initialization of webclient through topicmap-level permalinks with background image

[Malte]

intialization of webclient trough permalink on topicmap level where topicmap has background image, does sometimes work but sometimes does lead to the following error messages:

in chromium it's

"Uncaught Type Error: Cannot call method 'draw_background' of undefined at <topicmapid>:line 277

and in firefox it's

topicmap is undefined: line 276

and in both cases the interface is not loaded any further so that the result is: a visitor send directly to a topicmap with a backgruond image has a 50:50 chance to see a correctly loaded interface.

the same is the case if the user is send to a topic-level permalink where the topicmap has set a background image..

as of writing i realize that this is issue is not just dependent on topicmaps which have backgruond-images assigned, it also happens once in a while when just calling the ​http://localhost:8080/ default entry point for the webclient or a permalink for a map which does not have a topicmap-backgruond image assigned.

hope this helps.

tested with a 2 days old 4.0.6-SNAPSHOT in chromium and firefox

[jri]

Thanks for pointing out that!
Yes, I see this issue in case of a plugin is initiating a canvas refresh (e.g. displaying topics) at a time the Topicmaps plugin is instantiated but not yet initialized.
However, I can't produce this with the DM standard distribution. I'm just curious: Do you have any custom plugins installed?

I consider a quick fix.

[Jörg Richter]

Topicmaps fix: catch undefined topicmap (#149).

Happens if canvas draw() is performed before the Topicmaps plugin is initialized.

Close ticket 149.

• Changeset: d419d0e80db2a3d99a67e14934a9a1059dc8bab8
• URL: ​https://github.com/jri/deepamehta/commit/d419d0e80db2a3d99a67e14934a9a1059dc8bab8

[Malte]

Great Jri! Thank you so much for this quick solution!!