We can use its onChanged property to interact or modify other widgets in the flutter app. Workspace and project structure. Now we will go though the simple example to understand further. source is nothing but source of the mat-checkbox from which the event triggered. Use the following steps to get checked checkbox values in angular 13 apps: Step 1 Create New Angular App; Step 2 Add Code on Module.ts File Then add the checkUncheckAll(), isAllSelected() and getCheckedItemList() methods. npm Find its declaration from Angular doc. Angular 13 Checkbox Checked Event Example. Since a