While plotting a chart in chart js with y axes steps like 0 573 675 900. When i plot it the spacing is between adjacent points are. can i bring the points evenly spaced?
Consider the image
chart
In this image i want the number 7 to appear exactly in the middle and the chart to scale between 1 and 7 and also 7 and 10 accordingly.
Following is a sample code iam working on:
////////////////////////////////////////////////////////
document.addEventListener("DOMContentLoaded", function() {
var
example = document.getElementById('example1'),
hot;
var headers = ["Red", "Blue", "Yellow", "Green", "Purple", "Orange", "Pink", 'Brown'];
var myData = [
[5, 10, 3, 5, 2, 3, 5, 1],
[9, 9, 3, 10, 8, 7, 7, 2],
[5, 1, 10, 6, 7, 9, 4, 8]
];
var StepValues = [1,7,10];
var rowheaders = ['Mark', 'Anna', 'Diana']
hot = new Handsontable(example, {
data: myData,
rowHeaders: rowheaders,
colHeaders: headers,
readOnly: true,
colWidths: 88,
licenseKey: 'non-commercial-and-evaluation',
fillHandle: {
autoInsertRow: false,
}
});
var options = {
type: 'bar',
data: {
labels: headers,
datasets: [{
label: rowheaders[0],
data: myData[0],
borderWidth: 1,
backgroundColor: 'rgb(255, 236, 217)'
}, {
label: rowheaders[1],
data: myData[1],
borderWidth: 1,
backgroundColor: 'rgb(235, 224, 255)'
}, {
label: rowheaders[2],
data: myData[2],
borderWidth: 1,
backgroundColor: 'rgb(219, 242, 242)'
}]
},
options: {
scales: {
yAxes: [{
ticks: {
reverse: false,
callback: (label) =>{
if(StepValues.includes(label)){
return label;
}
}
}
}]
}
}
}
var ctx = document.querySelector('.chartJSContainer').getContext('2d');
var myChart = new Chart(ctx, options);
});
//////////////////////////////////////////////////////////////////
Related
I struggle to let my second y-Axis scale to my second data array.
The green data should be scaled according to the right y-Axis (not working).
The red data is correctly scaled to the left y-Axis.
<div id="chartWrapper" class="card-content column is-two-thirds">
<canvas id="myChart" height="250px"></canvas>
<script>
const ctx = document.getElementById('myChart').getContext('2d');
const myChart = new Chart(ctx, {
type: 'line',
data: {
labels: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23],
datasets: [{
label: 'Temperatur in C°',
yAxisID: 'A',
borderColor: "red",
data: 0
},
{
label: 'Niederschlagsmenge in mm',
yAxisID: 'B',
borderColor: "blue",
data: 0
}]
},
options: {
scales: {
A: {
type: 'linear',
beginAtZero: false,
position: 'left',
display: true
},
B: {
type: 'linear',
beginAtZero: false,
position: 'right',
display: true
}
}
}
});
</script>
</div>
Don't be confused with the data being 0, I add the data dynamically.
Thank you very much for any help.
This is because you are using V2 of chart.js in which the scales need to be configured as arrays like so:
new Chart(ctx, {
type: 'line',
data: {},
options: {
scales: {
yAxes: [{
id: 'A'
}, {
id: 'B'
}]
}
}
})
i use of chart.js package for create a chart.
my problem:
how change the color of label of each legends?
for example:
color of "legend1" be: red.
color of "legend2" be: blue.
my codes:
const ctx = document.getElementById('myChart').getContext('2d');
const myChart = new Chart(ctx, {
data: {
labels: ['۱۴۰۰/۰۱/۰۱', '۱۴۰۰/۰۱/۰۲', '۱۴۰۰/۰۱/۰۳', '۱۴۰۰/۰۱/۰۴', '۱۴۰۰/۰۱/۰۵', '۱۴۰۰/۰۱/۰۶'],
datasets: [{
type: 'line',
label: 'legend1',
backgroundColor: 'rgb(14, 156, 255)',
data: [6, 5.5, 4, 7, 5.4, 5.8],
fill: false,
borderColor: 'rgb(14, 156, 255)',
tension: 0
},
{
type: 'line',
label: 'legend2',
backgroundColor: 'rgb(22, 185, 156)',
data: [6.2, 5.7, 3.8, 7.2, 5.2, 5.9],
fill: false,
borderColor: 'rgb(22, 185, 156)',
tension: 0
}
] //end : datasets
}, // end: data
options: {
plugins: {
legend: {
labels: {
font: {
size: 18
} // end: font
} // end: labels
,
position: 'bottom',
rtl: true,
align: "start"
} // end: legend
}, // end: plugins
scales: {
y: {
beginAtZero: true,
display: false
} // end: y
,
x: {
grid: {
borderDash: [6, 5],
lineWidth: 1,
color: '#CCCCCC'
} // end: grid
} //end:x
} // end: scales
} //end: options
});
<script src="https://cdn.jsdelivr.net/npm/chart.js#3.7.1/dist/chart.min.js"></script>
<canvas id="myChart" width="778" height="433"></canvas>
my problem is just that: how change the color of each legend's text?
