$temp[] = array('v' => (string) $r['lesson_activity']);
$temp[] = array('v' => $r['cond1'], $r['cond2'], $r['cond3']);
$rows[] = array('c' => $temp);
}
$table['rows'] = $rows;
$jsonTable = json_encode($table);
echo $jsonTable;
?>
<html>
<head>
<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">
google.load('visualization', '1', {'packages':['corechart']});
google.setOnLoadCallback(drawChart);
function drawChart()
{
var data = new google.visualization.DataTable(<?php echo $jsonTable; ?>);
var options =
{
title: 'My Weekly Plan',
legend: 'none',
slices: {0: {color: 'black'}, 1: {color: 'red'}}
};
var chart = new google.visualization.PieChart(document.getElementById('piechart'));
chart.draw(data, options);
}
</script>
</head>
<body><div id="piechart" style="width:500px;height:500px;"></div></body>
</html>
1 answers
solution1
2 ACCPTED 2015-08-18 07:16:40
I'm sure someone will give you a pure javascript version, but here is a class that works with php that will auto-generate the javascript if you are interested. If not the bottom most code is the output to try:
Library:
Update: https://github.com/rasclatt/PHP-to-Google-PieCharts-Converter
<?php
class GoogleCharts
{
public $newArr;
public $VarName;
public $DataArray;
public $options;
protected $id;
protected $compiler;
protected $chartType;
const PIE = 'pie';
const SCATTER = 'scatter';
public function __construct()
{
$this->options = array("title"=>"Untitled");
$this->chartType = 'pie';
}
function CreatePie($settings = false)
{
if(!is_array($settings))
return;
$data = (!empty($settings['data']))? $settings['data']:false;
$this->id = (!empty($settings['id']))? $settings['id']:false;
$incr = (!empty($settings['incr']))? $settings['incr']:false;
$this->VarName = "";
$this->newArr = array();
if($data != false && $this->id != false) {
foreach($data as $key => $value) {
$dvalue = (is_numeric($value))? $value:"'{$value}'";
$key = (is_numeric($key))? $key:"'{$key}'";
$this->newArr[] = "\t\t\t\t\t[{$key}, {$dvalue}]";
}
}
$this->VarName = "DataSet{$incr}";
if(!empty($this->newArr)) {
$str = PHP_EOL."var {$this->VarName} = [".PHP_EOL;
$str .= implode(",".PHP_EOL,$this->newArr).PHP_EOL;
$str .= "\t\t\t\t]".PHP_EOL;
}
$this->DataArray = (!empty($str))? $str:false;
return $this;
}
public function ChartData()
{
$str = (!empty($this->DataArray))? $this->DataArray:"";
$str .= PHP_EOL;
return $str;
}
protected function MakeJSObjects($arr)
{
if(is_array($arr)) {
foreach($arr as $k => $v) {
$return[$k] = $k.': '.$this->MakeJSObjects($v);
}
}
else {
$arr = (is_numeric($arr) || $arr === 'true' || $arr === 'false')? $arr: "'$arr'";
$return = (strpos($arr,'{') !== false && strpos($arr,'}') !== false)? trim($arr,"'") : $arr;
}
return (is_array($return))? '{ '.PHP_EOL."\t".implode(",\t".PHP_EOL."\t",$return).PHP_EOL.' }' : $return;
}
public function ChartOptions($opts)
{
if(!is_array($opts))
return $this;
$this->options = "\t\tvar options =".$this->MakeJSObjects($opts).";";
return $this;
}
public function ChartInstance()
{
$str = (!empty($this->VarName))? "drawChart({$this->VarName},'{$this->id}');":"";
$str .= PHP_EOL;
return $str;
}
public function CreateJavascript($settings = false)
{
$library = (!empty($settings['lib']))? $settings['lib']:false;
$wrap = (!empty($settings['wrap']))? $settings['wrap']:false;
$wrap = (!empty($settings['data']) && is_array($settings['data']))? $settings['data']:array();
if($library)
$comp[] = '<script type="text/javascript" src="https://www.google.com/jsapi?autoload={\'modules\':[{\'name\':\'visualization\',\'version\':\'1.1\',\'packages\':[\'corechart\']}]}"></script>'.PHP_EOL;
if($wrap)
$comp[] = '<script type="text/javascript">'.PHP_EOL;
$comp[] = '
google.load("visualization", "1", {packages:["corechart"]});
// Let the callback run a function
google.setOnLoadCallback(function() {';
for($i = 0; $i < count($settings['data']); $i++) {
$comp[] = $settings['data'][$i].PHP_EOL;
}
$comp[] = '
});
// Give the function some arguments, first is data, second id
// You could do a third for the options attribute
function drawChart(ArrayElem,IdElem)
{
var data = google.visualization.arrayToDataTable(ArrayElem);'.PHP_EOL;
if(!empty($this->options))
$comp[] = $this->options;
$comp[] = '
var chart = new google.visualization.'.$this->chartType.'(document.getElementById(IdElem));
chart.draw(data, options);
}';
if($wrap)
$comp[] = PHP_EOL.'</script>'.PHP_EOL;
return implode("",$comp);
}
public function ChartKind($type = 'pie')
{
switch($type) {
case('scatter'):
$this->chartType = 'ScatterChart';
break;
default:
$this->chartType = 'PieChart';
}
return $this;
}
}
?>
To use:
<html>
<head>
<?php
// Settings for the first chart
// This is so you can make multiple charts
$settings["incr"] = 1;
// Id name for the chart (where to put the chart)
$settings["id"] = "piechart".$settings["incr"];
$settings["data"]["Task"] = "Lessons/Activity";
//**********************************//
// Your numbers from your db go here
//**********************************//
$settings["data"]['count(<50%)'] = 7;
$settings["data"]['count(Between 50-60%)'] = 3;
$settings["data"]['count(>60%)'] = 6;
//**********************************//
//**********************************//
// Create instance of GoogleCharts class
$Googlizer = new GoogleCharts();
// Create the pie chart
$Googlizer->CreatePie($settings);
// Save the instance of the js data array
$chart1_data = $Googlizer->ChartData();
// Save the instance of the js function
$chart1_inst = $Googlizer->ChartInstance();
// Write the whole shebangle to the page
echo $Googlizer ->ChartOptions(array("title"=>"My Weekly Plan","legend"=>"none"))
->ChartKind(GoogleCharts::PIE)
->CreateJavascript(array("data"=>array($chart1_data, $chart1_inst),"wrap"=>true,"lib"=>true));
?>
</head>
<body>
<div id="piechart1" style="width: 900px; height: 500px;"></div>
</body>
</html>
Gives you:
<html>
<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load("visualization", "1", {packages:["corechart"]});
// Let the callback run a function
google.setOnLoadCallback(function() {
var DataSet1 = [
['Task', 'Lessons/Activity'],
['count(<50%)', 7],
['count(Between 50-60%)', 3],
['count(>60%)', 6]
]
drawChart(DataSet1,'piechart1');
});
// Give the function some arguments, first is data, second id
// You could do a third for the options attribute
function drawChart(ArrayElem,IdElem)
{
var data = google.visualization.arrayToDataTable(ArrayElem);
var options = {
title: 'My Weekly Plan',
legend: 'none'
};
var chart = new google.visualization.PieChart(document.getElementById(IdElem));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="piechart1" style="width: 900px; height: 500px;"></div>
</body>
</html>
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