[En-Nut-Discussion] Ajax on ethernut

[Ole Reinhardt]

Hi Jörg,

> does anyone have any experience with ajax webfrontends on ethernut. Is
> there a recommandation for a softwarepackage?

We are using "Ajax" widely in a customers project together with normal
CGIs. The CGIs are transfering data in JSON format and are receiving the
data as standard POST requests.

As Ajax library we are using JQuery (http://jquery.com/), a very modular
and extendable javascript library which also has a nice set of
"widgets".

The JQuery library itself together with the plugins might become too
large for the internal flash of your board, but at least the flash of
Ethernut3 should be large enough. On the other hand you can hold your
webroot on an external flash card (SD-Card).

If you don't want to use any library at all you can also write very
simple "Ajax" code like this:

<script type="text/javascript"><!--
	var http = null;

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

	function request_data () { 
		http_data.open( "GET", "/cgi-bin/data.cgi?T=1&X=2", true ); 
		http_data.onreadystatechange = show_data; 
		http_data.send( null ); 
	}

	function show_data() {
		if( http_data.readyState == 4 ) {
			document.getElementById( "data" ).innerHTML = http_data.responseText;
		}
	}

-->

Just call request_data() to request any dynamic html code piece and
insert it in a <div> with the ID "data".

If you need support, just let us know...

Regards,

Ole Reinhardt 

-- 

Thermotemp GmbH, Embedded-IT

Embedded Hard-/ Software and Open Source Development, 
Integration and Consulting

http://www.embedded-it.de

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