Angular2 UL/LI JSON-tree recursive in ngFor
Borrowing from Torgeir Helgevold's post, I came up with this Plunkr. Here's the code:
TreeView Component:
import {Component, Input} from 'angular2/core';
@Component ({
selector: 'tree-view',
directives: [TreeView],
template: `
<ul>
<li *ngFor="#node of treeData">
{{node.name}}
<tree-view [treeData]="node.subnodes"></tree-view>
</li>
</ul>
`
})
export class TreeView {
@Input() treeData: [];
}
App Component:
import {Component} from 'angular2/core';
import {TreeView} from './tree-view.component';
@Component({
selector: 'my-app',
directives: [TreeView],
template: `
<h1>Tree as UL</h1>
<tree-view [treeData]="myTree"></tree-view>
`
})
export class AppComponent {
myTree = [
{name:"parent1", subnodes:[]},
{name:"parent2",
subnodes:[
{name:"parent2_child1", subnodes:[]}
],
{name:"parent3",
subnodes:[
{name:"parent3_child1",
subnodes:[
{name:"parent3_child1_child1", subnodes:[]}
]
}
]
}
];
}
You don't need to make a new tree-view
component to do this, you can simply use this pattern in any of your templates:
If your data array was public property list
of your component:
<h1>Angular 2 Recursive List</h1>
<ul>
<ng-template #recursiveList let-list>
<li *ngFor="let item of list">
{{item.name}}
<ul *ngIf="item.children.length > 0"> <!-- item.subnodes.length -->
<ng-container *ngTemplateOutlet="recursiveList; context:{ $implicit: item.children }"></ng-container>
</ul>
</li>
</ng-template>
<ng-container *ngTemplateOutlet="recursiveList; context:{ $implicit: list }"></ng-container>
</ul>
Here's a gist.