刷新时使AJAX分页与（AJAX）URL过滤器参数一起使用

我有一个定义明确的AJAX过滤器，分为两部分，一部分用于加载更多按钮，另一部分用于选择下拉过滤器。两者都在AJAX中重新加载前端的属性列表，并且一起工作（例如，如果我选择“最低价格”，“最高价格”和“下拉列表中的床位数”，则列表将刷新，并且“加载更多”按钮将正常工作） 。

相同的过滤器也可用于URL参数。因此，例如，如果URL为：

mydomain.com/?min_price=100000&max_price=5000000&beds=3&page=3

它将按那些参数进行过滤。它甚至可以显示3页的属性。这非常好，包括初始负载。但是，如果直接加载URL，则它不适用于分页。如果我直接在浏览器中输入上述URL并加载，初始结果是正确的，但是在单击“加载更多”按钮时，它会将page = 3更改为page = 4（正确），但是它附加了未过滤完成的属性的第二页，并继续这样做-而不是进行过滤分页。

我究竟做错了什么？

这是我的代码（很抱歉！）

JS：

jQuery(function($){


 // AJAX Stuff for filters + load more button

/*
 * Load More
 */
$('#prop_loadmore').click(function(){

    $.ajax({
        url : prop_loadmore_params.ajaxurl, 
        data : {
            'action': 'loadmorebutton',
            'query': prop_loadmore_params.posts, // loop parameters passed by wp_localize_script()
            'page' : prop_loadmore_params.current_page, // Get the current page

        },
        type : 'POST',
        beforeSend : function ( xhr ) {
            $('#prop_loadmore').text( 'Loading...' ); 
            $('#prop_loadmore').addClass( 'loading' );

        },
        success : function( posts ){
            if( posts ) {
                $('#prop_loadmore').removeClass( 'loading' );
                $('#prop_loadmore').text( 'More Listings' );
                $('#main_posts').append( posts ); 
            //    $(".price-txt").digits(); // Add the commas!
                localStorage.setItem("posts", posts);
                prop_loadmore_params.current_page++; // Increase current page by 1

                var params = new URLSearchParams(location.search);
                params.set('page', prop_loadmore_params.current_page);
                window.history.replaceState({}, "", decodeURIComponent(`${location.pathname}?${params}`));


                if ( prop_loadmore_params.current_page == prop_loadmore_params.max_page ) 
                    $('#prop_loadmore').hide(); // if last page, hide loadmore

            } else {
                $('#prop_loadmore').hide(); // if no properties, hide loadmore
            }
        }
    });
    return false;
});

/*
 * Filter
 */
$('#filter').change(function(){

    $.ajaxSetup({cache: false});

    $.ajax({
        url : prop_loadmore_params.ajaxurl,
        data : $('#filter').serialize(), 
        dataType : 'json',

        success : function( data ){

            // reset current page to 1 when filters on
            prop_loadmore_params.current_page = 1;

            prop_loadmore_params.posts = data.posts;

            // set max page
            prop_loadmore_params.max_page = data.max_page;

            found_posts = data.found_posts 

            //First pull out the empty strings

            var formData = $('#filter').serializeArray().filter(function (i) {
                if(i.value != 'prop_filters') {
                    return i.value;
                }
            });

            //Now push formData to URL
            window.history.pushState('', 'title', '?' + $.param(formData) + '&page=' + prop_loadmore_params.current_page);

            $('#main_posts').html(data.content);
            $('.listings-count').text( found_posts + ' Real Estate Listings for Sale' );


            if (found_posts > 9) {
                $('#prop_loadmore').show();
            }
             if ( prop_loadmore_params.current_page == prop_loadmore_params.max_page ) 
                    $('#prop_loadmore').hide(); // if last page, hide loadmore




            // If not enough posts for 2nd page, hide loadmore
            if ( data.max_page < 2 ) {
                $('#prop_loadmore').hide();
            } else {
                $('#prop_loadmore').show();
            }
        }
    });

    return false;

});

});

Functions.php：

add_action( 'wp_enqueue_scripts', 'properties_script_and_styles');

function properties_script_and_styles() {
global $wp_query;

wp_register_script( 'property_scripts', get_stylesheet_directory_uri() . '/assets/js/properties.js', array('jquery') );


