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.net Powerful JavaScript charts
About
RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 17 years old) and has a wealth of features making it an ideal choice to use for showing charts on your website.

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New datagrid in v6.21
In version 6.21 a new datagrid object has been added. This makes it easy to add static or dynamic data tables to your pages. It can be used whether you use the canvas or SVG libraries or entirely standalone.

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Download
Get the latest version of RGraph (version 6.21, 10th April 2025) from the download page. You can read the changelog here. There's also older versions available, minified files and links to cdnjs.com hosted libraries.

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License
RGraph can be used for free under the GPL or if that doesn't suit your situation there's an inexpensive (£129) commercial license available.

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How do I add crosshairs to a Line chart?


Posted by Lorri at 18:24 on Thursday 31st December 2020 [link]
I have a Line chart that I'd like to add crosshairs when the user clicks or hovers over a point.

Thanks.

Posted by Richard at 18:37 on Thursday 31st December 2020 [link]
The easiest way is to just use the crosshairs* properties. With the Line chart it only works with the mousemove event.

I've made you an example and it's here:

https://codepen.io/rgraph/pen/LYRdbwJ

NOTE:

Initially I said that you had to use the Scatter chart for this - but that is only if you wish to get an X/Y coordinate pair (since the Scatter chart has an X axis scale). This example shows a Line chart with crosshairs.

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