Obtaining the uploaded file in the Controller that was uploaded using the yii\helpers\Html::fileInput method in Yii2

I included the following code in my form:

<?php echo Html::fileInput('imageFile', '', array('id' => 'contentForm_imageFile' )) ?>

Then, I attempted to retrieve the file in the controller using this code:

$newsModel->imageFile=UploadedFile::getInstance(Yii::$app->request->post('imageFile'), 'imageFile');
    $newsModel->imageFile->saveAs( 'uploads/'.$newsModel->file->basename.'.'.$newsModel->file->extension );

However, when trying to save the file with the above code, I encountered the following error:

Call to a member function saveAs() on null

According to the API documentation of yii\web\UploadedFile:

The getInstance() method returns an uploaded file for the given model attribute, The file should be uploaded using yii\widgets\ActiveField::fileInput().

So, how can I access the uploaded file that was submitted through yii\helpers\Html::fileInput?

phpyiiyii2

Answer №1

To access an uploaded file without a model, you can utilize the getInstanceByName() method

$newsModel->imageFile = UploadedFile::getInstanceByName('imageFile');
$newsModel->imageFile->saveAs( 'uploads/'.$newsModel->file->basename.'.'.$newsModel->file->extension );

Answer №2

Take a look at this recommended example tailored to your specific issue:

It's essential that you carefully review your code:

  1. Start by ensuring that you have included enctype="multipart/form-data" in your form tag.
  2. Refer to for additional information on the getInstance method parameters, which require the model instance as the first parameter and the field name as the second.
  3. Verify that your server is successfully receiving the file you are sending by executing var_dump($_FILES);

Answer №3

To include, use 

'enctype' => 'multipart/form-data'

Within the display:

<?= $form->field($model, 'imageFile')->fileInput(['id' => 'contentForm_imageFile']) ?>

Alternatively

<?= Html::activeFileInput($model, 'imageFile', ['id' => 'contentForm_imageFile']) ?>

In the Controller:

$newsModel->imageFile = UploadedFile::getInstance($newsModel, 'imageFile');
$newsModel->imageFile->saveAs( 'uploads/'.$newsModel->file->basename.'.'.$newsModel->file->extension );

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