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Create javascript array from php sql query for use with charts.js
I am using http://www.chartjs.org/ to create some bar charts. The data is coming from a php / sql query.
I need to get the php data into the js arrays but im not sure how.
This is as far as I have got:
I hope you can help.
Steve
I need to get the php data into the js arrays but im not sure how.
This is as far as I have got:
<script type="text/javascript">
<?php foreach ($rows as $row) {
extract($row); ?>
console.log('<?= $questionOption; ?>');
console.log('<?= $questionResponseCount; ?>');
<?php } ?>
$( document ).ready(function() {
//EXAMPLE DATA
var barData = {
labels : ["January","February","March","April","May","June"],
datasets : [
{
data : [203,156,99,251,305,247]
}
]
}
var canvas = document.getElementById('canvas').getContext('2d');
new Chart(canvas).Bar(barData);
});
</script>
I hope you can help.
Steve
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Have you tried
This might not work because the JSON structure that is output might not match what you are expecting in your JavaScript code in which case you might have to massage your PHP data.
What does your data look like in $rows - can you var_dump / print_r it so we can have a look.
echo "var data = " . json_encode($rows .';');
This might not work because the JSON structure that is output might not match what you are expecting in your JavaScript code in which case you might have to massage your PHP data.
What does your data look like in $rows - can you var_dump / print_r it so we can have a look.
This is what I get returned:
and I need questionOption and questionResponseCount.
Array ( [0] => Array ( [questionOptionID] => 60 [questionID] => 29 [questionOption] => Queen Mary [correctAnswer] => 1 [questionResponseCount] => 6 ) [1] => Array ( [questionOptionID] => 61 [questionID] => 29 [questionOption] => Queen Boudica [correctAnswer] => 0 [questionResponseCount] => 36 ) [2] => Array ( [questionOptionID] => 62 [questionID] => 29 [questionOption] => Queen Matilda [correctAnswer] => 0 [questionResponseCount] => 8 ) [3] => Array ( [questionOptionID] => 63 [questionID] => 29 [questionOption] => Queen Elizabeth I [correctAnswer] => 0 [questionResponseCount] => 3 ) )
and I need questionOption and questionResponseCount.
Here is a example for you,
<?php
$months=array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");
$datasets = array(
"dataset"=> array(
array("data" => array (10,110,210,310,410,510),
"label" => "My First dataset",
"fillColor"=> "rgba(220,220,220,0.5)",
"strokeColor"=> "rgba(220,220,220,0.8)",
"highlightFill"=> "rgba(220,220,220,0.75)",
"highlightStroke"=> "rgba(220,220,220,1)"),
array("data" => array (20,120,220,320,420,520),
"label"=> "My Second dataset",
"fillColor"=> "rgba(220,220,220,0.5)",
"strokeColor"=> "rgba(220,220,220,0.8)",
"highlightFill"=> "rgba(220,220,220,0.75)",
"highlightStroke"=> "rgba(220,220,220,1)"),
array("data" => array (30,130,230,330,430,530),
"label"=> "My Third dataset",
"fillColor"=> "rgba(220,220,220,0.5)",
"strokeColor"=> "rgba(220,220,220,0.8)",
"highlightFill"=> "rgba(220,220,220,0.75)",
"highlightStroke"=> "rgba(220,220,220,1)")
)
);
$jsonArray = array("months"=> $months, "datasets"=> $datasets);
echo json_encode($jsonArray,JSON_PRETTY_PRINT);
?>
Here is an another example, showing how to build array and then output the json
$mydata = array(
array("questionOptionID" => 10, "questionID" => 19,"questionOption" => "Question Option 1", "correctAnswer" => 1,"questionResponseCount" => 6),
array("questionOptionID" => 20, "questionID" => 29,"questionOption" => "Question Option 2", "correctAnswer" => 1,"questionResponseCount" => 10),
