Chart.js annotation horizontal line on double y-axis graph - javascript

I have been looking for the mistakes I may have made in my codes but still, the horizontal line does not appear on my graph somehow. Is it because of my double y-axis graph?
Below is my code for the graph:
var canvas = document.getElementById('chart').getContext("2d");
new Chart(canvas, {
type: 'line',
data: {
labels: ['Morning 6am-12pm', 'Afternoon 12pm-4pm', 'Evening 4pm-7pm', 'Night 7pm-12am', 'Dawn 12am-6am'],
datasets: [{
label: 'Temperature',
yAxisID: 'A',
data: [30, 32, 33, 31, 30]
}, {
label: 'Humidity',
yAxisID: 'B',
data: [80, 77, 74, 79, 83],
lineTension: 0.3,
fill: false,
borderColor: 'lightblue',
backgroundColor: 'transparent',
pointBorderColor: 'lightblue',
pointBackgroundColor: 'lightgreen',
pointRadius: 5,
pointHoverRadius: 15,
pointHitRadius: 30,
pointBorderWidth: 2
}]
},
options: {
scales: {
yAxes: [{
id: 'A',
type: 'linear',
position: 'left',
}, {
id: 'B',
type: 'linear',
position: 'right',
ticks: {
max: 100,
min: 0
}
}]
},
annotation: {
annotations: [{
type: 'line',
mode: 'horizontal',
scaleID: 'y-axis-0',
value: 32,
borderColor: 'rgb(75, 0, 0)',
borderWidth: 4,
label: {
enabled: false,
content: 'Test label'
}
}]
}
}
});
And this is the result of my graph:


You've changed the ID of the y-axes to A and B:
yAxes: [{
id: 'A',
...
}, {
id: 'B',
...
In the annotation plugin configuration you tell it to draw on y-axis-0 (which is the default ID):
annotation: {
annotations: [{
scaleID: 'y-axis-0',
...
Change the configuration to whichever y-axis you want to draw the annotation to:
scaleID: 'A'
Edit: Working example with Chart.js 2.7.2
var canvas = document.getElementById('chart').getContext("2d");
new Chart(canvas, {
type: 'line',
data: {
labels: ['Morning 6am-12pm', 'Afternoon 12pm-4pm', 'Evening 4pm-7pm', 'Night 7pm-12am', 'Dawn 12am-6am'],
datasets: [{
label: 'Temperature',
yAxisID: 'A',
data: [30, 32, 33, 31, 30]
}, {
label: 'Humidity',
yAxisID: 'B',
data: [80, 77, 74, 79, 83],
lineTension: 0.3,
fill: false,
borderColor: 'lightblue',
backgroundColor: 'transparent',
pointBorderColor: 'lightblue',
pointBackgroundColor: 'lightgreen',
pointRadius: 5,
pointHoverRadius: 15,
pointHitRadius: 30,
pointBorderWidth: 2
}]
},
options: {
scales: {
yAxes: [{
id: 'A',
type: 'linear',
position: 'left',
}, {
id: 'B',
type: 'linear',
position: 'right',
ticks: {
max: 100,
min: 0
}
}]
},
annotation: {
annotations: [{
type: 'line',
mode: 'horizontal',
scaleID: 'A',
value: 32,
borderColor: 'rgb(75, 0, 0)',
borderWidth: 4,
label: {
enabled: false,
content: 'Test label'
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/chartjs-plugin-annotation/0.5.7/chartjs-plugin-annotation.js"></script>
<canvas id="chart"></canvas>

