Print map using layers from multiple map services

[ThomasPuthusserry]

Is it possible to print map layers from multiple map services using ArcGIS Java Script API? I have situation where more than 2 map services needs to be included in a single JavaScript application and layers from any of these services (as selected by the user) needs to be exported as a map using the Export Webmap service (using a defined map template published from my server). However, when using the Export WebMap print service, there is only option to pass one map service as a parameter. Is there any way around?

[JoelBennett]

Indeed, it is rather strange to see someone generating print output the hard way, and I too would recommend the PrintTask as well, since it will greatly simplify things.

However, to just answer the question as it was presented, yes, you can pass multiple map service definitions to the ExportWebMap service.  The operationalLayers parameter is an array, so by definition accepts any number of values:

{
 "mapOptions": {
  /* etc, etc */
 },
 "operationalLayers": [
  {
   "id": "layer1",
   "url": "http://whatever.com/arcigs/rest/services/service1/MapServer"
  }, {
   "id": "layer2",
   "url": "http://whatever.com/arcigs/rest/services/service2/MapServer"
  }, {
   "id": "layer3",
   "url": "http://someOtherSite.com/arcigs/rest/services/service74/MapServer"
  }
 ],
 "exportOptions": {
  /* etc, etc */
 },
 "layoutOptions": {
  /* etc, etc */
 }
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

The above code just shows the structure...there are many parameters I have not displayed just for simplicity.