I am trying to create a line chart with two datasets, each with its own Y scale / axis (one to the left, one to the right of the graph) using Chart.js.
This is my code (jsfiddle):
var canvas = document.getElementById('chart');
new Chart(canvas, {
type: 'line',
data: {
labels: [ '1', '2', '3', '4', '5' ],
datasets: [
{
label: 'A',
yAxesGroup: 'A',
data: [ 100, 96, 84, 76, 69 ]
},
{
label: 'B',
yAxesGroup: 'B',
data: [ 1, 1, 1, 1, 0 ]
}
]
},
options: {
yAxes: [
{
name: 'A',
type: 'linear',
position: 'left',
scalePositionLeft: true
},
{
name: 'B',
type: 'linear',
position: 'right',
scalePositionLeft: false,
min: 0,
max: 1
}
]
}
});
However, the second axis is not visible and the second dataset is still scaled exactly as the first (0 to 100 instead of 0 to 1). What do I need to change?
For ChartJs 2.x only a couple changes need to be made (it looks like you have tried to combine 2.x options with the multi-axes options from my fork?),
yAxes
field needs to be in a scales
objectticks
object. scalePositionLeft
this is covered by position
Example:
var canvas = document.getElementById('chart');
new Chart(canvas, {
type: 'line',
data: {
labels: ['1', '2', '3', '4', '5'],
datasets: [{
label: 'A',
yAxisID: 'A',
data: [100, 96, 84, 76, 69]
}, {
label: 'B',
yAxisID: 'B',
data: [1, 1, 1, 1, 0]
}]
},
options: {
scales: {
yAxes: [{
id: 'A',
type: 'linear',
position: 'left',
}, {
id: 'B',
type: 'linear',
position: 'right',
ticks: {
max: 1,
min: 0
}
}]
}
}
});