JMRI Web Access

Basic Use

JMRI supports working with your layout from a web browser.


Details of the JMRI web components.

JMRI: Frame Servlet

The JMRI Frame Servlet provides web access to JMRI windows. Its base url is "/frame/", which by itself will return a page listing available frames.

It uses the facilities of the jmri.util.JmriJFrame class to locate windows and create an image of their current appearance. The window does not have to be maximized, but it does have to be open; it's OK for the window to have been minimized.

The Web Server Preferences can be used to adjust the default delay after a click and adjust the periodic refresh between clicks. You can also enter a list of frames which are not to be allowed, and enable ajax refresh (recommended) or use the older meta-refresh.

You can override the defaults for individual pages by adding the following yes/no parameters to your URL:

To display any already open JMRI window as a clickable image that periodically refreshes, use a URL like:

Note the frame title in the URL, followed by ".html". Replace any spaces in the title with "%20".

For current, dynamically-generated list of available windows, use this URL:

Note: Adjust defaults such as refresh timing, disallowed frames and ajax usage in Web Server Preferences.

You can override the defaults for individual pages by using the following parameters in your URL: Example, showing no links, protected, using ajax to refresh every 12 seconds:

The jmri/web/servlet/frameimage/ properties file can be used to configure the HTML that's returned when a frame is requested.