Hi there!
I don't know if you still search an Answer for this Problem, but here's what i hav done to insert two Legends from differnet Layers.
It's pretty simple
app.LegendForTemplate = new LegendLayer();
app.LegendForTemplate.layerId = "yourLayerIDhere";
app.LegendForTemplate.subLayerIds = [0,2];
and for the second Layer
app.LegendForTemplate2 = new LegendLayer();
app.LegendForTemplate2.layerId = "YourLayerID";
app.LegendForTemplate2.subLayerIds = [1,2,3];
In your Printtemplate you have to declare this two together like:
var template = new PrintTemplate();
template.layoutOptions = {
//legendLayers: [], // empty array means no legend
legendLayers: [app.LegendForTemplate,app.LegendForTemplate2],
...
Regards, Miriam