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gridLines: {
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beginAtZero: true,
stepSize: 20,
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enter image description here
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borderWidth: 1,
pointRadius: 0,
pointBorderWidth: 3,
pointHoverRadius: 3,
pointHitRadius: 3,
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label: "Median",
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pointBackgroundColor: "#0d0e25",
borderColor: '#0d0e25',
borderWidth: 1,
pointRadius: 2,
pointBorderWidth: 3,
pointHoverRadius: 3,
pointHitRadius: 3,
fill: false, //no fill here
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pointBackgroundColor: "#645bff",
borderColor: '#645bff',
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lineTension: 0.5,
pointBorderWidth: 3,
pointHoverRadius: 3,
pointHitRadius: 3,
borderCapStyle: 'butt',
borderDash: \[\],
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data: \[35, 50, 51, 55, 63, 69, 73, 80, 85, 94\]
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pointBackgroundColor: "#c4c1ff",
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borderColor: "#c4c1ff",
pointStyle: "circle",
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lineWidth: 1,
hoverRadius: 9,
pointRadius: 0,
pointBorderWidth: 3,
pointHoverRadius: 3,
pointHitRadius: 3,
lineTension: 0.3,
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data: \[25, 30, 36, 39, 45, 49, 53, 56, 60, 68\]
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\], lineAtIndex: 9
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label += ': ';
}
if (label === "25th - 75th Percentile: ") {
label = "75th Percentile: "
}
label += tooltipItem.yLabel
return label;
}
}
},
title: {
display: true,
text: 'Frontend Engineer salaries (753 datapoints)',
fontSize: 20
},
maintainAspectRatio: false,
legend: {
onClick: (e) => e.stopPropagation(),
display: true,
labels: {
filter: function(item,
mychart2) {
return !item.text.includes("25th Percentile" & "10th Percentile")
}
}
},
spanGaps: false,
elements: {
line: {
tension: 0.1
}
},
plugins: {
filler: {
propagate: false
}
},
scales: {
yAxes: \[{
gridLines: {drawOnChartArea:false
},
scaleLabel: {
display: true,
labelString: 'Salary',
fontSize: 20
},
ticks: {
beginAtZero: true,
stepSize: 20,
callback: function(value, index, values) {
return '$' + value.toFixed(decimals)
}
}
}\],
xAxes: \[{
gridLines: {drawOnChartArea:false
},
ticks: {
beginAtZero: true,
stepSize: 20,
},
scaleLabel: {
display: true,
labelString: 'Years of relevant experience',
fontSize: 20
}
}\]
}
}
};
var chart = new Chart(ctx, config)
</script>][1]

how should the vertical line look like?
do you mean the median line?
it would be helpful, if you can show us what kind of vertical line you mean, or at least tell us a function, so we know how the line should look like
EDIT:
You can add a 2nd yAxis to the right side.
Replace this for yAxes:
yAxes: [{
id: 'a',
type: 'linear',
position: 'left',
gridLines: {
drawOnChartArea:false
},
scaleLabel: {
display: true,
labelString: 'Salary',
fontSize: 20
},
ticks: {
beginAtZero: true,
stepSize: 20,
callback: function(value, index, values) {
return '$' + value.toFixed(decimals)
}
}
}, {
id: 'b',
type: 'linear',
position: 'right',
gridLines: {
drawOnChartArea:false
},
scaleLabel: {
display: false
},
ticks: {
display: false,
beginAtZero: true,
stepSize: 1
}
}]

Chart.js tooltip not show

Chart work fine butt can't see tooltips…
I cant find where problem is and what I missing…
<div style="width: 1000px; height: 600">
<canvas id="myChart" ></canvas>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>
<script>
var ctx = document.getElementById("myChart").getContext('2d');
var myNewChart = new Chart(ctx, {
type: 'line',
data: {
labels: ["24.5.2018. 15:23:48", "24.5.2018. 16:00:00", "24.5.2018. 17:00:00", ],
datasets: [{
label: '# Temperature',
fill: false,
data: [29, 25, 24, ],
backgroundColor: [
],
borderColor: [
],
borderWidth: 1
}, {
label: '# Humidity',
data: [54, 62, 64, ],
borderColor: [
],
borderWidth: 1,
fill: false,
type: 'line'
}
]
},
options: {
legend: {
display: true,
position: 'top',
labels: {
boxWidth: 80,
fontColor: 'rgb(60, 180, 100)'
}
},
tooltips: {
cornerRadius: 4,
caretSize: 4,
xPadding: 16,
yPadding: 10,
backgroundColor: 'rgba(0, 150, 100, 0.9)',
titleFontStyle: 'normal',
titleMarginBottom: 15
}
}
});
</script>
Helper seed that I need add more text for posting this but dont konw how simple question make longer…. text text Helper seed that I need add more text for posting this but dont konw how simple question make longer….

Try this one
<div style="width: 1000px; height: 600">
<canvas id="myChart"></canvas>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>
<script>
var ctx = document.getElementById("myChart").getContext('2d');
var myNewChart = new Chart(ctx, {
type: 'line',
data: {
labels: ["24.5.2018. 15:23:48", "24.5.2018. 16:00:00", "24.5.2018. 17:00:00", ],
datasets: [{
label: '# Temperature',
fill: false,
data: [29, 25, 24, ],
borderWidth: 1
}, {
label: '# Humidity',
data: [54, 62, 64, ],
borderWidth: 1,
fill: false,
type: 'line'
}]
},
options: {
legend: {
display: true,
position: 'top',
labels: {
boxWidth: 80,
fontColor: 'rgb(60, 180, 100)'
}
},
tooltips: {
cornerRadius: 4,
caretSize: 4,
xPadding: 16,
yPadding: 10,
backgroundColor: 'rgba(0, 150, 100, 0.9)',
titleFontStyle: 'normal',
titleMarginBottom: 15
}
}
});
</script>
Just remove backgroundColor: [] and borderColor: [] from both datasets

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