chart.js
Version:
Simple HTML5 charts using the canvas element.
156 lines (142 loc) • 3.73 kB
HTML
<html>
<head>
<title>Time Scale Point Data</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.13.0/moment.min.js"></script>
<script src="../../../dist/Chart.js"></script>
<script src="../../utils.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="randomizeData">Randomize Data</button>
<button id="addData">Add Data</button>
<button id="removeData">Remove Data</button>
<script>
function newDate(days) {
return moment().add(days, 'd').toDate();
}
function newDateString(days) {
return moment().add(days, 'd').format();
}
var color = Chart.helpers.color;
var config = {
type: 'line',
data: {
datasets: [{
label: "Dataset with string point data",
backgroundColor: color(window.chartColors.red).alpha(0.5).rgbString(),
borderColor: window.chartColors.red,
fill: false,
data: [{
x: newDateString(0),
y: randomScalingFactor()
}, {
x: newDateString(2),
y: randomScalingFactor()
}, {
x: newDateString(4),
y: randomScalingFactor()
}, {
x: newDateString(5),
y: randomScalingFactor()
}],
}, {
label: "Dataset with date object point data",
backgroundColor: color(window.chartColors.blue).alpha(0.5).rgbString(),
borderColor: window.chartColors.blue,
fill: false,
data: [{
x: newDate(0),
y: randomScalingFactor()
}, {
x: newDate(2),
y: randomScalingFactor()
}, {
x: newDate(4),
y: randomScalingFactor()
}, {
x: newDate(5),
y: randomScalingFactor()
}]
}]
},
options: {
responsive: true,
title:{
display:true,
text:"Chart.js Time Point Data"
},
scales: {
xAxes: [{
type: "time",
display: true,
scaleLabel: {
display: true,
labelString: 'Date'
},
ticks: {
major: {
fontStyle: "bold",
fontColor: "#FF0000"
}
}
}],
yAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'value'
}
}]
}
}
};
window.onload = function() {
var ctx = document.getElementById("canvas").getContext("2d");
window.myLine = new Chart(ctx, config);
};
document.getElementById('randomizeData').addEventListener('click', function() {
config.data.datasets.forEach(function(dataset) {
dataset.data.forEach(function(dataObj) {
dataObj.y = randomScalingFactor();
});
});
window.myLine.update();
});
document.getElementById('addData').addEventListener('click', function() {
if (config.data.datasets.length > 0) {
var numTicks = myLine.scales['x-axis-0'].ticksAsTimestamps.length;
var lastTime = numTicks ? moment(myLine.scales['x-axis-0'].ticksAsTimestamps[numTicks - 1]) : moment();
var newTime = lastTime
.clone()
.add(1, 'day')
.format('MM/DD/YYYY HH:mm');
for (var index = 0; index < config.data.datasets.length; ++index) {
config.data.datasets[index].data.push({
x: newTime,
y: randomScalingFactor()
});
}
window.myLine.update();
}
});
document.getElementById('removeData').addEventListener('click', function() {
config.data.datasets.forEach(function(dataset, datasetIndex) {
dataset.data.pop();
});
window.myLine.update();
});
</script>
</body>
</html>