I have to hide / remove all data points except the second last point as shown in this image I have searched everywhere but couldn't find the proper solution to achieve this.
myChart.datasets[0].points[0].display = false;
legStretchtCtx.update();
Above snippet is for Chart.js Version 1.0 but I'm using Chart.js Version: 2.7.1 . I have used this snippet but its giving an error:
Cannot read property '0' of undefined
var legStretchtCtx = document.getElementById("leg-stretch-chart");
// var legStretch =
var myChart = new Chart(legStretchtCtx, {
type: 'line',
data: {
labels: ["Day 1", "Day 2", "Day 3", "Day 4", "Day 5", "Day 6","Day 7"],
datasets: [{
label: 'Leg Stretch',
data: [3, 4, 5, 4, 3, 3.5, 3.5],
backgroundColor:"#70d6db",
borderColor: ["#70d6db"],
borderWidth: 4,
pointBackgroundColor: "#fff",
pointRadius: 8,
pointHoverRadius: 8,
pointHoverBackgroundColor: "#0ba8b0",
pointHoverBorderColor: "#26c1c9",
pointBorderColor:"#26c1c9"
}]
},
options: {
legend: {
display: false,
labels: {
display: true
}
},
responsive:true,
scales: {
xAxes: [{
gridLines: {
display: false,
drawBorder:false,
},
ticks: {
display: false,
fontFamily: "Montserrat",
fontColor: "#2c405a",
fontSize: 12
}
}],
yAxes: [{
gridLines: {
display: false,
drawBorder:false,
},
ticks: {
display: false,
fontFamily: "Montserrat",
fontColor: "#2c405a",
fontSize: 12,
stepSize:1,
min: 0,
max: 10,
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.1/Chart.bundle.js"></script>
<div class="chart-container">
<div class="leg-stretch-chart-inner">
<canvas id="leg-stretch-chart" width="100%" height=""></canvas>
</div>
</div>
First, change pointRadius to array:
pointRadius: [8, 8, 8, 8, 8, 8, 8]
Then, you have to rewrite this array with specific values for each point (in our case, the second last pont) and update:
$("#btnRemovePoints").click(function()
{
//change the radius of every point except one
myChart.data.datasets[0].pointRadius = [0, 0, 0, 0, 0, 8, 0];
myChart.update();
});
More details in this fiddle: https://jsfiddle.net/s7m1961t/
$( document ).ready(function() {
//My Chart 1
myChart1.data.datasets[0].pointRadius = [0, 0, 0, 0, 0, 8, 0];
myChart1.update();
//My Chart 2
myChart2.data.datasets[0].pointRadius = [0, 0, 0, 0, 0, 8, 0];
myChart2.update();
});
Related
I am building a line chart in chartjs, similar to this
Here is what I have achieved:
How can I make the zero on y-axis on the same level as the labels on the x axis.
I have tried almost everything from the chartjs documentation, but nothing seems to work
Codepen link
Here is my config object:
var config = {
type: 'line',
options: {
responsive: true,
maintainAspectRatio: false,
legend: { display: false },
scales: {
xAxes: [{
gridLines: {
drawBorder: false,
color: "#EEEEEE",
beginAtZero: false,
zeroLineColor: 'transparent'
},
ticks: {
fontColor: "#9A9A9A",
fontStyle: '600',
fontSize: 15
}
}],
yAxes: [
{
gridLines: {
color: "#EEEEEE",
beginAtZero: false,
zeroLineColor: 'transparent',
drawBorder: false
},
ticks: {
max: 30,
min: 0,
stepSize: 5,
fontColor: "#9A9A9A",
fontStyle: '505',
fontSize: 14
}
},
]
}
},
data: {
labels: ["", 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13],
datasets: [{
data: [null, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13],
showLine: true,
lineTension: 0,
fill: false,
pointRadius: 4,
borderWidth: 2,
pointBackgroundColor: "#FFFFFF",
backgroundColor: "transparent",
borderColor: "#973490"
}]
}
};
The first chart is a timeseries chart. Is this what you’re trying to accomplish?
With the linear axis chart you could add [null, null, null] to your data array and have corresponding xaxis values. This would leave space on the end.
Alternatively using the offset property in options may help
Or add a margin to the chart
I need to plot a single value in line chart. Currently i am using charts.JS library for line graph purpose.
The data will be varied some times i'll get the single data inside the data set at that time i need to plot the single value in the line chart.
