How to make a JSON array inside an array

Question

first post ever here

I'm trying to replicate this sort of JSON object so that I can store it inside localStorage with stringify:

I want to be able to create a new noteState inside of history whenever an event is caught but do not know necessarily how to go about doing so..

var history = {
    "noteState1": [
        {created: new Date(),
        modified: new Date(),
        left: "100",
        top: "200",
        text: "hello"},

        {created: new Date(),
        modified: new Date(),
        left: "150",
        top: "250",
        text: "new"},

        {created: new Date(),
        modified: new Date(),
        left: "200",
        top: "300",
        text: "world"}
    ], 
    "noteState2": [
        {created: new Date(),
        modified: new Date(),
        left: "100",
        top: "200",
        text: "hello"},

        {created: new Date(),
        modified: new Date(),
        left: "150",
        top: "250",
        text: "new"},

        {created: new Date(),
        modified: new Date(),
        left: "200",
        top: "300",
        text: "world"}
    ]
}

how can i create a new member with a single array inside history?

look at the JSON.parse and JSON.stringify methods.

frenchie
– frenchie

2012-02-14 21:53:58 +00:00
Commented Feb 14, 2012 at 21:53 — frenchie
– frenchie, Commented Feb 14, 2012 at 21:53

Marc B · Accepted Answer · 2012-02-14 21:52:19Z

5

You don't modify the json string - that's too risky. Instead you convert it back to a native javascript array/object, use the regular array push/pop type operators on it, then convert back to a json string.

answered Feb 14, 2012 at 21:52

Marc B

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RestingRobot · Accepted Answer · 2012-02-14 21:53:51Z

0

Why can't you just maintain your history as an array of objects and then add a new noteState? When you want to store you're array, simply insert each of the noteStates in the history array into a JSON object.

answered Feb 14, 2012 at 21:53

RestingRobot

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Kristian · Accepted Answer · 2012-02-14 21:56:14Z

0

before you do anything, convert those json strings to objects. By doing that, you can easily just add namespaces to history like this:

history.noteStateX = { x:1,y:2 };

and now history has that property as well as the others.

answered Feb 14, 2012 at 21:56

Kristian

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