Why Does Fixed Navigation Jump When the Virtual Keyboard Activates in Mobile Safari?

How to Prevent Fixed Navigation from Jumping During Virtual Keyboard Activation

Fixed navigation elements can exhibit unexpected behavior when the virtual keyboard appears in Mobile Safari. This can cause the navigation to jump to an undesirable position in the middle of the page.

The Problem

Users experience a sudden shift in the fixed navigation element's position when they focus on a text input field in the fixed navigation and the virtual keyboard appears. This is particularly noticeable when the navigation element is positioned at the bottom of the page.

The Solution

To address this bug, consider using the following CSS and JavaScript code:

CSS:

.header {
    position: fixed;
}

.footer {
    position: fixed;
}

.fixfixed .header,
.fixfixed .footer {
    position: absolute;
}

JavaScript:

if ('ontouchstart' in window) {
    /* Cache DOM references */
    var $body = $('body');

    /* Bind events */
    $(document)
    .on('focus', 'input', function() {
        $body.addClass('fixfixed');
    })
    .on('blur', 'input', function() {
        $body.removeClass('fixfixed');
    });
}

By adding the fixfixed class to the body when an input element is focused and removing it when the input is blurred, you can switch the fixed elements to position: absolute and then reset them to position: fixed when needed. This solution effectively prevents the navigation element from jumping during keyboard activation.

The above is the detailed content of Why Does Fixed Navigation Jump When the Virtual Keyboard Activates in Mobile Safari?. For more information, please follow other related articles on the PHP Chinese website!