Fix formulas in cells:

protobi#11

Author: Mark Poepping

bits/67_wsxml.js

@@ -143,8 +143,10 @@ function write_ws_xml_cols(ws, cols) {
   return o.join("");
 }
 
+// Fixes from https://github.com/protobi/js-xlsx/pull/11
 function write_ws_xml_cell(cell, ref, ws, opts, idx, wb) {
-  if (cell.v === undefined && cell.s === undefined) return "";
+  //if (cell.v === undefined && cell.s === undefined) return "";
+  if ( ! (cell.v || cell.s ||  cell.f ) ) return "";
   var vv = "";
   var oldt = cell.t, oldv = cell.v;
   switch (cell.t) {
@@ -169,7 +171,10 @@ function write_ws_xml_cell(cell, ref, ws, opts, idx, wb) {
       vv = cell.v;
       break;
   }
-  var v = writetag('v', escapexml(vv)), o = {r: ref};
+  //  var v = writetag('v', escapexml(vv)), o = {r: ref};
+  var o = { r: ref };
+  var v = cell.f ? writetag('f', escapexml(cell.f)) : writetag('v', escapexml(vv));
+
   /* TODO: cell style */
   var os = get_cell_style(opts.cellXfs, cell, opts);
   if (os !== 0) o.s = os;

dist/xlsx.js

@@ -7681,8 +7681,10 @@ function write_ws_xml_cols(ws, cols) {
   return o.join("");
 }
 
+// Fixes from https://github.com/protobi/js-xlsx/pull/11
 function write_ws_xml_cell(cell, ref, ws, opts, idx, wb) {
-  if (cell.v === undefined && cell.s === undefined) return "";
+  //if (cell.v === undefined && cell.s === undefined) return "";
+  if ( ! (cell.v || cell.s ||  cell.f ) ) return "";
   var vv = "";
   var oldt = cell.t, oldv = cell.v;
   switch (cell.t) {
@@ -7707,7 +7709,10 @@ function write_ws_xml_cell(cell, ref, ws, opts, idx, wb) {
       vv = cell.v;
       break;
   }
-  var v = writetag('v', escapexml(vv)), o = {r: ref};
+  //  var v = writetag('v', escapexml(vv)), o = {r: ref};
+  var o = { r: ref };
+  var v = cell.f ? writetag('f', escapexml(cell.f)) : writetag('v', escapexml(vv));
+
   /* TODO: cell style */
   var os = get_cell_style(opts.cellXfs, cell, opts);
   if (os !== 0) o.s = os;

xlsx.js

@@ -7681,8 +7681,10 @@ function write_ws_xml_cols(ws, cols) {
   return o.join("");
 }
 
+// Fixes from https://github.com/protobi/js-xlsx/pull/11
 function write_ws_xml_cell(cell, ref, ws, opts, idx, wb) {
-  if (cell.v === undefined && cell.s === undefined) return "";
+  //if (cell.v === undefined && cell.s === undefined) return "";
+  if ( ! (cell.v || cell.s ||  cell.f ) ) return "";
   var vv = "";
   var oldt = cell.t, oldv = cell.v;
   switch (cell.t) {
@@ -7707,7 +7709,10 @@ function write_ws_xml_cell(cell, ref, ws, opts, idx, wb) {
       vv = cell.v;
       break;
   }
-  var v = writetag('v', escapexml(vv)), o = {r: ref};
+  //  var v = writetag('v', escapexml(vv)), o = {r: ref};
+  var o = { r: ref };
+  var v = cell.f ? writetag('f', escapexml(cell.f)) : writetag('v', escapexml(vv));
+
   /* TODO: cell style */
   var os = get_cell_style(opts.cellXfs, cell, opts);
   if (os !== 0) o.s = os;