beta2 maxRotation set to 0 causes labels to overlap - javascript

I'm using a Chart.js beta 2 line chart. I'd like my x axis labels not to rotate, because it messes up my layout. I'm setting the options to have the ticks.maxRotation property set to 0. When I do so the labels are not skipped properly, but overlap instead.
this.options = {
scales: {
xAxes: [{
ticks: {
maxRotation: 0
}
}]
}
};
I also tried providing a ticks.userCallback to only show certain labels and skip myself, however I found doing this not only removes the label from the xAxis display, but also from the tooltip. I always want the tooltips to display the label.
So, what is the best way to keep labels oriented at 0 rotation and not have them overlap ?

Related

Chartjs: How can I group datasets closer if I have maxBarThickness set?

I have a chart where I've set a maxBarThickness on my axis. When the chart is populated with a lot of data, the datasets are close together, but when there are just a few data points, the datasets look wide apart.
I have tried setting categoryPercentage to a smaller percentage but when the chart is populated with a lot of data (or on page resize), the chart looks wrong. Any help would be appreciated.
According to this github issue you cannot change the space between bars if you decide to set a barThickness (I assume it does not work when maxBarThickness is set either but I might be wrong, if so I'll delete this answer)
According to the previous link, you have two solutions:
If you want to keep your bar thickness (answer to the github issue):
If you don't want to stretch out the bar to fill the extra space, you have to reduce the width of the canvas.
Otherwise you could set a barPercentage and a categoryPercentage on your chart, without a barThickness or a maxBarThickness:
scales: {
xAxes: [{
categoryPercentage: 0.8,
barPercentage: 0.9
}]
},
Those are the default values.
Related questions :
Chart.js Bar Chart: How to remove space between the bars in v2.3?
CharJS 2.5.0 - How to remove space between bars
Reduce space between ticks in horizontal bar-chart chartJS

ChartJS -- How do I change scale color when I have to scales?

I created a nice little chart with two scales using two datasets. I have read the documentation for ChartJS pretty thoroughly, but I can't seem to find out how to add specific colors to the chart scales (numbers). The left scale should be orange and the right one blue. Is this even possible, and if so, how do I do it? I don't think it's necessary for me to supply any source code for the chart itself, but let me know if it is.
Take a look at "Tick Configuration" under "Scales". You need to set the fontColor option for each axis. Like this:
options: {
scales: {
yAxes: [{
ticks: {
fontColor: "#666"
}
}]
}
}

Chart.js pie tooltip getting cut

I'm using Chart.js pie chart with tooltips which being cut for some reason.
Screenshot attached, didn't found any attribute/option to take care of it..
Is there anyway to take care of it?
Thanks!
This improper cutoff was raised as issue#622 in the Github repository for ChartJS.
This was determined to be a bug (evidently this bug hasn't yet been fixed)
https://github.com/nnnick/Chart.js/issues/622
In response to that issue, Robert Turrall has a solution which he says is a good workaround. Here is his proposed fix:
I'm sure that this is due to the fact that the tooltips are generated
within the confines of the canvas, making it difficult to fix.
I had the same issue on my doughnut chart and solved it by
implementing custom tooltips as per the example on the samples folder
- worked in conjunction with my existing tooltip fontsize and template settings in the chart initialisation code:
var myDoughnutChart = new Chart(donut).Doughnut(donutdata, {
tooltipFontSize: 10,
tooltipTemplate: "<%if (label){%><%=label%>: <%}%><%= value %>hrs",
percentageInnerCutout : 70
});
Check out samples/pie-customTooltips.html for the custom tooltip code.
Copy/paste and it worked straight away. Very happy!
Tooltip displayed well outside the bounds of the canvas:
PS: there's a line chart example too, which I'm guessing will work
fine with bar charts.
You can add internal padding to the chart. For instance in my case I had a cut of tooltips on the right.
options: {
responsive: true,
maintainAspectRatio: false,
cutoutPercentage: 60,
legend: {
display: false
},
animation: {
animateRotate: false
},
layout: {
padding: {
right: 40
}
}
}
I found a workaround for this. I have blank labels on my x axis, so I just added a label with several spaces in it for the last label entry. That caused ChartJS to leave enough space for the label to fit, which also leaves enough room for the tooltip to fit.
In addition, I have large circles for my data points and the last one on the right was getting clipped before. Adding the extra space to the label also fixed that.
Here is the code where I create my labels. The ratings is my actual data defined earlier:
// Add blank labels and "Today"
for (i=0; i<ratings.length; i++) {
labels.push("");
}
labels[ratings.length-1] = " ";
var data = {
labels: labels,
datasets: [
{
label: "Progress",
strokeColor: "rgba(255,165,0,1.0)",
pointColor: "white",
pointStrokeColor: "rgba(255,165,0,1.0)",
pointHighlightStroke: "#B87700",
data: ratings
}
]
};
Even if you have actual labels on your graph, you could add spaces to your last label to make it bigger. If you are centering your label, you could add the same amount of space before and after.
Obviously there will be limits where this will or won't work for you, but for my case I added 7 spaces and all looks good now.
Also, my case had an issue on the right side, whereas this question has an issue with the left side. The same fix should work, but putting the space on the first label.
It seems like Chart.js can't figure out which direction to show the tooltip because it can't detect the size of the tooltip element when it extends beyond the canvas.
In my scenario I fixed it by squeezing the text inside this particular tooltip closer with these options for the tooltip options object:
tooltips.titleMarginBottom = 1;
tooltips.bodySpacing = 1;
tooltips.yPadding = 2;
Wierdly enough Chart.js then correctly decides to show the tooltip to the left of the mouse and not below.
Would be cool if you could choose which direction the tooltip appears compared to the mouse.
In my case, I was able to work around this issue by reducing the amount of text in the tooltip. I did so using custom tooltip callbacks to specify the label text. My initialization looked like this:
var chart = new Chart(canvas.getContext("2d"), {
type: 'line',
data: chartData,
options: {
responsive: true,
tooltips: {
callbacks: {
title: function(tooltipItems, data) {
return tooltipItems[0].xLabel;
},
label: function(tooltipItems, data) {
return tooltipItems.yLabel;
},
}
},
},
});
There appears to be a fix available that hasn't yet been merged into the project: https://github.com/chartjs/Chart.js/pull/1064
Interestingly, by the setting the tooltipCaretSize option to 0 solves the issue.
{ tooltipCaretSize: 0, ... }

