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POSend and trunc variable without key press (onChange between Ajax and PHP)
 

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    <p>before starting with the code I try to explain what I would like to achieve:</p> <p>I have an input where the user will write a code (bar code) with a barcode reader with keyboard emulation so he will write something like: 123465789.</p> <ol> <li>I would like to take all these numBers</li> <li>Truncate them because I only need first 4 chars: 1234.</li> <li>Pass this value to the db that will check which item corresponds to this number</li> <li>Add to 'stock' number of the item.</li> <li>Clean the form</li> <li>Repeat as fast as possible.</li> </ol> <p>Ok, now that I tried to explain let's start with the funny part, my code:</p> <p>file 1: change.php</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;style&gt; fieldset { margin-bottom: 1em; } input { display: block; margin-bottom: .25em; } #print-output { width: 100%; } .print-output-line { white-space: pre; padding: 5px; font-family: monaco, monospace; font-size: .7em; } &lt;/style&gt; &lt;script src="http://code.jquery.com/jquery-latest.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form&gt; &lt;fieldset&gt; &lt;label for="troncami"&gt;Type Something:&lt;/label&gt; &lt;input id="troncami" type="text" /&gt; &lt;/fieldset&gt; &lt;/form&gt; &lt;div id="risultatotroncato"&gt;&lt;/div&gt; &lt;script&gt; $('#troncami').keyup(function(event) { var str = $(this).serialize(); $.ajax({ type: "GET", // the kind of data we are sending url: "troncare.php", // this is the file that processes the form data data: str, // this is our serialized data from the form success: function(msg){ // anything in this function runs when the data has been successfully processed // this sets up our notification area for error / success messages $("#risultatotroncato").ajaxComplete(function(event, request, settings) { result = msg; // msg is defined in sendmail.php $(this).html(result); // display the messages in the #note DIV }); $('input[name=troncami]').val(msg); } }); }).keydown(function(event) { if (event.which == 13) { event.preventDefault(); } }); $('#other').click(function() { $('#target').keyup(); });&lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>File 2: troncare.php</p> <pre><code>&lt;?php $risultatotroncato = 0; $risultatotroncato = substr ($_GET['troncami'],0,4); echo $risultatotroncato; ?&gt; </code></pre> <p>Obviusly it doesn't work the only thing I can see is a NOTICE error:</p> <blockquote> <p>Notice: Undefined index: troncami in D:\Locali\xampp\htdocs\combobox\troncare.php on line 6</p> </blockquote> <p>So my question is how can I pass the value written in the input to $_GET / $_POST so I'll be able to 'manage' it with 'troncare.php' ? How can I do it as fast as possible so the user will be able to 'shot' with the barcode scanner without stopping and have the value saved on the DB in, almost, 'real time' ? Thank you very much!</p> <p>(As you probably already know I'm still studying PHP and AJAX and jQuery so in a couple of years/months I'll be able to do it my by self but... I need it ASAP so, could you please help me?)</p>
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