Guided Add layers from file in Workflow

Christoph Wenninger

29 janvier 2026 09:05

So it just doesn't click between operations and me…

I want to add the "Guided Add layers from file" functionality as described in the Standard Commands to visualize data from a shapefile (.zip). When I configure the commands directly in my webapp through a button in vs web designer, there is no problem and everything works as intended.

But when I run those commands through Run Operation/Command in vs workflow, the first command prompts the choose file dialoge, but with the next Run Operation/Command  with results.upload-data-from-files I just keep getting errors.

The shapefile (simple single line feature) doesn't seem to be the problem, as it works in the web designer button function. I tried several different shapefiles as well.

I also tried several combinations of Run Operation and Run Command.

The .result of the first Run Operation with system.read-files (operation1) is:

{
   "blobs": [
       {
           "path": "./xyz.zip",
           "relativePath": "./xyz.zip"
       }
   ]
}

The errormessage of the next Run Operation with results.upload-data-from-files (operation2) is:

Error in footer element's submit event in a Display Form activity: [WF: activity error] Cannot read properties of undefined (reading 'blobs')

I tried the hint from my last problem and added a Create File activity between operation1 and operation2, but with no success.

I tried building the arguments for operation2 as described here. No success.

Do I miss anything?

I'm thankful for any hints!

Greetings,
Chris

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• 

  Berend Veldkamp

  29 janvier 2026 14:57

  Could you share the workflow, or at least the input parameters of ‘operation2’?

  0
• 

  Christoph Wenninger

  2 février 2026 09:55

  Hello Berend,

  good news first: I've got it sorted out!

  So it seems, that for the results.upload-data-from-files operation it matters with which software you ziped the .zip. (got a hint from a coworker)

  The operation doesn't like 7zip comprimised files. With Windows ziped files it has no Problem. I couldn't really sort it out why that is the case. But since in my case, the .zip will come directly from an FME Server, I just had to get it going from there.

  As Parameter I just pass the .result of the foregoing operation.

  So from here on, every following operation works, till...

  The bad news:

  Now I'm stuck with the layers.set-title operation and every command from there on. But now the error message for every operation is ‘Unknown operation “layers.set-title”’ (operationname depending on the operation).

  Im passing the layers.edit-symbols operation.result which looks like the LayerSettingsArgs.
  Since it's a pretty big object, im posting just the structure here:

  {

  labelingInfo: [],

  layers: [Proxy(t)],

  maps: Proxy(t) {},

  popupTemplate: [{…}],

  symbols: [a],

  taskSettings: [{…}],

  title: ['Import1'],

  [[Prototype]]: Object

  }

  So to end with my opening statement: it just doesn't click between operations and me…

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• 

  Berend Veldkamp

  3 février 2026 07:43

  Maybe because layers.set-title is a command and not an operation? Are you using the Run Command activity?

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• 

  Christoph Wenninger

  3 février 2026 08:23

  Dear Berend,

  once again, you are not the hero I deserve, but the hero I needed!

  Thank you for your help, now everything works as intended.

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