I'm using charts.js. For my current need, I managed to find a way to configure tooltips to be always visible regardless of the hover event. My problem is that the tooltip visibility does not follow the dataset behaviour. On charts.js, you can click on a dataset in order to remove it from the graph. My graph does that, but the tooltips are still there visible, floating within the graph with no dataset to represent. Is there a way to hide then with the dataset data when the label is clicked ?
Here is an example of the current state of what i said. https://jsfiddle.net/CaioSantAnna/ddejheg0/ .
HTML
<canvas id="linha"></canvas>
Javascript
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));
});
});
// 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;
}
}
});
ctx = document.getElementById("linha");
var linha = new Chart(ctx, {
type: 'line',
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
fill: true,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [65, 59, 80, 81, 56, 55, 40],
spanGaps: false,
responsive: true,
animation: true,
},
{
label: "Second dataset",
fill: true,
lineTension: 0.1,
backgroundColor: "rgba(0,0,0,0.4)",
borderColor: "rgba(0,0,0,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(0,0,0,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(0,0,0,1)",
pointHoverBorderColor: "rgba(0,0,0,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [13, 78, 60, 75, 90, 10, 27],
spanGaps: false,
responsive: true,
animation: true,
}
]
},
options: {
tooltips: {
callbacks: {
title: function (tooltipItem, data) { return "" },
label: function (tooltipItem, data) {
var value = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
var datasetLabel = data.datasets[tooltipItem.datasetIndex].label || 'Other';
var label = data.labels[tooltipItem.index];
return value;
}
}
},showAllTooltips: true
}
});
To reproduce the problem, just click in one of the labels on the top of the graph.
Thanks in advance.
Just to close the question, I ended up changing to amcharts(https://www.amcharts.com/). It has features like the one i was trying to achieve with chart.js and is free to use under a linkware license.
Thanks again.
Related
I am using chart js ( https://www.chartjs.org/ ) for charts. I checked all option in document but did not find how to hide title color box. Please see attached image
Adding the following should hide the legend (I hope by title color box you mean legend):
legend:
{
display: false
}
var canvas = document.getElementById('myChart');
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: "My First dataset",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 5,
pointHitRadius: 10,
data: [65, 59, 80, 0, 56, 55, 40],
}]
};
function adddata() {
myLineChart.data.datasets[0].data[7] = 60;
myLineChart.data.labels[7] = "Newly Added";
myLineChart.update();
}
var option = {
showLines: true,
legend: {
display: false
}
};
var myLineChart = Chart.Line(canvas, {
data: data,
options: option
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.3/Chart.min.js"></script>
<canvas id="myChart" width="400" height="250"></canvas>
<input type="button" value="Add Data" onclick="adddata()">
Extending Peadar's answer with the options and plugins sections:
type: 'bar',
data: data,
options: {
plugins: {
legend: {
display: false,
} } }
That box is the legend. You can turn it off via the legend flag: https://www.chartjs.org/docs/latest/configuration/legend.html
var myChart = new Chart(ctx, {
type: 'bar',
legend: {
display: false
}
var chart = new Chart(ctx, {
type: 'bar',
data: data,
options: {
plugins: {
legend: {
display: false
}
}
}
For vue-chartjs, I added this in the options object
options: {
legend: {
display: false
}
}
I work with chart.js and i try to format x axis time series something would be difficult to format time series. i need to display tick interval with 2 hours.
now i got time series from my database looks like this.
but i want to display something like this
i try with scale x axis like this
scales:{
xAxes: [{
type: 'time',
time: {
format: "HH",
unit: 'hour',
unitStepSize: 2,
displayFormats: {
'hour': 'HH',
},
}]
}
if i try like this nothing changes if i add options before scales i did not get any data it shows empty graph. any idea please.
type: 'line',
data: {
xLabels: labels,
datasets: [
{
label: 'G.Oil', fill: true, lineTension: 0.1, backgroundColor: "rgba(75,192,192,0.4)", borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt', borderDash: [], borderDashOffset: 0.0, borderJoinStyle: 'miter', pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff", pointBorderWidth: 1, pointHoverRadius: 5, pointHoverBackgroundColor: "rgba(75,192,192,1)", pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2, pointRadius: 1, pointHitRadius: 10, data: datay, spanGaps: false,
}
],
},
options: {
scales: {
xAxes: [{
}]
}
}
function method() {
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [65, 59, 80, 81, 56, 55, 40],
spanGaps: false,
}
]
},
options: {
responsive: false,
}
});
I added a function to add a new value on the chart
function addvalue() {
myChart.data.labels.concat("August");
myChart.data.datasets[0].data.concat(55);
myChart.update();
but compiler say me "myChart is not declared" How can I draw the chart in this case?
I've just started with canvas and these charts
As Mihai has pointed out, read deeply into MDN's documentation about functions and about scope.
