I want to hide legends in Chart.js in label and tooltips.
I am using v2.5.0
I am trying this way but its not hiding legend in tooltips
<canvas id="myChart" width="400" height="250"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<script>
window.onload = function(e){
var ctx = document.getElementById("myChart").getContext("2d");
var data = {
labels: ["January", "February", "March", "April", "May", "June1", "July"],
datasets: [
{
fill: false,
lineTension: 0.3,
pointRadius: 15,
pointHitRadius: 15,
pointHoverRadius: 15,
data: [65, 59, 80, 81, 56, 55, 40],
spanGaps: false,
}
]
};
var options={
legend: {
display: false
},
tooltips: {
callbacks: {
label: function(tooltipItem, data) {
return tooltipItem.yLabel;
}
}
}
};
var myLineChart = new Chart(ctx, {
type: 'line',
data: data,
options: options
});
}
</script>
jsfiddle
I have also tried in global values like this
Chart.defaults.global.legend= false;
But legends are still shown in tooltips, Please see and suggest any possible way to do this.
Thanks
I found the solution by adding displayColors:false in tooltips option like this
tooltips: {
displayColors:false,
callbacks: {
label: function(tooltipItem) {
return tooltipItem.yLabel;
}
}
}
Now the legend are not shown, I hope it helps someone with similar issue.
Related
I create charts for weather. I want to show automatically the tooltip on the last datapoint, when the chart is created. When the mouse is moved to another datapoint, the tootip should move to the new datapoint of the mouse or vanish if the mouse is outside.
https://www.chartjs.org/docs/3.8.0/samples/advanced/programmatic-events.html ist very close. Thanks!
function triggerTooltip(chart) {
const tooltip = chart.tooltip;
if (tooltip.getActiveElements().length > 0)
{ tooltip.setActiveElements([], {x: 0, y: 0}); }
else {
const chartArea = chart.chartArea;
tooltip.setActiveElements([
{
datasetIndex: 0,
index: 0,
}, {
datasetIndex: 1,
index: 0,
}],
{ x: (chartArea.left + chartArea.right) / 2,
y: (chartArea.top + chartArea.bottom) / 2, });
}
chart.update(); }
I did expect that the index controlls the bar, for the tooltip. But it makes no difference, whatever Index is set.
Also when I change x,y it is still on the same place (close to 3rd bar).
enter image description here
This can be done with the Plugin Core API in the afterDatasetUpdate hook as follows:
afterDatasetUpdate: chart => {
if (!chart.tooltip.getActiveElements().length) {
chart.tooltip.setActiveElements([{
datasetIndex: 0,
index: chart.data.datasets[0].data.length - 1
}]);
chart.update();
}
}
Please take a look at the runnable code snippet below and see how it works.
new Chart('myChart', {
type: 'line',
plugins: [{
afterDatasetUpdate: chart => {
if (!chart.tooltip.getActiveElements().length) {
chart.tooltip.setActiveElements([{
datasetIndex: 0,
index: chart.data.datasets[0].data.length - 1
}]);
chart.update();
}
}
}],
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: '# of Events',
data: [65, 59, 80, 81, 56, 55, 68],
borderColor: '#a00'
}]
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.7.1/chart.min.js"></script>
<canvas id="myChart" width="400" height="95"></canvas>
thanks - it is exactly, what I am looking for!
The snippet in your answer works with visible tooltip on the last data point.
When I try it in test.html in my browser (I tested firefox, edge,chrome) the tooltip is not visible.
Where is the mistake in my test.html?
<!DOCTYPE html>
<html>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.7.1/chart.min.js"></script>
<canvas id="myChart" width="400" height="95"></canvas>
<script type="text/javascript">
new Chart('myChart', {
type: 'line',
plugins: [{
afterDatasetUpdate: chart => {
if (!chart.tooltip.getActiveElements().length) {
chart.tooltip.setActiveElements([{
datasetIndex: 0,
index: chart.data.datasets[0].data.length - 1
}]);
chart.update();
}
}
}],
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: '# of Events',
data: [65, 59, 80, 20, 81, 56, 55, 68],
borderColor: '#a00'
}]
}
});
</script>
</body>
</html>
that is my test:
https://www.zebrafell.de/test.html
I have chartjs v2.9.3 in my Django app and it works great. Now I need to add a box to one of my charts using chartjs-plugin-annotation, and I've followed all the steps, but I can't get it to work.
