create response row returns a promise

frontend-js/src/main/js/gui/export/AbstractExportPanel.js

@@ -585,7 +585,7 @@ AbstractExportPanel.prototype.createResponseHeader = function (columns, miriamTy
     var miriamType = miriamTypes[i];
     stringBuilder.push(miriamType.getCommonName());
   }
-  return stringBuilder.join("\t");
+  return Promise.resolve(stringBuilder.join("\t"));
 
 };
 

frontend-js/src/main/js/gui/export/NetworkExportPanel.js

@@ -237,11 +237,13 @@ NetworkExportPanel.prototype.createResponseString = function () {
       return Promise.reject(new GuiMessageError("You must select at least one column"));
     }
 
-    var rows = [];
-    rows.push(self.createResponseHeader(selectedColumns, miriamTypes));
+    var rowPromises = [];
+    rowPromises.push(self.createResponseHeader(selectedColumns, miriamTypes));
     for (var i = 0; i < reactions.length; i++) {
-      rows.push(self.createResponseRow(reactions[i], selectedColumns, miriamTypes, elementIds));
+      rowPromises.push(self.createResponseRow(reactions[i], selectedColumns, miriamTypes, elementIds));
     }
+    return Promise.all(rowPromises);
+  }).then(function (rows) {
     return rows.join("\n");
   });
 };
@@ -252,7 +254,7 @@ NetworkExportPanel.prototype.createResponseString = function () {
  * @param {Object} columns
  * @param {MiriamType[]} miriamTypes
  * @param {Object<string,boolean>} elementIds
- * @returns {string}
+ * @returns {Promise<string>}
  */
 NetworkExportPanel.prototype.createResponseRow = function (reaction, columns, miriamTypes, elementIds) {
   var stringBuilder = [];
@@ -280,7 +282,7 @@ NetworkExportPanel.prototype.createResponseRow = function (reaction, columns, mi
     }
     stringBuilder.push(value);
   }
-  return stringBuilder.join("\t");
+  return Promise.resolve(stringBuilder.join("\t"));
 };
 
 module.exports = NetworkExportPanel;