{"id":2351,"date":"2012-03-21T16:50:50","date_gmt":"2012-03-21T16:50:50","guid":{"rendered":"https:\/\/www.jose-aguilar.com\/blog\/?p=2351"},"modified":"2019-04-09T10:54:14","modified_gmt":"2019-04-09T10:54:14","slug":"combos-dependientes-con-jquery-ajax-y-php","status":"publish","type":"post","link":"https:\/\/www.jose-aguilar.com\/blog\/combos-dependientes-con-jquery-ajax-y-php\/","title":{"rendered":"Combos dependientes con jQuery, Ajax y PHP"},"content":{"rendered":"<p>Seguramente has visto en algunas p\u00e1ginas Webs los <strong>combos dependientes<\/strong> (<strong>selectores<\/strong>) que al seleccionar una opci\u00f3n en el primer combo, te aparecen las opciones relacionadas con este en un segundo combo.<\/p>\n<p>En muchas ocasiones nos vemos en la necesidad de usar estos\u00a0<strong>combos<\/strong> o <strong>selectores<\/strong> que se llenen seg\u00fan lo que elegimos en otro combo, como por ejemplo, si tenemos un selector de pa\u00edses y queremos que cuando se elija un pa\u00eds, en otro selector aparezcan las ciudades o estados del pa\u00eds elegido.<\/p>\n<p>Es posible que hayas visto muchos tutoriales y ejemplos sobre esto pero estos son muy dif\u00edciles de modificar para conseguir personalizarlo al m\u00e1ximo.<\/p>\n<p>En este art\u00edculo vamos a explicar una forma muy sencilla de conseguirlo y que puede servir para cualquier posibilidad y adem\u00e1s es muy sencillo de entender y modificar.<\/p>\n<p>Vamos a explicar un ejemplo en el cual vamos a tener marcas de coches anidando con algunas de sus modelos.<\/p>\n<p>En el cuerpo de la p\u00e1gina o dentro de la etiqueta &lt;body&gt; creamos el formulario con los 2 selectores de la siguiente forma:<\/p>\n<div id=\"wpshdo_1\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_1\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_1\"><\/a><a id=\"wpshat_1\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_1\"  onClick=\"javascript:wpsh_toggleBlock(1)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_1\" onClick=\"javascript:wpsh_code(1)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_1\" onClick=\"javascript:wpsh_print(1)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_1\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"html4strict\" style=\"font-family:monospace;\"><span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/form.html\"><span class=\"kw2\">form<\/span><\/a> <span class=\"kw3\">class<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;row&quot;<\/span> <span class=\"kw3\">action<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;&quot;<\/span> <span class=\"kw3\">method<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;post&quot;<\/span>&gt;<\/span>\n    <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/div.html\"><span class=\"kw2\">div<\/span><\/a> <span class=\"kw3\">class<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;form-group col-lg-3&quot;<\/span>&gt;<\/span>\n        <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/label.html\"><span class=\"kw2\">label<\/span><\/a> <span class=\"kw3\">for<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;marca&quot;<\/span>&gt;<\/span>Marca<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/label.html\"><span class=\"kw2\">label<\/span><\/a>&gt;<\/span>\n        <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/select.html\"><span class=\"kw2\">select<\/span><\/a> <span class=\"kw3\">name<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;marca&quot;<\/span> <span class=\"kw3\">id<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;marca&quot;<\/span> <span class=\"kw3\">class<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;form-control&quot;<\/span>&gt;<\/span>\n            <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a> <span class=\"kw3\">value<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;1&quot;<\/span>&gt;<\/span>Renault<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a>&gt;<\/span>\n            <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a> <span class=\"kw3\">value<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;2&quot;<\/span>&gt;<\/span>Seat<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a>&gt;<\/span>\n            <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a> <span class=\"kw3\">value<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;3&quot;<\/span>&gt;<\/span>Peugeot<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a>&gt;<\/span>\n        <span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/select.html\"><span class=\"kw2\">select<\/span><\/a>&gt;<\/span>\n    <span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/div.html\"><span class=\"kw2\">div<\/span><\/a>&gt;<\/span>\n    <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/div.html\"><span