MediaWiki:Vector-2022.js

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$(function() {
    // Wrap all body children to get the body size
    $('body').children().wrapAll('<div class="mw-body-wrapper"></div>');

    // Background body overlay (configuration finished in Vector-2022.css)
    $('body').prepend('<div class="custom-bg-overlay"></div>');
    $('.custom-bg-overlay').css({'height': $('.mw-body-wrapper').height(),
                                 'position': 'absolute',
                                 'pointer-events': 'none'});

    // Header background overlay (configuration finished in Vector-2022.css)
    $('.vector-header-container').prepend('<div class="custom-header-container-overlay"></div>');
    $('.custom-header-container-overlay').css({
        'height': $('.vector-header-container').height(),
        'position': 'absolute',
        'z-index': '-1'});

    // Update on window resize

    const ro_body = new ResizeObserver(([entry]) => {
        $('.custom-bg-overlay').height($('.mw-body-wrapper').height());
    });
    ro_body.observe($('.mw-body-wrapper')[0]);

    const ro_bar = new ResizeObserver(([entry]) => {
        $('.custom-header-container-overlay').height($('.vector-header-container').height());
    });
    ro_bar.observe($('.vector-header-container')[0]);
});