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Shows a way to create a Participants Database form element that displays an embedded video by using WordPress' built-in video embed filters
<?php
/**
* Plugin Name: PDB Video Form Element
* Description: Demonstrates how to create a Participants Database form element that displays a video
* Version: 3.0
* Text Domain: pdb-video-form-element
* Domain Path: /languages
*
*/
class PDb_Video_Form_Element {
/**
* @var string name of the form element
*/
private $name = 'video';
/**
*
*/
public function __construct()
{
add_filter( 'pdb-set_form_element_types', array($this, 'video_register_element') );
add_action( 'pdb-form_element_build_' . $this->name, array($this, 'video_element_building_function') );
add_filter( 'pdb-before_display_form_element', array($this, 'video_element_value_display_function'), 10, 2 );
}
/**
* adds the form element to the list of form elements
*
* @param array $elements
* @return array
*/
public function video_register_element( $elements )
{
$elements[$this->name] = __( 'Video', 'pdb-video-form-element' );
return $elements;
}
/**
* supplies the form element HTML in a write context
*
* @param PDb_FormElement $field
* @return null
*/
public function video_element_building_function( $field )
{
$field->type = 'text-line';
}
/**
* displays the video
*
* this relies on the built-in WP filter that makes an embed out of a URL
*
* @param array $value the raw value of the field
* @param PDb_Field_Item object $field
* @return string HTML
*/
public function video_element_value_display_function( $value, $field )
{
if ( $field->form_element === $this->name ) {
$oembed = new WP_oEmbed();
$value[] = '<div class="pdb-video-container ' . $field->name . '-video">';
$value[] = $oembed->get_html( $this->extract_url( $field->value ) );
$value[] = '</div>';
return implode( PHP_EOL, $value );
}
return $value;
}
/**
* extracts the URL from the content
*
* this is to clean up a messy content string so that all that remains is the URL
*
* @param string $content
* @return string the cleaned-up URL
*/
private function extract_url( $content )
{
$output = '';
foreach( explode( ' ', $content ) as $part ) {
if ( empty( $part ) ) {
continue;
}
$check = filter_var( $part, FILTER_VALIDATE_URL, FILTER_FLAG_PATH_REQUIRED );
if ( $check !== false ) {
$output = $check;
break;
}
}
return $output;
}
}
new PDb_Video_Form_Element();
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