class=\"kw2\">div<\/span><\/a> <span class=\"kw3\">class<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;form-group col-lg-3&quot;<\/span>&gt;<\/span>\n        <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/label.html\"><span class=\"kw2\">label<\/span><\/a> <span class=\"kw3\">for<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;modelo&quot;<\/span>&gt;<\/span>Modelo<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/label.html\"><span class=\"kw2\">label<\/span><\/a>&gt;<\/span>\n        <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/select.html\"><span class=\"kw2\">select<\/span><\/a> <span class=\"kw3\">name<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;modelo&quot;<\/span> <span class=\"kw3\">id<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;modelo&quot;<\/span> <span class=\"kw3\">class<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;form-control&quot;<\/span>&gt;<\/span>\n            <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a> <span class=\"kw3\">value<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;1&quot;<\/span>&gt;<\/span>4<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a>&gt;<\/span>\n            <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a> <span class=\"kw3\">value<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;2&quot;<\/span>&gt;<\/span>5<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a>&gt;<\/span>\n            <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a> <span class=\"kw3\">value<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;3&quot;<\/span>&gt;<\/span>7<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a>&gt;<\/span>\n            <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a> <span class=\"kw3\">value<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;4&quot;<\/span>&gt;<\/span>21<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a>&gt;<\/span>\n            <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a> <span class=\"kw3\">value<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;5&quot;<\/span>&gt;<\/span>Scennic<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a>&gt;<\/span>\n            <span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a> <span class=\"kw3\">value<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;6&quot;<\/span>&gt;<\/span>Traffic<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/option.html\"><span class=\"kw2\">option<\/span><\/a>&gt;<\/span>\n        <span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/select.html\"><span class=\"kw2\">select<\/span><\/a>&gt;<\/span>\n    <span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/div.html\"><span class=\"kw2\">div<\/span><\/a>&gt;<\/span>\n<span class=\"sc2\">&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/form.html\"><span class=\"kw2\">form<\/span><\/a>&gt;<\/span><\/pre><\/div><\/div>\n<p>Tenemos un selector inicial donde el usuario puede elegir la marca y un segundo selector donde el usuario puede elegir el modelo.<\/p>\n<p>En la cabecera de la p\u00e1gina o dentro de la etiqueta &lt;head&gt; se debe incluir la librer\u00eda jQuery y el script de la llamada al evento:<\/p>\n<div id=\"wpshdo_2\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_2\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_2\"><\/a><a id=\"wpshat_2\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_2\"  onClick=\"javascript:wpsh_toggleBlock(2)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_2\" onClick=\"javascript:wpsh_code(2)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_2\" onClick=\"javascript:wpsh_print(2)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_2\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">&lt;script src=&quot;https:\/\/code.jquery.com\/jquery-3.2.1.js&quot;&gt;&lt;\/script&gt;\n<span class=\"sy0\">&lt;<\/span>script language<span class=\"sy0\">=<\/span><span class=\"st0\">&quot;javascript&quot;<\/span><span class=\"sy0\">&gt;<\/span>\n$<span class=\"br0\">&#40;<\/span>document<span class=\"br0\">&#41;<\/span>.<span class=\"me1\">ready<\/span><span class=\"br0\">&#40;<\/span><span class=\"kw2\">function<\/span><span class=\"br0\">&#40;<\/span><span class=\"br0\">&#41;<\/span><span class=\"br0\">&#123;<\/span>\n    $<span class=\"br0\">&#40;<\/span><span class=\"st0\">&quot;#marca&quot;<\/span><span class=\"br0\">&#41;<\/span>.<span class=\"me1\">on<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">'change'<\/span><span class=\"sy0\">,<\/span> <span class=\"kw2\">function<\/span> <span class=\"br0\">&#40;<\/span><span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n        $<span class=\"br0\">&#40;<\/span><span class=\"st0\">&quot;#marca option:selected&quot;<\/span><span class=\"br0\">&#41;<\/span>.