How to filter a mat-tree component Angular Material 6.0.1

Question

I\'m using mat-tree angular material component. It\'s a nice component with some very useful features like, multi-select, expand all/collapse all. I was not able to find any

Answer 1

I solved the problem by creating a new data source(filtered).

stackblitz sample

I will explain the example of the shared link: I filtered the data with filter(filterText: string) in ChecklistDatabase and triggered a dataChange event. Then datasource.data was changed by a handled event in TreeChecklistExample. Thus the data source has been modified.

filter(filterText: string) {
  let filteredTreeData;

  if (filterText) {
    filteredTreeData = this.treeData.filter(
      //There is filter function in the sample
    );
  } else {
    filteredTreeData = this.treeData;
  }

  // file node as children.
  const data = this.buildFileTree(filteredTreeData, '0');

  // Notify the change. !!!IMPORTANT
  this.dataChange.next(data);
}