pf » AJAX Tutorial with Prototype

December 13, 2005

AJAX Tutorial with Prototype

Here's the AJAX prototype example that I used in my AJAX presentation today.

I wanted to give an example of a good use of AJAX, and at the same time keep it simple. So I thought a good example would be to build a zip code verifier. As soon as the person enters the zip code it makes a request to the server to see if the zip code is in the database, and returns the city and state.

So the user first sees this:

Once the zip code is entered, and the response received it looks like this:

zip code form input with validated zip code

If the zip code is not found in the db:

zip code form input with invalid zip code

Ok, now lets build it...

Download prototype, and a zip code db

First you need to download prototype.js from prototype.conio.net

Next you need to downloaded a zip code database. The one I linked to is free, and for MySQL.

zipcode_example.html

<html>
<head>
<title>AJAX Zip Checker </title>
<link rel="stylesheet" href="style.css" type="text/css" />
<script src="prototype.js" language="JavaScript" type="text/javascript"></script>
<script type="text/javascript" language="JavaScript">
function checkZip() {
if($F('zip').length == 5) {
var url = 'checkZip.cfm';
var params = 'zip=' + $F('zip');
var ajax = new Ajax.Updater(
{success: 'zipResult'},
url,
{method: 'get', parameters: params, onFailure: reportError});
}
}
function reportError(request) {
$F('zipResult') = "Error";
}
</script>
</head>
<body>
<form>
<label for="zip">zip:</label>
<input type="text" name="zip" id="zip" onkeyup="checkZip();" />
<div id="zipResult"></div>
</form>
</body>
</html>

We are using the onkeyup event in the zip code input tag to fire the JavaScript function checkZip().

When the zip code length is 5, we make the AJAX request using prototype's Ajax.Updater class. This class will update the innerHTML value of any element on our page. In our example we are having it update the div with id of zipResult.

Prototype also lets us define an error handler, we are using the function reportError to handle this.

By now you're probably wondering what the $F() function does. If you aren't then you're not paying attention, or you already know! It is a function provided by AJAX to get the value of any element, for an input text box it sets the value property, on a div it sets the innerHTML property. Use it with care, it can add a perl like mystic to your JavaScript if overused.

checkZip.cfm

<cfif NOT IsDefined("url.zip") OR NOT IsNumeric(url.zip)>
<div class="badzip">Please enter a valid zip code.</div><cfabort>
</cfif>
<cfquery datasource="mysql_test" name="ziplookup">
SELECT city, state FROM zipcodes
WHERE zip = <cfqueryparam cfsqltype="cf_sql_integer" value="#url.zip#">
</cfquery>
<cfif ziplookup.recordcount>
<div class="goodzip"><cfoutput>#ziplookup.city#, #ziplookup.state#</cfoutput></div>
<cfelse>
<div class="badzip">Zip code not found.</div>
</cfif>

Above is some ColdFusion code that outputs the city and state, or an error message.

style.css

body { font-family: verdana; }
#zipResult { position:absolute; margin-left: 20px; display:inline; color: grey; font-size:large; }
.goodzip { background: url("greencheck.gif") no-repeat left; padding-left:20px; }
.badzip { color: red; }
input { font-size: large; }
label { font-size:large; color: silver; }

Not that the CSS does much in this example, but in case your curious there it is.

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Comments

On 12/13/2005 at 6:18:07 PM MST Sami Hoda wrote:

Pete,

Here is a new AjaxCFC just released! http://www.robgonda.com/blog/index.cfm

Do you think you could re-do your example with this in less code?

Sami

On 12/15/2005 at 9:59:20 AM MST Ryan Guill wrote:

Pete, How do you import the zip mysql database into your server? I am using mysql 5...

On 12/15/2005 at 10:13:49 AM MST Pete Freitag wrote:

Hey Ryan,

Easiest way would be to use the MySQL Query Browser: http://www.mysql.com/products/tools/ then file open script, and run it.

On 12/15/2005 at 10:22:11 AM MST Ryan Guill wrote:

Awesome! Thanks!

On 01/15/2006 at 2:40:03 PM MST John Wiseman wrote:

Nice article, Another great AJAX starting article is:

http://www.johnwiseman.ca/blogging/?p=61

On 01/15/2006 at 2:54:49 PM MST Ben Evans wrote:

just wanted to clarify that the $F() function is not "provided by AJAX", it is part of the prototype.js library.

