{"id":2406,"date":"2012-03-30T20:20:32","date_gmt":"2012-03-30T20:20:32","guid":{"rendered":"https:\/\/www.jose-aguilar.com\/blog\/?p=2406"},"modified":"2019-04-15T15:54:14","modified_gmt":"2019-04-15T15:54:14","slug":"autocompletar-campo-con-jquery-ajax-y-php","status":"publish","type":"post","link":"https:\/\/www.jose-aguilar.com\/blog\/autocompletar-campo-con-jquery-ajax-y-php\/","title":{"rendered":"Autocompletar campo con jQuery, Ajax y PHP"},"content":{"rendered":"

Amplia tu conocimiento y obt\u00e9n un c\u00f3digo de ejemplo que te permite autocompletar<\/strong> un campo de texto con jQuery<\/strong>, Ajax<\/strong> y PHP<\/strong>.<\/p>\n

En el ejemplo en funcionamiento vamos a tener un campo de texto que al escribir en \u00e9l aparecen sugerencias (en el caso de que existan) para auto completar su valor. Para el aspecto del mismo nos vamos a apoyar en la tecnolog\u00eda Bootstrap 4<\/strong>.<\/p>\n

Partiremos de un formulario simple en el cual tenemos un campo de texto (input) en el que aparecer\u00e1n sugerencias a medida que se va escribiendo.<\/p>\n

<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
<form<\/span><\/a> class<\/span>=<\/span>"form-inline"<\/span> method<\/span>=<\/span>"post"<\/span> action<\/span>=<\/span>"#"<\/span>><\/span>\n    <div<\/span><\/a> class<\/span>=<\/span>"input-group input-group-sm"<\/span>><\/span>\n        <input<\/span><\/a> class<\/span>=<\/span>"search_query form-control"<\/span> type<\/span>=<\/span>"text"<\/span> name<\/span>=<\/span>"key"<\/span> id<\/span>=<\/span>"key"<\/span> placeholder=<\/span>"Buscar..."<\/span>><\/span>\n        <span<\/span><\/a> class<\/span>=<\/span>"input-group-btn"<\/span>><\/span>\n            <button<\/span><\/a> type<\/span>=<\/span>"submit"<\/span> class<\/span>=<\/span>"btn btn-info btn-flat"<\/span>><i<\/span><\/a> class<\/span>=<\/span>"fa fa-search"<\/span>><\/<\/span>i<\/span><\/a>><\/<\/span>button<\/span><\/a>><\/span>\n        <\/<\/span>span<\/span><\/a>><\/span>\n    <\/<\/span>div<\/span><\/a>><\/span>\n<\/<\/span>form<\/span><\/a>><\/span>\n<div<\/span><\/a> id<\/span>=<\/span>"suggestions"<\/span>><\/<\/span>div<\/span><\/a>><\/span><\/pre><\/div><\/div>\n
De este formulario, tenemos que prestar especial atenci\u00f3n al id del input y al contenedor donde depositaremos mediante jQuery<\/strong> las sugerencias.<\/p>\n
En la cabecera o dentro de la etiqueta <head> o en una hoja de estilos podemos agregar el c\u00f3digo CSS<\/strong> espec\u00edfico que estamos usando para las sugerencias:<\/p>\n
<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
#suggestions<\/span> {<\/span>\n    box-shadow:<\/span> 2px<\/span> 2px<\/span> 8px<\/span> 0 rgba(<\/span>0,<\/span>0,<\/span>0,<\/span>.2)<\/span>;<\/span>\n    height<\/span>:<\/span> auto<\/span>;<\/span>\n    position<\/span>:<\/span> absolute<\/span>;<\/span>\n    top<\/span>:<\/span> 45px<\/span>;<\/span>\n    z-index<\/span>:<\/span> 9999<\/span>;<\/span>\n    width<\/span>:<\/span> 206px<\/span>;<\/span>\n}<\/span>\n \n#suggestions<\/span> .suggest-element<\/span> {<\/span>\n    background-color<\/span>:<\/span> #EEEEEE<\/span>;<\/span>\n    border-top<\/span>:<\/span> 1px<\/span> solid<\/span> #d6d4d4<\/span>;<\/span>\n    cursor<\/span>:<\/span> pointer<\/span>;<\/span>\n    padding<\/span>:<\/span> 8px<\/span>;<\/span>\n    width<\/span>:<\/span> 100<\/span>%<\/span>;<\/span>\n    float<\/span>:<\/span> left<\/span>;<\/span>\n}<\/span><\/pre><\/div><\/div>\n
