how to initialize primeng tree component

Question

Given a tree how to initialize it in such way that the nodes are expanded at will?

I already tried to get a reference with @ViewChildren(Tree) tree

Answer 1

For initialize your tree component expanded you only need set in you json format the property expanded as true.

Sample:

{
    "data": 
    [
        {
            "label": "Pictures",
            "data": "Pictures Folder",
            "expandedIcon": "fa-folder-open",
            "collapsedIcon": "fa-folder",
            "expanded": true, // this flag shoud be true
            "children": [
                {"label": "barcelona.jpg", "icon": "fa-file-image-o", "data": "Barcelona Photo"},
                {"label": "logo.jpg", "icon": "fa-file-image-o", "data": "PrimeFaces Logo"},
                {"label": "primeui.png", "icon": "fa-file-image-o", "data": "PrimeUI Logo"}]
        },
    ]
}