{"id":25161,"date":"2021-05-27T15:07:00","date_gmt":"2021-05-27T12:07:00","guid":{"rendered":"https:\/\/themewp.inform.click\/?p=25161"},"modified":"2021-10-18T03:09:55","modified_gmt":"2021-10-18T00:09:55","slug":"come-integrare-il-caricamento-di-file-ajax-in-wordpress","status":"publish","type":"post","link":"https:\/\/themewp.inform.click\/it\/come-integrare-il-caricamento-di-file-ajax-in-wordpress\/","title":{"rendered":"Come integrare il caricamento di file Ajax in WordPress"},"content":{"rendered":"

Vuoi implementare il caricamento di file Ajax in WordPress? A volte, \u00e8 necessario eseguire un’attivit\u00e0 che carica un file tramite Ajax. In questo articolo, studiamo come eseguire il caricamento di file Ajax in WordPress.<\/p>\n

Un vantaggio del caricamento di file tramite Ajax \u00e8 che riduce il carico del server. La tua pagina non si ricaricher\u00e0, risparmiando chiamate extra a un server e quindi la larghezza di banda. Aggiunge anche una migliore esperienza utente sul tuo sito web.<\/p>\n

Normalmente mentre lavoriamo con Ajax, diamo una chiamata all’URL e passiamo o otteniamo dati dall’URL specificato. WordPress ha un modo leggermente diverso di eseguire operazioni Ajax. In WordPress, chiamiamo l’URL ma il codice che scriviamo per elaborare i dati andr\u00e0 nella funzione. Quindi questa funzione deve essere mappata con il valore "action" passato nei parametri Ajax. Confuso? Vediamolo in azione.<\/p>\n

Caricamento di file Ajax in WordPress<\/h3>\n

Per iniziare, \u00e8 necessario un modulo con l’input del file. Diamo una chiamata Ajax sulla selezione di un file e carichiamo il file su un server. Per creare un modulo, aggiungi l’HTML sottostante al tuo modello di pagina.<\/p>\n

