Should a Select all checkbox become selected if all checkboxes are selected?

The answer is a big 'Yes'. If the user is selecting all the checkboxes individually and once all the items have checked the select all checkbox should also be checked.

1. How should a select all checkbox work?
2. How do I select all tick boxes at once?
3. How can we check if a checkbox is selected or not?

How should a select all checkbox work?

The select all checkbox only works when the checkboxes are unselected. In other words, once a user selects one or more of the checkboxes then the main select all checkbox won't work.

How do I select all tick boxes at once?

Simply check or uncheck multiple checkboxes at a time by clicking and dragging. Allows you to check multiple checkboxes quickly by CLICKING & DRAGGING or even quicker with an ALT+CLICK & DRAG area select.

How can we check if a checkbox is selected or not?

In order to check if a checkbox is checked or unchecked, we can used the isSelected() method over the checkbox element. The isSelected() method returns a boolean value of true if the checkbox is checked false otherwise.