tree.treeModel.roots returns []

I want to collapse, expand roots after initialization.

I have initialized a tree with 1 root, which has several children. I have defined the tree as a ViewChild, and after console.logging the tree I can see in the console, that roots in treeModel is an array of length 1. But after console.logging tree.treeModel.roots I get empty array.

[adamkleingit]

I’m assuming you initialize reports with an empty array, and only later initialize it with data? You have 3 options:

1. Use *ngIf to show tree only if reports has data
2. Initialize reports with null instead of empty array.
3. Use onUpdateData event instead of onInitialized (notice that every time you update the pointer to reports this event will fire)

• Adam Klein http://il.linkedin.com/in/adamklein500
• CTO @ 500Tech.com http://500tech.com/
• AngularJS, ReactJS, NodeJS
• Development, consulting, training and public speaking
• ([phone]

On Tue, Sep 27, 2016 at 12:34 PM, Alexander Ciesielski < [e-mail]> wrote:

html

<div class="report-tree-container"> <Tree #reportsTree [nodes]="reports" (onInitialized)="onTreeInitialized($event)" (onActiveChanged)="onActiveChanged($event)"> </Tree> </div>

ts

@ViewChild(‘reportsTree’) reportsTree: TreeComponent; @Input() reports: ReportTreeNode[];

onTreeInitialized() { console.log(this.reportsTree.treeModel); console.log(this.reportsTree.treeModel.roots); }

export interface ReportTreeNode { name: string;

id?: number;
children?: ReportTreeNode[];

}

Same result as above

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/500tech/angular2-tree-component/issues/58#issuecomment-249815190, or mute the thread https://github.com/notifications/unsubscribe-auth/AA2SSm-zDXYQT_D8OvVmb6a2cUQjJv9gks5quOMQgaJpZM4KDwaa .

[alexciesielski]

reports is initialized by parent component with async pipe.

<app-report-list [reports]="reports | async" (select)="selectReport($event)">
</app-report-list>

Using onUpdateData instead of onInitialized fixed the issue, makes sense! Thanks!