Also, you may want to point out that Prototype is not necessary to perform AJAX functions, it simply has some javascript functions that help make AJAX programming a bit easier.

On 01/15/2006 at 3:20:45 PM MST Anonymous wrote:

Uholy macarena! I just found out much do my eyes hurt by doing things in bare javascript and html. You should have a look at seaside.

On 01/15/2006 at 3:44:09 PM MST Anonymous wrote:

Nice. Stolen from http://www.webpasties.com/xmlHttpRequest/ though.

On 01/15/2006 at 7:45:01 PM MST Some guy wrote:

Please please please learn the difference between "your" and "you're". It takes away from your otherwise excellent tutorial.

On 01/15/2006 at 8:31:11 PM MST Chris wrote:

Aye! A fellow central New Yorker! (I wasn't aware any existed!)

This tutorial is awesome, thanks for it, I'll definitely put it to use.

Chris www.comitar.com

On 01/15/2006 at 10:29:05 PM MST Jordan Meeter wrote:

Hi, I live in New Hartford, NY. I see you used the area code 13501... Do you live in Utica? :]

On 01/16/2006 at 3:46:33 AM MST Mick OReilly wrote:

While this is only an example, it's important for developers to ensure that their form will still validate without a zip code as there are billions of people outside the US who do not use zip codes.

On 01/16/2006 at 5:50:02 AM MST Anonymous wrote:

Anonymous said: "Uholy macarena! I just found out much do my eyes hurt by doing things in bare javascript and html. You should have a look at seaside."

As the seaside site says: "Seaside is a framework for developing sophisticated web applications in Smalltalk." There are other much better web application frameworks in languages with a smaller learning curve and much more usage on the net (reusable skills) that do the same encapsulation as seaside.

Or you could just learn some javascript and html. :)

On 01/16/2006 at 8:17:10 AM MST Dave wrote:

A working example would have been nice, so we could see the AJAX in action.

On 01/16/2006 at 4:57:01 PM MST Kris Bright wrote:

I believe your error handling section needs to be changed ...

from: $F('zipResult') = "Error";

to: $('zipResult').innerHTML = "Error";

I enjoyed the tutorial.

Thanks, Kris

On 01/16/2006 at 5:06:20 PM MST Ben Evans wrote:

To expand on the comment by Kris Bright:

$F() is a function that interacts with the value of the named form element. If the 'zipResult' element was a form element, then the original code would work.

A good reference for prototype.js can be found here: http://www.sergiopereira.com/articles/prototype.js.html

On 01/16/2006 at 9:37:24 PM MST Pete Freitag wrote:

Just to clarify things, this tutorial was NOT stolen from "webpasties", I came up with the idea on my own, and I have never been to that site.

I don't think it is too far fetched that two people would think to use zip codes and AJAX together.

On 01/17/2006 at 10:07:16 PM MST Rob Gonda wrote:

Sami, thanks for mentioning ajaxCFC. Perhaps I have a similar example in my project site:

http://www.robgonda.com/blog/projects/ajaxcfc/examples/zipcode/

Cheers,

-Rob

On 01/18/2006 at 4:05:02 AM MST qwerty wrote:

i want ajax examples

On 02/03/2006 at 8:24:17 AM MST Candice wrote:

Thanks for the example. I used it to create a validator for application fee waiver codes on a college website. It works pretty much exactly the same way that this example works. My only question is, is there a way to clear the input box when the code is invalid? I tried adding javascript to my 'checkwaiver.cfm' file (which would be the equivalent of 'checkzip.cfm') but the javascript does not run at all. Thanks!

On 02/03/2006 at 9:15:49 AM MST Pete Freitag wrote:

Hi Candice,

I'm not sure if the JS would run actually. An easy way to test is to just do a javascript alert... <script language="javascript" type="text/javascript">alert('hi');</script>

If that alert works then you want to do something like document.forms[0].zip.value=';

Another way to do it would be to return a status code other than 200 from your checkzip that would probably cause the reportError() function to be called. I am sure there is also probably a method in prototype that you might be able to use.