$the_page = $wp_query->query_vars['paged'] ? $wp_query->query_vars['paged'] : 1;

if (!empty($_GET['page'])) {
    $the_page = $_GET['page'];
}

wp_localize_script( 'property_scripts', 'prop_loadmore_params', array(
    'ajaxurl' => site_url() . '/wp-admin/admin-ajax.php', 
    'posts' => $wp_query->query_vars,
    'current_page' => $the_page,
    'max_page' => $wp_query->max_num_pages,
    'found_posts' => $wp_query->found_posts,

) );

wp_enqueue_script( 'property_scripts' );
}

add_action('wp_ajax_loadmorebutton', 'prop_loadmore_ajax_handler');
add_action('wp_ajax_nopriv_loadmorebutton', 'prop_loadmore_ajax_handler');

function prop_loadmore_ajax_handler(){

$args = json_decode(  $_POST['query'] ); 
$args['paged'] = $_POST['page'] + 1; 
 if (!is_user_logged_in()) {
    $args['post_status'] = 'publish';
}
else {
    $args['post_status'] = array('publish', 'private');
}
query_posts( $args );

if( have_posts() ) :


    while( have_posts() ): the_post();

        get_template_part( 'template-parts/post/content', get_post_format() );

    endwhile;
endif;
die;
}


function prepare_property_filters(array $args): array {

/** Price Args**/

if (!empty($_REQUEST['price_min']) || !empty($_REQUEST['price_max'])) 
{
    $args['meta_query'] = ['relation'=>'AND'];
}

// If Both
if( !empty( $_REQUEST['price_min'] ) && !empty( $_REQUEST['price_max'] )) {
    $args['meta_query'][] = array(
        'key' => 'price',
        'value' => array( $_REQUEST['price_min'], 
$_REQUEST['price_max'] ),
        'type' => 'numeric',
        'compare' => 'between'
    );
} else {
    // if only min price
    if( !empty( $_REQUEST['price_min'] ) ) {
        $args['meta_query'][] = array(
            'key' => 'price',
            'value' => $_REQUEST['price_min'],
            'type' => 'numeric',
            'compare' => '>'
        );
    }
}

    // if only max price
    if( !empty( $_REQUEST['price_max'] ) ) {
        $args['meta_query'][] = array(
            'key' => 'price',
            'value' => $_REQUEST['price_max'],
            'type' => 'numeric',
            'compare' => '<'
        );
    }

//* 
// Bedrooms Arg
//*
    if( !empty( $_REQUEST['beds'] ) ) {
        $args['meta_query'][] = array(
            'key' => 'bedrooms',
            'value' => $_REQUEST['beds'],
            'type' => 'numeric',
            'compare' => '>='
        );
    }

//* 
// Property Type Arg
//*
    if( !empty( $_REQUEST['type'] ) ) {
        $args['meta_query'][] = array(
            'key' => 'property_type',
            'value' => $_REQUEST['type'],
            'compare' => 'IN'
        );
    }

return $args;
}


add_action('wp_ajax_prop_filters', 'property_filters'); 
add_action('wp_ajax_nopriv_prop_filters', 'property_filters');

function property_filters() {
//*
// Sort by Args
//*

    if( $_REQUEST['sort_by'] === 'price-desc' ) {
        $orderby = 'meta_value_num'; 
        $order = 'DESC';
        $meta_key = 'price';
    }

    elseif( $_REQUEST['sort_by'] === 'price-asc' ) {
        $orderby = 'meta_value_num'; 
        $order = 'ASC';
        $meta_key = 'price';
    }
    elseif( $_REQUEST['sort_by'] === 'bedrooms-desc' ) {
        $orderby = 'meta_value_num'; 
        $order = 'DESC';
        $meta_key = 'bedrooms';
    }
    elseif( $_REQUEST["sort_by"] === 'bedrooms-asc' ) {
        $orderby = 'meta_value_num'; 
        $order = 'ASC';
        $meta_key = 'bedrooms';
    }
    else {
        $orderby = 'date'; 
        $order = 'DESC';
        $meta_key = '';
    }
$args = prepare_property_filters([
    'posts_per_page' => 9, 
    'post_status' => is_user_logged_in() ? ['publish', 'private'] : ['publish'],
    'paged' => $_POST['page'],
    'meta_key' => $meta_key,
    'orderby' => $orderby,
    'order' => $order
]);
query_posts( $args );

    global $wp_query;

    if( have_posts() ) :

        ob_start();

        while( have_posts() ): the_post();

            get_template_part( 'template-parts/post/content', get_post_format() );

        endwhile;

