{"id":27648,"date":"2021-05-20T12:42:00","date_gmt":"2021-05-20T09:42:00","guid":{"rendered":"https:\/\/themewp.inform.click\/?p=27648"},"modified":"2021-10-18T04:10:50","modified_gmt":"2021-10-18T01:10:50","slug":"como-carregar-posts-wordpress-com-ajax","status":"publish","type":"post","link":"https:\/\/themewp.inform.click\/pt-pt\/como-carregar-posts-wordpress-com-ajax\/","title":{"rendered":"Como carregar posts WordPress com AJAX"},"content":{"rendered":"

Estou executando um canal no YouTube<\/a> onde posto v\u00eddeos relacionados a programa\u00e7\u00e3o e software. Recentemente, um dos assinantes me perguntou como carregar uma postagem do WordPress com AJAX. Em resposta a ele, decidi escrever um post sobre sua pergunta. Portanto, neste artigo, estudamos como carregar uma postagem do WordPress com AJAX usando um bot\u00e3o carregar mais e rolar a p\u00e1gina.<\/p>\n

A diferen\u00e7a entre carregar mais e uma rolagem de p\u00e1gina \u00e9 bastante simples. Ao usar o bot\u00e3o carregar mais, voc\u00ea precisa clicar em um bot\u00e3o para ver o pr\u00f3ximo conjunto de postagens. E na rolagem de p\u00e1gina, quando voc\u00ea rola para o final de uma janela de visualiza\u00e7\u00e3o, o pr\u00f3ximo conjunto de postagens deve ser carregado automaticamente.<\/p>\n

Vamos supor que voc\u00ea tenha algumas postagens e precise exibir 2 postagens no carregamento da p\u00e1gina e, em seguida, clicando em ‘Carregar mais’ ou em ‘Rolagem da p\u00e1gina’, as pr\u00f3ximas 2 postagens devem ser exibidas. Este processo continuar\u00e1 at\u00e9 que todas as suas postagens sejam exibidas.<\/p>\n

Crie uma nova p\u00e1gina chamada ‘Blog’. Para exibir suas postagens na p\u00e1gina Blog, crie um modelo personalizado page-blog.php<\/code>no diret\u00f3rio de seu tema ativo.<\/p>\n

Agora, quando os usu\u00e1rios visitam a p\u00e1gina do seu blog, eles devem ver 2 postagens. Portanto, adicione o c\u00f3digo abaixo em seu arquivo de modelo personalizado.<\/p>\n