On 02/03/2006 at 10:09:15 AM MST Candice wrote:

Thanks for the response Pete. No javascript in checkwaiver.cfm will run - not even a simple alert. I will look through prototype for a method that does what I'm looking for.

On 02/07/2006 at 4:37:32 AM MST santosh wrote:

this is realy a help ful tutorial thanx

On 02/09/2006 at 10:06:03 AM MST dennis wrote:

Squeak doesn't have such an awful learning curve, I know a high-school kid who's doing just fine with it. A good tutorial on Seaside is at http://beta4.com/seaside2/tutorial.html...takes less than an hour to go through, and it's quite impressive.

On 02/23/2006 at 5:27:17 AM MST Critter wrote:

I had attempted to change the success to a function, rather than having it update the contents of a div, but it never seemed to fire. (i had "success: ajaxsuccess") I then trie "success: ajaxsuccess()" which would fire the function upon success, but it did not pass along the response. I did a bit of digging around and saw on http://www.sergiopereira.com/articles/prototype.js.html that there is an Ajax.Request which just returns the response. I was then able to check the status of the response and fire off whatever events I needed.

On 02/28/2006 at 6:28:30 PM MST jais wrote:

Can I Use Ajax for live streaming of data from stock market for trading.

Regards jais

On 03/11/2006 at 12:04:23 AM MST alex wrote:

jais, to use AJAX for live streaming of stock quotes check out the "streaming AJAX" paradigm implemented by Lightstreamer. See www.lightstreamer.com (many online demos are available).

On 03/21/2006 at 9:32:30 AM MST edmund wrote:

Hi,

After reading your site with the ajax tutorial, I was trying to change the GET method to a POST method.

I am not sure why the following doesn't work, I apprecipate your insight to solving this problem

// the ajax script var url = "process.php"; http.open("POST", url, true); ... // then in the html form, i use method="post" and have a input field with 'username' as id and name.

in the process.php <? $username = $_POST['username']; ?>

But whenever I use the POST in the ajax script, I can't get anything in the username

I can only do it with a GET (as in your example in the webpage)

// the ajax script var username = ...; var url = "process.php?param="; http.open("POST", url + username, true);

I will apprecipate if you can tell me what's wrong with the POST

Thank you Edmund

On 03/26/2006 at 2:47:23 AM MST marengo wrote:

hi,

this is great!!! really nice peace of code!

does it work with old versions browsers? Where can i get a list of browsers and verstions that work with this?

I tested with: Mozilla 1.7.12 -> OK! Mozilla 1.6 -> OK! IE 7 beta 2 -> OK! IE 5 -> it do not works :( i get javascripts bugs

On 03/27/2006 at 12:26:05 PM MST Lilupa wrote:

Hi edmund,

Even i had the same problem with GET AND POST.

Found a solution;

var req;

function validate() { if (window.XMLHttpRequest) { req = new XMLHttpRequest(); } else if (window.ActiveXObject) { req = new ActiveXObject("Microsoft.XMLHTTP"); } }

function complete() { req.onreadystatechange = processRequest; req.open("POST", "a.php", true); req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); req.send("searchmode=basic&primelocation=Colombo"); }

function processRequest() { if (req.readyState == 4) { if (req.status == 200) { var msg = req.responseText; alert(msg); } } }

when its post you dont send the parameters in the url.

Cheers, LDM

On 03/28/2006 at 2:13:31 AM MST preet wrote:

hi, i need full tutorial for ajax.is it possible for u to give

On 03/28/2006 at 10:34:10 PM MST rima wrote:

hai i need full tutorial for ajax too. coz i have project using ajax in my colege! thank's ^-^ chibirima_22@yahoo.com indonesia...

On 03/29/2006 at 9:09:16 PM MST kurt wrote:

This code work with IE browser, but not with my Fire Fox browser. Is there a tweek to make it work with fire fox? Again, great work; really appreciate your efforts.

On 04/10/2006 at 10:30:27 AM MDT MUTEGANDA AMON wrote:

I would like to have more of the codes to read, otherwize its agood work.

On 04/29/2006 at 9:52:49 PM MDT allan wrote:

Nice work, just wondering is it good policy to create a new Ajax.Updater object on each call? (var MyAjax = new Ajax.Updater)

I can't seem to get it to work otherwise, but want to optimize if it help speed up response, lower overhead.