        $posts_html = ob_get_contents(); 
        ob_end_clean(); 
    else:
        $posts_html = '<p>Nothing found for your criteria.</p>';
    endif;

    echo json_encode( array(
        'posts' => json_encode( $wp_query->query_vars ),
        'max_page' => $wp_query->max_num_pages,
        'found_posts' => $wp_query->found_posts,
        'content' => $posts_html,
    ) );

    die();
}

和HTML：

<input id="filter_toggle"  type="checkbox">
<?php //We need to save the varaibles in arrays, so we can then check them against the URL and populate the dropdowns

$price_min = [
'' => 'Any Price',
'100000' => '$100,000',
'150000' => '$150,000',
'200000' => '$200,000',
'250000' => '$250,000',
//etc
];

$price_max = [
'' => 'Any Price',
'100000' => '$100,000',
'150000' => '$150,000',
'200000' => '$200,000',
'250000' => '$250,000',
//etc
];

$beds = [
'' => 'All Beds',
'1' => '1+',
'2' => '2+',
'3' => '3+',
'4' => '4+',
'5' => '5+'
];

$property_type = [
'' => 'All Property Types',
'single-family-home' => 'Single Family Home',
'condo' => 'Condo',
'land' => 'Land',
'townhouse' => 'Townhouse'
];

$sort_by = [
'newest' => 'Sort by Newest',
'price-desc' => 'Sort by Price (High to Low)',
'price-asc' => 'Sort by Price (Low to High)',
'bedrooms-desc' => 'Sort by Beds (Most to Least)',
'bedrooms-asc' => 'Sort by Beds (Least to Most)'
];
?>

<form action="<?php echo site_url() ?>/wp-admin/admin-ajax.php" method="POST" id="filter">
<div class="filters_options">

  <select name="price_min" class="min_max_select">
    <option disabled="disabled" selected="" value="">Minimum Price</option>
    <?php foreach ($price_min as $key => $value) {
         $selected = '';
         if ($_GET['price_min'] == $key) {
             $selected = ' selected="selected"';
         }
         printf(
             '<option value="%s"%s>%s</option>',
             $key,
             $selected,
             $value
         );
     } ?>
  </select>

  <select name="price_max" class="min_max_select">
    <option disabled="disabled" selected="selected" value="">Maximum Price</option>
    <?php foreach ($price_max as $key => $value) {
         $selected = '';
         if ($_GET['price_max'] == $key) {
             $selected = ' selected="selected"';
         }
         printf(
             '<option value="%s"%s>%s</option>',
             $key,
             $selected,
             $value
         );
     } ?>
  </select>

  <select name="beds" class="select_beds">
    <option disabled="disabled" selected="selected" value="">Bedrooms</option>
    <?php foreach ($beds as $key => $value) {
         $selected = '';
         if ($_GET['beds'] == $key) {
             $selected = ' selected="selected"';
         }
         printf(
             '<option value="%s"%s>%s</option>',
             $key,
             $selected,
             $value
         );
     } ?>
  </select>

  <!-- <select>
    <option disabled="disabled" selected="selected" value="">Bathrooms</option>
    <option value="">All Baths</option>
    <option value="1+">1+</option>
    <option value="1+">2+</option>
    <option value="1+">3+</option>
    <option value="1+">4+</option>
    <option value="1+">5+</option>
  </select> -->

  <select name="type" class="sort_by_property_type">
    <option disabled="disabled" selected="selected" value="">Property Type</option>
    <?php foreach ($property_type as $key => $value) {
         $selected = '';
         if ($_GET['type'] == $key) {
             $selected = ' selected="selected"';
         }
         printf(
             '<option value="%s"%s>%s</option>',
             $key,
             $selected,
             $value
         );
     } ?>
  </select>

  <!-- <select>
    <option disabled="disabled" selected="selected" value="">Property View</option>
    <option value="">All Property Views</option>
    <option value="Golf View">Golf View</option>
    <option value="Ocean View">Ocean View</option>
    <option value="Ocean Front">Ocean Front</option>
  </select> -->

