Hello-World-Component/media/uikit-v2/js/core/cover.js

/*! UIkit 2.27.5 | http://www.getuikit.com | (c) 2014 YOOtheme | MIT License */
(function(UI){

    "use strict";

    UI.component('cover', {

        defaults: {
            automute : true
        },

        boot: function() {

            // auto init
            UI.ready(function(context) {

                UI.$('[data-uk-cover]', context).each(function(){

                    var ele = UI.$(this);

                    if(!ele.data('cover')) {
                        var plugin = UI.cover(ele, UI.Utils.options(ele.attr('data-uk-cover')));
                    }
                });
            });
        },

        init: function() {

            this.parent = this.element.parent();

            UI.$win.on('load resize orientationchange', UI.Utils.debounce(function(){
                this.check();
            }.bind(this), 100));

            this.on('display.uk.check', function(e) {
                if (this.element.is(':visible')) this.check();
            }.bind(this));

            this.check();

            if (this.element.is('iframe') && this.options.automute) {

                var src = this.element.attr('src');

                this.element.attr('src', '').on('load', function(){
                    this.contentWindow.postMessage('{ "event": "command", "func": "mute", "method":"setVolume", "value":0}', '*');
                }).attr('src', [src, (src.indexOf('?') > -1 ? '&':'?'), 'enablejsapi=1&api=1'].join(''));
            }
        },

        check: function() {

            this.element.css({ width  : '', height : '' });

            this.dimension = {w: this.element.width(), h: this.element.height()};

            if (this.element.attr('width') && !isNaN(this.element.attr('width'))) {
                this.dimension.w = this.element.attr('width');
            }

            if (this.element.attr('height') && !isNaN(this.element.attr('height'))) {
                this.dimension.h = this.element.attr('height');
            }

            this.ratio = this.dimension.w / this.dimension.h;

            var w = this.parent.width(), h = this.parent.height(), width, height;

            // if element height < parent height (gap underneath)
            if ((w / this.ratio) < h) {

                width  = Math.ceil(h * this.ratio);
                height = h;

            // element width < parent width (gap to right)
            } else {

                width  = w;
                height = Math.ceil(w / this.ratio);
            }

            this.element.css({ width  : width, height : height });
        }
    });

})(UIkit2);