On 05/05/2006 at 11:11:43 AM MDT PHP Coder wrote:

Hi,

I tried to rewrite this in PHP (version 4) but I get a javascript error "Object Expected"

Any thoughts?

On 05/05/2006 at 11:43:57 AM MDT PHP Coder wrote:

Nevermind - stupid mistake... Thanks for the tutorial, I rewrote it in PHP and works brilliantly!

On 05/10/2006 at 5:16:03 AM MDT Jessey wrote:

This tutorial has been a big help. However, I haven't been able to use a full url (our coldfusion server is on a separate box). I had to place all the files on the cf server. Any reason why this would be?

On 05/10/2006 at 12:29:38 PM MDT Jessey wrote:

AH, I figured it out. The whole cross-domain security thing, thus I need a proxy.

On 05/14/2006 at 8:43:41 PM MDT Cj wrote:

Thanks for the tutorial - I also re-wrote it in PHP + MySQL and it worked a treat.

On 05/14/2006 at 9:10:23 PM MDT Free Articles Tutorials wrote:

A working example would have been nice, so we could see the AJAX in action.

On 05/14/2006 at 9:11:09 PM MDT Free Articles Tutorials wrote:

A working example would have been nice, so we could see the AJAX in action.

http://www.excellentguide.com/article

On 05/14/2006 at 9:11:40 PM MDT Free Articles Tutorials wrote:

AH, I figured it out. The whole cross-domain security thing, thus I need a proxy.

http://www.excellentguide.com/article

On 05/18/2006 at 3:40:25 PM MDT Bharat wrote:

$F is function provided by prototype, not AJAX

On 05/27/2006 at 3:11:58 PM MDT LeProgrammeur wrote:

Hi guys! Just want to share that there are some tutorials about AJAX at www.KYNOU.com. Check it out!

On 06/01/2006 at 2:53:25 AM MDT suthing wrote:

Can anyone provide me the version of php + mysql for this example? Thanks...

On 06/02/2006 at 10:15:21 AM MDT Sebastien wrote:

Hi! Thanks for sharing! I tried to do so successfully on my web site but I have a problem with variables.

In fact, I try to set session variables with my external page ($_SESSION['offset']=$_GET['offset'];), this page does receive GET informations since echo $_SESSION['offset'] works but this seems to keep local since no change appear on my first page. Thanks for helping.

On 06/06/2006 at 5:23:37 AM MDT Aarti wrote:

i try to use your code in dreamweaver,but it dont show proper output.Is this is proper software to make use of ajax.Plese tell me how i use your tutorial

On 06/07/2006 at 11:46:26 AM MDT Jerry Hughes wrote:

How do you make the result of the Ajaz response into a session variable? I returned a drop down box, seleclted one of the items from the drop down box, but cant figure how to make the selection a session variable.

On 06/08/2006 at 3:09:33 AM MDT Sebastien wrote:

@Jerry: I just did like I used for it: declare your session (session_start()) and after set your session variable with the GET value.

In details:

For your main page in the Javascript: var yourvalue1= document.getElementById("yourdiv").yourvalue1.value; var yourvalue2= document.getElementById("yourdiv").yourvalue2.value; var params = 'yourvalue1=' + yourvalue1 + '&yourvalue2=' + yourvalue2 (and more if you want); var url = 'ajax-response.php'; (...)

For "ajax-response.php": <? session_start(); $_SESSION['yourvalue1']=$_GET['yourvalue1']; $_SESSION['yourvalue2']=$_GET['yourvalue2']; ?>

My problem remains: the main page doesn't see the new values without refreshing it! If someone could help, I'd be very pleased!

On 07/05/2006 at 5:46:33 AM MDT Micheal wrote:

Good Tutorial. i will try this tutorial to www.flashgameworld.net

On 07/10/2006 at 7:01:22 AM MDT Nice guy wrote:

Or you could just learn some javascript and html. :)

----- You're totally wrong here. Smalltalk has the shortest learning curve possible. Check out the BNF and semantics with two or three smalltalks (Squeak, VisualWorks, Dolphin) before writing.

On 07/13/2006 at 1:22:10 AM MDT Sachin Gupta wrote:

Hi, I need full tutorial for ajax. Is it possible for u to give it as soon as possible?

Thanks, Sachin Gupta

On 07/24/2006 at 12:37:15 PM MDT Luke Rohenaz wrote:

redid the CFM file in PHP, hope is pastes ok:

<?php $link = mysql_connect('localhost', 'db_username', 'db_pass'); if (!$link) { die('Could not connect: ' . mysql_error()); } $db_selected = mysql_select_db('your_db_name', $link); if (!$db_selected) { die ('Can not use this db: ' . mysql_error()); }

$sql = "SELECT * FROM zipcodes WHERE zip = '$_REQUEST[zip]'"; $result=mysql_query($sql); $num = mysql_num_rows($result); if($num > 0) { while($thiszip=mysql_fetch_array($result)) { echo "<span class=\"goodzip\">$thiszip[city], $thiszip[state]</span>"; } } else { echo "<span class=\"badzip\">Zip Code Not Found</span>"; } ?>

On 07/25/2006 at 7:31:19 AM MDT bcs wrote:

hey!

if you 'POST' the data to a .asp how do you fetch it with that asp?

On 07/28/2006 at 4:19:56 AM MDT yonas wrote:

olease give me a full note on java program and some programs

On 07/30/2006 at 10:16:34 PM MDT Drew wrote:

can anyone share a php version of this? thanks. -drew;)

On 09/22/2006 at 8:59:27 AM MDT hebiryu wrote:

@yonas..

hahaha... you can try on PHP 5 or 4.

On 09/28/2006 at 2:45:57 AM MDT JC wrote:

here's my php version...

<?php $zipcode=$_REQUEST["zip"]; $cn=mysql_pconnect("localhost","root","mysql") or die( mysql_error()); mysql_select_db("ajax",$cn);

$sql="select * from zipcodes where zip=$zipcode"; $rs=mysql_query($sql,$cn);

if(mysql_num_rows($rs)>0){ $row=mysql_fetch_array($rs); print "<div class='goodzip'>$zipcode is in ".$row["city"].",".$row["state"]."</div>"; }else{ print "<div class='badzip'>$zipcode Zip code not found.</div>"; }

On 10/09/2006 at 6:24:26 PM MDT http://www.news-technology.net wrote:

Thanks for the tutorial

On 10/12/2006 at 7:01:00 AM MDT Neo wrote:

this is my version in PHP, hope this helps. Visit my site for more AJAX Tutorial www.technorepublic.com

<?php function connectdb() { $mysqluser="USER"; $mysqlpasswd="PASS"; $mysqlhost="LOCALHOST"; $dbname="DBNAME";

$connID = mysql_connect($mysqlhost, $mysqluser, $mysqlpasswd); if ($connID) { mysql_select_db($dbname); return $connID; } else exit(); }

if($zip!="" && is_numeric($zip)) { $connID=connectdb(); $q=mysql_query("SELECT city, state FROM zipcodes WHERE zip=$zip"); $r=mysql_fetch_array($q); if($r) { echo "<div class=\"goodzip\">$r[0], $r[1]</div>"; } else echo "<div class=\"badzip\">Zip code not found.</div>"; mysql_close($connID); } else echo "<div class=\"badzip\">Please enter a valid zip code.</div>"; ?>

On 10/18/2006 at 3:11:42 PM MDT greg wrote:

i was wondering how you would parse two varables for 1 sql string, like

$sql="SELECT * FROM something WHERE somethingone='$input1' AND somethingtwo='$input2'"; $rs=mysql_query($sql,$cn);

On 10/27/2006 at 9:15:07 AM MDT mark wrote:

I would also like to know how to get this to work for firefox. Thanks !

On 11/21/2006 at 11:21:28 PM MST santosh wrote:

Nice no words to say

On 11/24/2006 at 11:53:29 PM MST Rama krishna wrote:

How to use DIV tag in AJAX

On 12/04/2006 at 3:24:32 AM MST lijo wrote:

will u give us code for tree list creation in asp.ajax

On 12/09/2006 at 4:05:52 PM MST www.elektrotekno.com wrote:

does ajax has extremely CPU usage? tjere are same mods for phpbb systems, so I reluctant use it

On 12/11/2006 at 2:16:37 PM MST Alaa Moustafa wrote:

Ajaxlines will help you to find all resources to learn and know all about Ajax technology, by providing you with the latest Ajax Tutorials, Ajax Toolkits, Ajax Articles and Ajax Services.

http://www.ajaxlines.com

On 12/22/2006 at 2:59:35 AM MST zee wrote:

I am facing javascript error. Please check the following code.

