Passing extra data to yii uploader - ajax

Question

Am creating a file uploader using the kartik uploader bu the problem is that it doesn't pass extra data
The form(view) code
<?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]); ?>
<?= $form->field($model, 'case_description')->textArea();?>
<?php echo $form->field($evidence, 'path')->widget(FileInput::classname(), [
'options' => ['accept' => '*','multiple' => true,'name'=>'images'],
'pluginOptions' => [
'browseIcon' => '<i class="glyphicon glyphicon-camera"></i> ',
'showPreview' => true,
'showCaption' => true,
'showRemove' => true,
'showUpload' => true,
'browseLabel' => 'Insert Evidence',
'uploadUrl' => Url::to(['cases/upload']),
'maxFileCount' => 10,
'uploadExtraData' => [
'album_id' => "javascript: return $('#cases-case_description').val());",
],
],
]
);?>
The $evidence ,path is a table related to the models table
The controller that I have tested with (code)
public function actionUpload(){
$ann = empty($_POST['album_id']) ? '' : $_POST['album_id'];
var_dump($ann)
}
This returns null showing that the album_id is not passed to the controller and yet the $model->case_description is the field above the upload widget
The new controller
public function actionUpload(){
$images = $_FILES['evidence'];
$success = null;
$paths= ['uploads'];
// get file names
$filenames = $images['name'];
// loop and process files
for($i=0; $i < count($filenames); $i++){
//$ext = explode('.', basename($filenames[$i]));
$target = "uploads/cases/evidence".DIRECTORY_SEPARATOR . md5(uniqid()); //. "." . array_pop($ext);
if(move_uploaded_file($images['name'], $target)) {
$success = true;
$paths[] = $target;
} else {
$success = false;
break;
}
echo $success;
}
// check and process based on successful status
if ($success === true) {
$output = [];
} elseif ($success === false) {
$output = ['error'=>'Error while uploading images. Contact the system administrator'];
foreach ($paths as $file) {
unlink($file);
}
} else {
$output = ['error'=>'No files were processed.'];
}
// return a json encoded response for plugin to process successfully
echo json_encode($output);

Answer 1

Due the problem with dinamic/variable assign to extraData i suggest a simple solution based on POST / submit method (eventually set the proper action in your form)
use kartik\widgets\FileInput
<?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]); ?>
<?= $form->field($model, 'case_description')->textArea();?>
<?php echo $form->field($evidence, 'path')->widget(FileInput::classname(), [
'options' => ['accept' => '*','multiple' => true,'name'=>'images'],
'pluginOptions' => [
'browseIcon' => '<i class="glyphicon glyphicon-camera"></i> ',
'showPreview' => true,
'showCaption' => true,
'showRemove' => true,
'showUpload' => true,
'browseLabel' => 'Insert Evidence',
'uploadUrl' => Url::to(['cases/upload']),
'maxFileCount' => 10,
],
]
);
echo Html::submitButton($model->isNewRecord ? 'Upload' : 'Update', [
'class'=>$model->isNewRecord ? 'btn btn-success' : 'btn btn-primary']
);
ActiveForm::end();
?>