Wordpress Lazy Loading using Pagination - ajax

Question

im doing a lazy loading with WP_Query Pagination
it's working fine but the content duplicate itself when it reaches it's end
and when i search for a specific result it shows the result correctly
but after that it still want to do lazy load so it load random data
here is my code
lazy-load.php
<?php
add_action('wp_ajax_nopriv_load_posts_by_ajax', 'load_posts_by_ajax_callback');
add_action('wp_ajax_load_posts_by_ajax', 'load_posts_by_ajax_callback');
function load_posts_by_ajax_callback(){
// check_ajax_referer( 'load_more_posts', 'security' );
$paged = $_POST['page'];
$args = array(
'post_type' => 'unit',
'post_status' => 'publish',
'posts_per_page' => 4,
'paged' => $paged
);
if ( !empty($_POST['taxonomy']) && !empty($_POST['term_id']) ){
$args['tax_query'] = array (
array(
'taxonomy' => $_POST['taxonomy'],
'terms' => $_POST['term_id'],
),
);
}
if ( ! is_null($_POST['offer']) ) {
$args['meta_query'][] = array(
'key' => 'WAKEB_hot',
'value' => '1',
'compare' => '=',
);
}
if ( ! is_null($_POST['purpose']) ) {
$args['meta_query'][] = array(
'key' => 'WAKEB_vacation',
'value' => '1',
'compare' => '=',
);
}
if (!empty($_POST['project'])){
$args['meta_query'] = array (
array(
'key' => 'WAKEB_project',
'value' => $_POST['project'],
'compare' => '='
),
);
}
// start buffer
ob_start();
$query = new WP_Query( $args );
if ( $query->have_posts() ) :
while($query->have_posts()){ $query->the_post();
get_template_part("template-parts/units");
}
endif; wp_reset_postdata();
// start buffered data in data variable
$data = ob_get_clean();
wp_send_json_success( $data );
wp_die();
}
add_action('wp_ajax_nopriv_load_projects_by_ajax', 'load_projects_by_ajax_callback');
add_action('wp_ajax_load_projects_by_ajax', 'load_projects_by_ajax_callback');
function load_projects_by_ajax_callback(){
// check_ajax_referer( 'load_more_posts', 'security' );
$paged = $_POST['page'];
$args = array(
'post_type' => 'project',
'post_status' => 'publish',
'posts_per_page' => 4,
'paged' => $paged
);
if ( ! is_null($_POST['ptype']) ) {
$args['tax_query'] = array (
array(
'taxonomy' => 'pptypes',
'field' => 'slug',
'terms' => $_POST['ptype'],
),
);
}
if ( !empty($_POST['taxonomy']) && !empty($_POST['term_id']) ){
$args['tax_query'] = array (
array(
'taxonomy' => $_POST['taxonomy'],
'terms' => $_POST['term_id'],
),
);
}
// start buffer
ob_start();
$query = new WP_Query( $args );
if ( $query->have_posts() ) :
while($query->have_posts()){ $query->the_post();
get_template_part("template-parts/projects");
}
endif; wp_reset_postdata();
// start buffered data in data variable
$data = ob_get_clean();
wp_send_json_success( $data );
wp_die();
}
lazy-load.js
$('.unit-terms li a').each( function() {
if ( this.href == window.location.href ) {
$(this).parent().addClass('current');
}
});
main.js
(function($){
$('.isotope a').on('click', function(){
$('.isotope .active').removeClass('active');
$(this).addClass('active');
var filter = $(this).data('filter');
if(filter=='*'){
$('.property').show();
}else{
$('.property').not(filter).hide();
$('.property'+filter).show();
}
return false;
});
})(jQuery);
so how can i make it work? i don't know what im doing wrong here
Here is the repo link for the full project
https://github.com/Ov3rControl/hoomerz

Answer 1

ok, now I understand what you meant ;) During lazy load you send to backend only page number without current state of filters and / or search string. So it sends all posttype items based on page number only. You should send also current state of filters
main.js: add this to your after-page-load function:
var currentUrl = new URL(window.location.href);
var searchQuery = urlObj.searchParams.get("k");
lazy-load.js: add search param to data posted to backend
var data = {
'action': 'load_posts_by_ajax',
'page': page,
'search: searchQuery // new field
};
lazy-load.php: add search param to WP_Query
if ( isset($_POST['search']) && !empty($_POST['search']) ){ // new section
$args['s'] = sanitize_text_field($_POST['search']);
}
That's example for text search filter. For all filters you must
1. match every filter from front (URL get param) (main.js)
2. than put it in data object sent to backend (lazy-load.js)
3. address this variable in lazy-load.php in if(isset($_POST['param-name'])) section ( new or existing one as there are some )

Answer 2

I suggest to try without ob_start() / ob_get_clean(). Also if you generate html instead of raw data structure, I would simply print it to output without wp_send_json_success().
Other solution would be sending raw data (1. array in php, 2. json_encode(), 3. wp_send_json() ) and than processing in javascript (dynamic dom element creation after request to backend made).