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POFirst small foodstore-project with ajax - does not execute
 

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  1. POFirst small foodstore-project with ajax - does not execute
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    <p>I have just started to learn Ajax and have watched a tutorial on how to write a small input that checks whether a foodstore has something in stock or whether it hasn't.</p> <p>I have double-checked the code several times but it still does not execute anything. I would be glad if anyone could help me here.</p> <p>The code is basically three files:</p> <p><strong>Index.html</strong></p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;script type="text/javascript" src="foodstore.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body onload="process()"&gt; &lt;h3&gt;The Food Store&lt;/h3&gt; &lt;p&gt;Enter the food you would like to have:&lt;/p&gt; &lt;input type="text" id="userInput"&gt; &lt;div id="underInput"/&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><strong>foodstore.php</strong></p> <pre><code>&lt;?php header('Content-Type: text/xml'); echo '&lt;xml version="1.0" encoding="UTF-8" standalone="yes" ?&gt;'; echo '&lt;response&gt;'; $food = $_GET['food']; $foodArray = array('tuna', 'bacon', 'beef', 'ham'); if(in_array($food,$foodArray)) { echo 'We do have '.$food'!'; echo '&lt;/response&gt;'; } } ?&gt; </code></pre> <p><strong>and finally the foodstore.js</strong></p> <pre><code> var xmlHttp = createXmlHttpRequestObject(); function createXmlHttpRequestObject() { var xmlHttp; if(window.ActiveXObject) { try{ xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } catch(e){ xmlHttp = false; } }else{ try{ xmlHttp = new XMLHttpRequest(); } catch(e){ xmlHttp = false; } } if(!xmlHttp) alert("Cant create that object!"); else { return xmlHttp; } } // This is now the communication part! function process() { if(xmlHttp.readyState==0 || xmlHttp.readyState==4){ food = encodeURIComponent(document.getElmentById("userInput").value); xmlHttp.open("GET", "foodstore.php?food=" + food, true); xmlHttp.onreadystatechange = handleServerResponse; xmlHttp.send(null); }else{ setTimeout('process()',1000); } } function handleServerResponse() { if(xmlHttp.readyState==4){ if(xmlHttp.status==200){ xmlResponse = xmlHttp.responseXML; xmlDocumentElement = xmlResponse.documentElement; message = xmlDocumentElement.firstChild.data; document.getElementById("underInput").innerHTML = '&lt;span styel="color:blue"&gt;' + message + '&lt;/span&gt;'; setTimeout('process()',1000); }else{ alter('Something went wrong!'); } } } </code></pre> <p>I would really appreciate some help. I also read in the youtube-comments that jQuery would rather be easier to use as far as the js part goes. Is that true?</p> <p>Many thanks!</p>
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    1. COI don't know where to start. Almost everything, possibly just everything, is wrong here. Find a different tutorial and start again.
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    2. COOk thanks. Actually the tutorial seemed to be quite good. Was made by thenewboston.com and was rated quite positive. I thought I would have maybe a minor mistake in here..?
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      1. USpatrick
 

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