/* scrollUpButton  * Add a button to scroll up to the top of the current page.  * @rev 3 (2019-28-07)  * @author Kwj2772  * @contributor Perhelion  * No internationalisation required  * [kowiki] Fixed an issue with help-panel-button ([[ko:User:ykhwong]])  * [zhwiki] Add a timer to autohide button, check more gadgets. Add scrollDownButton  *   @from https://ko.wikipedia.org/?oldid=25440719  *   @maintainer 安忆 ([[zh:User:AnYiLin]])  */ (function($, mw) { 	var scrollDownButtonId = 'scrollDownButton', 		scrollUpButtonId = 'scrollUpButton'; 	if (mw.config.get('wgServerName').match(/wikimirror\.org$/)) { 		scrollDownButtonId += '-zhwiki'; 		scrollUpButtonId += '-zhwiki' 	}  	var scrollButtonIcon = '//upload.wikimedia.org/wikipedia/commons/5/59/Font_Awesome_5_regular_arrow-circle-up_blue.svg'; 	if (!document.implementation.hasFeature('http://www.w3.org/TR/SVG11/feature#Image', '1.1')) 		scrollButtonIcon = '//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Font_Awesome_5_regular_arrow-circle-up_blue.svg/32px-Font_Awesome_5_regular_arrow-circle-up_blue.svg.png';  	$scrollDownButton = $('<img>', { 		src: scrollButtonIcon, 		id: scrollDownButtonId 	}).css({ 		cursor: 'pointer', 		opacity: 0.7, 		position: 'fixed', 		display: 'none', 		right: '18px', 		transform: 'rotate(180deg)', 		'-webkit-transform': 'rotate(180deg)', 		'-moz-transform': 'rotate(180deg)', 		'-o-transform': 'rotate(180deg)', 		'-ms-transform': 'rotate(180deg)' 	}).on('click', function() { 		$('html, body').animate({ 			scrollTop: $(document).height() - $(window).height() 		}, 660) 	}).on('mouseenter mouseleave', function(e) { 		this.style.opacity = e.type === 'mouseenter' ? 1 : 0.7 	}).appendTo('body');  	$scrollUpButton = $('<img>', { 		src: scrollButtonIcon, 		id: scrollUpButtonId 	}).css({ 		cursor: 'pointer', 		opacity: 0.7, 		position: 'fixed', 		display: 'none', 		right: '18px' 	}).on('click', function() { 		$('html, body').animate({ 			scrollTop: 0 		}, 660) 	}).on('mouseenter mouseleave', function(e) { 		this.style.opacity = e.type === 'mouseenter' ? 1 : 0.7 	}).appendTo('body');  	var scrollButtonTimer; 	$(window).on('scroll', function() { 		var dingHeight = $('#bluedeck_ding>div').height() ? $('#bluedeck_ding>div').height() : 0; 		$('#mw-ge-help-panel-cta-button').length > 0 ? $scrollDownButton.css('bottom', dingHeight + 75 + 'px') && $scrollUpButton.css('bottom', dingHeight + 116 + 'px') : $scrollDownButton.css('bottom', dingHeight + 24 + 'px') && $scrollUpButton.css('bottom', dingHeight + 65 + 'px'); 		$('#cat_a_lot').length > 0 || $('#proveit').length > 0 || $('.wordcount').length > 0 ? $scrollDownButton.css('left', '10px') && $scrollUpButton.css('left', '10px') : $scrollDownButton.css('left', 'unset') && $scrollUpButton.css('left', 'unset'); 		$(this).scrollTop() > 60 ? $scrollDownButton.fadeIn('slow') && $scrollUpButton.fadeIn('slow') : $scrollDownButton.fadeOut('slow') && $scrollUpButton.fadeOut('slow'); 		this.clearTimeout(scrollButtonTimer); 		scrollButtonTimer = this.setTimeout(function() { 			$scrollDownButton.fadeOut('slow'); 			$scrollUpButton.fadeOut('slow') 		}, 2000) 	}); 	$scrollDownButton.on('mouseenter', function() { 		window.clearTimeout(scrollButtonTimer) 	}); 	$scrollUpButton.on('mouseenter', function() { 		window.clearTimeout(scrollButtonTimer) 	}) })(jQuery, mw);