Your code needs to export or make the myChart variable accessible to other functions. Here is the quick and dirty fix - you need to decide what is best for your app.
const myChart = new Chart(ctx, {
type: 'line',
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [65, 59, 80, 81, 56, 55, 40],
spanGaps: false,
}
]
},
options: {
responsive: false,
}
});
This is global scope (not the best), but it will allow your other function to access it:
function addvalue() {
// myChart is now globally accessible
myChart.data.labels.concat("August");
myChart.data.datasets[0].data.concat(55);
myChart.update();
}
Without knowing more context I can't specifically say to do something better (like require your chart into other code)
Scope is important and also you want to return something
function method() {
return new Chart(ctx, {
type: 'line',
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [65, 59, 80, 81, 56, 55, 40],
spanGaps: false,
}
]
},
options: {
responsive: false,
}
});
var myChart = method();
function addvalue(myChart) {
myChart.data.labels.concat("August");
myChart.data.datasets[0].data.concat(55);
myChart.update();
return myChart;
}
I am trying to create a line chart with chart.js library, my goal is that the chart should be a single line, the area under it MUST NOT BE FILLED.
But whatever color I put, I dont see that its getting refreshed.
this is the JS that generates the chart.
<table style="width: 100%">
<tr>
<td style="width: 50%; text-align: center">
<canvas id="canvasForLineChart" height="200" width="400">Chart is Loading...</canvas>
</td>
</tr>
</table>
<script type="text/javascript">
////////////////////////////////////////////////////////////////////////////////////////////////////////
//Line Chart JSON Config (Line Chart Has fixed 1 data series here)
var lineChartData = {
//labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
fill: false,
lineTension: 0.1,
//backgroundColor: "#000000",
//borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
//pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
//pointHoverBackgroundColor: "rgba(75,192,192,1)",
//pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [0]
}
]
}
//LineChart Update method
function UpdateLineChart(data) {
//Set data returned from Server
//lineChartData.datasets[0].fillColor = data.colorString;
lineChartData.datasets[0].data = data.lineChartData;
lineChartData.labels = data.hora;
//Update the Pie Chart
var canvasForLineChart = document.getElementById("canvasForLineChart");
var context2DLine = canvasForLineChart.getContext("2d");
new Chart(context2DLine).Line(lineChartData);
}
</script>
But my result is this:
And I want something like this:
According to the Chart JS Docs, you'll want to specify:
fill: false
in your chart options. Your code would look something like this:
function UpdateLineChart(data) {
//Set data returned from Server
lineChartData.datasets[0].data = data.lineChartData;
lineChartData.labels = data.hora;
//Update the Pie Chart
var canvasForLineChart = document.getElementById("canvasForLineChart");
var context2DLine = canvasForLineChart.getContext("2d");
var myChart = new Chart(context2DLine, {
data: {
datasets: [{
fill: false,
lineTension: 0.1,
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [0]
}]
}
});
}
backgroundColor 'rgba(0,0,0,0.1)'
That should set your opacity to .1, you can go to zero I think but you should test it. I see you commented out the border color you had set to 1 opacity which is solid.
fill: false
should do the work, where do you call the UpdateLineChart function?
Well, i have the same issue that this guy: Chart.js not showing in my view , for him it solved to set a timeout but for me that's no even possible to introduce in my web, i don't want to work with timeouts.I'm working to create web-components for chart.js.There's any way to wait the chart to get render without setting a timeout?, that the waiting time is the render time
My code is:
flexygo.ui.wc.flxChart = function () {
return {
htmlItem: null,
moduleId: null,
refresh: function () {
this.init();
},
init: function () {
var ctx = this;
ctx.htmlItem.html('<canvas id="myChart2" height="400" width="800" style="width:800px;height:400px;"></canvas>');
ctx.render();
},
render: function () {
var ctx = this;
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: "My First dataset",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [65, 59, 80, 81, 56, 55, 40],
spanGaps: false,
}]
};
window.onload = function () {
var myChart = new Chart(ctx.htmlItem[0].childNodes[0], {
type: 'line',
data: data,
options: {
scales: {
xAxes: [{
display: false
}]
}
}
});
}
},
translate: function (str) {
return flexygo.localization.translate(str);
},
startLoading: function () {
this.htmlItem.parents('flx-module').find('.icon-sincronize').addClass('icon-spin txt-outstanding');
},
stopLoading: function () {
this.htmlItem.parents('flx-module').find('.icon-sincronize').removeClass('icon-spin txt-outstanding');
},
}
creating the chart we can use either htmlitem[0].childnodes[0] or document.getElementById('myChart2')
i solved it adding encapsulating the canvar into a div, so the canva resizes with my page, i changed:
from:
ctx.htmlItem.html('<canvas id="myChart2" height="400" width="800" style="width:800px;height:400px;"></canvas>');
to
ctx.htmlItem.html('<div><canvas id="myChart2" height="400" width="800" style="width:800px;height:400px;"></canvas></div>');
a now it works