Dygraphs: One series with two y-axes

What I would like to do is plot a single series with two y-axes "locked" to the same data -- for instance, °F and °C temperatures (or feet and meters, etc.) that could be read off either axis, but only one set of points would be plotted.
Things I have tried:
1) Create two series, the second with the converted values, and plot on "on top" of the other (in this case, there's a constant conversion value of 1.51):
date,unit1,converted_unit2
2012-03-19,1.598333,3.108333
2012-03-20,1.542083,3.052083
2012-03-21,1.483333,2.993333
Generally works; however, Dygraphs dynamically scales both y-axes independently to be "pretty", and so the two series don't always plot directly on top of each other.
2) Set visibility of the second series to FALSE:
series: { 'converted_unit2': { axis: 'y2' } },
visibility: [true, false]
Doesn't work: Dygraphs defaults to scaling secondary y-axis for invisible series to 0-to-1.
3) OK, keep them both visible, but set the second series to transparent:
series: { 'converted_unit2': { axis: 'y2' } },
colors: ['#000080','rgba(0,0,0,0)']
This almost works -- however it has the side effect that the label for the second series in the dynamic legend is now transparent. And, since the axes are still being independently calculated to be "pretty", they are not exactly aligned -- the secondary y-axis is potentially a few percentage off the first y-axis.
(I also tried setting the second series visibility to FALSE and manually setting the second y-asix using the values obtained from yAxisRange(), which works well, but the second y-axis doesn't respond correctly to zooming the graph.)
Is there a way to easily create two y-axes for a single series which are "locked" together?
Thanks,
-bryan
same problem here ;)
we used to add a second (dependent) axis by using a single data point in a second series (which allowed a second axis) and fixed axis ranges for both axes (the second range calculated from the first range). Second color was set to transparent, second label was hidden ... worked fine until we had to switch to dynamically scaled axis ...
the second series in the dynamic legend is now transparent
hm, you can change this with css (as it's an inline style, you'll have to use !important to override it) or js (remove the inline style or change it).
Yes, an option for a second (dependent) axis would be great!
Jean
Set the stroke width of the second series to 0:
series: {
converted_unit2: {
axis: 'y2',
strokeWidth: 0
},
}

Individual positioning of x-axis labels in a polar highchart

I have a polar highchart with 12 categories. Since x-axis labels contain up to 4 lines, automatic label y-positioning is slightly off for the categories on the top and the bottom. It looks similar to this example, but in my case, the labels overlap with the chart area, not with each other. So I need to subtract a few pixels from the y-coordinate of the labels on the top and add a few pixels for the category labels at the bottom.
I tried setting the offset parameter of the x-axis, but this shifts up or down all labels by the same amount:
xAxis: {
offset: 20
}
I also tried adding a callback function to the formatter of the x-axis labels, but I just can't figure out how to adjust every category label position.
this is a solution of highchart Heldesk
http://jsfiddle.net/crguqmsv/1/
function(chart){
var len = chart.xAxis[0].ticks.length;
$.each(chart.xAxis[0].ticks,function(i,tick){
if(i>=0 && i<=90) {
console.log(tick.label.attr({
rotation:-45
}));
}
});
}
You can adjust the position of the labels with the "x" and "y" options within the "labels" category under the axis definition.
labels: {
x: 20,
y: 10
}
In the above case, the labels will be 20px right and 10px down from their default position.
EDIT: I re-read the title, and Im sorry, this is for all the labels, not individually. My Bad.

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