基于桌面和Web的共享Java REST / Ajax

Question

I am running a node.js back-end with a Web based javascript client to send AJAX requests.

Now, I would like to do a small desktop version of the javascript client using pure Javascript, ie Google's V8.

In this scenario, how could I enable the AJAX support for the desktop version as there are no window / document objects ? In a perfect world in such a way that the Web and Desktop versions would share the same code ?

Or would I need to write the AJAX or REST API outside the js code, ie as native code and call it from js ?

Answer 1

As Brad, says, there is currently no way to make an http request from the ECMAScript non-web implementations, even though there is a working draft at http://www.w3.org/TR/XMLHttpRequest/ to integrate XMLHttpRequest to these implementations as well (I guess through external bindings).

What I did was to create a global function and implement it in the Web version like this:

function SendBackendRequest( url, parameters, func ) 
{ 
    var request=new ajaxRequest();

    request.onreadystatechange=function() {
        if (request.readyState == 4) {
            if ( request.status == 200 || window.location.href.indexOf("http") ==-1 ) {

                func.call( this, request.responseText );
            } else {
                func.call( this, "" );
            }
        }
    }

    request.open( "POST", "http://localhost" + url, true );
    request.setRequestHeader( "Content-type", "application/x-www-form-urlencoded" );
    request.send( parameters );
};

ajaxRequest=function()
{
    var activexmodes=["Msxml2.XMLHTTP", "Microsoft.XMLHTTP"];

    if ( window.ActiveXObject ) {
        // --- IE
        for (var i=0; i<activexmodes.length; i++) {
            try {
                return new ActiveXObject(activexmodes[i])
            }

            catch(e) {
                //suppress error
            }
        }
    } else  
    {
        if (window.XMLHttpRequest) // --- Mozilla, Safari etc
            return new XMLHttpRequest();
        else return false;
    }
};

On the Desktop side I just implemented SendBackendRequest() as well and inside my client code can use the same code to communicate with the backend.