javascript ajax with JSON

[AeroX]

I've made a small ajax with JSON script which is 321 bytes. But i'm not sure if i left anything out (i don't normaly use javascript) browser compatibility wise.

It's used by doing:

Code: Select all

<script>
function myFunction( data )
{
    alert( data.myMessage );
}
</script>
<a href="javascript:void(0);" onClick="JSONGet( 'http://mysite.com/json.php', 'myFunction' )">Load JSON</a>

321 byte version (it could be less than 200 bytes if I used shorter var names):

Code: Select all

var JSONreq,JSONdata,JSONcall;function JSONHandler(){if(JSONreq.readyState==4){JSONdata=eval("("+JSONreq.responseText+")");eval(JSONcall+"(JSONdata)");}}function JSONGet(addr,callback){JSONcall=callback;JSONreq=new XMLHttpRequest();JSONreq.open("GET",addr,true);JSONreq.onreadystatechange=JSONHandler;JSONreq.send(null);}

Readable Version:

Code: Select all

var JSONreq, JSONdata, JSONcall;

function JSONHandler()
{
    if( JSONreq.readyState ==  4 )
    {
        JSONdata = eval( "(" + JSONreq.responseText + ")" );
        eval( JSONcall + "(JSONdata)" );
    }
}

function JSONGet( addr, callback )
{
    JSONcall = callback;
    JSONreq = new XMLHttpRequest();
    JSONreq.open( "GET", addr, true );
    JSONreq.onreadystatechange = JSONHandler;
    JSONreq.send( null );
}

[AeroX]

I'll post up the php half of this script when i'm not busy.