I was also looking for such an event, but here is the best I found. Scripts don't work well with events, and to create plugin is too expensive...
File name: displayedPage.jsx
#targetengine displayedPage
/**
Put this file into "startup scripts" and reload ID.
When you change active page the message about page number appears...
However, the page becomes active only if a selection appears on it.
Unfortunately simple scrolling does not trigger an events.
*/
function displayedPage(){
app.addEventListener('afterOpen', function(event){
if (event.parent instanceof LayoutWindow) {
var aDoc = app.activeDocument;
var lWindow = event.parent;
alert('Document name: ' + app.activeDocument.name);
lWindow.addEventListener('afterAttributeChanged', function(wevent){
var l_window = wevent.parent;
alert("Displayed Page: " + l_window.activePage.name);
});
}
});
/**
This function is required, otherwise, the script will work even after deletion!
*/
app.addEventListener('beforeQuit', function(){
app.eventListeners.everyItem().remove();
});
}
displayedPage();
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