Data source not available in preview

Question

Experience Builder Dev Edition 1.8.0

I have a custom widget where I use DataSourceManager to access a specific data source.  The odd thing is all my code works fine when I use the Live View mode in Exp Builder but fails when I preview the app.

When I console DataSourceManager.getInstance() in Exp Builder I can see my data source in the DataSources object but when I do that in preview the data source is not there.

Is there something I need to do to force the data source to be available in preview?

YueyangLi · Answer

@PartyPelican It is expected DataSourceManager.getInstance().createDataSource() fails to create a layer data source. DataSourceManager needs a rootDataSourceId to know which map the layer belongs to.

We recommend using  DataSourceManager.getInstance().createDataSourceByUseDataSource({ dataSourceId: layerDataSourceId, mainDataSourceId: layerDataSourceId, rootDataSourceId: mapDataSourceId }).

PartyPelican · Answer

The createLayerDataSource method worked for me, but I don't actually see this method documented by ESRI. I do see the DataSourceManager methods for creating a datasource but when trying to pass the layerDataSourceId to DataSourceManager.getInstance().createDataSource() I get the error that the datasource could not be created. Do you know why that is?

QunSun · Answer

Hi @PartyPelican ,

For performance reason, JimuLayerView will not automatically create data source. If data source has been created by some widgets, then JimuLayerView.getLayerDataSource() gets the data source. If the data source has not been created, you can create the data source through the asynchronous method JimuLayerView.createLayerDataSource().