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I am facing an error for sample code I am using angular 6 and angular material for application design:
<mat-tree>
<mat-tree-node> parent node </mat-tree-node>
</mat-tree>
Error Message:
Error: Could not find a tree control for the tree
any help much appreciated.
365
The <cdk-tree> enables developers to build a customized tree experience for structured data. The <cdk-tree> provides a foundation to build other features such as filtering on top of tree. For a Material Design styled tree, see <mat-tree> which builds on top of the <cdk-tree> .
The mat-tree provides a Material Design styled tree that can be used to display hierarchy data. This tree builds on the foundation of the CDK tree and uses a similar interface for its data source input and template, except that its element and attribute selectors will be prefixed with mat- instead of cdk- .
Flat tree : In a flat tree, the hierarchy is flattened; nodes are not rendered inside of each other, but instead are rendered as siblings in sequence. Nested tree : In Nested tree, children nodes are placed inside their parent node in DOM. The parent node has an outlet to keep all the children nodes.
The documentation on Material Angular is not super clear about it...
You need tho specifie a [treeControl]="nestedTreeControl" of the type NestedTreeControl<FileNode>;
If you go to Material Angular Tree Component and check the code you will understand easily.
100
In case you really want to work with a flat tree then this error also appears when you accidentally use <mat-nested-tree-node> instead of <mat-tree-node>.
26
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