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line-skip-points.html
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Sun, Aug 18, 17:17

line-skip-points.html
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<!doctype html>
<html>
<head>
<title>Line Chart</title>
<script src="../dist/Chart.bundle.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/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="randomizeData">Randomize Data</button>
<button id="addDataset">Add Dataset</button>
<button id="removeDataset">Remove Dataset</button>
<button id="addData">Add Data</button>
<button id="removeData">Remove Data</button>
<script>
var MONTHS = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
var randomScalingFactor = function() {
return Math.round(Math.random() * 100);
//return 0;
};
var randomColorFactor = function() {
return Math.round(Math.random() * 255);
};
var randomColor = function(opacity) {
return 'rgba(' + randomColorFactor() + ',' + randomColorFactor() + ',' + randomColorFactor() + ',' + (opacity || '.3') + ')';
};
var config = {
type: 'line',
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: "My First dataset",
// Skip a point in the middle
data: [randomScalingFactor(), randomScalingFactor(), NaN, randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor()],
fill: true,
borderDash: [5, 5],
}, {
label: "My Second dataset",
// Skip first and last points
data: [NaN, randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), NaN],
}]
},
options: {
responsive: true,
title:{
display:true,
text:'Chart.js Line Chart - Skip Points'
},
tooltips: {
mode: 'label',
},
hover: {
mode: 'label'
},
scales: {
xAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Month'
}
}],
yAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Value'
},
}]
}
}
};
$.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;
});
window.onload = function() {
var ctx = document.getElementById("canvas").getContext("2d");
window.myLine = new Chart(ctx, config);
};
$('#randomizeData').click(function() {
$.each(config.data.datasets, function(i, dataset) {
dataset.data = dataset.data.map(function() {
return randomScalingFactor();
});
});
window.myLine.update();
});
$('#addDataset').click(function() {
var newDataset = {
label: 'Dataset ' + config.data.datasets.length,
borderColor: randomColor(0.4),
backgroundColor: randomColor(0.5),
pointBorderColor: randomColor(0.7),
pointBackgroundColor: randomColor(0.5),
pointBorderWidth: 1,
data: [],
};
for (var index = 0; index < config.data.labels.length; ++index) {
newDataset.data.push(randomScalingFactor());
}
config.data.datasets.push(newDataset);
window.myLine.update();
});
$('#addData').click(function() {
if (config.data.datasets.length > 0) {
var month = MONTHS[config.data.labels.length % MONTHS.length];
config.data.labels.push(month);
$.each(config.data.datasets, function(i, dataset) {
dataset.data.push(randomScalingFactor());
});
window.myLine.update();
}
});
$('#removeDataset').click(function() {
config.data.datasets.splice(0, 1);
window.myLine.update();
});
$('#removeData').click(function() {
config.data.labels.splice(-1, 1); // remove the label first
config.data.datasets.forEach(function(dataset, datasetIndex) {
dataset.data.pop();
});
window.myLine.update();
});
</script>
</body>
</html>

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