A way to encapsulte ( add privacy ) to models in the MVC?

问题

I namespace my models and a single controller like this:

var MC = {};

and then added properties as needed.

For example, the code that initializes all my models looks like this:

MC.initAll = function() {

    MC.MASettings.init();
    MC.MATweet.init();

    MC.MUserTry.init();
    MC.MUserNew.init();
    MC.MUserExist.init();

    Su.UserOut.init();
    Su.Media.init();
}

I plan on changing this to a loop...just loop through MC, and if init() exists execute it.

The only thing that bothers me about this architecture is there is no privacy or encapsulation in the traditional sense that everything is public.

Also, I don't instantiate my models, I just call them as functions, but this is pretty much the same as instantiation in .js.

Is there a simple way to add privacy to my models and still have them accessible as properties in an object.

Just for an example here is my simplest model :

MC.MUserTry = {
    init: function() {
        document.getElementById( 'ut_but' ).addEventListener( "click", function( ) {
            MC.Controller( MC.o_p( 'MUserTry' ) );
        }, false );
    },
    pre : function( o_p ) {
        o_p.page.email = document.getElementById( 'ut_but' ).getAttribute( 'data-email' );
        return o_p; 
    },
    post : function( o_p ) {
        sLocal( o_p.server.hash, o_p.server.privacy, o_p.server.name, o_p.server.picture, 'ma' );
        vStateUpdate( o_p.server.name, o_p.server.picture, o_p.server.privacy );
        vTPane( o_p.server.tweets ); vBPane( o_p.server.bookmarks ); 
        vFlipP( 'ma' ); 
    }
};

pre() runs before an ajax call, post() after, and init() is called via an onload event or similar.

Here is the controller that actually implements this.

MC.Controller = function( o_p ) {

   console.log( 'o_p = ' + o_p.model );

   var t1, t2, t3, t4, 
       i1, i2, i3, i4,
       o_p_string_send;

    if( SU.get('debug') ) {
        t1 = new Date().getTime();
    }

    o_p = MC[ o_p.model ].pre( o_p );  

    if ( o_p.result !== 'complete' ) {
        o_p_string_send = JSON.stringify( o_p );

        if( SU.get('debug') ) {
            t2 = new Date().getTime();
            console.log( '---------------Server Send: \n ' + o_p_string_send );
        } 

        cMachine( 'pipe=' + o_p_string_send , function( o_p_string_receive ) {

            if( SU.get('debug') ) { 
                console.log( '---------------Server Receive: \n ' + o_p_string_receive ); 
                t3 = new Date().getTime();
            }

            o_p.server = JSON.parse( o_p_string_receive );

            MC[ o_p.model ].post( o_p );

            if( SU.get('debug') ) {
                t4 = new Date().getTime(); i1 = t2-t1 ; i2 = t3-t2 ; i3 = t4-t3; i4 = o_p.server.time;
                console.log( '---------------Time: \n Pre | Transit | Post | Server = ', i1, ' | ', i2, ' | ', i3,' | ', i4 );  
            }

        } );
    }
};

I would like to add privacy. How do I do this and still keep my models accessible as object properties?

Related

How to create global, instance based objects from local scope?

回答1:

Is there a simple way to add privacy to my models and still have them accessible as properties in an object?

Obviously, you then will need to make the whole object private. And yes, that will work as any other privacy in JavaScript, too - a closure.

Have a look at the module pattern (there are many tutorials out on the web about this).

回答2:

you can do this with closures.

var MyNamespace = {};
MyNamespace.MyClass = (function() {
    function privateMethod() {
        // ...
    }

    function publicMethod() {
        // can call privateMethod() from in here
    }

    return ({
        publicMethod: publicMethod
    });
}());

This will create an object called MyNamespace.MyClass with one private method and one public method. In your case you probably want to do this for each model class. Have their init methods be public and hide their other methods.

来源：https://stackoverflow.com/questions/11804475/a-way-to-encapsulte-add-privacy-to-models-in-the-mvc

标签

javascript

architecture