Custom visual drill down in multiple roles

Question

Hi,&nbsp;I have modified the Flow Map custom visual&nbsp; from Weiweicui to see if I can make aggregations work in a hierarchy, so a user can drill down/up from a location to country, region, etc in the same chart. The flow map build the lines from a source and destination, that is, two roles. I want the users to be able to drill down in using both, so a user can see a flow for example from a Country to a Port, and rill down to see from a Port to Port, or Country to Country, etc.&nbsp;I edited the capabilities.json and added the following:&nbsp;&nbsp;&nbsp;&nbsp; "drilldown": {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "roles": ["Origin", "Dest"]&nbsp;&nbsp;&nbsp; },&nbsp;The chart now shows a new widget like below and seems to work fine. The only problem is that the labels in the dropdown don’t appear. I expect these to be Origin and &nbsp;Destination, but instead they are ‘undefined’&nbsp;See below:&nbsp;&nbsp;When inspecting the element the label atributes of the select element are undefined. See below:&nbsp;&nbsp;Can you think of where I look into to fix this. I tried finding documentation about this widget but could not find.&nbsp;Thanks,Alexis

alexisc67 · Answer

Hi,&nbsp;I have modified the Flow Map custom visual&nbsp; from Weiweicui to see if I can make aggregations work in a hierarchy, so a user can drill down/up from a location to country, region, etc in the same chart. The flow map build the lines from a source and destination, that is, two roles. I want the users to be able to drill down in using both, so a user can see a flow for example from a Country to a Port, and rill down to see from a Port to Port, or Country to Country, etc.&nbsp;I edited the capabilities.json and added the following:&nbsp;&nbsp;&nbsp;&nbsp; "drilldown": {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "roles": ["Origin", "Dest"]&nbsp;&nbsp;&nbsp; },&nbsp;The chart now shows a new widget like below and seems to work fine. The only problem is that the names in the dropdowns don’t appear. I expect these to be Origin and &nbsp;Destination, but instead they are ‘undefined’&nbsp;See below:&nbsp;&nbsp;&nbsp;Can you think of where I look into to fix this. I tried finding documentation about this widget but could not find.&nbsp;Thanks,Alexis

alexisc67 · Answer

Hi,Here is the inspected select element. The labels are undefined, but the values are correct, therefore the drill downs work.&nbsp;Thanks,Alexis

v-viig · Answer

Hi&nbsp;alexisc67,
&nbsp;
Looks like Drill-down by multi columns is not supported by Power BI Custom Visuals API.
&nbsp;
Have you tried to specify a single column name instead two columns?
&nbsp;
Ignat Vilesov,
Software Engineer
&nbsp;
Microsoft Power BI Custom Visuals
pbicvsupport@microsoft.com

alexisc67 · Answer

Hi Ignat,&nbsp;It seems it is suportted. It is just the labels in the drop down that do not show. The functionality is there. I am able to drill down in the two columns with success. The first one is the origin an the second is the destination.The code seems to be there to support it but with a defect on the labels as you can see in the screenshot above with the select xml element. I don't think this is custom code for the visual, I think this widget is in the core Power BI. Can you check that?In the screenshot below you can see a function/property $ctrl.canDrillOnMoreThanOneRole()&nbsp;&nbsp;Thanks,Alexis

alexisc67 · Answer

Hi&nbsp;v-viig,&nbsp;I also added the same code to the Sankey diagram. See below. The same happens with the labels, but the funcitonality is good, i can drill in Source and Destination. I hope you can find some informaiton about this.&nbsp;

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Custom visual drill down in multiple roles

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