Let's add the upload functionality to our registration form. We'll add a file-upload dialog, asking the user to upload his image.
Let's start with editing our model
User.php. Add a public attribute named$image.public $image; public static function model($className=__CLASS__) { return parent::model($className); }Now add some validation rules for this attribute.
return array( array('image', 'file', 'allowEmpty' => true, 'types' => 'jpg, jpeg, gif, png' ), ... );Add the attribute's name to this attribute:
'image'=>'Upload Photo',
Edit
_form.phpunderprotected/views/userto add the following lines to enable this form to accept file uploads:'htmlOptions' => array('enctype' => 'multipart/form-data'), <code in uploads/_form.php>Finally, add the following lines to the
UserController.phpaction created, to save the uploaded file:if(isset($_POST['User'])) { $model->attributes=$_POST['User']; $model->image=CUploadedFile::getInstance($model,'image'); if($model->save()) { $path=Yii::getPathOfAlias( 'webroot.images.'.$model->first_name ); $model->image->saveAs($path); $this->redirect(array('view','id'=>$model->id)); } }
That's it, we are done. Now try to fill the form, select the file to be uploaded and you can find the uploaded file at the web_root/images folder.
At the start, we set a public attribute to our User model to hold the file data. Next we set some validation rules to specify that the file upload is not compulsory and the user can upload only .jpg, .gif, and .png files.
Then we set our form to accept file uploads. As we are uploading the binary data in the form of a file, we need to enable our form to accept binary data. We did this with 'enctype' => 'multipart/form-data'. Additionally, the form method must be set to POST.
At this stage we are done with the upload part, but at the server side we need some logic to process the uploaded contents. We added this functionality with the following line:
$model->image=CUploadedFile::getInstance($model,'image');
To get the uploaded contents in $model->image, we add the following line:
$model->image->saveAs($path.$model->first_name);
We have saved and received data in a file with the same name as the user's first name. Alternatively, you can get the original filename with $model->image->getName().
We have used two components provided by Yii. Following are the two components:
CUploadedFile: This represents the information for an uploaded file. It's a wrapper class for the$_FILEarray that PHP uses to hold uploaded files. We have used itsgetInstance()method to get the uploaded file and then usedsaveAs()to save the data to the file. Additionally, we can get other information about the file, including the name, temporary name, type, size, and errors. Get more details on the website http://www.yiiframework.com/doc/api/1.1/CUploadedFile.CFileValidator: This verifies if an attribute is receiving a valid uploaded file. With the file validator, we can make thefilefield compulsory, specify the maximum number of files, and specify the minimum and maximum limits on the file size and a file type. We can also set the details of the errors to be displayed. By adding the following lines in therulesarray of the model, we can enable thefilefield validation:return array( array('image', 'file', 'allowEmpty' => true, 'types' => 'jpg, jpeg, gif, png' ), ... );
With these lines, we have set the image attribute to be optional and we have restricted the file types to image files.
You can get more details from the website http://www.yiiframework.com/doc/api/1.1/CFileValidator/.