The following chart is from a sample I found in the samples/timeScale folder of Chart.js Github repository. As far as I understand, the bundle version of Chart.js should include the moment.js as well. But I could not make the following code to work, without adding the moment.js from a CDN.
If you now how to make the bundled version to work, without using moment.min.js, please let me know to update the code.
Using our plugin, named Blazing Charts, I added the following shortcode to this post:
[BlazingChart charttype="chartjs" source="a Chart Snippet" options="bundle"]
The script saved as a Chart Snippet is as following:
<script src="//cdnjs.cloudflare.com/ajax/libs/moment.js/2.13.0/moment.min.js"></script>
<style>
canvas {
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
</style>
<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>
window.onload = function() {
function randomScalingFactor() {
return Math.round(Math.random() * 100 * (Math.random() > 0.5 ? -1 : 1));
}
function randomColorFactor() {
return Math.round(Math.random() * 255);
}
function randomColor(opacity) {
return 'rgba(' + randomColorFactor() + ',' + randomColorFactor() + ',' + randomColorFactor() + ',' + (opacity || '.3') + ')';
}
function newDate(days) {
return moment().add(days, 'd').toDate();
}
function newDateString(days) {
return moment().add(days, 'd').format();
}
var config = {
type: 'line',
data: {
datasets: [{
label: "Dataset with string point data",
data: [{
x: newDateString(0),
y: randomScalingFactor()
}, {
x: newDateString(2),
y: randomScalingFactor()
}, {
x: newDateString(4),
y: randomScalingFactor()
}, {
x: newDateString(5),
y: randomScalingFactor()
}],
fill: false
}, {
label: "Dataset with date object point data",
data: [{
x: newDate(0),
y: randomScalingFactor()
}, {
x: newDate(2),
y: randomScalingFactor()
}, {
x: newDate(4),
y: randomScalingFactor()
}, {
x: newDate(5),
y: randomScalingFactor()
}],
fill: false
}]
},
options: {
responsive: true,
title:{
display:true,
text:"Chart.js Time Point Data"
},
scales: {
xAxes: [{
type: "time",
display: true,
scaleLabel: {
display: true,
labelString: 'Date'
}
}],
yAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'value'
}
}]
}
}
};
jQuery.each(config.data.datasets, function(i, dataset) {
dataset.borderColor = randomColor(0.4);
dataset.backgroundColor = randomColor(0.5);
dataset.pointBorderColor = randomColor(0.7);
dataset.pointBackgroundColor = randomColor(0.5);
dataset.pointBorderWidth = 1;
});
jQuery('#randomizeData').click(function() {
jQuery.each(config.data.datasets, function(i, dataset) {
jQuery.each(dataset.data, function(j, dataObj) {
dataObj.y = randomScalingFactor();
});
});
window.myLine.update();
});
jQuery('#addData').click(function() {
if (config.data.datasets.length > 0) {
var lastTime = myLine.scales['x-axis-0'].labelMoments[0].length ? myLine.scales['x-axis-0'].labelMoments[0][myLine.scales['x-axis-0'].labelMoments[0].length - 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();
}
});
jQuery('#removeData').click(function() {
config.data.datasets.forEach(function(dataset, datasetIndex) {
dataset.data.pop();
});
window.myLine.update();
});
var ctx = document.getElementById("canvas").getContext("2d");
window.myLine = new Chart(ctx, config);
};
</script>
wow – thanks so much. this saved me. i wish the chart.js documentation mentioned this more clearly.
This is a very useful example missing from chartJs documentation.
Thank you very much!