UniqueValueRenderer, Legend, and Print Task
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
