How to have table-checkboxes checked by default on page load?

Summary

How to automatically check checkboxes in a table when the page has finished loading?

Content

Description
The user goes through an application and confirms some choices using checkboxes in a table. At the last page of this application, the user is provided with a table which shows an overview of the selected choices during the application. Each row in the table has a checkbox. This has been accomplished by setting the Selection Mode, Row-setting to Multiple​. 
Each checkbox is currently unchecked by default when the page has finished loading. 

Question
I want all the checkboxes in this table to be checked by