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POAjax is correctly returning and displaying data but error message is being activated
 

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  1. POAjax is correctly returning and displaying data but error message is being activated
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    <p>I'm performing AJAX using the following code:</p> <pre><code>function main() { // get the name fields var name1 = document.getElementById("name1").value; var name2 = document.getElementById("name2").value; // Encode the user's input as query parameters in a URL var url = "response.php" + "?name1=" + encodeURIComponent(name1) + "&amp;name2=" + encodeURIComponent(name2); // Fetch the contents of that URL using the XMLHttpRequest object var req = createXMLHttpRequestObject(); req.open("GET", url); req.onreadystatechange = function () { if (req.readyState == 4 &amp;&amp; req.status == 200) { try { // If we get here, we got a complete valid HTTP response var response = req.responseText; // HTTP response as a string var text = JSON.parse(response); // Parse it to a JS array // Convert the array of text objects to a string of HTML var list = ""; for (var i = 0; i &lt; text.length; i++) { list += "&lt;li&gt;&lt;p&gt;" + text[i].reply + " " + text[i].name + "&lt;/p&gt;"; } // Display the HTML in the element from above. var ad = document.getElementById("responseText"); ad.innerHTML = "&lt;ul&gt;" + list + "&lt;/ul&gt;"; } catch (e) { // display error message alert("Error reading the response: " + e.toString()); } } else { // display status message alert("There was a problem retrieving the data:\n" + req.statusText); } } req.send(null); } // creates an XMLHttpRequest instance function createXMLHttpRequestObject() { // xmlHttp will store the reference to the XMLHttpRequest object var xmlHttp; // try to instantiate the native XMLHttpRequest object try { // create an XMLHttpRequest object xmlHttp = new XMLHttpRequest(); } catch (e) { // assume IE6 or older try { xmlHttp = new ActiveXObject("Microsoft.XMLHttp"); } catch (e) {} } // return the created object or display an error message if (!xmlHttp) alert("Error creating the XMLHttpRequest object."); else return xmlHttp; } </code></pre> <p>This works exactly as planned, the code within the try block is executed perfectly. But the alert <em>"There was a problem retrieving the data:</em> is also activated, with <code>req.statusText</code> displaying "OK".</p> <p>How can this be possible? How can the code within the if statement activate perfectly but at the same time the else block is activated?</p> <p>I'm stumped, any ideas?</p> <p>The servor code is simply:</p> <pre><code>&lt;?php if( $_GET["name1"] || $_GET["name2"] ) { $data = array( array('name' =&gt; $_GET["name1"], 'reply' =&gt; 'hello'), array('name' =&gt; $_GET["name2"], 'reply' =&gt; 'bye'), ); echo json_encode($data); } ?&gt; </code></pre> <p>And the HTML:</p> <pre><code>&lt;input id="name1"&gt; &lt;input id="name2"&gt; &lt;div id="responseText"&gt;&lt;/div&gt; &lt;button onclick="main();"&gt;Do Ajax!&lt;/button&gt; </code></pre>
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    1. USJamie Fearon
    1. USJamie Fearon
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    1. COthe only way I can think of that this could happen is if you're actually sending two requests, one where `req.readyState == 4 && req.status == 200` is true and one where it isn't. Check firebug. How many requests do you have?
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    2. COThe console indicates that only one request is occurring.
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    3. COCan you put up a fiddle with this code? or a demo of some sort?
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      1. USColleen
 

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