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PO$_GET is not null and returns undefined id
 

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  1. PO$_GET is not null and returns undefined id
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    <p>i have being tried to do solve a problem with a undefined id but i can't. It says me that i have undefined id but if i don´t use "isset" the program runs really nice but i need the file outputs the information instead of the:</p> <pre><code>Notice: Undefined index: id in C:\xampp\htdocs\treeview_v2\load_url_db.php on line 17 Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\treeview_v2\load_url_db.php on line 23 Notice: Undefined variable: url in C:\xampp\htdocs\treeview_v2\load_url_db.php on line 27. </code></pre> <p>The file to load information is this:</p> <pre><code>&lt;?php include_once 'acess_db.php'; //echo $_GET['id']; //// // //if(isset($_GET['id'])) //{ // read_url(); //} //else //{ // echo 'erro...'; //} $a = $_GET['id']; echo $a; read_url($a); function read_url($id) { $rs = mysql_query("select url from dados3 where id=$id"); while($row = mysql_fetch_array($rs)) { $url = $row["url"]; } echo "&lt;iframe src=\"{$url}\" style=\"height=\"75%\" width=\"100%\"&gt;&lt;/iframe&gt;"; } ?&gt; </code></pre> <p>And the html code is like this:</p> <pre><code>&lt;?php include_once 'load_url_db.php';?&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;meta name="keywords" content="jquery,ui,easy,easyui,web"&gt; &lt;meta name="description" content="easyui help you build your web page easily!"&gt; &lt;title&gt;Async Tree - jQuery EasyUI Demo&lt;/title&gt; &lt;link rel="stylesheet" type="text/css" href="http://www.jeasyui.com/easyui/themes/default/easyui.css"&gt; &lt;link rel="stylesheet" type="text/css" href="http://www.jeasyui.com/easyui/themes/icon.css"&gt; &lt;link rel="stylesheet" type="text/css" href="http://www.jeasyui.com/easyui/demo/demo.css"&gt; &lt;script type="text/javascript" src="http://code.jquery.com/jquery-1.6.1.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="http://www.jeasyui.com/easyui/jquery.easyui.min.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div style="width: 300px; float: left;"&gt; &lt;ul id="tt" class="easyui-tree" url="get_tree_data_id.php" data-options="animate:true" &gt; &lt;/ul&gt; &lt;/div&gt; &lt;!-- A IFRAME CARREGA A SRC ATRAVES DO PHP--&gt; &lt;div&gt; &lt;iframe id="a" name="ifrm1" style="float: right; width: 80%; height: 100%; visibility: hidden;" src='load_url_db.php'&gt; &lt;/iframe&gt; &lt;button class="button" onClick="getIframeContent(a);"&gt;&lt;span class="icon"&gt;Open&lt;/span&gt;&lt;/button&gt; &lt;/div&gt; &lt;script language="Javascript" type="text/javascript"&gt; //TORNA A IFRAME VISIVEL $('#tt').tree({ onClick: function(){ console.log("Entrou na funçao.."); $("#a").css("visibility", "visible"); var node = $('#tt').tree('getSelected'); console.log("Selecionou o no.."); $("#a").attr('src', "load_url_db.php?id=" + node.id); console.log("ID do no selecionado: " + node.id); } }); &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>If anyone knows what is wrong and can help me i will appreciate.</p> <p>Best regards.</p>
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    1. USHarish Singh
    1. USJosé Ribeiro
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    1. COpossible duplicate of [PHP: "Notice: Undefined variable" and "Notice: Undefined index"](http://stackoverflow.com/questions/4261133/php-notice-undefined-variable-and-notice-undefined-index)
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      1. USÁlvaro González
    2. COare you getting proper value while echoing $a??
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      1. USSanal K
 

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