Submit configuration form in block
Add the following method to the HelloBlock class. In this example, it's located in the src/Plugin/Block/HelloBlock.php file, but as you start thinking in a more OOP-oriented way, where it's physically located in the file structure is less important than the namespace. If you're a savvy OO programmer, you'll keep both closely aligned. But just in case, the namespace—very similar to the module's folder name and machine name from our earlier discussion—will be important later when you want to interact with your module’s code programmatically.
/**
* {@inheritdoc}
*/
public function blockSubmit($form, FormStateInterface $form_state) {
$this->configuration['hello_block_name'] = $form_state->getValue('hello_block_name');
}
If you have a fieldset wrapper around the form elements, you should pass an array to the getValue() function instead of just the field name. Here, myfieldset is the fieldset that wraps the hello_block_name field.
$this->configuration['hello_block_name'] = $form_state->getValue(['myfieldset', 'hello_block_name']);
Adding this code means the form will be processed and the form input will be saved to the configuration for this specific block instance, independently of other block instances. However, the block still doesn’t use the updated configuration result. That’s on the next page of the book.
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