ReferenceError: "L is not defined"

[Rudloff]

Setup

• Maps version: 5.6
• MW version: 1.31.1
• PHP version: 7.0.30-0+deb9u1
• SMW version (if applicable): 3.0.0-rc.2

Issue

I found this while creating the example for #479.

On this example page, the maps don't load correctly.
And I get this error in the console:

ReferenceError: "L is not defined"
<anonymous> https://sandbox.semantic-mediawiki.org/w/load.php?debug=false&lang=en&modules=ext.maps.common%2Cleaflet&skin=vector&version=1jnszwn:9:1
runScript https://sandbox.semantic-mediawiki.org/w/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=0x384ib:162:129
checkCssHandles https://sandbox.semantic-mediawiki.org/w/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=0x384ib:162:785
execute https://sandbox.semantic-mediawiki.org/w/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=0x384ib:163:496
implement https://sandbox.semantic-mediawiki.org/w/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=0x384ib:169:897
<anonymous> https://sandbox.semantic-mediawiki.org/w/load.php?debug=false&lang=en&modules=ext.maps.common%2Cleaflet&skin=vector&version=1jnszwn:1:333 load.php:177:183

I don't know what causes this (but it looks similar to #321).

Edit: It seems to work again if I remove the display_map part and purge the page.

[JeroenDeDauw]

Some changes to how the JS is loaded where made in Maps 6.0, so this might be fixed in the latest version already.

[JeroenDeDauw]

Can anyone confirm this is still present in Maps 6.x?

[kghbln]

Currently it is pretty hard to test since upgrading to Maps 6.x is not possible. :( However this issue is a real pain in the you know what. It also happens on MW 1.27.5, Maps 4.4.0 and without SMW being installed, but I did not see this until Page Forms was installed.