JSON Question
charts.js - json output to graph
I want to dispay in a bar graph the days and the quantity.
I have following json output.(data.php) for each day the quantity.
[{"day":"2017-11-15","quantity":"72"},{"day":"2017-11-16","quantity":"157"},{"day":"2017-11-17","quantity":"130"},{"day":"2017-11-18","quantity":"91"},{"day":"2017-11-19","quantity":"96"}]
output.html
<!DOCTYPE html>
<html>
<head>
<title>ChartJS - BarGraph</title>
<style type="text/css">
#chart-container {
width: 640px;
height: auto;
}
</style>
</head>
<body>
<div id="chart-container">
<canvas id="mycanvas"></canvas>
</div>
<!-- javascript -->
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript" src="js/Chart.min.js"></script>
<script type="text/javascript" src="js/app.js"></script>
</body>
and thats the app.js
$(document).ready(function(){
$.ajax({
url: "data.php",
method: "GET",
success: function(data) {
console.log(data);
var day = [];
var quantity = [];
for(var i in data) {
day.push(data[i].day);
quantity.push(data[i].quantity);
}
var chartdata = {
labels: day,
datasets : [
{
label: 'DAYS',
backgroundColor: 'rgba(200, 200, 200, 0.75)',
borderColor: 'rgba(200, 200, 200, 0.75)',
hoverBackgroundColor: 'rgba(200, 200, 200, 1)',
hoverBorderColor: 'rgba(200, 200, 200, 1)',
data: quantity
}
]
};
var ctx = $("#mycanvas");
var barGraph = new Chart(ctx, {
type: 'bar',
data: chartdata
});
},
error: function(data) {
console.log(data);
}
});
});
but it's always empty. but why? Any idea? Also instead of the day theres only undefined on the bottom line.
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Answer Source
Here is the main idea
data.forEach(function(packet) {
labelsData.push(packet.day);
datasetData.push(parseFloat(packet.quantity));
});
for example
var dataJSON = [{
"day": "2017-11-15",
"quantity": "72"
}, {
"day": "2017-11-16",
"quantity": "157"
}, {
"day": "2017-11-17",
"quantity": "130"
}, {
"day": "2017-11-18",
"quantity": "91"
}, {
"day": "2017-11-19",
"quantity": "96"
}];
var labelsData = [];
var datasetData = [];
dataJSON.forEach(function(packet) {
labelsData.push(packet.day);
datasetData.push(parseFloat(packet.quantity));
});
var chartdata = {
type: 'bar',
data: {
labels: labelsData,
datasets: [{
label: 'DAYS',
data: datasetData
}]
}
}
Working JSFiddle
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