var context;
var $window = $(window);

// run this right away to set context
if ($window.width() <= 768) {
    context = 'small';
} else if (768 < $window.width() < 970) {
    context = 'medium';
} else {
    context = 'large';
}

// refresh the page only if you're crossing into a context
// that isn't already set
$(window).resize(function() {
    if(($window.width() <= 768) && (context != 'small')) {
        //refresh the page
        location.reload();
    } else if ((768 < $window.width()  < 970) && (context != 'medium')) {
        location.reload();
    } else if (context != 'large') {
        location.reload();
    }
});