<span class=\"me1\">each<\/span><span class=\"br0\">&#40;<\/span><span class=\"kw2\">function<\/span> <span class=\"br0\">&#40;<\/span><span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n            elegido<span class=\"sy0\">=<\/span>$<span class=\"br0\">&#40;<\/span><span class=\"kw1\">this<\/span><span class=\"br0\">&#41;<\/span>.<span class=\"me1\">val<\/span><span class=\"br0\">&#40;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n            $.<span class=\"me1\">post<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">&quot;modelos.php&quot;<\/span><span class=\"sy0\">,<\/span> <span class=\"br0\">&#123;<\/span> elegido<span class=\"sy0\">:<\/span> elegido <span class=\"br0\">&#125;<\/span><span class=\"sy0\">,<\/span> <span class=\"kw2\">function<\/span><span class=\"br0\">&#40;<\/span>data<span class=\"br0\">&#41;<\/span><span class=\"br0\">&#123;<\/span>\n                $<span class=\"br0\">&#40;<\/span><span class=\"st0\">&quot;#modelo&quot;<\/span><span class=\"br0\">&#41;<\/span>.<span class=\"me1\">html<\/span><span class=\"br0\">&#40;<\/span>data<span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n            <span class=\"br0\">&#125;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\t\t\t\n        <span class=\"br0\">&#125;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n   <span class=\"br0\">&#125;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n<span class=\"br0\">&#125;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n<span class=\"sy0\">&lt;\/<\/span>script<span class=\"sy0\">&gt;<\/span><\/pre><\/div><\/div>\n<p>El c\u00f3digo de la llamada al evento se encarga de esperar a que el selector con identificador \u00abmarca\u00bb sea cambiado para rellenar el segundo selector con los modelos mediante una llamada <strong>Ajax<\/strong>.<\/p>\n<p>En este archivo \u00abmodelos.php\u00bb tan solo hacemos lo siguiente:<\/p>\n<div id=\"wpshdo_3\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_3\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_3\"><\/a><a id=\"wpshat_3\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_3\"  onClick=\"javascript:wpsh_toggleBlock(3)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_3\" onClick=\"javascript:wpsh_code(3)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_3\" onClick=\"javascript:wpsh_print(3)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_3\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"php\" style=\"font-family:monospace;\"><span class=\"kw2\">&lt;?php<\/span>\n<span class=\"re0\">$html<\/span> <span class=\"sy0\">=<\/span> <span class=\"st0\">&quot;&quot;<\/span><span class=\"sy0\">;<\/span>\n<span class=\"kw1\">if<\/span> <span class=\"br0\">&#40;<\/span><span class=\"re0\">$_POST<\/span><span class=\"br0\">[<\/span><span class=\"st0\">&quot;elegido&quot;<\/span><span class=\"br0\">]<\/span><span class=\"sy0\">==<\/span>1<span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n\t<span class=\"re0\">$html<\/span> <span class=\"sy0\">=<\/span> <span class=\"st_h\">'\n\t&lt;option value=&quot;1&quot;&gt;4&lt;\/option&gt;\n\t&lt;option value=&quot;2&quot;&gt;5&lt;\/option&gt;\n\t&lt;option value=&quot;3&quot;&gt;7&lt;\/option&gt;\n\t&lt;option value=&quot;4&quot;&gt;21&lt;\/option&gt;\n\t&lt;option value=&quot;5&quot;&gt;Scennic&lt;\/option&gt;\n\t&lt;option value=&quot;6&quot;&gt;Traffic&lt;\/option&gt;\n\t'<\/span><span class=\"sy0\">;<\/span>\t\n<span class=\"br0\">&#125;<\/span>\n<span class=\"kw1\">if<\/span> <span class=\"br0\">&#40;<\/span><span class=\"re0\">$_POST<\/span><span class=\"br0\">[<\/span><span class=\"st0\">&quot;elegido&quot;<\/span><span class=\"br0\">]<\/span><span class=\"sy0\">==<\/span>2<span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n\t<span class=\"re0\">$html<\/span> <span class=\"sy0\">=<\/span> <span class=\"st_h\">'\n\t&lt;option value=&quot;1&quot;&gt;Ibiza&lt;\/option&gt;\n\t&lt;option value=&quot;2&quot;&gt;Toledo&lt;\/option&gt;\n\t&lt;option value=&quot;3&quot;&gt;Cordoba&lt;\/option&gt;\n\t&lt;option value=&quot;4&quot;&gt;Arosa&lt;\/option&gt;\n\t'<\/span><span class=\"sy0\">;<\/span>\t\n<span class=\"br0\">&#125;<\/span>\n<span class=\"kw1\">if<\/span> <span class=\"br0\">&#40;<\/span><span class=\"re0\">$_POST<\/span><span class=\"br0\">[<\/span><span class=\"st0\">&quot;elegido&quot;<\/span><span class=\"br0\">]<\/span><span class=\"sy0\">==<\/span>3<span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n\t<span class=\"re0\">$html<\/span> <span class=\"sy0\">=<\/span> <span class=\"st_h\">'\n\t&lt;option value=&quot;1&quot;&gt;106&lt;\/option&gt;\n\t&lt;option value=&quot;2&quot;&gt;206&lt;\/option&gt;\n\t&lt;option value=&quot;3&quot;&gt;306&lt;\/option&gt;\n\t'<\/span><span class=\"sy0\">;<\/span>\t\n<span class=\"br0\">&#125;<\/span>\n<span class=\"kw1\">echo<\/span> <span class=\"re0\">$html<\/span><span class=\"sy0\">;<\/span>\t\n<span class=\"sy1\">?