Can you tell which browser you are using? Are there any plugins like Adblockers installed?

@Juju-bln: Could you please answer the last comment? Thanks in advance!

Same here, see: T270868

Commenting out those 2 lines worked for me:
https://github.com/wikimedia/mediawiki-extensions-DrawioEditor/commit/f1fe8be4039daf6c64dda9022ac65e22deef11fb#diff-23ed847503c3826f70e8298892e203c8680e4a26dbdb78980a62a48687807819

But we should provide a better fix ;)

I have the same problem in Chrome, Edge and Firefox. No diagram text is rendered.

The fix by @Peesc works, however it also requires you to add 'http://www.w3.org/1999/xhtml' to $validNamespaces in includes/upload/UploadBase.php.

Although this topic is quite old - I'm struggeling with it. I want to setup Wikimedia 1.35.3-1040 with draw.io 17.4.3 (running as separate Docker instance) on my Synology DS220+.

I made both changes as described above, but still can't see any text (font) within the drawing. I have absolutely no clue where to start searching for any hint what's going wrong.

Is there any developer here who can give me a hint?

In T271347#7855196, @Dwloczka wrote:

Although this topic is quite old - I'm struggeling with it. I want to setup Wikimedia 1.35.3-1040 with draw.io 17.4.3 (running as separate Docker instance) on my Synology DS220+.

I made both changes as described above, but still can't see any text (font) within the drawing. I have absolutely no clue where to start searching for any hint what's going wrong.

Is there any developer here who can give me a hint?

Hmmm, I also changed the following line inside the src/DrawioEditor.php but not sure if it's related (Guess it's only a problem with interactive mode)

-                               $img_fmt = '<object id="drawio-img-%s" data="%s" data-editurl="%s" type="text/svg+xml"
+                               $img_fmt = '<object id="drawio-img-%s" data="%s" data-editurl="%s" type="image/svg+xml"

That's all I've changed for a running Draw.io Mediawiki 1.35.X instance :)

Mh... it's working now.... I didn't change anything and just checked layout from my smartphone - it worked correctly.

Another check with my Linux-Laptop: all 3 browsers (Chrome, Opera and Firefox) show the text inside the box and even linking from within the flowchart works. Strange, but great!

The change of image type from text/svg to image/svg I made before as well. Without firefox didn't show the chart at all.

thanks anyway.

I experienced the same issue with SVG documents not displaying the text. MediaWiki 1.37, DrawioEditor master 01 Aug 2022, Browser Edge 103.0.1264.77 on OS-X
Fix was all of the resolutions provided above -

• Change text/svg+xml to image/svg+xml in src/DrawioEditor.php
• Comment out the 'datastr = datastr.replace( expr, '"http://www.w3.org/2000/svg"' ); ' line in resources/ext.drawioeditor.js:
• Add 'http://www.w3.org/1999/xhtml' to $validNamespaces in includes/upload/UploadBase.php.