I had tried with the charts.js annotation plugin but it didn't meet my requirements. which is like it wis overlapping the plotted point in the graph area.
My code
createLineChart() {
this.lineChart = new Chart(this.lineCanvas.nativeElement, {
type: "line",
data: {
labels:[],
datasets: [
{
fill: false,
backgroundColor: "#0168FF",
borderColor: "#0168FF",
pointBackgroundColor: "white", // wite point fill
pointBorderWidth: 1, // point border width
lineTension: 0,
pointBorderColor: "blue",
pointRadius: 4,
},
],
},
options: {
scales: {
yAxes: [
{
ticks: {
padding: 20,
beginAtZero: true,
min: 0,
stepSize: 100,
},
gridLines: {
drawBorder: false,
},
},
],
xAxes: [
{
// offset: true,
ticks: {
display: false,
//beginAtZero: true,
min: 0,
},
gridLines: {
zeroLineColor: "transparent",
drawBorder: false,
display: false,
},
//offset:true,
},
],
legend: {
display: false,
},
tooltips: {
enabled: false,
},
},
drawTime: "afterDraw", // (default)
} as ChartOptions,
// plugins: [ChartAnnotation]
},
});
}
To plot the data dynamically:
generateRandomDataSet(size) {
let yaxisArr = [];
let xaxisArr = [];
let random_data:any = this.getRandomData(size)
let maxYTickVal = Math.max.apply(Math, random_data.map((val) => {return val.yaxis}));
let maxVal = Math.ceil((maxYTickVal+1) / 10) * 10
for(let data of random_data) {
yaxisArr.push(data.yaxis)
xaxisArr.push(data.xaxis)
}
this.lineChart.data.datasets[0].data = yaxisArr
this.lineChart.config.data.labels = []
this.lineChart.config.data.labels = xaxisArr
this.lineChart.config.options.scales.yAxes[0].ticks.max =maxVal
this.lineChart.config.options.scales.yAxes[0].ticks.stepSize = maxVal/2
this.lineChart.update()
}
What i required
What i am getting
Thankyou.
There exists different approaches to solve this problem.
According to the answer I gave to a similar question, you can define an animation.onComplete function to draw the line.
In a comment on before mentioned answer, Lakshmansundeep suggested an approach where he defines the same data value three times but makes sure, pointRadius for the leading and ending data point is zero.
datasets: [{
data: [120, 120, 120],
...
pointRadius: [0, 4, 0],
pointHoverRadius: [0, 4, 0],
}],
For the second approach, please have a look at the code below.
new Chart('line-chart', {
type: "line",
data: {
labels: [null, 'A', null],
datasets: [{
data: [120, 120, 120],
fill: false,
backgroundColor: "#0168FF",
borderColor: "#0168FF",
pointBackgroundColor: "white",
pointBorderWidth: 1,
lineTension: 0,
pointBorderColor: "blue",
pointRadius: [0, 4, 0],
pointHoverRadius: [0, 4, 0],
}],
},
options: {
legend: {
display: false
},
tooltips: {
enabled: false
},
scales: {
yAxes: [{
ticks: {
padding: 20,
min: 0,
stepSize: 100
},
gridLines: {
drawBorder: false
}
}],
xAxes: [{
ticks: {
display: false
},
gridLines: {
zeroLineColor: "transparent",
drawBorder: false,
display: false
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="line-chart" height="80"></canvas>
I am trying to plot multiple line charts on a graph and I have a toggle to disable / enabled some of the plots. I am destroying / updating whenever required but when I see a particular plot separately, I can see a different plot but when its a mixed graph, the line shows a different plot.
Example fiddle : https://jsfiddle.net/njmr15w9/ ( You can try to comment first two plots from the dataset array and you can see how the green plot changes and shows incorrect points, which should not be the case )
labels: [1, 2, 3, 4, 5,6,7,8],
datasets: [
{
label: "Set 1",
data: [10, 20, null, 40, 30,null,20,40],
borderColor: "#F00",
fill: false,
steppedLine: false,
tension: 0,
fillBetweenSet: 1,
fillBetweenColor: "rgba(255,0,0, 0.2)"
},
{
label: "Set 2",
data: [60, 40, 10, 50, 60,null,50,20],
borderColor: "#00F",
fill: false,
steppedLine: false,
tension: 0.5
},
{
label: "Set 2",
data: [40, 50, 30, 30, 20,null,60,40],
borderColor: "#0D0",
fill: false,
steppedLine: false,
tension: 0,
fillBetweenSet: 1,
fillBetweenColor: "rgba(5,5,255, 0.2)"
}
]
};
var chartOptions = {
responsive: true,
title: {
display: true,
text: 'Demo Fill between lines'
}
};
var chartDemo = new Chart($('#demo').get(0), {
type: 'line',
data: chartData,
options: chartOptions
});
I followed your instructions and commented out the first two datasets. The result looks fine to me.
