iOS 11 Safari bootstrap modal text area outside of cursor

Question

With iOS 11 safari, input textbox cursor are outside of input textbox. We did not get why it is having this problem. As you can see my focused text box is email text input b

Answer 1

Those solutions using position: fixed and position correction based on scrollTop work really well, but some people (including me) got another issue: keyboard caret/cursor not showing when inputs are focused.

I observed that caret/cursor works only when we DON'T use position: fixed on body. So after trying several things, I gave up on using this approach and decided to use position: relative on body and use scrollTop to correct modal's top position instead.

See code below:

var iosScrollPosition = 0;

function isIOS() {
   // use any implementation to return true if device is iOS
}

function initModalFixIOS() {
    if (isIOS()) {
        // Bootstrap's fade animation does not work with this approach
        // iOS users won't benefit from animation but everything else should work
        jQuery('#myModal').removeClass('fade');
    }
}

function onShowModalFixIOS() {
    if (isIOS()) {
        iosScrollPosition = jQuery(window).scrollTop();
        jQuery('body').css({
            'position': 'relative', // body is now relative
            'top': 0
        });
        jQuery('#myModal').css({
            'position': 'absolute', // modal is now absolute
            'height': '100%',
            'top': iosScrollPosition // modal position correction
        });
        jQuery('html, body').css('overflow', 'hidden'); // prevent page scroll
    }
}

function onHideModalFixIOS() {
    // Restore everything
    if (isIOS()) {
        jQuery('body').css({
            'position': '',
            'top': ''
        });
        jQuery('html, body').scrollTop(iosScrollPosition);
        jQuery('html, body').css('overflow', '');
    }
}

jQuery(document).ready(function() {
    initModalFixIOS();
    jQuery('#myModal')
        .on('show.bs.modal', onShowModalFixIOS)
        .on('hide.bs.modal', onHideModalFixIOS);
});