  <select name="sort_by" class="sort_by_dropdown">
    <?php
     foreach ($sort_by as $key => $value) {
         $selected = '';
         if ($_GET['sort_by'] == $key) {
             $selected = ' selected="selected"';
         }
         printf(
             '<option value="%s"%s>%s</option>',
             $key,
             $selected,
             $value
         );
     }
     ?>
  </select>

<input type="hidden" name="action" value="prop_filters" />
</div>

 <span class="reset_btn reset">reset</span>
<label class="done_btn" for="filter_toggle">Done</label>
</form> 
</div>

<ul id="main_posts" class="item-listings">
<?php 

//*
// Sort by Args
//*

    if( $_GET['sort_by'] === 'price-desc' ) {
        $orderby = 'meta_value_num'; 
        $order = 'DESC';
        $meta_key = 'price';
    }

    elseif( $_GET['sort_by'] === 'price-asc' ) {
        $orderby = 'meta_value_num'; 
        $order = 'ASC';
        $meta_key = 'price';
    }
    elseif( $_GET['sort_by'] === 'bedrooms-desc' ) {
        $orderby = 'meta_value_num'; 
        $order = 'DESC';
        $meta_key = 'bedrooms';
    }
    elseif( $_GET["sort_by"] === 'bedrooms-asc' ) {
        $orderby = 'meta_value_num'; 
        $order = 'ASC';
        $meta_key = 'bedrooms';
    }
    else {
        $orderby = 'date'; 
        $order = 'DESC';
        $meta_key = '';
    }

    $per_page = 9;

    if(!empty( $_GET['page'])) {
        $per_page = $_GET['page'] * 9;
    }

// Build the inital Loop
$args = prepare_property_filters([
    'posts_per_page' => $per_page,
    'paged' => $_POST['page'],
    'meta_key' => $meta_key,
    'orderby' => $orderby,
    'order' => $order
]);

query_posts($args);

if( have_posts() ) :

    while( have_posts() ): the_post();

        get_template_part( 'template-parts/post/content', get_post_format() );

        $count_posts = $wp_query->found_posts; 

    endwhile;
endif;

?>
</ul>


<?php if (  $wp_query->max_num_pages > 1 ) :
    echo '<div id="prop_loadmore">More Listings</div>';
endif;?>

<span class="listings-count"><?php echo $count_posts;?> Real Estate Listings for Sale</span>
<!-- <span class="reset">reset</span> -->

#prop_loadmore单击时将执行以下代码块：

var params = new URLSearchParams(location.search);
params.set('page', prop_loadmore_params.current_page);
window.history.replaceState({}, "", decodeURIComponent(`${location.pathname}?${params}`));

prop_loadmore_params当单击按钮时，您正在使用它来递增其当前页面，但似乎没有对price_min或的任何引用。price_max

您应该进行调整$('#prop_loadmore').click(function(){...})以包括以下内容：

var params = new URLSearchParams(location.search);

params.set('page', prop_loadmore_params.current_page);

//Add All Additional Parameters in this way
if (prop_loadmore_params.price_min){
     params.set('price_min', prop_loadmore_params.price_min);
}
if (prop_loadmore_params.price_max){
     params.set('price_max', prop_loadmore_params.price_max);
}
// ...

window.history.replaceState({}, "", decodeURIComponent(`${location.pathname}?${params}`));

然后$('#filter').change(function(){})确保将过滤后的值添加到prop_loadmore_params对象。

让我知道事情的后续！

您使用AJAX 发送POST，但是使用$ _GET ['page']签入PHP

if (!empty($_GET['page'])) {
    $the_page = $_GET['page'];
}

您可以使用$ _REQUEST

最后，我自己解决了这个问题。我这样做的方法是，在loadmore AJAX运行之前，将URL参数传递给变量，具体方法如下

var url_string = window.location;
var price_min = (new URL(url_string)).searchParams.get("price_min");
var price_max = (new URL(url_string)).searchParams.get("price_max");
var bedrooms = (new URL(url_string)).searchParams.get("beds");
var property_type = (new URL(url_string)).searchParams.get("type");
var sort_by = (new URL(url_string)).searchParams.get("sort_by");
var the_page = (new URL(url_string)).searchParams.get("page");

然后，通过单击“加载更多”按钮，使请求在ajax调用上工作