nextcloud/apps/files_versions/js/versions.js

$(document).ready(function(){
	if (typeof FileActions !== 'undefined') {
		// Add versions button to 'files/index.php'
		FileActions.register(
			'file'
			, t('files_versions', 'Versions')
			, OC.PERMISSION_UPDATE
			, function() {
				// Specify icon for hitory button
				return OC.imagePath('core','actions/history');
			}
			,function(filename){
				// Action to perform when clicked
				if (scanFiles.scanning){return;}//workaround to prevent additional http request block scanning feedback

				var file = $('#dir').val()+'/'+filename;
				// Check if drop down is already visible for a different file
				if (($('#dropdown').length > 0) && $('#dropdown').hasClass('drop-versions') ) {
					if (file != $('#dropdown').data('file')) {
						$('#dropdown').hide('blind', function() {
							$('#dropdown').remove();
							$('tr').removeClass('mouseOver');
							createVersionsDropdown(filename, file);
						});
					}
				} else {
					createVersionsDropdown(filename, file);
				}
			}
		);
	}
});

function goToVersionPage(url){
	window.location.assign(url);
}

function createVersionsDropdown(filename, files) {

	var historyUrl = OC.linkTo('files_versions', 'history.php') + '?path='+encodeURIComponent( $( '#dir' ).val() ).replace( /%2F/g, '/' )+'/'+encodeURIComponent( filename );

	var html = '<div id="dropdown" class="drop drop-versions" data-file="'+escapeHTML(files)+'">';
	html += '<div id="private">';
	html += '<select data-placeholder="Saved versions" id="found_versions" class="chzen-select" style="width:16em;">';
	html += '<option value=""></option>';
	html += '</select>';
	html += '</div>';
	html += '<input type="button" value="All versions..." name="makelink" id="makelink" />';
	html += '<input id="link" style="display:none; width:90%;" />';

	if (filename) {
		$('tr').filterAttr('data-file',filename).addClass('mouseOver');
		$(html).appendTo($('tr').filterAttr('data-file',filename).find('td.filename'));
	} else {
		$(html).appendTo($('thead .share'));
	}

	$("#makelink").click(function() {
		goToVersionPage(historyUrl);
	});

	$.ajax({
		type: 'GET',
		url: OC.filePath('files_versions', 'ajax', 'getVersions.php'),
		dataType: 'json',
		data: { source: files },
		async: false,
		success: function( versions ) {

			if (versions) {
				$.each( versions, function(index, row ) {
					addVersion( row );
				});
			} else {
				$('#found_versions').hide();
				$('#makelink').hide();
				$('<div style="text-align:center;">No other versions available</div>').appendTo('#dropdown');
			}
			$('#found_versions').change(function(){
				var revision=parseInt($(this).val());
				revertFile(files,revision);
			});
		}
	});

	function revertFile(file, revision) {

		$.ajax({
			type: 'GET',
			url: OC.linkTo('files_versions', 'ajax/rollbackVersion.php'),
			dataType: 'json',
			data: {file: file, revision: revision},
			async: false,
			success: function(response) {
				if (response.status=='error') {
					OC.dialogs.alert('Failed to revert '+file+' to revision '+formatDate(revision*1000)+'.','Failed to revert');
				} else {
					$('#dropdown').hide('blind', function() {
						$('#dropdown').remove();
						$('tr').removeClass('mouseOver');
						// TODO also update the modified time in the web ui
					});
				}
			}
		});

	}

	function addVersion( revision ) {
		name=formatDate(revision.version*1000);
		var version=$('<option/>');
		version.attr('value',revision.version);
		version.text(name);

// 		} else {
// 			var checked = ((permissions > 0) ? 'checked="checked"' : 'style="display:none;"');
// 			var style = ((permissions == 0) ? 'style="display:none;"' : '');
// 			var user = '<li data-uid_shared_with="'+uid_shared_with+'">';
// 			user += '<a href="" class="unshare" style="display:none;"><img class="svg" alt="Unshare" src="'+OC.imagePath('core','actions/delete')+'"/></a>';
// 			user += uid_shared_with;
// 			user += '<input type="checkbox" name="permissions" id="'+uid_shared_with+'" class="permissions" '+checked+' />';
// 			user += '<label for="'+uid_shared_with+'" '+style+'>can edit</label>';
// 			user += '</li>';
// 		}

		version.appendTo('#found_versions');
	}

	$('tr').filterAttr('data-file',filename).addClass('mouseOver');
	$('#dropdown').show('blind');


}

$(this).click(
	function(event) {
	if ($('#dropdown').has(event.target).length === 0 && $('#dropdown').hasClass('drop-versions')) {
		$('#dropdown').hide('blind', function() {
			$('#dropdown').remove();
			$('tr').removeClass('mouseOver');
		});
	}


	}
);