<form class=\"fileUpload\" enctype=\"multipart\/form-data\">\n\u00a0\u00a0\u00a0\u00a0<div class=\"form-group\">\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<label><?php _e('Choose File:'); ?><\/label>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<input type=\"file\" id=\"file\" accept=\"image\/*\" \/>\n\u00a0\u00a0\u00a0\u00a0<\/div>\n<\/form><\/code><\/pre>\n
Successivamente, devi dare una chiamata Ajax sull’evento di modifica dell’input del file. Poich\u00e9 stiamo passando un contenuto di file ad Ajax, il tuo codice sar\u00e0 leggermente diverso rispetto al normale codice jQuery di WordPress Ajax<\/a>.<\/p>\n
Includi file JS in WordPress<\/h4>\n
Per prima cosa includiamo il file JS in un ambiente WordPress. Questo codice andr\u00e0 all’interno del functions.php<\/code>file o in un plug-in specifico del sito.<\/p>\n
function aw_scripts() {\n\u00a0\u00a0\u00a0\u00a0\/\/ Register the script\n\u00a0\u00a0\u00a0\u00a0wp_register_script( 'aw-custom', get_stylesheet_directory_uri(). '\/js\/custom.js', array('jquery'), '1.1', 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);\n\u00a0\u00a0\u00a0\u00a0wp_localize_script( 'aw-custom', 'aw', $script_data_array );\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\/\/ Enqueued script with localized data.\n\u00a0\u00a0\u00a0\u00a0wp_enqueue_script( 'aw-custom' );\n}\n\u00a0\nadd_action( 'wp_enqueue_scripts', 'aw_scripts' );<\/code><\/pre>\n
Carica file sul server<\/h4>\n
Sei pronto con il modulo e il file JS. Ora aggiungi il codice seguente nel file JS che invier\u00e0 il contenuto del file al lato server tramite Ajax.<\/p>\n
custom.js<\/strong><\/p>\n
jQuery(function($) {\n\u00a0\u00a0\u00a0\u00a0$('body').on('change', '#file', function() {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this = $(this);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0file_data = $(this).prop('files')[0];\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0form_data = new FormData();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0form_data.append('file', file_data);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0form_data.append('action', 'file_upload');\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$.ajax({\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0url: aw.ajaxurl,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0type: 'POST',\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0contentType: false,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0processData: false,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0data: form_data,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0success: function (response) {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this.val('');\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0alert('File uploaded successfully.');\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0});\n\u00a0\u00a0\u00a0\u00a0});\u00a0\u00a0\u00a0 \n});<\/code><\/pre>\n
La parte importante del codice sopra \u00e8 che aggiungiamo un’azione ‘file_upload’ all’oggetto form_data. Useremo questa azione ‘file_upload’ per procedere con i dati del modulo.<\/p>\n
In functions.php<\/code>, mappa questa azione con l’Ajax come segue:<\/p>\n
add_action( 'wp_ajax_file_upload', 'file_upload_callback' );\nadd_action( 'wp_ajax_nopriv_file_upload', 'file_upload_callback' );<\/code><\/pre>\n
Se stai scrivendo questo codice in un plugin, non hai bisogno di scrivere una seconda istruzione. Qui a ‘wp ajax_’ e ‘wp_ajax_nopriv ‘ aggiungiamo il valore dell’azione che \u00e8 ‘file_upload’. Il secondo parametro ‘file_upload_callback’ \u00e8 il metodo di callback che avr\u00e0 il codice effettivo per il caricamento del file.<\/p>\n
function file_upload_callback() {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$arr_img_ext = array('image\/png', 'image\/jpeg', 'image\/jpg', 'image\/gif');\n\u00a0\u00a0\u00a0\u00a0if (in_array($_FILES['file']['type'], $arr_img_ext)) {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$upload = wp_upload_bits($_FILES[\"file\"][\"name\"], null, file_get_contents($_FILES[\"file\"][\"tmp_name\"]));\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/$upload['url'] will gives you uploaded file path\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0wp_die();\n}<\/code><\/pre>\n
Sto usando un metodo wp_upload_bits<\/a> per caricare file su un server. Questo metodo memorizza direttamente un file all’interno della directory wp-content\/uploads.<\/p>\n
Vai avanti e prova a caricare un file. Il tuo file dovrebbe essere caricato nella cartella wp-content\/uploads\/. Tieni presente che troverai il tuo file nella cartella del mese corrente della directory dei caricamenti.<\/p>\n
Carica pi\u00f9 file usando Ajax in WordPress<\/h3>\n
Finora abbiamo discusso del caricamento di un singolo file tramite Ajax. Potrebbe verificarsi una situazione in cui desideri caricare pi\u00f9 file utilizzando Ajax. Vediamo come realizzarlo.<\/p>\n
Per caricare pi\u00f9 file, \u00e8 necessario apportare lievi modifiche al codice HTML, JS e PHP di cui sopra.<\/p>\n
L’HTML fornisce un attributo ‘multiplo’ che consente a un utente di selezionare pi\u00f9 file sull’input del file.<\/p>\n
Codice HTML<\/strong><\/p>\n
<form class=\"fileUpload\" enctype=\"multipart\/form-data\">\n\u00a0\u00a0\u00a0\u00a0<div class=\"form-group\">\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<label><?php _e('Choose File:'); ?><\/label>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<input type=\"file\" id=\"file\" accept=\"image\/*\" multiple \/>\n\u00a0\u00a0\u00a0\u00a0<\/div>\n<\/form><\/code><\/pre>\n
Poich\u00e9 un utente seleziona pi\u00f9 file, \u00e8 necessario modificare il codice JavaScript che scorre attraverso ciascun file e ne crea un array.<\/p>\n
custom.js<\/strong><\/p>\n
jQuery(function($) {\n\u00a0\u00a0\u00a0\u00a0$('body').on('change', '#file', function() {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this = $(this);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0file_obj = $this.prop('files');\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0form_data = new FormData();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for(i=0; i<file_obj.length; i++) {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0form_data.append('file[]', file_obj[i]);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0form_data.append('action', 'file_upload');\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$.ajax({\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0url: aw.ajaxurl,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0type: 'POST',\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0contentType: false,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0processData: false,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0data: form_data,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0success: function (response) {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this.val('');\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0alert('File(s) uploaded successfully.');\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0});\n\u00a0\u00a0\u00a0\u00a0});\n});<\/code><\/pre>\n
E infine, nella funzione di callback Ajax, eseguiamo un ciclo attraverso l’array di file e carichiamo ogni file su un server.<\/p>\n
function file_upload_callback() {\n\u00a0\u00a0\u00a0\u00a0$arr_img_ext = array('image\/png', 'image\/jpeg', 'image\/jpg', 'image\/gif');\n\u00a0\n\u00a0\u00a0\u00a0\u00a0for($i = 0; $i < count($_FILES['file']['name']); $i++) {\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if (in_array($_FILES['file']['type'][$i], $arr_img_ext)) {\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$upload = wp_upload_bits($_FILES['file']['name'][$i], null, file_get_contents($_FILES['file']['tmp_name'][$i]));\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/$upload['url'] will gives you uploaded file path\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0wp_die();\n}<\/code><\/pre>\n
Spero che tu sappia del caricamento di file Ajax in WordPress. Mi piacerebbe sentire i tuoi pensieri e suggerimenti nella sezione commenti qui sotto.<\/p>\n
articoli Correlati<\/h4>\n