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POEnabling/Disabling a button after database query
 

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    <p>I want to disable or enable a button, depending on the result of a database-query. But I don't know how. From an example, I managed to show a text (id="error", depending on the result of the query, but enabling the button (id="generate") does not work. </p> <p>This is my JavaScript:</p> <pre><code>function checkSender(str) { if(str == "") { str=document.getElementById("senderinput").value; } str=str.toUpperCase(); if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200) { document.getElementById("error").innerHTML=xmlhttp.responseText; if(xmlhttp.responseText == "Einsender existiert nicht.") { document.getElementById("generate").disabled = true; } else { document.getElementById("generate").disabled = false; } } } xmlhttp.open("GET","checkSender.php?s="+str,true); xmlhttp.send(); } </code></pre> <p>The response from checkSender.php is either "Einsender existiert nicht." or an empty string.</p> <p>Any suggestions?</p> <p><strong>EDIT</strong>:</p> <p>The PHP-Code:</p> <pre><code>&lt;?php require 'classes/DBHandler.php'; $DBHandler = new class_DBHandler(); $s = $_GET['s']; $query="&lt;Statement with $s as parameter&gt;"; $Data = $DBHandler-&gt;GetData($query); if(intval($Data[0]['COUNT']) &gt;= 1) { echo ""; } else { echo "Einsender existiert nicht."; } ?&gt; </code></pre> <p>The HTML-Code:</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="content-type" content="text/html; charset=UTF-8" /&gt; &lt;link rel="stylesheet" type="text/css" href="style.css"&gt; &lt;script src="inc/checkSender.js"&gt;&lt;/script&gt; &lt;title&gt;MarPro&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;div class="main"&gt; &lt;div class="debug" id="ana"&gt; &lt;/div&gt; &lt;div class="headline"&gt; &lt;h1&gt;MarPro&lt;/h1&gt; &lt;/div&gt; &lt;div class="result"&gt; &lt;div class="menu"&gt; &lt;form action="" method="post" name="senderform"&gt; &lt;p&gt;Einsender: &lt;input type="text" name="sender" onkeyup="checkSender(this.value)"&gt;&lt;/p&gt; &lt;p id="error"&gt;&lt;/p&gt; &lt;p&gt;&lt;input type="submit" name="generate" value="Generieren" id="generate" disabled&gt;&lt;/p&gt; &lt;/form&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Thanks in advance!</p> <p>Marco Frost</p>
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    1. COmake a fiddle of it please, your code looks fine, show us the html and php please
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    2. CODone it. Does it help you?
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    3. COWhat exactly do you mean by "fiddle"? I've posted the HTML- and PHP-Code in the Question.
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