Tambi\u00e9n en la cabecera o dentro de la etiqueta <head> o incluso justo antes de la etiqueta de cierre de <\/body> podemos agregar lo siguiente:<\/p>\n
<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
<<\/span>script src=<\/span>"https:\/\/code.jquery.com\/jquery-3.2.1.js"<\/span>><\/<\/span>script><\/span>\n<<\/span>script><\/span>\n$(<\/span>document)<\/span>.ready<\/span>(<\/span>function<\/span>(<\/span>)<\/span> {<\/span>\n    $(<\/span>'#key'<\/span>)<\/span>.on<\/span>(<\/span>'keyup'<\/span>,<\/span> function<\/span>(<\/span>)<\/span> {<\/span>\n        var<\/span> key =<\/span> $(<\/span>this<\/span>)<\/span>.val<\/span>(<\/span>)<\/span>;<\/span>\t\t\n        var<\/span> dataString =<\/span> 'key='<\/span>+<\/span>key;<\/span>\n\t$.ajax<\/span>(<\/span>{<\/span>\n            type:<\/span> "POST"<\/span>,<\/span>\n            url:<\/span> "ajax.php"<\/span>,<\/span>\n            data:<\/span> dataString,<\/span>\n            success:<\/span> function<\/span>(<\/span>data)<\/span> {<\/span>\n                \/\/Escribimos las sugerencias que nos manda la consulta<\/span>\n                $(<\/span>'#suggestions'<\/span>)<\/span>.fadeIn<\/span>(<\/span>1000)<\/span>.html<\/span>(<\/span>data)<\/span>;<\/span>\n                \/\/Al hacer click en alguna de las sugerencias<\/span>\n                $(<\/span>'.suggest-element'<\/span>)<\/span>.on<\/span>(<\/span>'click'<\/span>,<\/span> function<\/span>(<\/span>)<\/span>{<\/span>\n                        \/\/Obtenemos la id unica de la sugerencia pulsada<\/span>\n                        var<\/span> id =<\/span> $(<\/span>this<\/span>)<\/span>.attr<\/span>(<\/span>'id'<\/span>)<\/span>;<\/span>\n                        \/\/Editamos el valor del input con data de la sugerencia pulsada<\/span>\n                        $(<\/span>'#key'<\/span>)<\/span>.val<\/span>(<\/span>$(<\/span>'#'<\/span>+<\/span>id)<\/span>.attr<\/span>(<\/span>'data'<\/span>)<\/span>)<\/span>;<\/span>\n                        \/\/Hacemos desaparecer el resto de sugerencias<\/span>\n                        $(<\/span>'#suggestions'<\/span>)<\/span>.fadeOut<\/span>(<\/span>1000)<\/span>;<\/span>\n                        alert<\/span>(<\/span>'Has seleccionado el '<\/span>+<\/span>id+<\/span>' '<\/span>+<\/span>$(<\/span>'#'<\/span>+<\/span>id)<\/span>.attr<\/span>(<\/span>'data'<\/span>)<\/span>)<\/span>;<\/span>\n                        return<\/span> false<\/span>;<\/span>\n                }<\/span>)<\/span>;<\/span>\n            }<\/span>\n        }<\/span>)<\/span>;<\/span>\n    }<\/span>)<\/span>;<\/span>\n}<\/span>)<\/span>;<\/span> \n<\/<\/span>script><\/span><\/pre><\/div><\/div>\n
Ahora la p\u00e1gina estar\u00e1 a la espera observando que se escribe en el campo con id=\u00bbkey\u00bb para mostrar sugerencias.<\/p>\n
Utilizamos la funci\u00f3n keyup<\/em> de jQuery<\/strong> para capturar los eventos del teclado en este campo. Obtenemos el valor del input y se lo pasamos al archivo \u00abajax.php\u00bb mediante la t\u00e9cnica Ajax<\/strong>. La parte m\u00e1s interesante est\u00e1 en el success, observa los comentarios para entenderlo.<\/p>\n
Este archivo PHP<\/strong> se encarga de conectar con la base de datos y generar la consulta SQL<\/strong> para obtener los productos que contengan parte de los caracteres introducidos en el campo de texto.<\/p>\n
<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
