26 lines
684 B
JavaScript
26 lines
684 B
JavaScript
module.exports = function () {
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var BackToTopOverlay = require( './BackToTopOverlay.js' ),
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backtotop = new BackToTopOverlay(),
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features = mw.config.get( 'wgMinervaFeatures', {} ),
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M = mw.mobileFrontend,
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mobile = M.require( 'mobile.startup' ),
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browser = mobile.Browser.getSingleton(),
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eventBus = mobile.eventBusSingleton;
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// check if browser user agent is iOS (T141598)
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if ( browser.isIos() || !features.backToTop ) {
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return;
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}
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// initialize the back to top element
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backtotop.appendTo( 'body' );
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eventBus.on( 'scroll', function () {
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if ( $( window ).height() - $( window ).scrollTop() <= 0 ) {
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backtotop.show();
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} else {
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backtotop.hide();
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}
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} );
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};
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