Add auto download feature (#30)

* Add new feature auto-download.

* Add auto-download in readme.

* Add new line before return

Author: hpacleb

README.md

@@ -180,6 +180,14 @@ Column::make('id')->exportFormat(NumberFormat::FORMAT_GENERAL),
 Column::make('id')->exportFormat(NumberFormat::FORMAT_TEXT),
 ```
 
+## Auto Download
+
+Option to automatically download the exported file.
+
+```php
+<livewire:export-button :table-id="$dataTable->getTableId()" filename="my-table.xlsx" auto-download="true"/>
+```
+
 ## Contributing
 
 Please see [CONTRIBUTING](https://github.com/yajra/laravel-datatables-export/blob/master/.github/CONTRIBUTING.md) for details.

src/Livewire/ExportButtonComponent.php

@@ -25,6 +25,10 @@ class ExportButtonComponent extends Component
 
     public string $sheetName = 'Sheet1';
 
+    public bool $autoDownload = false;
+
+    public bool $downloaded = false;
+
     public bool $exporting = false;
 
     public bool $exportFinished = false;
@@ -39,6 +43,7 @@ public function export(string $batchJobId): void
         $this->exportFinished = false;
         $this->exportFailed = false;
         $this->exporting = true;
+        $this->downloaded = false;
     }
 
     public function getExportBatchProperty(): ?Batch
@@ -50,14 +55,21 @@ public function getExportBatchProperty(): ?Batch
         return Bus::findBatch($this->batchJobId);
     }
 
-    public function updateExportProgress(): void
+    public function updateExportProgress(): ?StreamedResponse
     {
         $this->exportFinished = $this->exportBatch->finished();
         $this->exportFailed = $this->exportBatch->hasFailures();
 
         if ($this->exportFinished) {
             $this->exporting = false;
+            if ($this->autoDownload and ! $this->downloaded){
+                $this->downloaded = true;
+
+                return $this->downloadExport();
+            }
         }
+
+        return null;
     }
 
     public function downloadExport(): StreamedResponse

src/resources/views/export-button.blade.php

@@ -23,10 +23,14 @@ class="{{ $class }}"
         <div class="d-inline" wire:poll="updateExportProgress">Exporting...please wait.</div>
     @endif
 
-    @if($exportFinished && !$exportFailed)
+    @if($exportFinished && !$exportFailed && !$autoDownload)
         <span>Done. Download file <a href="#" class="text-primary" wire:click.prevent="downloadExport">here</a></span>
     @endif
 
+    @if($exportFinished && !$exportFailed && $autoDownload && $downloaded)
+        <span>Done. File has been downloaded.</span>
+    @endif
+
     @if($exportFailed)
         <span>Export failed, please try again later.</span>
     @endif