A common question regarding shinydashboard is how to programmatically hide/show the sidebar.
To solve this problem, I first looked at the HTML and tried to see what happens when the button to toggle the sidebar is clicked. It seems like the <body> HTML tag gains and loses a CSS class "sidebar-collapse" when the toggle button is clicked. Therefore, all we have to do to show/hide the sidebar is simply remove/add that class to the document's body tag. This can easily be done using the shinyjs package.
