Fix numeric format as text.

README.md

@@ -108,7 +108,7 @@ The package will auto-detect numeric fields and can be used with custom formats.
 ```php
 Column::make('total')->exportFormat('0.00'),
 Column::make('count')->exportFormat('#,##0'),
-Column::make('average')->exportFormat('#,##0.00),
+Column::make('average')->exportFormat('#,##0.00'),
 ```
 
 ## Date Fields Formatting
@@ -152,6 +152,16 @@ Valid date formats can be adjusted on `datatables-export.php` config file.
     ]
 ```
 
+## Force Numeric Field As Text Format
+
+Option to force auto-detected numeric value as text format.
+
+```php
+Column::make('id')->exportFormat('@'),
+Column::make('id')->exportFormat(NumberFormat::FORMAT_GENERAL),
+Column::make('id')->exportFormat(NumberFormat::FORMAT_TEXT),
+```
+
 ## Contributing
 
 Please see [CONTRIBUTING](https://github.com/yajra/laravel-datatables-export/blob/master/.github/CONTRIBUTING.md) for details.

src/Jobs/DataTableExportJob.php

@@ -2,10 +2,6 @@
 
 namespace Yajra\DataTables\Jobs;
 
-use OpenSpout\Common\Helper\CellTypeHelper;
-use OpenSpout\Common\Type;
-use OpenSpout\Writer\Common\Creator\Style\StyleBuilder;
-use OpenSpout\Writer\Common\Creator\WriterEntityFactory;
 use Carbon\Carbon;
 use Illuminate\Bus\Batchable;
 use Illuminate\Bus\Queueable;
@@ -16,11 +12,13 @@
 use Illuminate\Queue\SerializesModels;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Facades\Auth;
-use Illuminate\Support\Facades\File;
 use Illuminate\Support\Facades\Storage;
 use Illuminate\Support\Str;
+use OpenSpout\Common\Helper\CellTypeHelper;
+use OpenSpout\Common\Type;
+use OpenSpout\Writer\Common\Creator\Style\StyleBuilder;
+use OpenSpout\Writer\Common\Creator\WriterEntityFactory;
 use PhpOffice\PhpSpreadsheet\Shared\Date;
-use Yajra\DataTables\Exceptions\Exception;
 use Yajra\DataTables\Html\Column;
 use Yajra\DataTables\Services\DataTable;
 
@@ -113,13 +111,20 @@ public function handle()
                         WriterEntityFactory::createCell($date, (new StyleBuilder)->setFormat($format)->build())
                     );
                 } else {
-                    $format = $column['exportFormat']
-                        ? (new StyleBuilder)->setFormat($column['exportFormat'])->build()
-                        : null;
-
-                    $value = $this->isNumeric($value) ? (float) $value : $value;
-
-                    $cells->push(WriterEntityFactory::createCell($value, $format));
+                    if ($this->wantsText($column)) {
+                        $cells->push(
+                            WriterEntityFactory::createCell($value,
+                                (new StyleBuilder)->setFormat($column['exportFormat'])->build())
+                        );
+                    } else {
+                        $format = $column['exportFormat']
+                            ? (new StyleBuilder)->setFormat($column['exportFormat'])->build()
+                            : null;
+
+                        $value = $this->isNumeric($value) ? (float) $value : $value;
+
+                        $cells->push(WriterEntityFactory::createCell($value, $format));
+                    }
                 }
             });
 
@@ -154,4 +159,17 @@ protected function isNumeric($value): bool
 
         return is_numeric($value);
     }
+
+    /**
+     * @param  \Yajra\DataTables\Html\Column  $column
+     * @return bool
+     */
+    protected function wantsText(Column $column): bool
+    {
+        if (! isset($column['exportFormat'])) {
+            return false;
+        }
+
+        return in_array($column['exportFormat'], config('datatables-export.text_formats', ['@']));
+    }
 }

src/config/datatables-export.php

@@ -81,6 +81,20 @@
         NumberFormat::FORMAT_DATE_YYYYMMDDSLASH,
     ],
 
+    /*
+    |--------------------------------------------------------------------------
+    | Valid Text Formats
+    |--------------------------------------------------------------------------
+    |
+    | List of valid text formats to be used.
+    |
+    */
+    'text_formats' => [
+        '@',
+        NumberFormat::FORMAT_GENERAL,
+        NumberFormat::FORMAT_TEXT
+    ],
+
     /*
     |--------------------------------------------------------------------------
     | Purge Options