Display Error Message when map not available

[Perry]

We seem to be getting a few network errors where tile.openstreetmap.org (a,b,c, subdomains) are sometimes unavailable.   What would be the best way to detect this and then display a message to the user that "Map is not Available"?

[Georgi]

Hi Perry,

Generally speaking, the map is a container full of img elements. each img element represents a tile. In other words, the images are requested by the browser - not by us and therefore we do not have access to that request and check whether it succeeded.

Nevertheless, you could add a service worker to your page and use it as a proxy to check whether there is a failing request.

Also, I can suggest you to take a look at the following thread where testing whether images are loaded correctly is discussed:

• https://stackoverflow.com/questions/9815762/detect-when-an-image-fails-to-load-in-javascript

I hope this helps


Regards,
Georgi
Progress Telerik