MediaWiki:Gadget-scrollUpButton.js
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Note: After publishing, you may have to bypass your browser's cache to see the changes.
- Firefox / Safari: Hold Shift while clicking Reload, or press either Ctrl-F5 or Ctrl-R (⌘-R on a Mac)
- Google Chrome: Press Ctrl-Shift-R (⌘-Shift-R on a Mac)
- Internet Explorer / Edge: Hold Ctrl while clicking Refresh, or press Ctrl-F5
- Opera: Press Ctrl-F5.
;(function() {
function updateClass() {
if (document.body.scrollTop > 0 || document.documentElement.scrollTop > 0) {
button.classList = 'top-link show';
} else {
button.classList = 'top-link hide';
}
}
const button = document.createElement('div');
button.addEventListener('click', function() {
document.body.scrollTop = 0; // For Safari
document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
});
updateClass();
window.addEventListener('scroll', updateClass, { passive: true });
document.body.appendChild(button);
})();