On 01/02/2007 at 11:10:08 AM MST DEViNE wrote:

Zee, one thing that looks suspicious is $F('display_here') = originalRequest.responseText;

Try changing it to $F('display_here').innerHTML = originalRequest.responseText;

On 01/09/2007 at 9:55:28 AM MST Paul wrote:

Ive been looking around and came across this ajax and im not sure if it can be done. I hope somone can help me out. Heres what i need.

a page with textbox and an iframe.

the iframe defaults to a basic index holding page.

the user enters his mailbox name eg fred

this then opens the following url http://10.0.0.3/exchange/ and adds the variable onto the end

http://10.0.0.3/exchange/fred

please note the site is running off the following url http://10.0.0.2 so its a completely different url.

Is it even possible to change the parent url of the iframe. I hope you guys can help you sound brainy enough.

On 02/05/2007 at 1:46:20 AM MST eylon wrote:

Hi, I have a problem with Ajax.Updater, Instead of hebrew characters CHARSET=WINDOWS-1255 it send me other characters, any ideas?

http://www.eshmore.com

On 02/05/2007 at 2:03:39 AM MST Eylon wrote:

Hi,

I am building a new site in Hebrew using prototype.js Everything works fine, but not the new Ajax.Request('./nextPage.php', {method:'post',.... In nextPage.php I get strange character although I added header('Content-Type: text/html; charset=WINDOWS-1255'); in the start of the PHP.

Do you know if and how I can specify the Ajax.Request to use charset=WINDOWS-1255?

Thanks and Best regards, Eylon

The site which I am building: http://www.yaldut.com

On 06/01/2007 at 1:19:27 AM MDT siva wrote:

hai i need full tutorial for ajax too. becoz i going to do the project using ajax

On 06/01/2007 at 1:20:48 AM MDT sivanantham wrote:

hai i need full tutorial for ajax too. coz i have project using ajax, dharma_siva@yahoo.co.in

On 07/05/2007 at 11:07:15 AM MDT Hafiz wrote:

I cant get the MySQL zip code database. Would u email it to me?

On 07/08/2007 at 10:03:40 AM MDT Anonymous wrote:

Hi Pete, This article is very good. It would be nice if you can send me the complete presentation. Also, i cant get MySQL zip code database.

Thanks.

On 08/08/2007 at 3:31:38 PM MDT AltaGid wrote:

Hello! Help solve the problem. Very often try to enter the forum, but says that the password is not correct. Regrettably use of remembering. Give like to be? Thank you!

On 08/20/2007 at 2:25:18 AM MDT verroest wrote:

great example, but in Safari 3.0.3 it doesn't work without the .innerHTML:

function reportError(request) { $F('zipResult').innerHTML = "Error"; }

Thanks!

On 09/13/2007 at 3:07:40 AM MDT Prakash wrote:

plize help me.....? plize tell me how to stor php data without refreshing a page in ajax to database.....

On 09/26/2007 at 2:20:46 PM MDT babu wrote:

Hi! Can the CheckZip.cfm be rewritten in javascript as CheckZip.js? Has someone done that already, if so, can they provide the code here?

Thanks, Babu

On 10/28/2007 at 8:22:28 PM MST Rony wrote:

I have a CF tag that displays a JSON string and i was wondering how could i use the above example use in the JS for the current page that is showing ?

On 12/03/2007 at 6:48:57 PM MST Sean Beam wrote:

Nice article! Next time do not copy from other site! Plz do your own!

On 12/08/2007 at 12:20:04 AM MST MAHI wrote:

i want to change data of the one drop down corresponding to another dropdown

On 05/08/2008 at 2:18:53 PM MDT coderbari wrote:

Great example man.It will help me a lot.I am developing my site and want to use some AJAX based thing in it.I will prototype for it.You this article will help me a lot. Thanks.

Bari http://www.coderbari.com