How to convert json to javascript object that using existing method?

Question

I have an object like this:

function Point(x,y)
{
    this.coorX = x;
    this.coorY = y;
}

function Node(id,x,y)
{
    this.id = id;
    this.point = new Point(x,y);

    this.getDescription = function(){
         return this.id + ': (' + this.punto.coorX + ', ' +  this.punto.coorY + ')';
    }

}

I export a list of node in json format with:

 JSON.stringify(NodeList);

json:

 {"NodeList":[{"id":0,"point":{"coorX":15,"coorY":15},"$$hashKey":"004"},{"id":1,"point":{"coorX":15,"coorY":151},"$$hashKey":"009"},{"id":2,"point":{"coorX":25,"coorY":15},"$$hashKey":"00E"}]}

After if I import the same json with:

 NodeList = JSON.parse(text);

After the import how can I use the Node function getDescription()?

friedi · Accepted Answer · 2014-03-28 20:23:07Z

1

You can recreate your nodes, like so:

var items = NodeList.NodeList,
    nodes = [];

for(var i = 0; i < items.lenght; i++) {
    var item = items[i],
        point = item.point,
        node = new Node(item.id, point.coorX, point.coorY);

    nodes.push(node);
}

// call getDescription of first node
nodes[0].getDescription();

answered Mar 28, 2014 at 20:23

friedi

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Ярослав Рахматуллин · Accepted Answer · 2014-03-28 20:18:21Z

0

JSON is not a programming language. It supports data as opposed to methods.

answered Mar 28, 2014 at 20:18

Ярослав Рахматуллин

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1 Comment

Ярослав Рахматуллин Over a year ago

JSON (JavaScript Object Notation) is a lightweight data-interchange format.

Hoff · Accepted Answer · 2014-03-28 20:27:26Z

0

I've created a GitHub-Gist that does exactly this: https://gist.github.com/Hoff97/7518680

Use jsonWF,objWF for de and encoding.

I've got another Gist that does the same thing more efficiently and is also able to convert cyclic objects: https://gist.github.com/Hoff97/9842228

edited Mar 28, 2014 at 20:27

answered Mar 28, 2014 at 20:18

Hoff

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4 Comments

Ярослав Рахматуллин Over a year ago

Link-only answers are discouraged. Please explain your approach. It seems interesting enough.

Hoff Over a year ago

Ok, so the jsonWF function actually replaces all methods by properties that contain the actual method code. When converting the JSON-string back to an object, all properties containing method code are converted back to methods.

Ярослав Рахматуллин Over a year ago

Um, there seems to be recursion and meta-programing involved (I'm not a fan of either). I'm sure you would get quite a few rep points if you took the time to explain the recursive process of inflating the methods/functions with assignFuncFromStr. I'd gladly vote your answer up if you explained some of the drawbacks with this approach as well as give some examples of where such a solution is reasonable to use.

Hoff Over a year ago

Actually i would recommend using my second approach, because its cleaner and does the same thing way faster.

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