Add Laravel Excel and FastExcel quick integration docs.

Author: yajra

buttons-fast-excel.md

@@ -0,0 +1,58 @@
+# Fast Excel Integration
+
+[Fast-Excel](https://github.com/rap2hpoutre/fast-excel) is recommended when exporting bulk records.
+
+## Usage
+
+1. Install `fast-excel` using `composer require rap2hpoutre/fast-excel`.
+2. Create a dataTable class `php artisan datatables:make Users`
+3. Adjust `UsersDataTable` as needed.
+4. Set property `$fastExcel = true`.
+
+```php
+class UsersDataTable extends DataTable
+{
+    protected $fastExcel = true;
+
+    ...
+}
+```
+
+5. DataTables will now export csv & excel using `fast-excel` package.
+
+
+## Faster export by disabling the fast-excel callback
+
+1. Just set property `$fastExcelCallback = false`. This is enabled by default for a better formatted output of exported file.
+
+```php
+class UsersDataTable extends DataTable
+{
+    protected $fastExcel = true;
+    protected $fastExcelCallback = false;
+
+```
+
+2. Exported file will now be based on how your query was structured. No header formatting and all selected columns in sql will be included in the output.
+
+## Using custom callback
+
+Just override the `fastExcelCallback` method:
+
+```php
+class UsersDataTable extends DataTable
+{
+    protected $fastExcel = true;
+
+    public function fastExcelCallback()
+    {
+        return function ($row) {
+            return [
+                'Name' => $row['name'],
+                'Email' => $row['email'],
+            ];
+        };
+    }
+
+...
+```

buttons-laravel-excel.md

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+# Laravel Excel Integration
+
+[Laravel Excel](https://github.com/Maatwebsite/Laravel-Excel) is the default package used when exporting DataTables to Excel and CSV.
+
+## Using Export Class
+
+1. Create an export class `php artisan make:export UsersExport`
+2. Update the generated export class and extend `DataTablesCollectionExport`
+
+```php
+namespace App\Exports;
+
+use Yajra\DataTables\Exports\DataTablesCollectionExport;
+
+class UsersExport extends DataTablesCollectionExport
+{
+
+}
+```
+
+3. Update your `UsersDataTable` class and set `protected $exportClass = UsersExport::class`
+
+```php
+class UsersDataTable extends DataTable
+{
+    protected $exportClass = UsersExport::class;
+
+```
+
+4. Update your export class as needed. See official package docs: https://docs.laravel-excel.com/3.1/exports/collection.html
+
+## Example Export Class
+
+```php
+namespace App\Exports;
+
+use Maatwebsite\Excel\Concerns\WithMapping;
+use Yajra\DataTables\Exports\DataTablesCollectionExport;
+
+class UsersExport extends DataTablesCollectionExport implements WithMapping
+{
+    public function headings(): array
+    {
+        return [
+            'Name',
+            'Email',
+        ];
+    }
+
+    public function map($row): array
+    {
+        return [
+            $row['name'],
+            $row['email'],
+        ];
+    }
+}
+```
+

documentation.md

@@ -103,6 +103,8 @@
 	- [Sending Parameters](/docs/{{package}}/{{version}}/buttons-with)
 	- [Extended DataTable](/docs/{{package}}/{{version}}/buttons-extended)
 	- [Buttons Command](/docs/{{package}}/{{version}}/buttons-console)
+	- [Laravel Excel Export](/docs/{{package}}/{{version}}/buttons-laravel-excel)
+	- [Fast Excel Export](/docs/{{package}}/{{version}}/buttons-fast-excel)
 	- [Github](https://github.com/yajra/laravel-datatables-buttons)
 
 - ## Editor