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POGetting Ajax to execute using PHP generated values
 

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  1. POGetting Ajax to execute using PHP generated values
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    <p>I'm completely new to AJAX, and am trying to use it to grab the details of sample users once said user is selected from a dropdown list generated via a php/mysql query. The process works fine when the dropdown values are hardcoded (<code>&lt;option vlaue="1"&gt;1&lt;/option&gt;, &lt;option vlaue="2"&gt;2&lt;/option&gt;, &lt;option value="3"&gt;3&lt;/option&gt;</code>, etc.), but nothing happens when I use the PHP version (snippet 2 below). I'm obviously missing out on some concept here, as I've Googled this every which way I can, as well as searched through Stackoverflow's archives, but can't find an answer. There's plenty on using AJAX to generate the list itself, but not on using it to grab PHP vars.</p> <p>Any help/advice hugely appreciated.</p> <p>The following code snips are:</p> <ol> <li>The header javascript, forming the object </li> <li>The form itself </li> <li>The PHP action script</li> </ol> <p><code><pre> function showUser(str) { if (str=="") { document.getElementById("txtHint").innerHTML=""; return; } 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("txtHint").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","tester-engine.php?q="+str,true); xmlhttp.send(); } </pre></code></p> <p>The form itself (db connection established):</p> <pre><code>&lt;form&gt; &lt;select name="profile-owner" onchange="showUser(this.value)"&gt; &lt;?php $contactresult = mysql_query("SELECT * FROM contacts"); while ($row = mysql_fetch_array($contactresult)) { echo '&lt;option value="' . $row['ContactID'] . '"&gt;' . $row['ContactLastName'] . ', ' . $row['ContactFirstName'] . '&lt;/option&gt;'; } &lt;/form&gt; &lt;div id="txtHint"&gt;&lt;b&gt;Person info will be listed here.&lt;/b&gt;&lt;/div&gt; </code></pre> <p>And, finally, the proccessing script (tester-engine.php):</p> <pre><code>&lt;?php $q=$_GET["q"]; $con = mysql_connect('####', '####', '####'); if (!$con) { die('Could not connect: ' . mysql_error()); } mysql_select_db("####", $con); $sql="SELECT * FROM contacts WHERE ContactID = '".$q."'"; $result = mysql_query($sql); echo "&lt;table border='1'&gt; &lt;tr&gt; &lt;th&gt;Firstname&lt;/th&gt; &lt;th&gt;Lastname&lt;/th&gt; &lt;/tr&gt;"; while($row = mysql_fetch_array($result)) { echo "&lt;tr&gt;"; echo "&lt;td&gt;" . $row['ContactFirstName'] . "&lt;/td&gt;"; echo "&lt;td&gt;" . $row['ContactLastName'] . "&lt;/td&gt;"; echo "&lt;/tr&gt;"; } echo "&lt;/table&gt;"; mysql_close($con); ?&gt; </code></pre> <p>Thanks in Advance!</p>
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    1. USEamonn
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    1. COAJAX is a client side script, therefore it is executed in the client's browser. PHP is server side and therefore all this code is executed before the HTTP response is sent to the client's browser. The source code the client receives is technically always 'hard-coded'. Therefore this error to me suggests that your reference to ContactID is not actually a field in the contacts table. Is this the exact name of the field (case-sensitive)? Check your source to see if this value is actually set. I would suspect it contains no value.
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      1. POGetting Ajax to execute using PHP generated values
      1. USGordyD
    2. COIf you could supply the table definition of contacts and a sample of the source code generated by your browser when viewing this page that would be useful to quickly find the cause of the problem.
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      1. POGetting Ajax to execute using PHP generated values
      1. USGordyD
    3. COThe column name is "ContactID", tbl name is "contacts" - Here's the Scource code: `<html> `<form> <select name="profile-owner" onchange="showUser(this.value)"> <option value="1">Griffin, Peter</option><option value="2">Griffin, Lois</option><option value="3">Quagmire, Glen</option><option value="4">Swanson, Joseph</option> </form> <div id="txtHint"><b>Person info will be listed here.</b></div>`
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      1. POGetting Ajax to execute using PHP generated values
      1. USEamonn
 

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