我有一个自定义循环，可以在Wordpress站点的网格中显示项目。我正在为这些项目创建过滤器，并且在输入搜索上陷入了困境。我的管理ajax出现400错误。php和不确定如何使其工作。有人能给我一些提示吗？这是我的代码：

PHP code for loop in functions.php

add_action(\'wp_ajax_my_action\' , \'data_fetch\');
add_action(\'wp_ajax_nopriv_my_action\',\'data_fetch\');

function data_fetch(){
$args = array(
        \'orderby\' => \'title\',
        \'order\' => \'ASC\',
        \'post_type\' => \'projects\',
        \'posts_per_page\' => -1,
        \'s\' => esc_attr( $_POST[\'keyword\'] ),
    ); 

    $the_query = new WP_Query($args); 

    if( $the_query->have_posts() ) : while ($the_query->have_posts() ) : $the_query->the_post(); 

    ?>


    <div class="projects-column">
    <div class="project-image">
    <?php $image = get_field(\'image\');
    if( !empty($image) ): ?>
    <img src="<?php echo $image[\'url\']; ?>" class="project-image-tester" alt="<?php echo $image[\'alt\']; ?>" />
    <?php endif; ?>
    <div class="project-info">
    <span class="proj-name" style="font-weight: bold;"><b><?php the_title(); ?></b></span>
    </div>


    <div class="project-onhover">
    <span class="proj-title"><p><b><?php the_title(); ?></b></p></span>
    <span class="proj-details">
    <p><span style="font-weight: bold;">LOCATION: </span><?php the_field(\'location\'); ?></p>
    <p><span style="font-weight: bold;">PROJECT VALUE: </span><?php the_field(\'project_value\'); ?></p>
    <p><span style="font-weight: bold;">SERVICES: </span> <?php echo wp_strip_all_tags( get_the_term_list( $post->ID, \'project_services\', \'\', \', \', \'\' ) ); ?> </p></span>
    </div><!--projects-on-hover-tester -->
    </div><!--project-image-->
    </div><!--projects-column -->


    <?php 
    endwhile;
    wp_reset_postdata();
    php endif;
    die();
}

JS code also in functions.php

// add the ajax fetch js
add_action( \'wp_footer\', \'ajax_fetch\' );
function ajax_fetch() {
?>
<script type="text/javascript">
function fetch(){

    jQuery.ajax({
        url: wpAjax.ajaxUrl,
        type: \'post\',
        data: { action: \'data_fetch\', keyword: jQuery(\'#keyword\').val() },
        success: function(data) {
            jQuery(\'#projects-container\').html( data );
        }
    });

}
</script>

<?php
}

我之前为另一个ajax请求对脚本进行了本地化，因此url的来源是：

wp_localize_script(\'ajax\' , \'wpAjax\',
    array(\'ajaxUrl\' => admin_url(\'admin-ajax.php\'))

add_action(\'wp_ajax_my_action\' , \'data_fetch\');
add_action(\'wp_ajax_nopriv_my_action\',\'data_fetch\');

add_action( \'wp_ajax_data_fetch\', \'data_fetch\' );
add_action( \'wp_ajax_nopriv_data_fetch\', \'data_fetch\' );