JavaScript errors: why? and how to handle?

VCL TMS VCL WebGMaps
1

Why am I getting JavaScript error popus such as "'createmapmarker' is undefined"(also "alllabels", "map", "createmappolyline" and more)?

I am guessing that there was a communciation problwm with GoogleMaps (?).

I don't want my users seeing this and not knowing what is happening. Can I suppress it? Can I recover from it? How is it recommended to be handled?

2

Hi,


This usually means the WebGMaps control is executing JavaScript calls before the script has been fully loaded.

You can disable error messages like this: TwebGmaps1.WebBrowser.Silent
:= True;
 
Can you please explain exactly when the error messages occur?
If you can provide a ready to run sample project I can further investigate this issue.
3

Thank you so much for the very quick and helpful response!

Although
I thought that I was waiting until the OnDownloadFinish handler was
called before updating the map, I found one code path where I
accidentally tried to add a marker while the map was still Launching.