color of "legend1" text and color of "legend2" text.
my codes result:
To achieve what you want you will need to use a custom generateLabels function like so:
const legendColors = ['red', 'blue']
const options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'pink'
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderColor: 'orange'
}
]
},
options: {
plugins: {
legend: {
labels: {
generateLabels: (chart) => {
const datasets = chart.data.datasets;
const {
labels: {
usePointStyle,
pointStyle,
textAlign,
color
}
} = chart.legend.options;
return chart._getSortedDatasetMetas().map((meta, i) => {
const style = meta.controller.getStyle(usePointStyle ? 0 : undefined);
const borderWidth = Chart.helpers.toPadding(style.borderWidth);
return {
text: datasets[meta.index].label,
fillStyle: style.backgroundColor,
fontColor: legendColors[i],
hidden: !meta.visible,
lineCap: style.borderCapStyle,
lineDash: style.borderDash,
lineDashOffset: style.borderDashOffset,
lineJoin: style.borderJoinStyle,
lineWidth: (borderWidth.width + borderWidth.height) / 4,
strokeStyle: style.borderColor,
pointStyle: pointStyle || style.pointStyle,
rotation: style.rotation,
textAlign: textAlign || style.textAlign,
borderRadius: 0, // TODO: v4, default to style.borderRadius
// Below is extra data used for toggling the datasets
datasetIndex: meta.index
};
}, this);
}
}
}
}
}
}
const 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/3.7.1/chart.js"></script>
</body>
Did you try the hex format ?
For example, you could try replacing "rgb(14, 156, 255)" by "#0e9cff"
More info here : https://devsheet.com/code-snippet/change-color-of-the-line-in-chartjs-line-chart/
How do you create custom tooltips that doesn't repeat if the points are on the same (x,y)? Take a look at "C" here. I'd like to only show the tooltip label once. It's the same information in any tooltip that is going to be shown if the points are on the same X-value.
var labels = ["A", "B", "C", "D"];
var d1 = [1, 2, 3, 10];
var d2 = [3, 4, 3, 7];
var dd1 = 'y';
var dd2 = 'y';
var ctx = $("#lchart");
var lchart = new Chart(ctx, {
type: "line",
data: {
labels: labels,
datasets: [{
cubicInterpolationMode: "monotone",
label: "s1",
data: d1,
pointHoverRadius: 6,
pointRadius: 6,
pointBorderWidth: 3
},
{
cubicInterpolationMode: "monotone",
label: "s2",
data: d2,
pointHoverRadius: 6,
pointRadius: 6,
pointBorderWidth: 3,
}
]
},
options: {
legend: {
display: false
},
tooltips: {
yPadding: 15,
xPadding: 15,
backgroundColor: "yellow",
titleFontSize: 14,
titleFontColor: "#999",
bodyFontColor: '#000',
bodyFontSize: 12,
displayColors: false,
callbacks: {
label: function(tooltipItem, data) {
var labelrows = [
"Title:",
dd1,
"",
dd2
];
return labelrows;
}
}
}
}
});
<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/2.9.3/Chart.min.js"></script>
<body>
<canvas id="lchart"></canvas>
</body>
Dont hardcode your response for the label and it runs for every label, you will need to use the title callback and just use the data passed in the arg for the value of the item:
var labels = ["A", "B", "C", "D"];
var d1 = [1, 2, 3, 10];
var d2 = [3, 4, 3, 7];
var dd1 = 'y';
var dd2 = 'y';
var ctx = $("#lchart");
var lchart = new Chart(ctx, {
type: "line",
data: {
labels: labels,
datasets: [{
cubicInterpolationMode: "monotone",
label: "s1",
data: d1,
pointHoverRadius: 6,
pointRadius: 6,
pointBorderWidth: 3
},
{
cubicInterpolationMode: "monotone",
label: "s2",
data: d2,
pointHoverRadius: 6,
pointRadius: 6,
pointBorderWidth: 3,
}
]
},
options: {
legend: {
display: false
},
tooltips: {
yPadding: 15,
xPadding: 15,
mode: "index",
backgroundColor: "yellow",
titleFontSize: 14,
