Returns the data object that was passed to a lightbox.
について getContext() function returns the data object passed when the lightbox
was opened using the openLightbox() function,
if any data was passed. If the lightbox was opened another way,
getContext() returns undefined.
To pass data to the lightbox that is opened, you must open the lightbox
programmatically using the openLightbox()
function. If the lightbox is opened automatically when the page loads or
by a link from a page element, data will not be passed to the lightbox.
Therefore, if you want to pass data to the lightbox, make sure
Automatically display lightbox on pages is set to いいえ in the
Lightbox Settings panel in the Editor and don't set any element's link
to open the lightbox. Instead, create your own method for opening
the lightbox programmatically. For example, you can add a button with an onClick event
handler that calls the openLightbox() 関数である。