array("questionOptionID" => 30, "questionID" => 39,"questionOption" => "Question Option 3", "correctAnswer" => 2,"questionResponseCount" => 30),
array("questionOptionID" => 40, "questionID" => 49,"questionOption" => "Question Option 4", "correctAnswer" => 3,"questionResponseCount" => 100),
array("questionOptionID" => 50, "questionID" => 59,"questionOption" => "Question Option 5", "correctAnswer" => 3,"questionResponseCount" => 20)
);
echo json_encode($mydata,JSON_PRETTY_PRINT);
$qdata1 = array();
$qdata2 = array();
foreach ($mydata as $qdata) {
echo "<h3>" . $qdata['questionOption'] . ":" . $qdata['questionResponseCount'] . "</h3>";
array_push($qdata1,$qdata['questionOption']);
array_push($qdata2,$qdata['questionResponseCount']);
}
$jsonArray = array(
"labels"=> $qdata1,
"datasets"=> array(
"data"=>$qdata2,
"label"=> "My Third dataset",
"fillColor"=> "rgba(220,220,220,0.5)",
"strokeColor"=> "rgba(220,220,220,0.8)",
"highlightFill"=> "rgba(220,220,220,0.75)",
"highlightStroke"=> "rgba(220,220,220,1)")
);
echo json_encode($jsonArray,JSON_PRETTY_PRINT);
Firstly, not sure how the data dump you posted ties into Chart.js - did you dump the correct data? The data looks like a question structure for a survey type application.
Here is some sample code for how to get the Array data you posted into a JavaScript array - you can adapt if necessary
Here is some sample code for how to get the Array data you posted into a JavaScript array - you can adapt if necessary
<!doctype html>
<html>
<body>
<?php
$rows = array (
array (
'questionOptionID' => 60,
'questionID' => 29,
'questionOption' => "Queen Mary",
'correctAnswer' => 1,
'questionResponseCount' => 6
),
array (
'questionOptionID' => 61,
'questionID' => 29,
'questionOption' => "Queen Boudica",
'correctAnswer' => 0,
'questionResponseCount' => 36
),
array (
'questionOptionID' => 62,
'questionID' => 29,
'questionOption' => "Queen Matilda",
'correctAnswer' => 0,
'questionResponseCount' => 8
),
array (
'questionOptionID' => 63,
'questionID' => 29,
'questionOption' => "Queen Elizabeth I",
'correctAnswer' => 0,
'questionResponseCount' => 3
)
);
$json = json_encode($rows);
echo $json;
echo <<< JSCRIPT
<script>
var questions={$json};
</script>
JSCRIPT;
?>
<script>
console.log(questions);
</script>
</body>
</html>
greetings sjtinsley83 , , please notice that in Javascript you can define an Array as a comma delimited expression (NOT a string) like in your code -
203,156,99,251,305,247
I looked at your data in the DB return, and It looks like you will need to build TWO PHP strings for your chart output, the first string with be the lables of the chart bars from the DB questionOption like -
"Queen Mary","Queen Boudica","Queen Matilda","Queen Elizabeth I"
and the bar heights from DB questionResponseCount as
6,36,8,3
203,156,99,251,305,247
I looked at your data in the DB return, and It looks like you will need to build TWO PHP strings for your chart output, the first string with be the lables of the chart bars from the DB questionOption like -
"Queen Mary","Queen Boudica","Queen Matilda","Queen Elizabeth I"
and the bar heights from DB questionResponseCount as
6,36,8,3
<?php
$labels = "";
$bars = "";
foreach ($rows as $row) {
extract($row); // get the variable separations
$labels .= '"'.$questionOption.'",'; // build the lables with " and ,
$bars .= $questionResponseCount.','; // build the bars with just a ,
}
// chop off the last ,
$labels = substr($labels, 0, -1);
$bars = substr(bars, 0, -1);
?>
$( document ).ready(function() {
//EXAMPLE DATA
var barData = {
labels : [<?php echo $labels; ?>],
datasets : [
{
data : [<?php echo $bars; ?>]
}
]
}
var canvas = document.getElementById('canvas').getContext('2d');
new Chart(canvas).Bar(barData);
});
</script>
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