How to get the selected equipment object id - autodesk-forge

Question

we have used forge Aggregate Viewer to display the multiple BIM models. But if we click/double click any of the equipment in the Aggregate Forge Viewer the equipment will be zoomed.
but not able to get the selected equipment object id by using the c# code.
Note: If we upload the single file, we are able to get the selected equipment object id in the Forge Viewer.
We used below code, but its not get hitted when we select equipment.
viewer.addEventListener(Autodesk.Viewing.SELECTION_CHANGED_EVENT, (args) => {
Kindly help us to get the selected equipment object id in Aggregate Forge View while displaying the multiple files.
Kindly share the sample code for our reference.
FITTOVIEW AND SELECTION CHANGE CODE
const Loadedevent = () => {
var objval = document.getElementById('<%=hid_objectid.ClientID%>').value;
if (objval != '') {
var mdlurn = "";
mdlurn = document.getElementById('<%=hid_mdlurn.ClientID%>').value;
const models = viewer.getVisibleModels().find(m => m.getData().urn === mdlurn);
viewer.fitToView([parseInt(objval)], models);
viewer.select([parseInt(objval)], models, Autodesk.Viewing.SelectionType.OVERLAYED);
}
}
SelectionChangeEvent
viewer.addEventListener(Autodesk.Viewing.AGGREGATE_SELECTION_CHANGED_EVENT, (args) => {
if (args.dbIdArray.length === 1) {
viewer.getProperties(args.dbIdArray[0], function (data) {
if (FromPage == '') {
if (FromSelection == '') {
if (Count === 0) {
var instanceTree = viewer.model.getData().instanceTree;
var parentId = instanceTree.getNodeParentId(args.dbIdArray[0]);
viewer.select([parentId], viewer.model, Autodesk.Viewing.SelectionType.OVERLAYED);
Count = 1;
} else {
itemobject = args.dbIdArray[0];
Count = 0;
}
} else {
FromSelection = '';
itemobject = args.dbIdArray[0];
}
} else {
FromPage = '';
itemobject = args.dbIdArray[0];
}
});
}
});
Edited Code:
viewer.addEventListener(Autodesk.Viewing.AGGREGATE_SELECTION_CHANGED_EVENT, (args) => {
if (!args.selections || args.selections.length <= 0)
return;
if (args.selections.length == 1 ) {
viewer.getProperties(args.selections[0].dbIdArray[0], function (data) {
if (FromPage == '') {
if (FromSelection == '') {
if (Count === 0) {
var instanceTree = viewer.model.getData().instanceTree;
var parentId = instanceTree.getNodeParentId(args.selections[0].dbIdArray);
viewer.select([parentId], viewer.model, Autodesk.Viewing.SelectionType.OVERLAYED);
Count = 1;
} else {
const dbIds = args.selections[0].dbIdArray;
itemobject = dbIds[0];
Count = 0;
}
} else {
FromSelection = '';
const dbIds = args.selections[0].dbIdArray;
itemobject = dbIds[0];
}
} else {
FromPage = '';
const dbIds = args.selections[0].dbIdArray;
itemobject = dbIds[0];
}
});
}
});

Answer 1

In the multiple models scenario, you must use Autodesk.Viewing.AGGREGATE_SELECTION_CHANGED_EVENT instead. See https://forge.autodesk.com/blog/multi-model-refresher
/**
* Triggered when objects are selected or deselected.
* Event payload:
* {
* type: 'aggregateSelection',
* target: Viewer3D,
* selections: Array<{
* model: Model,
* nodeArray: Array<number>,
* dbIdArray: Array<number>,
* fragIdsArray: Array<number>
* }>
* }
*/
viewer.addEventListener(
Autodesk.Viewing.AGGREGATE_SELECTION_CHANGED_EVENT,
(event) => {
// codes for selecting changed
});
To get selected objects, call viewer.getAggregateSelection() instead.
Update
Here are the revised code snippets for you:
FITTOVIEW AND SELECTION CHANGE CODE
const Loadedevent = () => {
let objval = document.getElementById('<%=hid_objectid.ClientID%>').value;
if (objval != '') {
let mdlurn = "";
mdlurn = document.getElementById('<%=hid_mdlurn.ClientID%>').value;
let model = viewer.getVisibleModels().find(m => m.getData().urn === mdlurn); //!<<< find() will return first found item only, so defining the variable in the singular form instead to avoid confusion.
let dbId = parseInt( objval );
viewer.select( [ dbId ] , model, Autodesk.Viewing.SelectionType.OVERLAYED );
// or viewer.setAggregateSelection([ { ids: [ dbId ], model, selectionType: Autodesk.Viewing.SelectionType.OVERLAYED } ]);
viewer.fitToView( [ dbId ], model );
}
}
SelectionChangeEvent
viewer.addEventListener(Autodesk.Viewing.AGGREGATE_SELECTION_CHANGED_EVENT, (event) => {
if (!event.selections || event.selections.length <= 0 || event.selections.length > 1)
return;
let selSet = event.selections[0];
const dbIds = selSet.dbIdArray;
const model = selSet.model;
const dbId = dbIds[0];
model.getProperties(dbId, function(data) {
if (FromPage == '') {
if (FromSelection == '') {
if (Count === 0) {
let instanceTree = model.getInstanceTree();
let parentId = instanceTree.getNodeParentId(dbId);
viewer.select(parentId, model, Autodesk.Viewing.SelectionType.OVERLAYED);
// or viewer.setAggregateSelection([ { ids: [parentId ], model, selectionType: Autodesk.Viewing.SelectionType.OVERLAYED } ])
Count = 1;
} else {
itemobject = dbId;
Count = 0;
}
} else {
FromSelection = '';
itemobject = dbId;
}
} else {
FromPage = '';
itemobject = dbId;
}
});
});