Create paginated-data-server-script.js

Author: earlduque

Service Portal Widgets/Paginated Data/paginated-data-server-script.js

@@ -0,0 +1,110 @@
+(function() {
+	// Configuration: Fields for pagination
+	data.recordsTable = 'task'; // The table name to query records from
+	data.recordsQuery = ''; // The encoded query to filter records (empty means all records)
+	data.recordsFields = ['number', 'short_description']; // The fields to retrieve for each record
+	data.recordsPerPage = 10; // Number of records to display per page
+
+	// Get pagination parameters
+	data.page_id = $sp.getParameter('id');
+	data.page = parseInt($sp.getParameter('page'), 10) || 1; // Current page number, default to 1
+	data.display = parseInt(data.recordsPerPage, 10) > 0 ? parseInt(data.recordsPerPage, 10) : 10; // Ensure positive number of records per page
+
+	// Count total records
+	var countGa = new GlideAggregate(data.recordsTable);
+	countGa.addEncodedQuery(data.recordsQuery);
+	countGa.addAggregate('COUNT');
+	countGa.query();
+	if (countGa.next()) {
+		data.count = parseInt(countGa.getAggregate('COUNT'), 10);
+	}
+
+	// Calculate pagination details
+	data.pages = calculatePaginationPages(data.count, data.display, data.page);
+
+	// Adjust current page if it exceeds the total number of pages
+	if (data.pages[data.pages.length - 1] < data.page) {
+		data.page = Math.ceil(data.count / data.display);
+	}
+
+	// Calculate the starting row for the current page
+	data.rowStart = (data.page - 1) * data.display;
+	var rowEnd = data.rowStart + data.display;
+
+	// Fetch records for the current page
+	data.records = [];
+	var recordsGr = new GlideRecord(data.recordsTable);
+	recordsGr.addEncodedQuery(data.recordsQuery);
+	recordsGr.chooseWindow(data.rowStart, rowEnd);
+	recordsGr.query();
+	while (recordsGr.next()) {
+		var record = {};
+		for (var i = 0; i < data.recordsFields.length; i++) {
+			var fieldName = data.recordsFields[i];
+			record[fieldName] = (recordsGr.getElement(fieldName) + "").trim();
+		}
+		data.records.push(record);
+	}
+
+	/**
+	 * Calculates the page numbers to display in the pagination control
+	 * @param {number} totalRecords - Total number of records
+	 * @param {number} recordsPerPage - Number of records per page
+	 * @param {number} currentPage - Current page number
+	 * @returns {Array} An array of page numbers and ellipses to display
+	 */
+	function calculatePaginationPages(totalRecords, recordsPerPage, currentPage) {
+		if (recordsPerPage <= 0) {
+			return [];
+		}
+
+		var totalPages = Math.ceil(totalRecords / recordsPerPage);
+		var pages = [];
+		var startPage, endPage;
+
+		// Determine the range of pages to display
+		if (totalPages <= 7) {
+			// If 7 or fewer pages, show all
+			startPage = 1;
+			endPage = totalPages;
+		} else {
+			// For more than 7 pages, use a sliding window
+			if (currentPage < 4) {
+				startPage = 1;
+				endPage = 5;
+			} else if (currentPage === 5) {
+				startPage = 3;
+				endPage = 7;
+			} else if (currentPage + 2 >= totalPages) {
+				startPage = totalPages - 4;
+				endPage = totalPages;
+			} else {
+				startPage = currentPage - 2;
+				endPage = currentPage + 2;
+			}
+		}
+
+		// Add first page and ellipsis if necessary
+		if (startPage > 1) {
+			pages.push(1);
+			if (startPage > 2) {
+				pages.push('...');
+			}
+		}
+
+		// Add page numbers
+		for (var i = startPage; i <= endPage; i++) {
+			pages.push(i);
+		}
+
+		// Add last page and ellipsis if necessary
+		if (endPage < totalPages) {
+			if (endPage < totalPages - 1) {
+				pages.push('...');
+			}
+			pages.push(totalPages);
+		}
+
+		return pages;
+	}
+})();