Where are the die hard JavaScripter here?

This site is best viewed in a modern browser with JavaScript enabled.

Where are the die hard JavaScripter here?

Christophe27

Hi,

I'm struggling with a problem for quite some time and would be happy to finally find a solution. I use JS on the front and backend (Node).

I store all my functionallity for the backend in one global variable. This is partially true, but for the simplicity of this example, let's go with that

GLOBAL = {
    base: {
        getTemplates: function() {
            // Contruct a template object
        },
        otherFunction: function() {
            // Do some other cool JS stuff
        }
    }
}

Ok, now I'm looking for a way to trigger a particular function on the backend, from the frontend. For the communication between front and back I use socket.io. Socket.io let you pass an object with values.

I was wondering if I could do something like this

var o = {
    namespace:  [base][getTemplates]
}

io.emit('request', o, function(templates){});

This way I hope to receive at the backend an object with a value which defines the exact places of the particular function on the backend and contruct the function on the backend like follows:

io.on('req', function( params) {

// Append the namespace to our GLOBAL variable to point the exact
// location of the function, namely GLOBAL.base.getTemplates() and
// return the result back to the frontend.
return GLOBAL[params.namespace]();

});

Can we solve this problem with something like JSON.stringify or ...

Any help is more than welcome!!!

Thanks in advance!!!

Christophe

bionoid

Hi Christophe27,

Just my 2c, but you could walk the global variable using a string you pass back.
In this example, I'm just passing back a string like "base.getTemplates" and then execute the resulting function (which I'm just alerting here):

var GLOBAL = {
    base: {
        getTemplates: function() {
        	return [COLOR="red"]'gettemplates result'[/COLOR];
        },
        otherFunction: function() {
        	return 'otherfunction result';
        }
    }
};

alert(function(params)
{

var i, path = String([COLOR="red"]params.namespace[/COLOR]).split('.'), obj = GLOBAL;
for (i = 0; i < path.length; ++i) {obj = obj[path[i]];}
return obj();

}({
	namespace : [COLOR="red"]'base.getTemplates'[/COLOR]
}));

Hope that gives you some ideas.