I am attempting to get Chart.js bar charts to have "internal" left and right padding, such that the bars are centered with minimal width between them, but larger space to the left and right. By default it seems the left and right padding is simply half the space between bars. Looking at the docs, I assumed that I could use the categoryPercentage and barPercentage parameters together to accomplish my task, but it seems that is only for multiple bars within a single column, whereas I have multiple columns with one bar in each. See image for what I am trying to do. Thanks for any insight.
I'm working on a Bar Pie Chart but my values are not lining up. For example, Red data is clearly larger then blue, but blue value is higher.
The data is correct, chart.js doesnt show the area as more, it uses the angle of the circle , which normally would also divede the area normally. And as you can see the angles are correct so to fix your issue you will have to write a custom controller that draws your chart. https://www.chartjs.org/docs/latest/developers/charts.html
I’m using donut chartjs graph to simulate a circle progress bar, with 40 positions in the dataset with green and 60 positions with light gray (simulating a 40% progress bar).
But when I start the graph, all datasets animate, but I would like to keep the gray ones static and animate only the green ones, to simulate a progress bar. Is this possible?
PS: I didn’t use other progress bar lib because I need the stripped effect that I have with 100 positions in my dataset.
Suggestions are welcome.
This question is similar to yours, there are two approaches, or you set up a plugin and draw a circle under the chart or draw two charts one of them is the background with no animation them set both to position absolute.
I have a line chart with two datasets. Initially the Y Axis is 0-100. The first line is roughly a straight line around a value of say 70, the second line is all below say 30. If I zoom the chart vertically by forcing the Y Axis min to 65 and max 75 (ie I want to exam the first line expanded vertically) then when I hover over a data point, the tooltip is missing. Actually I figure it is off the chart (so to speak :-) ).
The tooltip seems to be automatically positioned vertically between the lowest and highest data points, even if one of those data points is way below the chart.
My question: is this a bug or is there a way I can tell chart.js to ignore data points that are off chart when determining tooltip vertical position?
I'd even be happy if the tooltip was always at a fixed vertical position, ie across the top of the chart or centred vertically on the chart.
Using chart.js V2.7.1
Tooltips have two positioning modes, as per the documentation:
Possible modes are:
'average'
'nearest'
'average' mode will place the tooltip at the average position of the items displayed in the tooltip. 'nearest' will place the tooltip at the position of the element closest to the event position.
You can see both modes in operation at the relevant samples page.
average is the default mode. From your description, switching to nearest should resolve your issue.
I want to hide couple labels, first 2 and last 2 in axis X.
I want to disable black line at the bottom of the graph.
I'm able to do it after the chart is loaded - using javascript and change it dynamically. When I add new data and use draw method, Graph is overwriting my dynamic stylesheets changes. I was trying to set it as an option in graph initializer but I couldn't find the solution for that.
I use areaChart.
It was 3 years ago. I don't need it anymore. I'm leaving this question for others.
It's a little hard understanding what you're trying to do, but I think I get it.
As I read it, you want to eliminate two variables from your DataTable when you plot your chart (to prevent them from being in the legend)? Assuming that's the case, you can either take them out of the data table, or use a ChartWrapper on your object, and set the view:{columns:[x,y,z]} option to the ChartWrapper. Assuming you can't change the DataTable, or a ChartWrapper isn't an option, and you just want to not have certain plotted objects appear in your chart but not in the legend, you want to set the series option. For example, assuming three columns in your DataTable, you can hide the third item as:
series: [{visibleInLegend:true}, {visibleInLegend:true}, {visibleInLegend:false}],
Second of all, if you want to hide the horizontal axis, you need to have continuous data, and set hAxis.baselineColor to 'clear'.
To hide some of the tick-mark labels, use ticks: ticklist to label the axis, and for some of the labels in ticklist use an {v:value,f:label} structure definition, with a zero-length string for the label.
Here's an example. Note the omitted labels for some of the ticks on each vertical axis. View source to see how I did it:
http://www.sealevel.info/co2_and_ch4c.html
Note the tick list definitions. This one is for the left vertical axis:
var vticklist1 = [{v:235,f:''},{v:250,f:''},275,300,325,350,375,400,{v:425,f:'ppmv'}];
The first & second ticks (at the bottom, for values 235 and 250) display no labels. The next six ticks, for values 275-400, display normally. The last (top) tick displays as "ppmv" instead of 425. The result looks like this: