{"id":5838,"date":"2013-02-20T14:25:52","date_gmt":"2013-02-20T14:25:52","guid":{"rendered":"https:\/\/www.jose-aguilar.com\/blog\/?p=5838"},"modified":"2019-06-14T10:29:22","modified_gmt":"2019-06-14T10:29:22","slug":"seleccionar-una-opcion-por-defecto-de-un-select-con-jquery","status":"publish","type":"post","link":"https:\/\/www.jose-aguilar.com\/blog\/seleccionar-una-opcion-por-defecto-de-un-select-con-jquery\/","title":{"rendered":"Seleccionar una opci\u00f3n por defecto de un select con jQuery"},"content":{"rendered":"

En este art\u00edculo vamos a ver una l\u00ednea de c\u00f3digo interesante que nos podr\u00eda resultar de gran utilidad cuando queremos seleccionar por defecto una opci\u00f3n de un dropdown, selector de opciones o lista desplegable<\/strong> con jQuery<\/strong>.<\/p>\n

Bien es cierto que puedes pensar que ser\u00eda mucho m\u00e1s sencillo establecer el atributo \u00abselected\u00bb directamente en la opci\u00f3n que deseemos del selector de la siguiente forma y listo:<\/p>\n

<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
<option<\/span><\/a> value<\/span>=<\/span>"3"<\/span> selected<\/span>=<\/span>"selected"<\/span>><\/span>Espa\u00f1a<\/<\/span>option<\/span><\/a>><\/span><\/pre><\/div><\/div>\n
No es el caso que queremos ilustrar. De esta forma ser\u00eda muy sencillo pero, en algunos casos o situaciones no resulta posible hacer esto y una buena soluci\u00f3n que te puede sacar de un apuro es utilizar jQuery<\/strong> para indicar o seleccionar una opci\u00f3n por defecto de un selector<\/strong>.<\/p>\n
En el ejemplo que tenemos en funcionamiento tenemos una lista desplegable de pa\u00edses donde vamos a dejar marcado por defecto la opci\u00f3n de \u00abEspa\u00f1a\u00bb utilizando jQuery<\/strong>.<\/p>\n
En la cabecera de la p\u00e1gina o dentro de la etiqueta <head> agregaremos la librer\u00eda jQuery<\/strong> y el c\u00f3digo que permite realizar la selecci\u00f3n de una opci\u00f3n por defecto. Tan solo es una linea de c\u00f3digo.<\/p>\n
<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
<script src="https:\/\/code.jquery.com\/jquery-3.2.1.js"><\/script>\n<<\/span>script type=<\/span>"text\/javascript"<\/span>><\/span>\n$(<\/span>document)<\/span>.ready<\/span>(<\/span>function<\/span>(<\/span>)<\/span>{<\/span>\n    $(<\/span>'#id_country > option[value="3"]'<\/span>)<\/span>.attr<\/span>(<\/span>'selected'<\/span>,<\/span> 'selected'<\/span>)<\/span>;<\/span>\n}<\/span>)<\/span>;<\/span>\n<\/<\/span>script><\/span><\/pre><\/div><\/div>\n
El selector de pa\u00edses lo tenemos dentro de un formulario en alguna parte del cuerpo o etiqueta <body> de la p\u00e1gina:<\/p>\n
<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
<form<\/span><\/a> method<\/span>=<\/span>"post"<\/span> class<\/span>=<\/span>"row"<\/span>><\/span>\n    <div<\/span><\/a> class<\/span>=<\/span>"form-group col-lg-6"<\/span>><\/span>\n        <label<\/span><\/a>><\/span>Pa\u00eds<\/<\/span>label<\/span><\/a>><\/span>\n        <select<\/span><\/a> name<\/span>=<\/span>"id_country"<\/span> id<\/span>=<\/span>"id_country"<\/span> class<\/span>=<\/span>"form-control"<\/span>><\/span>\n            <option<\/span><\/a> value<\/span>=<\/span>"1"<\/span>><\/span>Alemania<\/<\/span>option<\/span><\/a>><\/span>\n            <option<\/span><\/a> value<\/span>=<\/span>"2"<\/span>><\/span>Francia<\/<\/span>option<\/span><\/a>><\/span>\n            <option<\/span><\/a> value<\/span>=<\/span>"3"<\/span>><\/span>Espa\u00f1a<\/<\/span>option<\/span><\/a>><\/span>\n            <option<\/span><\/a> value<\/span>=<\/span>"4"<\/span>><\/span>Inglaterra<\/<\/span>option<\/span><\/a>><\/span>\n            <option<\/span><\/a> value<\/span>=<\/span>"5"<\/span>><\/span>Portugal<\/<\/span>option<\/span><\/a>><\/span>\n            <option<\/span><\/a> value<\/span>=<\/span>"6"<\/span>><\/span>Italia<\/<\/span>option<\/span><\/a>><\/span>\n        <\/<\/span>select<\/span><\/a>><\/span>\n    <\/<\/span>div<\/span><\/a>><\/span>\n<\/<\/span>form<\/span><\/a>><\/span><\/pre><\/div><\/div>\n
Al cargar la p\u00e1gina del ejemplo podr\u00e1s observar que por defecto la opci\u00f3n con value=\u00bb3″ queda seleccionada que, en este caso particular, ser\u00eda Espa\u00f1a.<\/p>\n
<\/i> Ver demo<\/a> <\/i> Descargar<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Tutorial y c\u00f3digo de ejemplo que te permite seleccionar por defecto una opci\u00f3n de un select, dropdown, selector de opciones o lista desplegable con jQuery.<\/p>\n","protected":false},"author":1,"featured_media":7325,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[167,62],"class_list":["post-5838","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-jquery","tag-eventos","tag-selects"],"yoast_head":"\nSeleccionar una opci\u00f3n por defecto de un select con jQuery - Jose Aguilar Blog<\/title>\n<meta name=\"description\" content=\"Tutorial y c\u00f3digo de ejemplo que te permite seleccionar por defecto una opci\u00f3n de un select, dropdown, selector de opciones o lista desplegable con jQuery.\" \/>\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=\"Seleccionar una opci\u00f3n por defecto de un select con jQuery - 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