I made a responsive doughnut in chartjs. On mobile devices the size fills out the screen nicely and is as I'd like it but when I switch to desktop it also fills out the entire screen and is too big for my liking. Is there a way to set the relative size to for example, half screen when viewing on desktop and then reverting to full-screen if being viewed on mobile?
I tried the different settings on the chartjs site but can't find anything helpful.
I'm working with Chart.js version 2.8 so not sure if it is in the version or if it is a common issue.
My chart loads fine at first but then my page refreshes and the duplicates can be seen when I hover on any of my charts(there are 4).
The duplicate looks like this:
!https://postimg.cc/3db6xFTz
I'm not sure what to try or where to start looking at what causes this. I've tried searching for similar cases but no one seems to have this issue. Any advice would be greatly appreciated.
Right, well I found the problem and the solution.
The root of the issue came about when my page refreshed and the chart would resize. I then tried the Chart.defaults.global.maintainAspectRatio= false;command which worked but duplicated the X-axis tick labels.
The problem: These two commands cannot work together. It causes the duplication on hover.
Chart.defaults.global.responsive = true;
Chart.defaults.global.maintainAspectRatio= false;
The solution: found in the chartjs.org documentation.
Detecting when the canvas size changes can not be done directly from the canvas element. Chart.js uses its parent container to update the canvas render and display sizes. However, this method requires the container to be relatively positioned and dedicated to the chart canvas only. Responsiveness can then be achieved by setting relative values for the container size (example):
<div class="chart-container" style="position: relative; height:40vh; width:80vw">
<canvas id="chart"></canvas>
</div>
Note that in order for the above code to correctly resize the chart height, the maintainAspectRatio option must also be set to false.
I added the div's to encase my canvas, changed the sizing and this fixed my problem :)
I can not get ChartJS to restrict itself to 200px. It takes the entire width of the browser. What am I missing.
I am using the following CDN
<div id="pnlChart" style="height:200px" >
<canvas id="myChart" width="400" height="200" class="chart" ></canvas>
</div>
my data that is being returned from the server appears to be well formed and drawing the chart correctly. It does not have the width/height in it. (I have pulled this from Chrome's dev tools.
{"type":"line","labels":[0,2,6,7,8,9,10,11,12,13,14,1,3,4,5,15,16,17,18,19,20,21,22,23],"datasets":[{"label":"Data","data":[2,1,8,36,119,179,214,165,87,173,220,0,0,0,0,0,0,0,0,0,0,0,0,0]}]}
You should be able to disable this container-width filling behaviour by telling Chart.js not to use responsive mode. Try passing this into the global configuration of the chart (the highest level of options):
options: {
responsive: false
}
See the Chart.js documentation for an example of how this fits into the full definition of a chart.
If that does not work for some reason then you could instead limit the width of the div element which contains the canvas on which your graph is drawn. Based on your example you could add this to your CSS:
div#pnlChart {width: 200px}
Even if you can get one of these methods to work, ideally you don't want to be specifying fixed widths for items these days because it makes it harder for pages to display well on the myriad of device screens which are in use now.
It's much better to develop a responsive layout for your site which will adjust to suit any screen width, from small smartphones to large desktop monitors. Search online for guides about "responsive design" for articles about this subject.
I am creating two charts Line Chart and Donut Chart on same HTML Page using Google JS API. But these charts are not responsive. How can I make those charts as responsive?
The Google Charts API was probably not designed with responsiveness in mind, specifically. The default size of the chart is to fill the element it's being rendered into, so you can just use CSS and Media Queries like you would normally do to make a responsive design.
The only real problem is that once the chart is drawn, it doesn't change it's size in a desktop window resize-type scenario. In Angular Google Chart we listen for the window's resize event and redraw the chart.
I've seen some of the resize strategy paired with a bit of JavaScript to keep the chart the same aspect ratio no matter how wide it is.
Anything more specific will need a more detailed question. I am intentionally not including any code for this answer, because whatever I write will probably be wrong for your situation.
Here's a google chart I've made:
I want the legend paging gone. On page 2 there are only 2 items, and obviously these 2 items could easily fit without paging.
After spending some time researching and playing around, it seems my only options are:
Make the chart area higher - It's already too big
Make the text smaller - It's already too small
Hide the legend and make my own - This is my last resort
Does anyone know how I can modify the legend height to fit the other 2 items?
Paging is gone only when legend.position is 'top' and give legend.maxLines:
legend:{ position:'top',maxLines:4}
https://developers.google.com/chart/interactive/docs/gallery/piechart?csw=1#Configuration_Options
It looks like you have extra vertical space at the bottom of the chart that you could use to expand the chartArea into:
chartArea: {
height: '85%',
top: '13%'
}
If that is not a viable solution, your only choice is to build a custom legend, as the API does not support altering the dimensions of the legend directly.