titleFontColor: "#999",
bodyFontColor: '#000',
bodyFontSize: 12,
displayColors: false,
callbacks: {
beforeBody: () => ('Title:'),
label: function(ttItem, data) {
return ttItem.yLabel;
}
}
}
}
});
<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/2.9.3/Chart.min.js"></script>
<body>
<canvas id="lchart"></canvas>
</body>
I'm wondering if it is possible to have a graph with multiple lines, but I want one of the lines to start from the middle of the graph, while the rest of the lines still start from all the way at the left. Is this possible? It'd look like this:
The green line is what I am talking about, whether it would be possible for a dataset to start from not all the way at the left
Yes this is possible, you can achieve this in 2 ways, 1 is to specify each datapoint using its x and y coordinate another one is to place some null values in the start of your data array:
var options = {
type: 'line',
data: {
labels: [1, 2, 3, 4, 5, 6],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'pink'
},
{
label: '# of Points',
data: [{
x: 3,
y: 6
}, {
x: 4,
y: 8
}, {
x: 5,
y: 2
}, {
x: 6,
y: 12
}],
borderColor: 'orange'
},
{
label: '# of Points2',
data: [null, null, null, 9, 13, 15],
borderColor: 'lightblue'
}
]
},
options: {
scales: {
yAxes: [{
ticks: {
reverse: false
}
}]
}
}
}
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/3.5.0/chart.js"></script>
</body>
You can quickly do this with offset option.
Example:
const options = {
...otherChartOptions,
scales: {
x: {
offset: true
},
y: {
offset: true
}
}
};
Reference: https://www.chartjs.org/docs/latest/axes/cartesian/linear.html
I'm trying to make a Chart.js with a dynamic x-axis that will always use the next 7 months as the ticks for the x-axis.
But I'm having two problems:
The lines are not showing on my graph
The x-axis is only showing the first and last month, none of the months in-between.
Here is an example I made in paint to show what I'm trying to achieve:
And here is the code I have so far:
/* Build the charts */
var ctx = document.getElementById('ROIchart').getContext('2d');
var chart = new Chart(ctx, {
// The type of chart we want to create
type: 'line',
// The data for our dataset
data: {
datasets: [{
label: 'Paid Search and Leads',
backgroundColor: 'red',
borderColor: 'red',
data: [10, 10, 10, 10, 10, 10, 10],
}, {
label: 'SEO and Content',
backgroundColor: 'green',
borderColor: 'green',
data: [0, 2, 8, 21, 57, 77, 100],
fill: true,
}]
},
// Configuration options go here
options: {
responsive: true,
scales: {
xAxes: [{
type: 'time',
time: {
unit: 'month'
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.bundle.min.js"></script>
<canvas id="ROIchart"></canvas>
With the moment.js library, you can look at the length of your array, and from a starting month generate the months, and then put them as labels
/* Build the charts */
var ctx = document.getElementById('ROIchart').getContext('2d');
var array1 = [10, 10, 10, 10, 10, 10, 10];
var months = []
for (let i = 0; i < array1.length; i++) {
months.push(moment().year(2020).month(i+1).date(0).startOf('month'))
}
var chart = new Chart(ctx, {
type: 'line',
data: {
labels: months,
datasets: [{
label: 'Paid Search and Leads',
backgroundColor: 'red',
borderColor: 'red',
data: array1,
}, {
label: 'SEO and Content',
backgroundColor: 'green',
borderColor: 'green',
data: [0, 2, 8, 21, 57, 77, 100],
fill: true,
}]
},
options: {
responsive: true,
scales: {
xAxes: [{
type: 'time',
time: {
unit: 'month'
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.bundle.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.js"></script>
<canvas id="ROIchart"></canvas>