<div class=\"entry-content\">\n\u00a0\u00a0\u00a0\u00a0<?php\n\u00a0\u00a0\u00a0\u00a0$args = array(\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'post_type' => 'post',\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'post_status' => 'publish',\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'posts_per_page' => '2',\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'paged' => 1,\n\u00a0\u00a0\u00a0\u00a0);\n\u00a0\u00a0\u00a0\u00a0$blog_posts = new WP_Query( $args );\n\u00a0\u00a0\u00a0\u00a0?>\n\u00a0\n\u00a0\u00a0\u00a0\u00a0<?php if ($blog_posts->have_posts() ): ?>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<div class=\"blog-posts\">\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<?php while ($blog_posts->have_posts() ): $blog_posts->the_post(); ?>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<h2><?php the_title(); ?><\/h2>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<?php the_excerpt(); ?>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<?php endwhile; ?>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/div>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<div class=\"loadmore\">Load More...<\/div>\n\u00a0\u00a0\u00a0\u00a0<?php endif; ?>\n<\/div><\/code><\/pre>\n
Aqui, usei a chave ‘paginada’ e passei o valor ‘1’ para ela. ‘paginado’ \u00e9 uma chave usada no WordPress quando se trata de pagina\u00e7\u00e3o. ‘paged’ => 1 significa a primeira p\u00e1gina.<\/p>\n
Voc\u00ea notaria o elemento div com a classe ‘loadmore’. Ao clicar em Carregar mais, faremos uma chamada Ajax e obteremos o pr\u00f3ximo conjunto de postagens.<\/p>\n
Carregar Postagens WordPress com Ajax no Bot\u00e3o Carregar Mais<\/h3>\n
Para fazer uma chamada Ajax, voc\u00ea precisa incluir o arquivo JS no ambiente WordPress. Crie um custom.js<\/code>arquivo dentro do js<\/code>diret\u00f3rio e, em seguida, adicione o c\u00f3digo abaixo no functions.php<\/code>arquivo.<\/p>\n
function blog_scripts() {\n\u00a0\u00a0\u00a0\u00a0\/\/ Register the script\n\u00a0\u00a0\u00a0\u00a0wp_register_script( 'custom-script', get_stylesheet_directory_uri(). '\/js\/custom.js', array('jquery'), false, true );\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\/\/ Localize the script with new data\n\u00a0\u00a0\u00a0\u00a0$script_data_array = array(\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'ajaxurl' => admin_url( 'admin-ajax.php' ),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'security' => wp_create_nonce( 'load_more_posts' ),\n\u00a0\u00a0\u00a0\u00a0);\n\u00a0\u00a0\u00a0\u00a0wp_localize_script( 'custom-script', 'blog', $script_data_array );\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\/\/ Enqueued script with localized data.\n\u00a0\u00a0\u00a0\u00a0wp_enqueue_script( 'custom-script' );\n}\nadd_action( 'wp_enqueue_scripts', 'blog_scripts' );<\/code><\/pre>\n
A seguir, vamos escrever um pouco de jQuery e dar uma chamada Ajax que em troca dar\u00e1 os pr\u00f3ximos posts.<\/p>\n
custom.js<\/strong><\/p>\n
var page = 2;\njQuery(function($) {\n\u00a0\u00a0\u00a0\u00a0$('body').on('click', '.loadmore', function() {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0var data = {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'action': 'load_posts_by_ajax',\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'page': page,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'security': blog.security\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0};\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$.post(blog.ajaxurl, data, function(response) {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if($.trim(response) != '') {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$('.blog-posts').append(response);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0page++;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0} else {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$('.loadmore').hide();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0});\n\u00a0\u00a0\u00a0\u00a0});\n});<\/code><\/pre>\n
O que estamos fazendo aqui \u00e9 pegar uma ‘p\u00e1gina’ de vari\u00e1vel javascript com valor inicial 2, pois vamos come\u00e7ar com a pagina\u00e7\u00e3o de segunda p\u00e1gina. Estou incrementando esta vari\u00e1vel ‘p\u00e1gina’ ap\u00f3s receber a resposta do Ajax. Depois de obter a resposta, vou anex\u00e1-la \u00e0 lista de postagens existentes.<\/p>\n
Eu tamb\u00e9m usei o par\u00e2metro de a\u00e7\u00e3o como ‘load_posts_by_ajax’ para uma chamada Ajax que precisa ser mapeada com a\u00e7\u00f5es do WordPress. Abra seu functions.php<\/code>arquivo e adicione o c\u00f3digo abaixo a um arquivo.<\/p>\n
add_action('wp_ajax_load_posts_by_ajax', 'load_posts_by_ajax_callback');\nadd_action('wp_ajax_nopriv_load_posts_by_ajax', 'load_posts_by_ajax_callback');<\/code><\/pre>\n
Nas a\u00e7\u00f5es do WordPress acima, chamamos a fun\u00e7\u00e3o de retorno de chamada load_posts_by_ajax_callback<\/code>que irei definir na pr\u00f3xima etapa. Voc\u00ea pode definir esta fun\u00e7\u00e3o em seu functions.php<\/code>.<\/p>\n
function load_posts_by_ajax_callback() {\n\u00a0\u00a0\u00a0\u00a0check_ajax_referer('load_more_posts', 'security');\n\u00a0\u00a0\u00a0\u00a0$paged = $_POST['page'];\n\u00a0\u00a0\u00a0\u00a0$args = array(\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'post_type' => 'post',\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'post_status' => 'publish',\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'posts_per_page' => '2',\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'paged' => $paged,\n\u00a0\u00a0\u00a0\u00a0);\n\u00a0\u00a0\u00a0\u00a0$blog_posts = new WP_Query( $args );\n\u00a0\u00a0\u00a0\u00a0?>\n\u00a0\n\u00a0\u00a0\u00a0\u00a0<?php if ($blog_posts->have_posts() ): ?>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<?php while ($blog_posts->have_posts() ): $blog_posts->the_post(); ?>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<h2><?php the_title(); ?><\/h2>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<?php the_excerpt(); ?>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<?php endwhile; ?>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<?php\n\u00a0\u00a0\u00a0\u00a0endif;\n\u00a0\n\u00a0\u00a0\u00a0\u00a0wp_die();\n}<\/code><\/pre>\n
Agora, quando voc\u00ea clicar no bot\u00e3o ‘Carregar mais’, ele carregar\u00e1 as pr\u00f3ximas postagens por meio do Ajax e retornar\u00e1 em resposta. O c\u00f3digo JavaScript escrito acima trataria do restante.<\/p>\n
Carregar Postagens WordPress com Ajax na Rolagem da P\u00e1gina<\/h3>\n
Alguns usu\u00e1rios podem n\u00e3o querer um bot\u00e3o carregar mais para exibir as postagens com Ajax. Em vez disso, eles preferem que as postagens sejam exibidas assim que o usu\u00e1rio atingir o final de uma janela de visualiza\u00e7\u00e3o.<\/p>\n
Para conseguir isso, voc\u00ea precisa escrever uma l\u00f3gica que capture o evento no final de uma janela de visualiza\u00e7\u00e3o, o resto do c\u00f3digo \u00e9 o mesmo que o bot\u00e3o ‘Carregar mais’. Abaixo est\u00e1 o c\u00f3digo jQuery para rolagem de p\u00e1gina.<\/p>\n
jQuery(window).scroll(function($) {\n\u00a0\u00a0\u00a0\u00a0if (jQuery(window).scrollTop() + jQuery(window).height() > jQuery(document).height()) {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0var data = {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'action': 'load_posts_by_ajax',\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'page': page,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0'security': blog.security\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0};\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$.post(blog.ajaxurl, data, function(response) {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if($.trim(response) != '') {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$('.blog-posts').append(response);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0page++;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0} else {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$('.loadmore').hide();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0});\n\u00a0\u00a0\u00a0\u00a0}\n});<\/code><\/pre>\n
\u00c9 isso! Voc\u00ea pode ir em frente e experimentar. Gostaria de saber sua opini\u00e3o e sugest\u00f5es nos coment\u00e1rios abaixo.<\/p>\n
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