Question

I have created a new class using MooTools.
My class looks like this

Updated:

var c=new Class({
    a:'',
    b:'',
    c:'',
    d:'',
initialize:function(ee){
this.e=ee;
},
buildJSON:function()
{
var cInstance=new c(this.e);
cInstance.a=this.a;
cInstance.b=this.b;
cInstance.c=this.c;
cInstance.d=this.d;

return (JSON.encode(cInstance));
}
});

var x=new c("action");
x.a="Hello a";
x.b="Hello b";
x.c="Hello c";
x.d="Hello d";

alert (x.buildJSON());​

This is pretty a straightforward class. Now if you try it, there is an extra key on the JSON:

"$caller":null,
"caller":null

Answer 1

$caller and caller are both properties added by MooTools Class.

They exist to assist in the use of the parent method. You should clone the object and clean out the unnecessary properties before using JSON.encode on the class instance.

You could clone this and delete $caller and caller from the clone.

var c=new Class({
    a:'',
    b:'',
    c:'',
    d:'',

    initialize: function(ee) {
        this.e=ee;
    },

    buildJSON: function() {
        var data = Object.clone(this);
        delete data.$caller;
        delete data.caller;

        return (JSON.encode(data));
    }
});

var x=new c("action");
x.a="Hello a";
x.b="Hello b";
x.c="Hello c";
x.d="Hello d";

alert (x.buildJSON());​