Basemap layer disappear on print. Only happens with max zoom

Question

I am fairly new to arcgis, please bear with me here.

ISSUE:

• I uses standard esri.dijit.Print for map printing.
• The base map displays normally in my map pane at all zoom levels.
• The printing function works as expected for all except one zoom level.
• When the map is zoom-in to the maximum level, the print result can show graphics from every layer except the base map. If only the base map and a single feature layer is selected, the result will show an mostly empty map with those feature graphics on it.
• No javascript error and task response success.
• tried comparing a successful print request of other zoom level with the failed request, no meaningful difference except the map extent.

lib version: 3.10.

connected via Lan

Request: http://xx.xx.xx.xx/arcgis/rest/services/Utilities/PrintingTools/GPServer/Export%20Web%20Map%20Task/execute

Part of Web_Map_as_JSON: (note that the "land" layer is actually the base map I was referring to in the question)

"mapOptions":{"showAttribution":true,"extent":{"xmin":829211.7728597418,"ymin":840643.6650277233,"xmax":829322.236622336,"ymax":840675.9442589484,"spatialReference":{"wkid":102140,"latestWkid":2326}},"spatialReference":{"wkid":102140,"latestWkid":2326}},"operationalLayers":[{"id":"land","title":"land","opacity":1,"minScale":640000,"maxScale":1000,"url":"http://xxxx/MapServer"},{"id":"basemap","title":"basemap","opacity":1,"minScale":0,"maxScale":0,"url":"http://xxxx/MapServer"}

User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36

Does anyone have any idea where to even start with the debugging?

Answer 1

This could be happening for a couple of reasons.

1. The "land" layer in your example json (or another layer not in your example) could be drawing on top of the basemap. The print task will order the layers according to your json. so if the land layer is first in operationalLayers it will draw on top of every other layer (it's like being at the top of the TOC in arcmap). Depending on what's in the layers above the basemap they could be masking it. I've seen layers that work fine in arcmap or as a map service on a web map but when sent to the print service, they mask everything beneath them.

   You can test this out pretty quickly by going to your print endpoint: http://xx.xx.xx.xx/arcgis/rest/services/Utilities/PrintingTools/GPServer/Export%20Web%20Map%20Task/execute and entering the webmap json with every layer but the basemap layer removed. If you get a blank map then this probably isn't the issue.

2. Stefan may be on the right track about your internet connection. It's probably not your internet connection but it might be the print server's. More specifically it might be a security or proxy issue. Without knowing more about your setup I can't be sure but the best way to troubleshoot this is to see if you can run the print task from the server via arcmap.

   • In Arcmap 10 navigate to Toolboxes -> System Toolboxes -> Server Tools -> Printing -> Export Web Map

   • In the Export Web Map dialog enter your webmap json and other parameters and click ok.

3. unless your browser window is set to exactly the proportions of the data frame in the print template then the print service has to make adjustments to either the scale of the map or the extent. The preserveScale option on the print template (template.preserveScale = true;) controls this. The default setting for this is true though so if you're not explicitly setting it to false somewhere then it's probably not your problem.

There's a lot of other potential areas to troubleshoot but these should get you started.

Answer 2

I had the same issue and resolved it by setting the outScale option in conjunction with preserveScale in the PrintTemplate for the print task.

After sending multiple requests via the "Execute Task (Export Web Map Task)" REST interface and tweaking the "scale" in the mapOptions of the Web Map as JSON input it looks like a scale within 0.001 of the max scale for the basemap resulted in the basemap printing blank, so a quick test with setting outScale achieved the desired result--trying to set the scale of the map directly before printing via Map.setScale did not achieve this when I tried it, neither did feeding the result of scaleUtils.getExtentForScale to Map.setExtent and adding the deferred callbacks to trigger the print task execution.

Wanted this to apply for any basemap the map might be using so I also added a test to see whether the map scale is close to the basemap when trying to print. Example code:

var template = new esri.tasks.PrintTemplate();

// ...set other template properties...

// bump up the outScale to +1 of the basemap's maxScale if the map scale is close
var basemap = map.getLayer("layerIdOfYourBasemap");
if ((map.getScale() - basemap.maxScale) < 1) {
    template.outScale = basemap.maxScale + 1;
    template.preserveScale = true;
}

Answer 3

This issue can be related to your internet connection. Maybe you need to wait a little bit longer for the basemap to be loaded?

Another thing you can do is debugging your page with the console. For google chrome you can use the instructions on this site: https://developers.google.com/web/tools/chrome-devtools/debug/console/console-ui?hl=en#opening-the-console