&gt;<\/span><\/pre><\/div><\/div>\n<p>Seg\u00fan la marca elegida retornar\u00e1 unas opciones u otras. Las opciones que retorna el archivo \u00abmodelos.php\u00bb se establecen en el selector con identificador \u00abmodelo\u00bb.<\/p>\n<p>La clave del asunto es la llamada mediante <strong>AJAX<\/strong> al archivo \u00abmodelos.php\u00bb que tiene una lista de las opciones de las diferentes marcas y se retorna aquella lista de opciones que represente o sean de la marca escogida.<\/p>\n<p>Como vemos tenemos 2 combos abiertos o a la vista por defecto. Al cambiar la marca, din\u00e1micamente cambian los modelos gracias al c\u00f3digo <strong>jQuery<\/strong>, <strong>Ajax<\/strong> y al archivo \u00abmodelos.php\u00bb que se encarga de retornar la lista de opciones que toca.<\/p>\n<p style=\"text-align: center;\"><a class=\"btn btn-primary\" href=\"https:\/\/www.jose-aguilar.com\/scripts\/jquery\/combos-dependientes\/coches.html\" target=\"_blank\" rel=\"noopener noreferrer\"><i class=\"fa fa-eye\"><\/i> Ver el ejemplo de las marcas y modelos<\/a><\/p>\n<p style=\"text-align: center;\"><a class=\"btn btn-primary\" href=\"https:\/\/www.jose-aguilar.com\/scripts\/jquery\/combos-dependientes\/cursos.html\" target=\"_blank\" rel=\"noopener noreferrer\"><i class=\"fa fa-eye\"><\/i> Ver el ejemplo de los niveles y cursos<\/a><\/p>\n<p style=\"text-align: center;\"><a class=\"btn btn-primary\" href=\"https:\/\/www.jose-aguilar.com\/scripts\/jquery\/combos-dependientes\/categories.php\" target=\"_blank\" rel=\"noopener noreferrer\"><i class=\"fa fa-eye\"><\/i> Ver ejemplo con categor\u00edas y subcategor\u00edas en base de datos<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00f3digo de ejemplo que te permite a\u00f1adir combos dependientes (selects). Al seleccionar una opci\u00f3n en el primero, aparecen sus opciones en el segundo combo.<\/p>\n","protected":false},"author":1,"featured_media":7265,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31,5,3],"tags":[62],"class_list":["post-2351","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ajax","category-jquery","category-php","tag-selects"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Combos dependientes con jQuery, Ajax y PHP - Jose Aguilar Blog<\/title>\n<meta name=\"description\" content=\"C\u00f3digo de ejemplo que te permite a\u00f1adir combos dependientes (selects). Al seleccionar una opci\u00f3n en el primero, aparecen sus opciones en el segundo combo.\" \/>\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=\"Combos dependientes con jQuery, Ajax y PHP - Jose Aguilar Blog\" \/>\n<meta property=\"og:description\" content=\"C\u00f3digo de ejemplo que te permite a\u00f1adir combos dependientes (selects). Al seleccionar una opci\u00f3n en el primero, aparecen sus opciones en el segundo combo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.jose-aguilar.com\/blog\/combos-dependientes-con-jquery-ajax-y-php\/\" \/>\n<meta property=\"og:site_name\" content=\"Jose Aguilar Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/joseaguilarblog\" \/>\n<meta property=\"article:published_time\" content=\"2012-03-21T16:50:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-04-09T10:54:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/uploads\/2012\/03\/combos-dependientes-con-jquery.png\" \/>\n\t<meta property=\"og:image:width\" content=\"250\" \/>\n\t<meta property=\"og:image:height\" content=\"250\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Jose Aguilar\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@JoseAguilarBlog\" \/>\n<meta name=\"twitter:site\" content=\"@JoseAguilarBlog\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jose Aguilar\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.jose-aguilar.com\/blog\/combos-dependientes-con-jquery-ajax-y-php\/\",\"url\":\"https:\/\/www.jose-aguilar.com\/blog\/combos-dependientes-con-jquery-ajax-y-php\/\",\"name\":\"Combos dependientes con jQuery, Ajax y PHP - Jose Aguilar Blog\",\"isPartOf\":{\"@id\":\"https:\/\/www.jose-aguilar.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.jose-aguilar.com\/blog\/combos-dependientes-con-jquery-ajax-y-php\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.jose-aguilar.com\/blog\/combos-dependientes-con-jquery-ajax-y-php\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/uploads\/2012\/03\/combos-dependientes-con-jquery.png\",\"datePublished\":\"2012-03-21T16:50:50+00:00\",\"dateModified\":\"2019-04-09T10:54:14+00:00\",\"author\":{\"@id\":\"https:\/\/www.jose-aguilar.com\/blog\/#\/schema\/person\/e6d485db1e1140866e95971d17105d11\"},\"description\":\"C\u00f3digo de ejemplo que te permite a\u00f1adir combos dependientes (selects). 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