我在 Drupal 8 中有一个自定义表单。表单的 managed_file 字段具有多个 true。我面临着关于上传到该字段的文件数量限制的挑战。
我必须让这个 managed_file 字段只上传 3 张图片。
有人可以帮我解决这个问题吗?我试过下面的代码。
public function buildForm(array $form, FormStateInterface $form_state) {
$form['upload_doc'] = array(
'#type' => 'managed_file',
'#title' => 'File Upload',
'#upload_location' => 'public://upload_document/',
'#required' => TRUE,
'#multiple' => TRUE,
'#upload_validators' => array(
'file_validate_extensions' => array('jpg jpeg png'),
'file_validate_size' => 2000,
),
);
// Add a submit button that handles the submission of the form.
$form['actions']['submit'] = [
'#type' => 'submit',
'#value' => $this->t('Submit'),
];
return $form;
}
public function validateForm(array &$form, FormStateInterface $form_state) {
$fileObj = $form_state->getValue('upload_doc');
if (count($fileObj) > 3) {
drupal_set_message('File limit exceed'.count($fileObj), 'error');
return false;
} else {
return true;
}
}
问题是,我无法验证文件上传限制。它允许上传超过限制。请帮帮我谢谢