Chart.js is not height sensitive
I have problems to get a chart.js chart to be responsive to height as well as width.
See an example how it should work: http://www.chartjs.org/samples/latest/charts/line/basic.html
Here is my code:
var randomScalingFactor = function(){ return Math.round(Math.random()*100)};
var lineChartData = {
labels : ['January','February','March','April','May','June','July'],
datasets : [
{
label: 'My First dataset',
labelColor : '#fff',
fontColor : '#fff' ,
backgroundColor : 'rgba(220,220,220,0.2)',
borderColor : 'rgba(220,220,220,1)',
pointBackgroundColor : 'rgba(220,220,220,1)',
pointBorderColor : '#fff',
data : [randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor()]
}
]
}
var options = {
maintainAspectRatio: false,
legend: {
display: false,
},
scales: {
xAxes: [{
gridLines: {
display: false,
color: '#03A5C5',
lineWidth: 8,
},
ticks: {
fontColor: "white",
},
}],
yAxes: [{
gridLines: {
display: false,
color: '#03A5C5',
lineWidth: 8,
},
ticks: {
fontColor: "white",
beginAtZero: true,
}
}]
}
};
var ctx = document.getElementById('canvas-1');
var chart = new Chart(ctx, {
responsive: true,
type: 'line',
data: lineChartData,
options: options
});
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2 answers
Starting from Docs for Chart.js it is recommended to wrap the canvas in a container div and change the container width / height. But basically it changes either in the given width or in height.
Found a more flexible custom solution from lannymcnie that can be used for any canvas response:
var stage = new createjs.Stage("canvas");
var c = new createjs.Shape();
c.graphics.f("#f00").dc(0,0,50); // Drawn a 100x100 circle from the center
var t = new createjs.Text("Resize the browser/frame to redraw", "24px Arial bold", "#000");
t.x = t.y = 20;
stage.addChild(c, t);
window.addEventListener("resize", handleResize);
function handleResize() {
var w = window.innerWidth-2; // -2 accounts for the border
var h = window.innerHeight-2;
stage.canvas.width = w;
stage.canvas.height = h;
//
var ratio = 100/100; // 100 is the width and height of the circle content.
var windowRatio = w/h;
var scale = w/100;
if (windowRatio > ratio) {
scale = h/100;
}
// Scale up to fit width or height
c.scaleX= c.scaleY = scale;
// Center the shape
c.x = w / 2;
c.y = h / 2;
stage.update();
}
handleResize(); // First draw
html, body {
padding: 0; margin: 0;
overflow:hidden;
}
canvas {
border: 1px solid #f00;
}
<script src="https://code.createjs.com/easeljs-0.8.2.min.js"></script>
<canvas id="canvas" width="800" height="600"></canvas>
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Create Class
.chart-container {
position: relative;
margin: auto;
height: 80vh;
width: 80vw;
}
Create Div With class chart-container and place canvas tag inside it.
<div class="chart-container">
<canvas id="canvas"></canvas>
</div>
Chart options :- Use property maintainAspectRatio: false,
options: {
maintainAspectRatio: false,
responsive: true,
}
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