Rasmus’ 30 second AJAX Tutorial
I find a lot of this AJAX stuff a bit of a hype. Lots of people have been using similar things long before it became “AJAX”. And it really isn’t as complicated as a lot of people make it out to be. Here is a simple example from one of my apps. First the Javascript:
function createRequestObject() { var ro; ro = (window.ActiveXObject) ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest(); return ro; } var http = createRequestObject(); function sndReq(action) { http.open('get', 'rpc.php?action='+action); http.onreadystatechange = handleResponse; http.send(null); } function handleResponse() { if(http.readyState == 4){ var response = http.responseText; var update = new Array(); if(response.indexOf('|') != -1) { update = response.split('|'); document.getElementById(update[0]).innerHTML = update[1]; } } }
This creates a request object along with a send request and handle response function. So to actually use it, you could include this js in your page. Then to make one of these backend requests you would tie it to something. Like an onclick event or a straight href like this:
<a href="javascript:sndReq('foo')">[foo]</a>That means that when someone clicks on that link what actually happens is that a backend request to rpc.php?action=foo will be sent.
In rpc.php you might have something like this:
switch($_REQUEST['action']) { case 'foo': /* do something */ echo "foo|foo done"; break; ... }
Now, look at handleResponse. It parses the “foo|foo done” string and splits it on the ‘|’ and uses whatever is before the ‘|’ as the dom element id in your page and the part after as the new innerHTML of that element. That means if you have a div tag like this in your page:
<div id="foo"></div>
Once you click on that link, that will dynamically be changed to:
<div id="foo">
foo done
</div>That’s all there is to it. Everything else is just building on top of this. Replacing my simple response “id|text” syntax with a richer XML format and makine the request much more complicated as well. Before you blindly install large “AJAX” libraries, have a go at rolling your own functionality so you know exactly how it works and you only make it as complicated as you need. Often you don’t need much more than what I have shown here.
Expanding this approach a bit to send multiple parameters in the request, for example, would be really simple. Something like:
function sndReqArg(action,arg) { http.open('get', 'rpc.php?action='+action+'&arg='+arg); http.onreadystatechange = handleResponse; http.send(null); }
And your handleResponse can easily be expanded to do much more interesting things than just replacing the contents of a div.
-Rasmus
(Original Post @ php-general mailing list)
[...] Rasmus’ 30 second AJAX Tutorial [...]
[...] Rasmus’ 30 second AJAX Tutorial [...]
[...] CoderLab’s Blog » Rasmus’ 30 second AJAX Tutorial (tags: ajax) [...]
[...] Rasmus’ 30 second AJAX Tutorial I find a lot of this AJAX stuff a bit of a hype. Lots of people have been using similar things long before it became “AJAX”. And it really isn’t as complicated as a lot of people make it out to be. Here is a simple example from one of my apps. [...]
[...] Rasmus’ 30 second AJAX Tutorial I find a lot of this AJAX stuff a bit of a hype. Lots of people have been using similar things long before it became “AJAX”. And it really isn’t as complicated as a lot of people make it out to be. Here is a simple example from one of my apps. [...]
[...] Rasmus 30 second AJAX Tutorial : first program using Ajax at CoderLab [...]
[...] Rasmus 30 second AJAX Tutorial : first program using Ajax at CoderLab [...]
[...] Rasmus 30 second AJAX Tutorial : first program using Ajax at CoderLab [...]
[...] Rasmus 30 second AJAX Tutorial : first program using Ajax at CoderLab [...]
[...] Rasmus 30 second AJAX Tutorial : first program using Ajax at CoderLab [...]
[...] Rasmus 30 second AJAX Tutorial : first program using Ajax at CoderLab [...]
[...] Nico dejó en los comentarios el enlace a otro tutorial muy bueno también que brilla por su simplicidad, una especie de_“hola mundo”_ en AJAX y en 30 segundos
(en inglés). [...]
[...] Rasmus 30 second AJAX Tutorial : first program using Ajax at CoderLab [...]
[...] Rasmus 30 second AJAX Tutorial : first program using Ajax at CoderLab [...]
[...] Bu makaleyi yazarken özellikle Rasmus’ 30 second AJAX Tutorial baÅŸlıklı yazısından faydalandım. [...]
[...] Rasmus’ 30 second AJAX Tutorial Nothingrows AJAX XMLHttpRequest Vikipedi Ajax Nasıl? XMLHttpRequest Nedir? Ne iÅŸ yapar? [...]
[...] Rasmus 30 second AJAX Tutorial : first program using Ajax at CoderLab [...]
[...] side, but first lets look at the javascript, the code for this short program has been taken from http://blog.coderlab.us/rasmus-30-second-ajax-tutorial/ if anyone doesn’t understand my [...]
[...] Rasmus 30 second AJAX Tutorial : first program using Ajax at CoderLab [...]
[...] Rasmus’ 30 second AJAX Tutorial I find a lot of this AJAX stuff a bit of a hype. Lots of people have been using similar things long before it became “AJAX”. And it really isn’t as complicated as a lot of people make it out to be. Here is a simple example from one of my apps. [...]
[...] Rasmus’ 30 second AJAX Tutorial Nothingrows AJAX 30 Saniyede AJAX Öğrenin XMLHttpRequest Vikipedi Ajax Nasıl? XMLHttpRequest Nedir? Ne iÅŸ yapar? [...]
[...] find das Tutorial sehr cool CoderLab’s Blog » Rasmus’ 30 second AJAX Tutorial __________________ Die [...]
[...] 30 Second AJAX Tutorial Introduces you to a quick overview of the AJAX concept. Read the article then see a demonstration of how it works at mGroves.com. [...]
[...] Rasmus’ 30 second AJAX Tutorial Nothingrows AJAX 30 Saniyede AJAX Öğrenin XMLHttpRequest Vikipedi Ajax Nasıl? XMLHttpRequest Nedir? Ne iÅŸ yapar? AJAX-TR.COM » 30 Saniyede AJAX [...]
[...] Rasmus 30 second AJAX Tutorial [...]
[...] Rasmus’ 30 second AJAX Tutorial I find a lot of this AJAX stuff a bit of a hype. Lots of people have been using similar things long before it became “AJAX”. And it really isn’t as complicated as a lot of people make it out to be. Here is a simple example from one of my apps. [...]
[...] Rasmus’ 30 second AJAX Tutorial [...]