#Frequently asked questions
- Does Highcharts refer to files outside our domain?
- Can I use Highcharts with a ... server?
- Can I use features from Highcharts Stock in Highcharts?
- Can I add a data table to the exported chart?
- How can I get the best performance out of Highcharts?
- Can I export multiple charts to the same image or PDF?
- My non-English characters don't display right in my charts
- Can I generate charts on the server without using a browser?
- How do I define irregular time data?
- How do I add data from a MySQL database?
- Your map of my country does not include a disputed area
#Does Highcharts refer to files outside our domain?
For basic usage, Highcharts doesn't refer to any files other than highcharts.js/highstock.js, though there are some cases that you should be aware of.
- The exporting module. Since not all browsers are able to convert the chart to an image format, this operation is by default done on our web service, https://export.highcharts.com. The generated SVG is sent from your browser to the export server, and an image is sent back. If you're concerned about your data content being passed over the internet, you should consider our alternative solutions. The simplest alternative is to use our module for client-side export. Check out the features and compatibility table if it meets your requirements. If you have access to a node server, you can also set up your own export server.
- Certain features, including client side exporting, may require third-party dependencies. Some of these are loaded on demand from our servers, but in these cases the loading location is configurable. Details on all external dependencies, including licensing and security details, can be found in the optional dependencies documentation article.
#Can I use Highcharts with a ... server?
For a live connection to the server, you may set up the web page to load new data over XHR or set up direct communicatations using WebSockets. With the new data arriving in the browser, the chart can be kept updated through various dynamic endpoints like
Before you start to set up a complex backend, you may want to check out highcharts.com/download to see if there is a wrapper for your specific system.
#Can I use features from Highcharts Stock in Highcharts?
Yes, most Highcharts Stock features can be applied to standard charts. From a licensing point of view, using features of the Stock package obviously requires a Highcharts Stock license.
Technically Highcharts Stock is implemented as a set of plugins for Highcharts. The entire code base for Highcharts is included in the Stock package, and you can invoke a chart using
Highcharts.Chart and enable certain features that are normally associated with a stock chart.
#Can I add a data table to the exported chart?
If you don't care about the export, a data table is simply added by the
export-data module and a simple option, exporting.showTable. However this table doesn't support exporting to SVG or other image formats, but with a little programming on top of the Highcharts data and drawing API you can draw a table. See our jsFiddle demo for source code and live example.
#How can I get the best performance out of Highcharts?
When working with series with a high number of data points, there are a few things to consider.
- First of all, consider using the Boost module.
- Otherwise, for line plots, it is recommended that you disable point markers, as these will add a performance overhead. See https://highcharts.com/demo/line-time-series.
- Disabling shadows increases performance, as three shadow elements are created for each shape that includes a shadow.
#Can I export multiple charts to the same image or PDF?
Currently this isn't implemented in the core, but there are a couple of paths you can go to achieve this.
- Use our hack for exporting multiple charts. Basically, this code gets the SVG of all charts, modifies it and applies it to one single SVG file that is sent to the server for image conversion. We also support using our client side exporting module, if sending data to our server is a concern. See this demo for an example of this approach.
- Create a HTML file on your server that contains all your desired charts, and do a pure server side conversion of this. See Can I generate charts on the server without using a browser?
#My non-English characters don't display right in my charts
If you're using German umlauts, Scandinavian vowels or non-European alphabets, you need to use UTF-8 encoding for your files. There are two ways of doing this.
Make sure your HTML page where your charts are defined, is UTF-8. The file itself and if applicable its database content must be encoded as UTF-8. Additionally, either the
content-typeHTTP header or the corresponding meta tag must reflect this:<meta http-equiv="content-type" content="text/html; charset=utf-8" />
If you don't have access to change your whole HTML file, you can define your charts in a separate JS file that has UTF-8 encoding.<script src="charts.js" charset="UTF-8"></script>
#Can I generate charts on the server without using a browser?
Yes. See our article, Render charts on the server.
#How do I define irregular time data?
To add data points with irregular intervals, instead of defining pointStart and pointInterval for the series, define an X value (date) for each point. See https://jsfiddle.net/highcharts/Jx5n2/.
If you want the line to be broken for missing dates, insert null values instead.
#How do I add data from a MySQL database?
See Preprocessing data from a database.
#Your map of my country does not include a disputed area
We do our best not to take sides in border conflicts, however we realize the need for maps including disputed areas. To solve this, we try to keep our default maps conforming to neutral de facto borders or conventions, while providing alternative maps that include disputed areas. For a complete list of all of our maps, visit our Map Collection.