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chart.test.html
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chart.test.html
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<!doctype html>
<html>
<head>
<title>Chart Test</title>
<script src="https://www.chartjs.org/dist/2.7.3/Chart.bundle.js"></script>
<script src="https://www.chartjs.org/samples/latest/utils.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<style>
canvas{
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
</style>
</head>
<body>
<div style="width:75%;">
<canvas id="canvas"></canvas>
</div>
<br>
<br>
<button id="addData">Add Data</button>
<script>
var labels = [];
var data = [];
var config = {
type: 'line',
data: {
labels: labels,
datasets: [{
label: 'Relationship dataset',
backgroundColor: window.chartColors.red,
borderColor: window.chartColors.red,
data: data,
fill: false,
}]
},
options: {
responsive: true,
title: {
display: true,
text: 'Relationship Line Chart'
},
tooltips: {
mode: 'index',
intersect: false,
},
hover: {
mode: 'nearest',
intersect: true
},
scales: {
xAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Date'
}
}],
yAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Good/Bad'
}
}]
}
}
};
window.onload = function() {
var ctx = document.getElementById('canvas').getContext('2d');
window.myLine = new Chart(ctx, config);
$.getJSON('https://huangyaping.github.io/lifedata/relationship.json?callback=pr', function(data){
for (var i = 0; i < data.length; i++) {
config.data.labels.push(data[i][0]);
config.data.datasets[0].data.push(data[i][1]);
}
window.myLine.update();
});
};
document.getElementById('addData').addEventListener('click', function() {
if (config.data.datasets.length > 0) {
config.data.labels.push(config.data.labels.length+1);
config.data.datasets.forEach(function(dataset) {
dataset.data.push(Math.floor(Math.random()*10-1));
});
window.myLine.update();
}
});
</script>
</body>
</html>