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function is not described

WP_Customize_Control::render_content() protected WP 3.4.0

Render the control's content.

Allows the content to be overridden without having to rewrite the wrapper in $this::render().

Supports basic input types text, checkbox, textarea, radio, select and dropdown-pages. Additional input types such as email, url, number, hidden and date are supported implicitly.

Control content can alternately be rendered in JS. See WP_Customize_Control::print_template().

{} It's a method of the class: WP_Customize_Control{}

No Hooks.

Return

Null. Nothing.

Usage

// protected - for code of main (parent) or child class
$result = $this->render_content();

Changelog

Since 3.4.0 Introduced.

Code of WP_Customize_Control::render_content() WP 5.5.1

<?php
protected function render_content() {
	$input_id         = '_customize-input-' . $this->id;
	$description_id   = '_customize-description-' . $this->id;
	$describedby_attr = ( ! empty( $this->description ) ) ? ' aria-describedby="' . esc_attr( $description_id ) . '" ' : '';
	switch ( $this->type ) {
		case 'checkbox':
			?>
			<span class="customize-inside-control-row">
				<input
					id="<?php echo esc_attr( $input_id ); ?>"
					<?php echo $describedby_attr; ?>
					type="checkbox"
					value="<?php echo esc_attr( $this->value() ); ?>"
					<?php $this->link(); ?>
					<?php checked( $this->value() ); ?>
				/>
				<label for="<?php echo esc_attr( $input_id ); ?>"><?php echo esc_html( $this->label ); ?></label>
				<?php if ( ! empty( $this->description ) ) : ?>
					<span id="<?php echo esc_attr( $description_id ); ?>" class="description customize-control-description"><?php echo $this->description; ?></span>
				<?php endif; ?>
			</span>
			<?php
			break;
		case 'radio':
			if ( empty( $this->choices ) ) {
				return;
			}

			$name = '_customize-radio-' . $this->id;
			?>
			<?php if ( ! empty( $this->label ) ) : ?>
				<span class="customize-control-title"><?php echo esc_html( $this->label ); ?></span>
			<?php endif; ?>
			<?php if ( ! empty( $this->description ) ) : ?>
				<span id="<?php echo esc_attr( $description_id ); ?>" class="description customize-control-description"><?php echo $this->description; ?></span>
			<?php endif; ?>

			<?php foreach ( $this->choices as $value => $label ) : ?>
				<span class="customize-inside-control-row">
					<input
						id="<?php echo esc_attr( $input_id . '-radio-' . $value ); ?>"
						type="radio"
						<?php echo $describedby_attr; ?>
						value="<?php echo esc_attr( $value ); ?>"
						name="<?php echo esc_attr( $name ); ?>"
						<?php $this->link(); ?>
						<?php checked( $this->value(), $value ); ?>
						/>
					<label for="<?php echo esc_attr( $input_id . '-radio-' . $value ); ?>"><?php echo esc_html( $label ); ?></label>
				</span>
			<?php endforeach; ?>
			<?php
			break;
		case 'select':
			if ( empty( $this->choices ) ) {
				return;
			}

			?>
			<?php if ( ! empty( $this->label ) ) : ?>
				<label for="<?php echo esc_attr( $input_id ); ?>" class="customize-control-title"><?php echo esc_html( $this->label ); ?></label>
			<?php endif; ?>
			<?php if ( ! empty( $this->description ) ) : ?>
				<span id="<?php echo esc_attr( $description_id ); ?>" class="description customize-control-description"><?php echo $this->description; ?></span>
			<?php endif; ?>

			<select id="<?php echo esc_attr( $input_id ); ?>" <?php echo $describedby_attr; ?> <?php $this->link(); ?>>
				<?php
				foreach ( $this->choices as $value => $label ) {
					echo '<option value="' . esc_attr( $value ) . '"' . selected( $this->value(), $value, false ) . '>' . $label . '</option>';
				}
				?>
			</select>
			<?php
			break;
		case 'textarea':
			?>
			<?php if ( ! empty( $this->label ) ) : ?>
				<label for="<?php echo esc_attr( $input_id ); ?>" class="customize-control-title"><?php echo esc_html( $this->label ); ?></label>
			<?php endif; ?>
			<?php if ( ! empty( $this->description ) ) : ?>
				<span id="<?php echo esc_attr( $description_id ); ?>" class="description customize-control-description"><?php echo $this->description; ?></span>
			<?php endif; ?>
			<textarea
				id="<?php echo esc_attr( $input_id ); ?>"
				rows="5"
				<?php echo $describedby_attr; ?>
				<?php $this->input_attrs(); ?>
				<?php $this->link(); ?>
			><?php echo esc_textarea( $this->value() ); ?></textarea>
			<?php
			break;
		case 'dropdown-pages':
			?>
			<?php if ( ! empty( $this->label ) ) : ?>
				<label for="<?php echo esc_attr( $input_id ); ?>" class="customize-control-title"><?php echo esc_html( $this->label ); ?></label>
			<?php endif; ?>
			<?php if ( ! empty( $this->description ) ) : ?>
				<span id="<?php echo esc_attr( $description_id ); ?>" class="description customize-control-description"><?php echo $this->description; ?></span>
			<?php endif; ?>

