DataCommand.php

<?php

namespace Drupal\Core\Ajax;


/**
 * An AJAX command for implementing jQuery's data() method.
 *
 * This instructs the client to attach the name=value pair of data to the
 * selector via jQuery's data cache.
 *
 * This command is implemented by Drupal.AjaxCommands.prototype.data() defined
 * in misc/ajax.js.
 *
 * @ingroup ajax
 */
class DataCommand implements CommandInterface {
    
    /**
     * A CSS selector string for elements to which data will be attached.
     *
     * If the command is a response to a request from an #ajax form element then
     * this value can be NULL.
     *
     * @var string
     */
    protected $selector;
    
    /**
     * The key of the data attached to elements matched by the selector.
     *
     * @var string
     */
    protected $name;
    
    /**
     * The value of the data to be attached to elements matched by the selector.
     *
     * The data is not limited to strings; it can be any format.
     *
     * @var mixed
     */
    protected $value;
    
    /**
     * Constructs a DataCommand object.
     *
     * @param string $selector
     *   A CSS selector for the elements to which the data will be attached.
     * @param string $name
     *   The key of the data to be attached to elements matched by the selector.
     * @param mixed $value
     *   The value of the data to be attached to elements matched by the selector.
     */
    public function __construct($selector, $name, $value) {
        $this->selector = $selector;
        $this->name = $name;
        $this->value = $value;
    }
    
    /**
     * Implements Drupal\Core\Ajax\CommandInterface:render().
     */
    public function render() {
        return [
            'command' => 'data',
            'selector' => $this->selector,
            'name' => $this->name,
            'value' => $this->value,
        ];
    }

}