Drupal7 managed_file form - forms

Question

I have this managed_file form in a Drupal customized module, with this form a user can upload an image and saved it under sites/default/files.
$form['Background_image'] = array(
'#type' => 'managed_file',
'#title' => t('Image'),
'#progress_message' => t('Please wait...'),
'#progress_indicator' => 'bar',
'#description' => t('Click "Browse..." to select an image to upload.'),
'#required' => TRUE,
///'#upload_validators' => array('file_validate_extensions' => array('jpeg jpg png gif')),
'#upload_location' => 'public://backgroundimage/'
'#default_value' => $this->options['Background image'],
);
how to add a function to get the uploaded file?
I tried this but it didnt work.
$image = file_load($form_state['values']['Background_image']);

Answer 1

You should be able to just create the form element, and then use the $form_state['values'] array to get the fid. like this:
function my_module_form() {
$form = array();
$form['background_image'] = array(
'#type' => 'managed_file',
'#title' => t('Image'),
'#progress_message' => t('Please wait...'),
'#progress_indicator' => 'bar',
'#description' => t('Click "Browse..." to select an image to upload.'),
'#required' => TRUE,
'#upload_location' => 'public://backgroundimage/',
'#default_value' => $this->options['background image'] //fid
);
return $form;
}
function my_module_form_submit($form, &$form_state) {
$file = file_load($form_state['values']['background_image']);
$file->status = FILE_STATUS_PERMANENT;
file_usage_add($file, 'module_name', 'entity_name', $entity_id);
file_save($file);
}
I just wrote that on the fly so I'm sure there are syntax errors :) but that's the idea. If you are not getting the file id from $form_state['values']['background_image'], I would try dying in your submit handler and dumping the contents of $form_state['values']:
function my_module_form_submit($form, &$form_state) {
die(var_dump($form_state['values']['background_image']));
}
That should tell you a few things about whats being returned from your form.