Autodesk-XLSExtension, undefined viewer - autodesk-forge

Question

Im trying to implement the XLS Extension. In the ModelData class, i cannot get objects leaf nodes because the viewer is undefined.
Here is the problematic method:
getAllLeafComponents(callback) {
// from https://learnforge.autodesk.io/#/viewer/extensions/panel?id=enumerate-leaf-nodes
viewer.getObjectTree(function (tree) {
let leaves = [];
tree.enumNodeChildren(tree.getRootId(), function (dbId) {
if (tree.getChildCount(dbId) === 0) {
leaves.push(dbId);
}
}, true);
callback(leaves);
});
}
Im getting Cannot read properties of undefined (reading 'getObjectTree') , meaning viewer is undefined.
However, viewer is working and displaying documents.
I tried to call it by window.viewer and this.viewer to no avail.
Thanks in advance for any help

Answer 1

It looks like it missed two lines. Could you try the revised one below?
// Model data in format for charts
class ModelData {
constructor(viewer) {
this._modelData = {};
this._viewer = viewer;
}
init(callback) {
var _this = this;
var viewer = _this._viewer;
_this.getAllLeafComponents(function (dbIds) {
var count = dbIds.length;
dbIds.forEach(function (dbId) {
viewer.getProperties(dbId, function (props) {
props.properties.forEach(function (prop) {
if (!isNaN(prop.displayValue)) return; // let's not categorize properties that store numbers
// some adjustments for revit:
prop.displayValue = prop.displayValue.replace('Revit ', ''); // remove this Revit prefix
if (prop.displayValue.indexOf('<') == 0) return; // skip categories that start with <
// ok, now let's organize the data into this hash table
if (_this._modelData[prop.displayName] == null) _this._modelData[prop.displayName] = {};
if (_this._modelData[prop.displayName][prop.displayValue] == null) _this._modelData[prop.displayName][prop.displayValue] = [];
_this._modelData[prop.displayName][prop.displayValue].push(dbId);
})
if ((--count) == 0) callback();
});
})
})
}
getAllLeafComponents(callback) {
var _this = this;
var viewer = _this._viewer;
// from https://learnforge.autodesk.io/#/viewer/extensions/panel?id=enumerate-leaf-nodes
viewer.getObjectTree(function (tree) {
var leaves = [];
tree.enumNodeChildren(tree.getRootId(), function (dbId) {
if (tree.getChildCount(dbId) === 0) {
leaves.push(dbId);
}
}, true);
callback(leaves);
});
}
hasProperty(propertyName){
return (this._modelData[propertyName] !== undefined);
}
getLabels(propertyName) {
return Object.keys(this._modelData[propertyName]);
}
getCountInstances(propertyName) {
return Object.keys(this._modelData[propertyName]).map(key => this._modelData[propertyName][key].length);
}
getIds(propertyName, propertyValue) {
return this._modelData[propertyName][propertyValue];
}
}