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docs(tree): fix example that shows empty checklists as selected #20106

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merged 1 commit into from
Jul 27, 2020
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docs(tree): fix example that shows empty checklists as selected #20106

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18 changes: 8 additions & 10 deletions src/components-examples/material/tree/tree-checklist/tree-checklist-example.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -162,7 +162,7 @@ export class TreeChecklistExample {
: new TodoItemFlatNode();
flatNode.item = node.item;
flatNode.level = level;
flatNode.expandable = !!node.children;
flatNode.expandable = !!node.children?.length;
this.flatNodeMap.set(flatNode, node);
this.nestedNodeMap.set(node, flatNode);
return flatNode;
Expand All @@ -171,9 +171,9 @@ export class TreeChecklistExample {
/** Whether all the descendants of the node are selected. */
descendantsAllSelected(node: TodoItemFlatNode): boolean {
const descendants = this.treeControl.getDescendants(node);
const descAllSelected = descendants.every(child =>
this.checklistSelection.isSelected(child)
);
const descAllSelected = descendants.length > 0 && descendants.every(child => {
return this.checklistSelection.isSelected(child);
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nit: why add the {} and return?

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I just find it more readable compared to the multi-line arrow function with an implicit return.

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I prefer the implicit return, but I don't think we have an official style on way or the other

});
return descAllSelected;
}

Expand All @@ -193,9 +193,7 @@ export class TreeChecklistExample {
: this.checklistSelection.deselect(...descendants);

// Force update for the parent
descendants.every(child =>
this.checklistSelection.isSelected(child)
);
descendants.forEach(child => this.checklistSelection.isSelected(child));
this.checkAllParentsSelection(node);
}

Expand All @@ -218,9 +216,9 @@ export class TreeChecklistExample {
checkRootNodeSelection(node: TodoItemFlatNode): void {
const nodeSelected = this.checklistSelection.isSelected(node);
const descendants = this.treeControl.getDescendants(node);
const descAllSelected = descendants.every(child =>
this.checklistSelection.isSelected(child)
);
const descAllSelected = descendants.length > 0 && descendants.every(child => {
return this.checklistSelection.isSelected(child);
});
if (nodeSelected && !descAllSelected) {
this.checklistSelection.deselect(node);
} else if (!nodeSelected && descAllSelected) {
Expand Down