yii2 Dimensions to be validated and display the error message in the form - error-handling

Question

In yii2 project I have my own file structure setup. Anything uploaded will get saved as a file type. I can get the file dimensions using the file uploaded in the temp folder by yii2. Using those dimensions I set my own width and height and compare them. If the height and width is more than what I have declared It has display an error message in the form. Which I am unable to do it.
My Active Form
<div class="company-form">
<?php
$form = ActiveForm::begin([
'action'=>['company/logo', 'id'=>$model->company_id],
'validateOnSubmit' => true,
'options' =>
['enctype' => 'multipart/form-data','class' => 'disable-submit-buttons','id'=> 'companyLogoForm'],
'fieldConfig' => [
'template' => "<div class=\"row\">
<div class=\"col-xs-6 margin-top-8\">{label}</div>\n<div class=\"col-xs-6 text-right\">{hint}</div>
\n<div class=\"col-xs-12 \">{input}</div>
</div>",
],
]); ?>
<?= $form->errorSummary($model, $options = ['header'=>'','class'=>'pull-left']); ?>
<?= $form->field($model, 'company_name')->hiddenInput(['maxlength' => true])->label(false) ?>
<?= $form->field($file, 'file')->fileInput([])->label(Yii::t('app', 'Attach Logo'),['class'=> 'margin-top-8']) ?>
<div class="form-group">
<?= Html::submitButton($model->isNewRecord ? Yii::t('app', 'Save') : Yii::t('app', 'Save'), ['class' => $model->isNewRecord ? 'btn btn-success' : 'btn btn-primary','data' => ['disabled-text' => 'Please Wait']]) ?>
</div>
<?php ActiveForm::end(); ?>
</div>
My Controller Action
public function actionLogo($id)
{
$model = $this->findModel($id);
if ($model->load(Yii::$app->request->post()) && $model->validate()) {
$file = new File;
$file->load(Yii::$app->request->post());
$a = UploadedFile::getInstance($file,'file');
$size = getimagesize($a->tempName);
$maxWidth = 500;
$maxHeight = 500;
if ($size[0] > $maxWidth || $size[1] > $maxHeight)
{
$model->addError('file', $error = 'Error Message');
if($model->hasErrors()){
return ActiveForm::validate($model);
}
}
$file->file = UploadedFile::getInstance($file,'file');
$file->file_name = $file->file->name;
$file->file_user = Yii::$app->user->id;
$file->file_type = 1;
if($file->save()){
$file->file_path = Files::getFilePath($file->file_id);
$validDir = $file->file->createFileDir($file->file_path, $file->file_id);
if($validDir){
$file->file->saveAs($file->file_path, false);
if($file->save()){
$model->company_file = $file->file_id;
$model->save();
return $this->redirect(['index']);
}
}
}
}
}
How do I add error message in the controller and pass that to display on my form on the modal box.
Note: my form is displayed on the modal box.
Thank you!!

Answer 1

You should handle the file processing in your model - or even better, create a specific UploadForm model for this purpose.
In that case you can use File Validation or a custom validator to set errors during model validation.
The built-in yii\validators\FileValidator gives you plenty pf validation rules out of the box.
This is actually pretty well explained in the documentation: Uploading Files
See also the documentation for FileValidator
Example for validating an uploaded image file:
namespace app\models;
use yii\base\Model;
use yii\web\UploadedFile;
class UploadForm extends Model
{
/**
* #var UploadedFile
*/
public $imageFile;
public function rules()
{
return [
[['imageFile'], 'file', 'skipOnEmpty' => false, 'extensions' => 'png, jpg'],
];
}
public function upload()
{
if ($this->validate()) {
$this->imageFile->saveAs('uploads/' . $this->imageFile->baseName . '.' . $this->imageFile->extension);
return true;
} else {
return false;
}
}
}

Answer 2

Try this validation rule
['imageFile', 'image', 'minWidth' => 250, 'maxWidth' => 250,'minHeight' => 250, 'maxHeight' => 250, 'extensions' => 'jpg, gif, png', 'maxSize' => 1024 * 1024 * 2],