const chartData = {
labels: [1, 2, 3, 4, 5, 6, 7, 8],
datasets: [
/*
{
label: "Set 1",
data: [10, 20, null, 40, 30, null, 20, 40],
borderColor: "#F00",
fill: false,
steppedLine: false,
tension: 0,
fillBetweenSet: 1,
fillBetweenColor: "rgba(255,0,0, 0.2)"
},
{
label: "Set 2",
data: [60, 40, 10, 50, 60, null, 50, 20],
borderColor: "#00F",
fill: false,
steppedLine: false,
tension: 0.5
},
*/
{
label: "Set 2",
data: [40, 50, 30, 30, 20, null, 60, 40],
borderColor: "#0D0",
fill: false,
steppedLine: false,
tension: 0,
fillBetweenSet: 1,
fillBetweenColor: "rgba(5,5,255, 0.2)"
}
]
};
var chartOptions = {
responsive: true,
title: {
display: true,
text: 'Demo Fill between lines'
}
};
var chartDemo = new Chart(document.getElementById('demo'), {
type: 'line',
data: chartData,
options: chartOptions
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="demo" height="90"></canvas>
UPDATE
The problem lies in the fillBetweenLinesPlugin that simply doesn't work correctly when only one line is drawn. This can easily be fixed by changing the condition in the for loop by adding datasets.length > 1 as follows.
for (var d = 0; datasets.length > 1 && d < datasets.length; d++) {
...
}
Problem: Hi all! i am using chart.js to draw the charts. chart is a dynamic sometimes shows 10 points and sometimes can be more than thousand i have applied a panel successfully so that my points can be shown at some distance to read them easily.
Right now i want to know if there is any option to set the distance between points in x-axis grid. right now it automatically adjust the points.
What i tried:
i tried to do the stepsize and scalewidth by searching other stackoverflow answers but did not succeed. Any kind of help would be much appreciated.
P.S: i m using chart.js2
This is my chartjs dataset
var data = {
labels: data.graph_date,
datasets: [
{
label: 'Assay Values',
fill: false,
lineTension: 0,
backgroundColor: "rgba(255, 0, 0,1)",
borderColor: "rgba(255, 0, 0,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderWidth: 1,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(255, 0, 0,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(255, 0, 0,1)",
pointHoverBorderColor: "rgba(255, 0, 0,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: data.assay_value,
spanGaps: false
},var options = {
responsive: false,
title: {
display: true,
position: "top",
text: label,
fontSize: 18,
fontColor: "#111"
},
legend: {
display: true,
position: "bottom",
labels: {
fontColor: "#333",
fontSize: 16
}
},
tooltips: {
enabled: true,
mode: 'single',
callbacks: {
label: function(tooltipItems, data) {
var multistringText = ['Assay Value: '+tooltipItems.yLabel];
multistringText.push('Assigned Value: '+assigned_value[tooltipItems.index]);
multistringText.push('Sample ID: '+sample_id[tooltipItems.index]);
return multistringText;
}
}
},
scales:{
yAxes:[{
ticks:{
min:graph_min
}
}],
xAxes: [{
gridLines: {
display:false
}
}]
}
};
if(new_chart[ctx.canvas.id] != null)
new_chart[ctx.canvas.id].destroy();
new_chart[ctx.canvas.id] =new Chart(ctx, {
type: 'line',
data: data,
options: options
});
In x-axis there is data like this
[19-Aug-2015,21-Aug-2015,21-Aug-2015,21-Aug-2015,21-Aug-2015,22-Aug-2015,27-Aug-2015,29-Aug-2015,1-Sep-2015,2-Sep-2015,3-Sep-2015,]
in y-axis data is like this
[0.1,0.05,0.89,0.89,0.79,0.58,0.68,0.25,0.98]
The way to control distance between points it to set the X and Y axis with a min, max, and step size so that they never change regardless of the number of points that are in the chart.
Here is an example that sets the scales so that they will never change. Regardless of how many points appear on the chart everything will stay the same.
