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POjQuery not loading data on a select
 

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  1. POjQuery not loading data on a select
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    <p>I have a main PHP page that uses jQuery to load the different pages for actions that the user can do.</p> <p><img src="https://i.stack.imgur.com/96zbK.png" alt="Main page"></p> <p>This is where the user do everything. It has an jQuery script that when you click an orange element <code>&lt;p&gt;</code>.</p> <p>When you click "Solicitar Software", jQuery loads "solicitudes.php". This php page has its own script.</p> <p><img src="https://i.stack.imgur.com/x78V4.png" alt="enter image description here"></p> <p>When "solicitudes.php" page loads, its PHP script runs. <pre><code>require('conexion.php'); $conexion = new connection(); $query = "SELECT * FROM Carreras"; $resultado = mysql_query($query, $conexion -&gt; conn) or die('ERROR:' .$query); ?&gt; </code></pre> <p>The script loads all the careers in the database and add add them to the <code>&lt;select&gt;</code> as you can see:</p> <p><img src="https://i.stack.imgur.com/DQCBt.png" alt="enter image description here"></p> <p>The problem is here, when I click on a carrer, it does not load the list subjects related to the career. But, if I access the PHP file alone, it works well.</p> <p><img src="https://i.stack.imgur.com/OzwfE.png" alt="enter image description here"></p> <p>Here is the jQuery code:</p> <pre><code>$(document).ready(function() { $("#carrera").change( //Select a carrer function() { var carreraId = $('#carrera option:selected').val(); var queryMaterias = "carreraid=" + carreraId + "&amp;valor=" + $("#valor").val(); jQuery.ajax({ url: 'acciones.php', type: 'GET', dataType: 'text', data: queryMaterias, success: function(data) { $("#lmateria").empty(); $("#lmateria").append(data); //Add subjects to the &lt;select&gt; // $("#lmateria").html(data); }, error: function(xhr, textStatus, errorThrown) { //called when there is an error alert(errorThrown); }, }); } ); }); </code></pre> <p>Am I doing something wrong? What may be the problem? Thanks for the help.</p> <p>Main page: </p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;meta charset="utf-8"&gt; &lt;title&gt;Sistema de Administración&lt;/title&gt; &lt;link rel="stylesheet" type="text/css" href="//necolas.github.com/normalize.css/2.1.0/normalize.css"&gt; &lt;link rel="stylesheet" type="text/css" href="css/administrador.css"&gt; &lt;script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="scripts/administrador.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="acciones"&gt; &lt;p id="logo"&gt; &lt;img src="images/logo1.jpg" alt="logo"&gt; &lt;/p&gt; &lt;p id="division"&gt;Agregar Division&lt;/p&gt; &lt;p id="carrera"&gt;Agregar Carrera&lt;/p&gt; &lt;p id="materia"&gt;Agregar Materia&lt;/p&gt; &lt;p id="software"&gt;Agregar Software&lt;/p&gt; &lt;p id="profesor"&gt;Agregar Profesor&lt;/p&gt; &lt;p id="ssoftware"&gt;Solicitar Software&lt;/p&gt; &lt;p id="solicitudes"&gt;Lista de Solicitudes&lt;/p&gt; &lt;center&gt;&lt;input type="button" id="logout" value="Salir" onclick="window.location.href='acciones.php?valor=5'"&gt;&lt;/center&gt; &lt;/div&gt; &lt;div id="resultado"&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>jQuery loads "solicitud.php" on the <code>&lt;div&gt; resultado</code>.</p> <p>Solicitud.php:</p> <pre><code>&lt;!doctype html&gt; &lt;?php require('conexion.php'); $conexion = new connection(); $query = "SELECT * FROM Carreras"; $resultado = mysql_query($query, $conexion -&gt; conn) or die('ERROR:' .$query); ?&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset="UTF-8"&gt; &lt;link rel="stylesheet" type="text/css" href="css/solicitud.css"&gt; &lt;script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="scripts/solicitud.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;header&gt; &lt;h2&gt;Solicitud de Software&lt;/h2&gt; &lt;/header&gt; &lt;form action="acciones.php" id="solicitud" method = "GET"&gt; &lt;select name="carrera" id="carrera"&gt; &lt;option value=""&gt;Seleccione una carrera&lt;/option&gt; &lt;?php while ($datos = mysql_fetch_assoc($resultado)) #MUESTRA LOS ROLES { ?&gt; &lt;option value="&lt;?php echo $datos['id'];?&gt;"&gt;&lt;?php echo utf8_encode($datos['Carrera']);?&gt;&lt;/option&gt; &lt;?php } ?&gt; &lt;/select&gt; &lt;select name="materias" id="lmateria"&gt; &lt;option value=""&gt;Potato&lt;/option&gt; &lt;/select&gt; &lt;!-- &lt;input type="text" placeholder="Nombre" id="nombre" name="nombre"&gt; &lt;input type="text" placeholder="Codigo" id="codigo" name="codigo"&gt; &lt;input type="button" value="Agregar" id="enviar"&gt; --&gt; &lt;input type="hidden" id="valor" name="valor" value='17'&gt; &lt;/form&gt; &lt;h3 id="exito"&gt;Agregado!&lt;/h3&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. COdo you have options in your response i.e data ??
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    2. COdata holds the response of the query. It is a string that contains the options: $return .= "<option value='$value'>$text</option>"; print $return; This is on the php file that does the query.
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    3. CONot all browsers like having the innerHTML of `select` elements changed in that way. Try creating a new `select` element with the new options in jQuery, then loop to transfer the options across to the existing `select` element on the page.
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