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    <p>I think that the OP is asking how bit.ly converts the long URL into a shorter URL without reloading the page. This would be done with an AJAX call to a web page, that has a script running on it.</p> <p>Here is my attempt getting a similar effect on a form submit, I don't know what aspect is what you are most interested in.</p> <pre><code>&lt;script type="text/javascript"&gt; document.getElementById('formElement').onsubmit = "return requestURL();"; function requestURL() { var data = document.getElementById('formInputData').value; // get value from &lt;input type="text" id="formInputData /&gt; if (window.XMLHttpRequest) { var request=new XMLHttpRequest(); // code for IE7+, Firefox, Chrome, Opera, Safari } else { var request=new ActiveXObject("Microsoft.XMLHTTP"); // code for IE6, IE5 } request.onreadystatechange=function() { if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200) { // if the request worked, output the data the server returned (PHP, .net, etc.) document.getElementById('serveroutput').innerHTML = result.responseText; } request.open("GET", "serverscript.ext?data="+data, "true"); // Setup the server request request.send(); // Send the request to the server return false; // Stops the form from submitting normally } &lt;/script&gt; </code></pre> <p>This example has no security, style, or other special stuff, but might give a better idea.<br> JSON or similar methods are probably used to get data back to JavaScript, which then styles and displays the data. I can't give specifics of what bit.ly uses, but this is the idea I would use if I tried a similar JavaScript solution.</p> <p>How did I answer the question? Did I answer something completely different? Should I expand on the answer? Do I ask too many questions? (Yes to the last question)</p> <hr> <p>In response to a comment upon pressing the space bar, that functionality can be added to the above code with the following function.</p> <pre><code>&lt;script type="text/javascript"&gt; document.getElementById('formInputData').onkeypress = function() { if(document.getElementById('formInputData').value.split('')[-1] === " ") { document.getElementById('formInputData').value = document.getElementById('formInputData').value.substring(0, str.length - 1); requestURL(); } } &lt;/script&gt; </code></pre>
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    1. COya that's pretty much what i was asking, like how bit.ly converts the long URL into a shorter URL as the user is typing.
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    2. COTechnically it's not as the user is typing, the URL is converted after the user submits the form. If I answered your question, you can mark the question as answered so others know it has been solved.
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    3. COno the way bit.ly has it is as the user finishes typing a site, it automatically changes the long url to short url (without submitting the form), i guess ur answer isn't really what I'm looking for. for example: as i type "hello this is my twitter www.twitter.com/myTwitter come look at my tweets!" as soon as i finish typing "myTwitter" and press space that long url is changed to short url. I'm guessing bit.ly checks every word when user presses space?
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