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'line',
data: {
datasets: [{
label: 'Points',
data: [
{x: 0, y: 2},
{x: 1, y: 3},
{x: 2, y: 2},
{x: 1.02, y: 0.4},
{x: 0, y: -1}
],
backgroundColor: 'rgba(123, 83, 252, 0.8)',
borderColor: 'rgba(33, 232, 234, 1)',
borderWidth: 1,
fill: false,
showLine: false,
}],
},
options: {
title: {
display: true,
text: 'Chart.js - Fixed X and Y Axis',
},
scales: {
xAxes: [{
type: 'linear',
position: 'bottom',
ticks: {
min: -1,
max: 8,
stepSize: 1,
fixedStepSize: 1,
}
}],
yAxes: [{
ticks: {
min: -2,
max: 4,
stepSize: 1,
fixedStepSize: 1,
}
}]
}
}
});
Here is a codepen example that demonstrates what this looks like
I'm trying to display a line chart on a webpage using Chart.js that shows the number of downloads in the apple store and google play store for a specific client for the past 5 days. The data appears properly, but does not properly label the X axis with this:
var downloadsChartData = {
labels: ["4 Days", "3 Days", "2 Days", "Yesterday", "Today"],
datasets: [{
label: "Google Play",
fill: false,
lineTension: 0,
backgroundColor: "rgba(0, 230, 115, 1)",
borderColor: "rgba(0, 230, 115, 1)",
borderCapStyle: 'butt',
borderJoinStyle: 'miter',
borderWidth: 2,
pointBorderColor: "rgba(150, 75, 75, 1)",
pointBorderWidth: 3,
pointRadius: 6,
pointHoverRadius: 9,
pointStyle: 'triangle',
data: [{
x: 1,
y: 2
}, {
x: 2,
y: 0
}, {
x: 3,
y: 3
}, {
x: 4,
y: 1
}, {
x: 5,
y: 1
}]
}, {
label: "iOS",
fill: false,
lineTension: 0,
backgroundColor: "rgba(26, 117, 255, 1)",
borderColor: "rgba(26, 117, 225, 1)",
borderCapStyle: 'butt',
borderJoinStyle: 'miter',
borderWidth: 2,
pointBorderColor: "rgba(150, 75, 75, 1)",
pointBorderWidth: 3,
pointRadius: 6,
pointHoverRadius: 9,
data: [{
x: 1,
y: 4
}, {
x: 2,
y: 2
}, {
x: 3,
y: 0
}, {
x: 4,
y: 1
}, {
x: 5,
y: 4
}]
}]
};
var downloadsChartOptions = {
title: {
display: true,
text: 'Downloads on Google Play and App Store',
fontSize: 30
},
scales: {
xAxes: [{
scaleLabel: {
display: true,
abelString: 'Date',
fontSize: 20
},
type: 'linear',
position: 'bottom',
gridLines: {
display: false
}
}],
yAxes: [{
scaleLabel: {
display: true,
labelString: 'Downloads',
fontSize: 20
}
}]
}
};
var downloadsChart = document.getElementById('downloadsChart').getContext('2d');
new Chart(downloadsChart, {
type: 'line',
data: downloadsChartData,
options: downloadsChartOptions
});
I tried to switch the data field to an array of values so that Chart.js would recognize the labels I defined in downloadsChartData to:
...
pointStyle: 'triangle',
data: [2, 0, 3, 1, 1]
}]
...
pointHoverRadius: 9,
data: [4, 2, 0, 1, 4]
}]
However, when I make this change, the chart not only doesn't correctly label the X axes, but also stops displaying the data on the line chart entirely.
Can someone please spot what I'm doing incorrectly? The documentation isn't too helpful in this matter.
The documentation is not very clear on this point, but for graphing non-numerical data (such as your case where the X axis represents a Date) you cannot set the X axis to have a linear scale. In other words, if you set your axis with a linear scale, it will graph the numerical representation of the data (and therefore, not the label).
I removed type: 'linear' from your downloadsChartOptions and it solved the issue.:
var downloadsChartOptions = {
title: {
display: true,
text: 'Downloads on Google Play and App Store',
fontSize: 30
},
scales: {
xAxes: [{
scaleLabel: {
display: true,
labelString: 'Date',
fontSize: 20
},
//type: 'linear',
position: 'bottom',
gridLines: {
display: false
}
}],
yAxes: [{
scaleLabel: {
display: true,
labelString: 'Downloads',
fontSize: 20
}
}]
}
};