如何在Autodesk Forge中获取所有DB-ID

Question

I need to get all the DB-Ids from the Autodesk forge model. I have referred the code from https://forge.autodesk.com/cloud_and_mobile/2015/12/select-all-elements-in-the-viewer-with-view-and-data-api-with-javascript.html

I also have tried it in my own extension and the code is as follows.

 AutodeskNamespace("Autodesk.ADN.Viewing.Extension"); Autodesk.ADN.Viewing.Extension.Color = function(viewer, options) { Autodesk.Viewing.Extension.call(this, viewer, options); var _self = this; var _viewer = viewer; var instanceTree = viewer.model.getData().instanceTree; var rootId = this.rootId = instanceTree.getRootId(); _self.load = function() { getgetAlldbIds(rootId); }; function getAlldbIds(rootId) { var alldbId = []; if (!rootId) { return alldbId; } var queue = []; queue.push(rootId); while (queue.length > 0) { var node = queue.shift(); alldbId.push(node); instanceTree.enumNodeChildren(node, function(childrenIds) { queue.push(childrenIds); }); } console.log(alldbId); } }; 

But I'm getting an error in Developer Tools as cannot read property 'getData' of null where do you think I'm going wrong. thanks in advance.

Answer 1

The problem must be that the model is not fully loaded, so you should wait for that event (Autodesk.Viewing.GEOMETRY_LOADED_EVENT). It might be better to wait for the object tree created event as well (Autodesk.Viewing.OBJECT_TREE_CREATED_EVENT) - see discussion here: How to Retrieve Forge Viewer objectTree?

By the way, there is an easier way now to get all the dbIds: Get all database id's in the model