I've used chartjs-plugin-annotation v0.5.7 which is for v2.9.3. I get no errors in the console log.
First, scripts with chart.js and plugins:
<script src="https://cdn.jsdelivr.net/npm/chart.js#2.9.3/dist/Chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels#0.7.0"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-annotation#0.5.7/chartjs-plugin-annotation.min.js"></script>
My code for chart (chart works, I just can't get box to appear):
<canvas id="myChart" height="250"></canvas>
<script>
function setChart12(){
$('#myChart').remove();
$('#container_glavni').append('<canvas id="myChart" height="200"></canvas>');
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: date,
datasets: [{
label: 'Number of reports',
data: data_nc
}, {
type: 'line',
label: 'Median',
data: [50],
fill: false,
borderColor: 'rgb(54, 162, 235)',
}],
},
options: {
layout: {
padding: {
top: 30
}
},
responsive: true,
legend: {
display: false
},
plugins: {
datalabels: {
anchor: 'end',
align: 'end',
offset: 5,
},
autocolors: false,
annotation: {
annotations: {
box1: {
type: 'box',
xMin: 0,
xMax: 1,
yMin: 0,
yMax: 30,
backgroundColor: 'rgba(255, 99, 132, 0.25)'}
}
}
},
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});}
</script>
I've tried:
Different values for min and max
Different colors
Different code formating
This is because you putted the options in the place where they belong in V1 of the annotation plugin and the syntax too. For V0.5.7 the annotation options have to be placed in the root of the options and also all the annotations are an array instead of seperate objects:
var options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderWidth: 1
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderWidth: 1
}
]
},
options: {
annotation: {
annotations: [{
id: "hline",
type: "line",
mode: "horizontal",
scaleID: "y-axis-0",
value: 10,
borderColor: "red",
}]
},
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-annotation#0.5.7/chartjs-plugin-annotation.min.js"></script>
</body>
I have searched through for the solution but I have found solution to pie charts only. For example this one : Chart.js v2: How to make tooltips always appear on pie chart?
I just want make the tooltip visible without hovering. I have tried registering new pluginService but its not working and its producing this error
Uncaught TypeError: Cannot read property 'call' of undefined
this is what I have so far
Chart.pluginService.register({
beforeRender: function (chart) {
if (chart.config.options.showAllTooltips) {
// create an array of tooltips
// we can't use the chart tooltip because there is only one tooltip per chart
chart.pluginTooltips = [];
chart.config.data.datasets.forEach(function (dataset, i) {
chart.getDatasetMeta(i).data.forEach(function (sector, j) {
chart.pluginTooltips.push(new Chart.Tooltip({
_chart: chart.chart,
_chartInstance: chart,
_data: chart.data,
_options: chart.options,
_active: [sector]
}, chart));
});
});
// turn off normal tooltips
chart.options.tooltips.enabled = false;
}
},
afterDraw: function (chart, easing) {
if (chart.config.options.showAllTooltips) {
// we don't want the permanent tooltips to animate, so don't do anything till the animation runs atleast once
if (!chart.allTooltipsOnce) {
if (easing !== 1)
return;
chart.allTooltipsOnce = true;
}
// turn on tooltips
chart.options.tooltips.enabled = true;
Chart.helpers.each(chart.pluginTooltips, function (tooltip) {
tooltip.initialize();
tooltip.update();
// we don't actually need this since we are not animating tooltips
tooltip.pivot();
tooltip.transition(easing).draw();
});
chart.options.tooltips.enabled = false;
}
}
})
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: "My First dataset",
fillColor: "rgba(220,220,220,0.2)",
strokeColor: "rgba(220,220,220,1)",
pointColor: "rgba(220,220,220,1)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(220,220,220,1)",
data: [65, 59, 80, 81, 56, 55, 40]
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
},
showAllTooltips: true
}
});
appreciate any helps tq
When using the latest stable version of Chart.js (2.9.3), it works with the following changes.
Instead of Chart.pluginService.register, use Chart.plugin.register
Instead of change _options : chart.options write _options : chart.options.tooltips
Please have a look at your amended code below.
