{"id":322,"date":"2012-03-23T13:21:21","date_gmt":"2012-03-23T12:21:21","guid":{"rendered":"http:\/\/vermiip.es\/blog\/?p=322"},"modified":"2017-10-26T18:14:52","modified_gmt":"2017-10-26T16:14:52","slug":"ver-el-valor-de-un-radio-button-en-un-formulario-html-en-javascript","status":"publish","type":"post","link":"https:\/\/vermiip.es\/blog\/ver-el-valor-de-un-radio-button-en-un-formulario-html-en-javascript\/","title":{"rendered":"Ver el valor de un \u00abRadio Button\u00bb en un formulario html en javascript"},"content":{"rendered":"

Para conocer el valor de un radio button por javascript debemos utilizar document.NOMBRE_FORMULARIO.NOMBRE_CAMPO[posici\u00f3n].value<\/strong><\/p>\n

Veamos un ejemplo para aclarar un poco como funciona. Dentro de una p\u00e1gina html tenemos un formulario con varios radio buttons para valorar la calidad de un p\u00e1gina:
\n[HTML]
\n<from name=\u00bbformu\u00bb>
\ntype=\u00bbradio\u00bb name=\u00bbvalora\u00bb value=\u00bbmala\u00bb \/>Mala<\/p>\n

type=\u00bbradio\u00bb name=\u00bbvalora\u00bb value=\u00bbregular\u00bb \/>Regular<\/p>\n

type=\u00bbradio\u00bb name=\u00bbvalora\u00bb value=\u00bbbuena\u00bb \/>Buena<\/p>\n

type=\u00bbradio\u00bb name=\u00bbvalora\u00bb value=\u00bbmuy buena\u00bb \/>Muy buena
\n<\/form>
\n[\/HTML]<\/p>\n

Para saber si uno de los elementos que conforman el grupo de radio buttons de nombre \u00abvalora\u00bb est\u00e1 selecionado utilizar\u00edamos:<\/p>\n

[JAVASCRIPT]
\nif(document.formu.valora[0].checked){
\nalert(\u00abEl primer valor est\u00e1 seleccionado\u00bb); \/\/en nuestro caso \u00abMala\u00bb
\n}
\n[\/JAVASCRIPT]<\/p>\n

Como habr\u00e9is visto, el primer elemento es 0 y no 1. Ahora lo que podemos hacer es recorrernos todas las opciones hasta dar con la que est\u00e9 marcada de esta manera:<\/p>\n

[JAVASCRIPT]
\nfor(i=0;i<document.formu.valora.length;i++){
\nif(document.formu.valora[i].checked) {
\nmarcado=i;
\n}
\n}
\nalert(\u00abEl valor seleccionado es: \u00ab+document.formu.valora[marcado].value);
\n[\/JAVASCRIPT]<\/p>\n

*** ACTUALIZACI\u00d3N ***<\/p>\n

Gracias a Ra\u00fal, que me ha avisado que si s\u00f3lo hay un radio button el script no devuelve el valor seleccionado, he ampliado el script anterior para que contemple esa posibilidad:<\/p>\n

[JAVASCRIPT]<\/p>\n

marcado=-1
\nif(document.formu.valora.length){
\nfor(i=0;i<document.formu.valora.length;i++){
\nif(document.formu.valora[i].checked) {
\nmarcado=i;
\n}
\n}
\nif(marcado!=-1)\u00a0\u00a0 \u00a0alert(\u00abEl valor seleccionado es: \u00ab+document.formu.valora[marcado].value);
\n}else{
\nif(document.formu.valora.checked){
\nalert(\u00abEl valor seleccionado es: \u00ab+document.formu.valora.value);
\n}
\n}<\/p>\n

[\/JAVASCRIPT]<\/p>\n","protected":false},"excerpt":{"rendered":"

Para conocer el valor de un radio button por javascript debemos utilizar document.NOMBRE_FORMULARIO.NOMBRE_CAMPO[posici\u00f3n].value
\nVeamos un ejemplo para aclarar un poco como funciona. Dentro de una p\u00e1gina html tenemos un formulario con varios radio buttons para valorar la calidad de un p\u00e1gina:<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86,41],"tags":[15,50,51],"class_list":["post-322","post","type-post","status-publish","format-standard","hentry","category-javascript","category-programacion","tag-javascript","tag-radio-button","tag-value"],"_wp_attached_file":null,"_wp_attachment_metadata":null,"_wp_old_slug":null,"_aioseop_description":"Para conocer el valor de un radio button por javascript debemos utilizar document.NOMBRE_FORMULARIO.NOMBRE_CAMPO[posici\u00f3n].value\r\nVeamos un ejemplo para aclarar un poco como funciona. Dentro de una p\u00e1gina html tenemos un formulario con varios radio buttons para valorar la calidad de un p\u00e1gina:","_wp_attachment_image_alt":null,"yoast_head":"\nVer el valor de un "Radio Button" en un formulario html en javascript - Ver mi IP<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/vermiip.es\/blog\/ver-el-valor-de-un-radio-button-en-un-formulario-html-en-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ver el valor de un "Radio Button" en un formulario html en javascript - Ver mi IP\" \/>\n<meta property=\"og:description\" content=\"Para conocer el valor de un radio button por javascript debemos utilizar document.NOMBRE_FORMULARIO.NOMBRE_CAMPO[posici\u00f3n].value Veamos un ejemplo para aclarar un poco como funciona. 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