<?php<\/span>\ndefine<\/span><\/a>(<\/span>'DB_SERVER'<\/span>,<\/span> 'localhost'<\/span>)<\/span>;<\/span>\ndefine<\/span><\/a>(<\/span>'DB_SERVER_USERNAME'<\/span>,<\/span> 'YOUR DATA BASE USERNAME'<\/span>)<\/span>;<\/span>\ndefine<\/span><\/a>(<\/span>'DB_SERVER_PASSWORD'<\/span>,<\/span> 'YOUR DATA BASE PASSWORD'<\/span>)<\/span>;<\/span>\ndefine<\/span><\/a>(<\/span>'DB_DATABASE'<\/span>,<\/span> 'YOUR DATA BASE NAME'<\/span>)<\/span>;<\/span>\n \n$connexion<\/span> =<\/span> new<\/span> mysqli(<\/span>DB_SERVER,<\/span> DB_SERVER_USERNAME,<\/span> DB_SERVER_PASSWORD,<\/span> DB_DATABASE)<\/span>;<\/span>\n \n$html<\/span> =<\/span> ''<\/span>;<\/span>\n$key<\/span> =<\/span> $_POST<\/span>[<\/span>'key'<\/span>]<\/span>;<\/span>\n \n$result<\/span> =<\/span> $connexion<\/span>-><\/span>query<\/span>(<\/span>\n    'SELECT * FROM product p \n    LEFT JOIN product_lang pl ON (pl.id_product = p.id_product AND pl.id_lang = 1) \n    WHERE active = 1 \n    AND pl.name LIKE "%'<\/span>.<\/span>strip_tags<\/span><\/a>(<\/span>$key<\/span>)<\/span>.<\/span>'%"\n    ORDER BY date_upd DESC LIMIT 0,5'<\/span>\n)<\/span>;<\/span>\nif<\/span> (<\/span>$result<\/span>-><\/span>num_rows<\/span> ><\/span> 0)<\/span> {<\/span>\n    while<\/span> (<\/span>$row<\/span> =<\/span> $result<\/span>-><\/span>fetch_assoc<\/span>(<\/span>)<\/span>)<\/span> {<\/span>                \n        $html<\/span> .=<\/span> '<div><a class="suggest-element" data="'<\/span>.<\/span>utf8_encode<\/span><\/a>(<\/span>$row<\/span>[<\/span>'name'<\/span>]<\/span>)<\/span>.<\/span>'" id="product'<\/span>.<\/span>$row<\/span>[<\/span>'id_product'<\/span>]<\/span>.<\/span>'">'<\/span>.<\/span>utf8_encode<\/span><\/a>(<\/span>$row<\/span>[<\/span>'name'<\/span>]<\/span>)<\/span>.<\/span>'<\/a><\/div>'<\/span>;<\/span>\n    }<\/span>\n}<\/span>\necho<\/span> $html<\/span>;<\/span>\n?><\/span><\/pre><\/div><\/div>\n
En este c\u00f3digo PHP<\/strong> lo que estamos haciendo es conectar con la base de datos, recoger el texto escrito en el campo de texto y hacer la consulta para buscar la informaci\u00f3n en las tablas que queremos de la base de datos. Este archivo retorna en formato HTML<\/strong> la lista de productos sugeridos.<\/p>\n
(*) Nota: Si te has descargado la demo deber\u00e1s cambiar los par\u00e1metros de conexi\u00f3n establecidos en el archivo \u00abajax.php\u00bb y luego realizar la consulta seg\u00fan sea la base de datos que desees emplear.<\/p>\n
En el ejemplo que estamos ilustrando jugamos con una base de datos de ejemplo en la que mostramos servicios o productos.<\/p>\n
<\/i> Ver demo<\/a> <\/i> Descargar<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Amplia tu conocimiento y obt\u00e9n un c\u00f3digo de ejemplo que te permite autocompletar un campo de texto con jQuery, Ajax y PHP. En el ejemplo en funcionamiento vamos a tener un campo de texto que al escribir en \u00e9l aparecen sugerencias (en el caso de que existan) para auto completar su valor. Para el aspecto […]<\/p>\n","protected":false},"author":1,"featured_media":7284,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31,149,5,3],"tags":[97,68,79],"class_list":["post-2406","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ajax","category-destacados","category-jquery","category-php","tag-autocomplete","tag-buscadores","tag-inputs"],"yoast_head":"\nAutocompletar campo con jQuery, Ajax y PHP - Jose Aguilar Blog<\/title>\n<meta name=\"description\" content=\"Tutorial y c\u00f3digo de ejemplo que te permite agregar a tu p\u00e1gina Web un campo de texto que al escribir en \u00e9l aparece un listado para autocompletar.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Autocompletar campo con jQuery, Ajax y PHP - 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