Bài viết này thực hiện (hoặc lụm bài về đăng câu like từ các trang khác) bởi Việt Lâm Coder một YOUTUBER có tâm và đẹp trai siêu cấp vô địch zũ trụ.
Mục lục
Creating Load More button for WordPress is really simple. As an option I will show you how to load more posts on scroll
When my blog subscriber asked me about a such tutorial, I was wondering if there are any other analogue tutorials over the internet. And what I found in Google, surprised me.
Reading all those tutorials one thing becomes clear for me – AJAX is not simple at all. But it is not true!
Step 1. Load more button #
Just skip this step if you want to load more posts on scroll.
We begin with the button HTML. Here is just one main rule – do not show the button if there are not enough posts. We will check it with $wp_query->max_num_pages.
|
1 2 3 4 5 6 7 |
<?php global $wp_query; // you can remove this line if everything works for you // don't display the button if there are not enough posts if ( $wp_query->max_num_pages > 1 ) echo '<div class="misha_loadmore">More posts</div>'; // you can use <a> as well ?> |
On the image below you can see that I decided to work with Twenty Seventeen theme because it is well-designed and simple enough.
I inserted the button just under the standart pagination (for TwentySeventeen – index.php line 55), but you can remove it as well. To style the button the according way use CSS below.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 |
.misha_loadmore<span class="br0">{</span> background-color: #ddd; border-radius: 2px; display: block; text-align: center; font-size: 14px; font-size: 0.875rem; font-weight: 800; letter-spacing:1px; cursor:pointer; text-transform: uppercase; padding: 10px 0; transition: background-color 0.2s ease-in-out, border-color 0.2s ease-in-out, color 0.3s ease-in-out; <span class="br0">}</span> .misha_loadmore:hover<span class="br0">{</span> background-color: #767676; color: #fff; <span class="br0">}</span> |
Step 2. Enqueue jQuery and myloadmore.js. Pass query parameters to the script. #
Well, that’s where the magic happens. This small piece of code allows you to pass the according parameters to the script that’s why the button can work on any page – tags, categories, post type archives, search etc.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 |
function misha_my_load_more_scripts() { global $wp_query; // In most cases it is already included on the page and this line can be removed wp_enqueue_script('jquery'); // register our main script but do not enqueue it yet wp_register_script( 'my_loadmore', get_stylesheet_directory_uri() . '/myloadmore.js', array('jquery') ); // now the most interesting part // we have to pass parameters to myloadmore.js script but we can get the parameters values only in PHP // you can define variables directly in your HTML but I decided that the most proper way is wp_localize_script() wp_localize_script( 'my_loadmore', 'misha_loadmore_params', array( 'ajaxurl' => site_url() . '/wp-admin/admin-ajax.php', // WordPress AJAX 'posts' => json_encode( $wp_query->query_vars ), // everything about your loop is here 'current_page' => get_query_var( 'paged' ) ? get_query_var('paged') : 1, 'max_page' => $wp_query->max_num_pages ) ); wp_enqueue_script( 'my_loadmore' ); } add_action( 'wp_enqueue_scripts', 'misha_my_load_more_scripts' ); |
If you still do not know, the above code is for your functions.php. And please note, my load more button is adapted for the main loop only. If you need it for a custom loop, ask me in comments.
Step 3. myloadmore.js – what is inside? #
It is a small JS file, actually you can place it anywhere you want, for simpleness I decided to place it just in a theme directory (line 9 of previous code).
I also think that I should give you a choice – a load more button or just load posts by scroll.
Option 1. Load More button
If you choose the option 1, skip the option 2 and vice versa.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 |
jQuery(function($){ $('.misha_loadmore').click(function(){ var button = $(this), data = { 'action': 'loadmore', 'query': misha_loadmore_params.posts, // that's how we get params from wp_localize_script() function 'page' : misha_loadmore_params.current_page }; $.ajax({ url : misha_loadmore_params.ajaxurl, // AJAX handler data : data, type : 'POST', beforeSend : function ( xhr ) { button.text('Loading...'); // change the button text, you can also add a preloader image }, success : function( data ){ if( data ) { button.text( 'More posts' ).prev().before(data); // insert new posts misha_loadmore_params.current_page++; if ( misha_loadmore_params.current_page == misha_loadmore_params.max_page ) button.remove(); // if last page, remove the button // you can also fire the "post-load" event here if you use a plugin that requires it // $( document.body ).trigger( 'post-load' ); } else { button.remove(); // if no data, remove the button as well } } }); }); }); |
Please note that line 23 can be different for your theme, it depends on your HTML document structure. I think you should know some basic jQuery DOM traversal methods – prev(), next(), parent() etc.
Option 2. No button, just load posts on scroll
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
jQuery(function($){ var canBeLoaded = true, // this param allows to initiate the AJAX call only if necessary bottomOffset = 2000; // the distance (in px) from the page bottom when you want to load more posts $(window).scroll(function(){ var data = { 'action': 'loadmore', 'query': misha_loadmore_params.posts, 'page' : misha_loadmore_params.current_page }; if( $(document).scrollTop() > ( $(document).height() - bottomOffset ) && canBeLoaded == true ){ $.ajax({ url : misha_loadmore_params.ajaxurl, data:data, type:'POST', beforeSend: function( xhr ){ // you can also add your own preloader here // you see, the AJAX call is in process, we shouldn't run it again until complete canBeLoaded = false; }, success:function(data){ if( data ) { $('#main').find('article:last-of-type').after( data ); // where to insert posts canBeLoaded = true; // the ajax is completed, now we can run it again misha_loadmore_params.current_page++; } } }); } }); }); |
Step 4. wp_ajax_ #
This is the AJAX handler function. Insert it to your functions.php file.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 |
function misha_loadmore_ajax_handler(){ // prepare our arguments for the query $args = json_decode( stripslashes( $_POST['query'] ), true ); $args['paged'] = $_POST['page'] + 1; // we need next page to be loaded $args['post_status'] = 'publish'; // it is always better to use WP_Query but not here query_posts( $args ); if( have_posts() ) : // run the loop while( have_posts() ): the_post(); // look into your theme code how the posts are inserted, but you can use your own HTML of course // do you remember? - my example is adapted for Twenty Seventeen theme get_template_part( 'template-parts/post/content', get_post_format() ); // for the test purposes comment the line above and uncomment the below one // the_title(); endwhile; endif; die; // here we exit the script and even no wp_reset_query() required! } add_action('wp_ajax_loadmore', 'misha_loadmore_ajax_handler'); // wp_ajax_{action} add_action('wp_ajax_nopriv_loadmore', 'misha_loadmore_ajax_handler'); // wp_ajax_nopriv_{action} |
Bài viết này thực hiện (hoặc lụm bài về đăng câu like từ các trang khác) bởi Việt Lâm Coder một YOUTUBER có tâm và đẹp trai siêu cấp vô địch zũ trụ.
