topic Re: Print widget - Problem with custom request parameters in ArcGIS JavaScript Maps SDK Questions

Print widget - Problem with custom request parameters

JerePallaskorpi — Thu, 04 Mar 2021 08:25:00 GMT

Hello,

We recently updated our ArcGIS JS API version from 4.13 to 4.18 and there seems to be a problem with sending custom request parameters for Print widgets' printServiceUrl.

Basically we have our own proxy/api ("/api/GPServer/Export Web Map") for printing, and we require some extra request parameters so we can highlight the selected features on the map for the print.

https://developers.arcgis.com/javascript/latest/api-reference/esri-widgets-Print.html

const print = new Print({ view, printServiceUrl: "/api/GPServer/Export Web Map?customPrintParameters={example: parameters}" });

We pass extra request parameters to Print widgets' printServiceUrl, but the request parameter (customPrintParameters) is always null in our backend api when the print widget is used within the app.

This was working fine with v4.13. Is this behaviour intended and is there some other way the custom request parameters could be sent to our backend with the Print widget?

Re: Print widget - Problem with custom request parameters

ReneRubalcava — Fri, 05 Mar 2021 16:24:08 GMT

Can you add them to the PrintParameters.extraParameters property?

https://developers.arcgis.com/javascript/latest/api-reference/esri-tasks-support-PrintParameters.html#extraParameters

That should be how custom parameters are sent. I'm surprised it worked before in the print service url, technically I don't think it should have.

Re: Print widget - Problem with custom request parameters

JerePallaskorpi — Fri, 05 Mar 2021 09:43:57 GMT

Hmm, doesn't this mean we would need to switch from the Print widget to PrintTask, or is there some way the PrintParameters can be applied to the Print widget? It seems like lots of extra work to switch to PrintTask and according to some samples I found we would lose the widget window that includes all the file formats/layout options etc.

It has been extremely simple just to add the extra parameters to the Print widgets' printServiceUrl.

Re: Print widget - Problem with custom request parameters

Noah-Sager — Tue, 09 Mar 2021 17:20:57 GMT

We are considering this for a future enhancement of the Print widget. In the meantime:

Would templateOptions suffice for this use case? https://developers.arcgis.com/javascript/latest/api-reference/esri-widgets-Print.html#templateOptions

If not, it looks like the print() method on the ViewModel can pass a PrintTemplate: https://developers.arcgis.com/javascript/latest/api-reference/esri-widgets-Print-PrintViewModel.html#print