Chart.plugins.register({
beforeRender: function(chart) {
if (chart.config.options.showAllTooltips) {
// create an array of tooltips,
// we can't use the chart tooltip because there is only one tooltip per chart
chart.pluginTooltips = [];
chart.config.data.datasets.forEach(function(dataset, i) {
chart.getDatasetMeta(i).data.forEach(function(sector, j) {
chart.pluginTooltips.push(new Chart.Tooltip({
_chart: chart.chart,
_chartInstance: chart,
_data: chart.data,
_options: chart.options.tooltips,
_active: [sector]
}, chart));
});
});
chart.options.tooltips.enabled = false; // turn off normal tooltips
}
},
afterDraw: function(chart, easing) {
if (chart.config.options.showAllTooltips) {
if (!chart.allTooltipsOnce) {
if (easing !== 1) {
return;
}
chart.allTooltipsOnce = true;
}
chart.options.tooltips.enabled = true;
Chart.helpers.each(chart.pluginTooltips, function(tooltip) {
tooltip.initialize();
tooltip.update();
tooltip.pivot();
tooltip.transition(easing).draw();
});
chart.options.tooltips.enabled = false;
}
}
});
new Chart("chart", {
type: 'line',
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: "My First dataset",
fillColor: "rgba(220,220,220,0.2)",
strokeColor: "rgba(220,220,220,1)",
pointColor: "rgba(220,220,220,1)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(220,220,220,1)",
data: [65, 59, 80, 81, 56, 55, 40]
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
},
showAllTooltips: true
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="chart" height="100"></canvas>
I'm using Chart.js to display some data using a bar chart.
My question is whether there is a way to extract the text of the tooltip and show it on a different div, so whenever I hover the bar chart I get the label and the value hovered in another place of the page.
I managed to alert the label or the value using the alert(label) function. but when I use the $('#mydiv').text(label) function, It does not work.
Here is my code :
<canvas id="widgetChart4"></canvas>
<id id="myDiv"></id>
<script>
var ctx = document.getElementById( "widgetChart4" );
ctx.height=50;
ctx.width=250;
var myChart = new Chart( ctx, {
type: 'bar',
data:
{
labels: [ "January", "February", "March", "April", "May", "June",
"July" ],
datasets: [
{
label: false,
data: [ 16, 32, 18, 26, 42, 33, 44 ]
}
]
},
options:
{
responsive: true,
tooltips:
{
callbacks:
{
label: function(tooltipItem, data) {
//this is working
alert( data['datasets'][0]['data'][tooltipItem['index']]);
//this is not working
$("#myDiv").text(data['datasets'][0]['data']
[tooltipItem['index']]);
return data['datasets'][0]['data'][tooltipItem['index']];
},
}
}
}
});
</script>
I managed to alert the label or the value using the alert(label)
function. but when I use the $('#mydiv').text(label) function, It does
not work.
I ran your code and it works perfectly so one possible reason why it's not working on your side is that you didn't import jQuery in your code.
var ctx = document.getElementById("widgetChart4");
ctx.height = 50;
ctx.width = 250;
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["January", "February", "March", "April", "May", "June",
"July"
],
datasets: [{
label: false,
data: [16, 32, 18, 26, 42, 33, 44]
}]
},
options: {
responsive: true,
tooltips: {
callbacks: {
label: function(tooltipItem, data) {
$('#myDiv').html(data['datasets'][0]['data']
[tooltipItem['index']]);
return data['datasets'][0]['data'][tooltipItem['index']];
},
}
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>
<canvas id="widgetChart4"></canvas>
<div id="myDiv"></div>
I saw your post regarding,
Instead of just "Stock" at the left, is there anyway to put a separate label for each bar, eg 18, 82, 22, 80 going down the y-axis?
Below is the link which I'm referring ...
ChartJS bar chart with legend which corresponds to each bar
You are looking for something like the following:
var chart = new Chart(ctx, {
type: 'horizontalBar',
data: {
labels: [18, 82, 22, 80],
datasets: [{
data: [1, 2, 3, 4],
backgroundColor: ['#ff6384', '#36a2eb', '#ffce56', '#4bc0c0', '#9966ff'],
borderColor: ['#ff6384', '#36a2eb', '#ffce56', '#4bc0c0', '#9966ff']
}]
},
options: {
scales: {
xAxes: [{
ticks: {
beginAtZero: true
}
}]
},
legend: {
labels: {
generateLabels: function(chart) {
var labels = chart.data.labels;
var dataset = chart.data.datasets[0];
var legend = labels.map(function(label, index) {
return {
datasetIndex: 0,
text: label,
fillStyle: dataset.backgroundColor[index],
strokeStyle: dataset.borderColor[index],
lineWidth: 1
}
});
return legend;
}
}
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="ctx"></canvas>