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POPass JSON AJAX reply to PHP
 

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    <p>I have a script which uses AJAX to connect to a PHP script which queries a database and returns some values. The code of which is below:</p> <pre><code>&lt;script&gt; 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","ajaxphp.php?ID="+str,true); xmlhttp.send(); } &lt;/script&gt; &lt;select id="users" name="users" onchange="showUser(this.value)"&gt; &lt;option value=""&gt;Select a person:&lt;/option&gt; &lt;!-- PHP populates this dropdown box --&gt; &lt;/select&gt; &lt;div id="txtHint"&gt;&lt;b&gt;Selected user info will be listed here.&lt;/b&gt;&lt;/div&gt; </code></pre> <p>Right now the txtHint div will return anything the ajaxphp.php script prints. This isn't very flexible, however. What I want to do is create an array in ajaxphp.php and use json_encode() to pass the results back. </p> <p>The problem I'm having is I don't know how to get the original script to grab the results so I can do useful things with them. Right now I can make it return a JSON array which will appear in the txtHint div but I've no idea how to get PHP to actually read that information so I can do something with it.</p>
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    1. COIf you can get your PHP to return a JSON array, then it's your javascript function that needs changing, not php. Instead of `document.getElementById("txtHint").innerHTML=xmlhttp.responseText;`, you'll have your code to parse the array and do something useful with it.
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    2. COOn another topic, I suggest you have a look at an existing library, e.g. jQuery, which takes care of a lot of things for you, including handling browser differences and parsing the response back into a javascript array.
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