[FIX] xlsx: fix table total row export

src/xlsx/functions/table.ts

@@ -76,6 +76,15 @@ function addTableColumns(table: ExcelTableData, sheetData: ExcelSheetData): XMLS
       ["id", i + 1], // id cannot be 0
       ["name", colName],
     ];
+    if (table.config.totalRow) {
+      // Note: To be 100% complete, we could also add a `totalsRowLabel` attribute for total strings, and a tag
+      // `<totalsRowFormula>` for the formula of the total. But those doesn't seem to be mandatory for Excel.
+      const colTotalXc = toXC(tableZone.left + i, tableZone.bottom);
+      const colTotalContent = sheetData.cells[colTotalXc]?.content;
+      if (colTotalContent?.startsWith("=")) {
+        colAttributes.push(["totalsRowFunction", "custom"]);
+      }
+    }
     columns.push(escapeXml/*xml*/ `<tableColumn ${formatAttributes(colAttributes)}/>`);
   }
 

src/xlsx/functions/worksheet.ts

@@ -105,11 +105,12 @@ export function addRows(
           ({ attrs: additionalAttrs, node: cellNode } = addContent(label, construct.sharedStrings));
         } else if (cell.content && cell.content !== "") {
           const isTableHeader = isCellTableHeader(c, r, sheet);
+          const isTableTotal = isCellTableTotal(c, r, sheet);
           const isPlainText = !!(cell.format && data.formats[cell.format] === PLAIN_TEXT_FORMAT);
           ({ attrs: additionalAttrs, node: cellNode } = addContent(
             cell.content,
             construct.sharedStrings,
-            isTableHeader || isPlainText
+            isTableHeader || isTableTotal || isPlainText
           ));
         }
         attributes.push(...additionalAttrs);
@@ -148,6 +149,17 @@ function isCellTableHeader(col: HeaderIndex, row: HeaderIndex, sheet: ExcelSheet
   });
 }
 
+function isCellTableTotal(col: HeaderIndex, row: HeaderIndex, sheet: ExcelSheetData): boolean {
+  return sheet.tables.some((table) => {
+    if (!table.config.totalRow) {
+      return false;
+    }
+    const zone = toZone(table.range);
+    const totalZone = { ...zone, top: zone.bottom };
+    return isInside(col, row, totalZone);
+  });
+}
+
 export function addHyperlinks(
   construct: XLSXStructure,
   data: ExcelWorkbookData,

tests/xlsx/__snapshots__/xlsx_export.test.ts.snap

@@ -19095,11 +19095,12 @@ exports[`Test XLSX export Export data filters Export data filters snapshot 1`] =
 
 exports[`Test XLSX export Export data filters Table style is correctly exported 1`] = `
 {
-  "content": "<table id="1" name="Table1" displayName="Table1" ref="A1:A4" headerRowCount="1" totalsRowCount="1" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006">
-    <autoFilter ref="A1:A4">
+  "content": "<table id="1" name="Table1" displayName="Table1" ref="A1:B4" headerRowCount="1" totalsRowCount="1" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006">
+    <autoFilter ref="A1:B4">
     </autoFilter>
-    <tableColumns count="1">
+    <tableColumns count="2">
         <tableColumn id="1" name="Column0"/>
+        <tableColumn id="2" name="Column1" totalsRowFunction="custom"/>
     </tableColumns>
     <tableStyleInfo name="TableStyleMedium9" showFirstColumn="1" showLastColumn="1" showRowStripes="1" showColumnStripes="1"/>
 </table>",

tests/xlsx/xlsx_export.test.ts

@@ -1494,7 +1494,7 @@ describe("Test XLSX export", () => {
 
     test("Table style is correctly exported", async () => {
       const model = new Model();
-      createTable(model, "A1:A4", {
+      createTable(model, "A1:B4", {
         totalRow: true,
         firstColumn: true,
         lastColumn: true,
@@ -1503,6 +1503,8 @@ describe("Test XLSX export", () => {
         bandedColumns: true,
         styleId: "TableStyleMedium9",
       });
+      setCellContent(model, "A4", "5");
+      setCellContent(model, "B4", "=65+9");
       const exported = await exportPrettifiedXlsx(model);
       const tableFile = exported.files.find((file) => file.path === "xl/tables/table1.xml");
       const xml = parseXML(new XMLString((tableFile as XLSXExportXMLFile)?.content));
@@ -1518,6 +1520,13 @@ describe("Test XLSX export", () => {
       expect(tableStyle?.getAttribute("showRowStripes")).toEqual("1");
       expect(tableStyle?.getAttribute("showColumnStripes")).toEqual("1");
 
+      const worksheet = exported.files.find((file) => file.path === "xl/worksheets/sheet0.xml");
+      const sheetXML = parseXML(new XMLString((worksheet as XLSXExportXMLFile)?.content));
+      const A4 = sheetXML.querySelector("worksheet row c[r='A4']");
+      expect(A4?.getAttribute("t")).toEqual("s"); // A4 was exported as a string
+      const tableCol2 = xml.querySelector("tableColumn[id='2']");
+      expect(tableCol2?.getAttribute("totalsRowFunction")).toEqual("custom"); // Column with B4 has a custom total row function
+
       expect(tableFile).toMatchSnapshot();
     });