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Thread: Where are the die hard JavaScripter here?

  1. #1
    Join Date
    Jan 2010
    Location
    Belgium
    Posts
    319

    Where are the die hard JavaScripter here?

    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

    Code:
    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

    Code:
    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:

    Code:
    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

  2. #2
    Join Date
    Dec 2011
    Location
    Centurion, South Africa
    Posts
    792
    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):

    Code:
    var GLOBAL = {
        base: {
            getTemplates: function() {
            	return 'gettemplates result';
            },
            otherFunction: function() {
            	return 'otherfunction result';
            }
        }
    };
    
    alert(function(params)
    {
    
    	var i, path = String(params.namespace).split('.'), obj = GLOBAL;
    	for (i = 0; i < path.length; ++i) {obj = obj[path[i]];}
    	return obj();
    
    }({
    	namespace : 'base.getTemplates'
    }));
    Hope that gives you some ideas.
    JavaScript: Learn | Validate | Compact

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