I had the problem in some devices the footer displayed and in others it didn't. I found this worked for me:
var initialScreenSize = window.innerHeight;
window.addEventListener("resize", function() {
if(window.innerHeight < initialScreenSize){
$("[data-role=footer]").hide();
}
else{
$("[data-role=footer]").show();
}
});
EDIT:
But what about orientation changes?
var portraitScreenHeight;
var landscapeScreenHeight;
if(window.orientation === 0 || window.orientation === 180){
portraitScreenHeight = $(window).height();
landscapeScreenHeight = $(window).width();
}
else{
portraitScreenHeight = $(window).width();
landscapeScreenHeight = $(window).height();
}
var tolerance = 25;
$(window).bind('resize', function(){
if((window.orientation === 0 || window.orientation === 180) &&
((window.innerHeight + tolerance) < portraitScreenHeight)){
// keyboard visible in portrait
}
else if((window.innerHeight + tolerance) < landscapeScreenHeight){
// keyboard visible in landscape
}
else{
// keyboard NOT visible
}
});
The tolerance accounts for the inexact calculation of landscape height with portrait width and vis-versa.