promise 처리 완료.

packages/common/business_components/src/ui/excel_download/index.tsx

@@ -14,32 +14,39 @@ export const downloadExcel = ({ data, fileName = new Date().getTime().toString()
   //XLSX.write(workbook, { bookType: "xlsx", type: "binary" });
   XLSX.writeFile(workbook, fileName + '.xlsx');
 };
-export const filePicked=(oFile: File, headerNum:number=0) =>{
+export const filePicked=(oFile: File, headerNum:number=0):Promise<JSON | undefined> =>{
   // Create A File Reader HTML5
   const reader = new FileReader();
-
-  // Ready The Event For When A File Gets Selected
-  reader.onload = function (e) {
-    const data = e.target?.result;
-    if (!data) {
-      console.error("Failed to read file: e.target.result is null");
-      return;
-    }
-    const wb = XLSX.read(data, { type: 'binary' });
-    // Loop Over Each Sheet
-    wb.SheetNames.forEach(function (sheetName) {
-      // Obtain The Current Row As CSV
-      const sheet = wb.Sheets[sheetName];
-      if (sheet) {
-        const jsonXls = XLSX.utils.sheet_to_json(sheet, {range:headerNum});
-        return jsonXls;
-      } else {
-        console.error(`Sheet "${sheetName}" is undefined.`);
+  return new Promise<JSON | undefined>((resolve, reject) => {
+    // Ready The Event For When A File Gets Selected
+    reader.onload = function (e) {
+      const data = e.target?.result;
+      if (!data) {
+        console.error("Failed to read file: e.target.result is null");
+        resolve(undefined);
+        return;
       }
-      return null;
-    });
-  };
+      const wb = XLSX.read(data, { type: 'binary' });
+      let jsonXls: JSON | undefined;
+      // Loop Over Each Sheet
+      wb.SheetNames.forEach(function (sheetName) {
+        // Obtain The Current Row As CSV
+        const sheet = wb.Sheets[sheetName];
+        if (sheet) {
+          jsonXls = XLSX.utils.sheet_to_json(sheet, { range: headerNum }) as unknown as JSON;
+        } else {
+          console.error(`Sheet "${sheetName}" is undefined.`);
+        }
+      });
+      resolve(jsonXls);
+    };
 
-  // Tell JS To Start Reading The File.. You could delay this if desired
-  reader.readAsBinaryString(oFile);
+    reader.onerror = function () {
+      console.error("Error reading file");
+      reject(undefined);
+    };
+
+    // Tell JS To Start Reading The File.. You could delay this if desired
+    reader.readAsBinaryString(oFile);
+  });
 }