			<?php
			$dropdown_name     = '_customize-dropdown-pages-' . $this->id;
			$show_option_none  = __( '&mdash; Select &mdash;' );
			$option_none_value = '0';
			$dropdown          = wp_dropdown_pages(
				array(
					'name'              => $dropdown_name,
					'echo'              => 0,
					'show_option_none'  => $show_option_none,
					'option_none_value' => $option_none_value,
					'selected'          => $this->value(),
				)
			);
			if ( empty( $dropdown ) ) {
				$dropdown  = sprintf( '<select id="%1$s" name="%1$s">', esc_attr( $dropdown_name ) );
				$dropdown .= sprintf( '<option value="%1$s">%2$s</option>', esc_attr( $option_none_value ), esc_html( $show_option_none ) );
				$dropdown .= '</select>';
			}

			// Hackily add in the data link parameter.
			$dropdown = str_replace( '<select', '<select ' . $this->get_link() . ' id="' . esc_attr( $input_id ) . '" ' . $describedby_attr, $dropdown );

			// Even more hacikly add auto-draft page stubs.
			// @todo Eventually this should be removed in favor of the pages being injected into the underlying get_pages() call. See <https://github.com/xwp/wp-customize-posts/pull/250>.
			$nav_menus_created_posts_setting = $this->manager->get_setting( 'nav_menus_created_posts' );
			if ( $nav_menus_created_posts_setting && current_user_can( 'publish_pages' ) ) {
				$auto_draft_page_options = '';
				foreach ( $nav_menus_created_posts_setting->value() as $auto_draft_page_id ) {
					$post = get_post( $auto_draft_page_id );
					if ( $post && 'page' === $post->post_type ) {
						$auto_draft_page_options .= sprintf( '<option value="%1$s">%2$s</option>', esc_attr( $post->ID ), esc_html( $post->post_title ) );
					}
				}
				if ( $auto_draft_page_options ) {
					$dropdown = str_replace( '</select>', $auto_draft_page_options . '</select>', $dropdown );
				}
			}

			echo $dropdown;
			?>
			<?php if ( $this->allow_addition && current_user_can( 'publish_pages' ) && current_user_can( 'edit_theme_options' ) ) : // Currently tied to menus functionality. ?>
				<button type="button" class="button-link add-new-toggle">
					<?php
					/* translators: %s: Add New Page label. */
					printf( __( '+ %s' ), get_post_type_object( 'page' )->labels->add_new_item );
					?>
				</button>
				<div class="new-content-item">
					<label for="create-input-<?php echo $this->id; ?>"><span class="screen-reader-text"><?php _e( 'New page title' ); ?></span></label>
					<input type="text" id="create-input-<?php echo $this->id; ?>" class="create-item-input" placeholder="<?php esc_attr_e( 'New page title&hellip;' ); ?>">
					<button type="button" class="button add-content"><?php _e( 'Add' ); ?></button>
				</div>
			<?php endif; ?>
			<?php
			break;
		default:
			?>
			<?php if ( ! empty( $this->label ) ) : ?>
				<label for="<?php echo esc_attr( $input_id ); ?>" class="customize-control-title"><?php echo esc_html( $this->label ); ?></label>
			<?php endif; ?>
			<?php if ( ! empty( $this->description ) ) : ?>
				<span id="<?php echo esc_attr( $description_id ); ?>" class="description customize-control-description"><?php echo $this->description; ?></span>
			<?php endif; ?>
			<input
				id="<?php echo esc_attr( $input_id ); ?>"
				type="<?php echo esc_attr( $this->type ); ?>"
				<?php echo $describedby_attr; ?>
				<?php $this->input_attrs(); ?>
				<?php if ( ! isset( $this->input_attrs['value'] ) ) : ?>
					value="<?php echo esc_attr( $this->value() ); ?>"
				<?php endif; ?>
				<?php $this->link(); ?>
				/>
			<?php
			break;
	}
}