How can I prevent the user from deselecting all the checkboxes?

1. How do I stop a checkbox from being unchecked?
2. How do I unselect all checkboxes?
3. How to prevent checkbox from being unchecked in angular?

How do I stop a checkbox from being unchecked?

Use the preventDefault() method to stop the default behavior of a particular element.

How do I unselect all checkboxes?

A group of checkboxes exists on a page, which can be controlled by a single checkbox. Clicking on the master checkbox selects all checkboxes and unchecking it deselects all.

How to prevent checkbox from being unchecked in angular?

ngModelChange is fired when value binded to checkbox has changed, it's late for stop the toggle operation. Here you should bind with click event. Then you can use $event. preventDefault() to stop checkbox from been toggled.