UniqueValueRenderer, Legend, and Print Task

XuejinRuan — Thu, 16 Apr 2015 14:42:12 GMT

I am trying to use ArcGIS Server javascript API UniqueValueRenderer to create a thematic map for a feature service. In the feature service, I have a field called "MapCode", say, with value '01', '02', '03', '04', '05', '06' '07'....... My external code dynamically generate group membership info for each MapCode value, for example:

'group1' includes '01', '02' '03'

'group2' includes '07', '04'

'group3' includes '05', '06'

When I create the thematic map, the rendering field is 'MapCode' for the feature service. All the 'MapCode' from the same group will be rendered the same. In the legend, I want to consolidate them and label with group name.

So the code is something like the following:

renderer = new UniqueValueRenderer(null, 'MapCode');

renderer.addValue(

{

value: ‘01’,

symbol: symbol1

label: ‘Group 1’

})

renderer.addValue(

{

value: ‘02’,

symbol: symbol1

label: ‘Group 1’

})

renderer.addValue(

{

value: ‘03’,

symbol: symbol2

label: ‘Group 2'

})

......

When I create the thematic map, it looks like the way I want. It is smart enough to consolidate the legend and only show one entry for each symbol/label combination:

However, when I use PrintTask to print the map, the legend repeats, as it shows one entry for each unique 'MapCode' value.

Is there a way to modify the config or the parameters so that the legend in the Printed PDF is consolidated? I tried to intercept the "Web_Map_as_JSON" string before it is sent to the server, but could not figure out which parameter should be modified in order to get the expected output.

Thanks,

Xuejin

topic UniqueValueRenderer, Legend, and Print Task in ArcGIS JavaScript Maps SDK Questions

UniqueValueRenderer, Legend, and Print Task