I am trying to draw a line from google chart samples and when I used th data.addRows to read my data number from Mysql database it gives me Every row given must be either null or an array.
but if I put the data manually the line will draw but fetch from database table gives me error.
My code :
<script type="text/javascript">
google.charts.load('current', {'packages':['corechart', 'line']});
google.charts.setOnLoadCallback(drawLineColors);
function drawLineColors() {
var data = new google.visualization.DataTable();
data.addColumn('number', 'id');
data.addColumn('number', 'temp');
data.addColumn('number', 'hum');
data.addRows([ ['id', 'temp', 'hum']
<?php
if(mysqli_num_rows($result)>0){
while($row = mysqli_fetch_array($result)){
echo "
[".$row['id'].",".$row['temp'].",".$row['hum']."],";
}
}
?>
]);
var options = {
hAxis: {
title: 'Time'
},
vAxis: {
title: 'Popularity'
},
colors: ['#a52714', '#097138']
};
var chart = new
google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>