RealTime Collaborative Text-Editor in Nodejs & Socket.io

Question

I am developing a real-time text editor with paragraph locking property similar to https://quip.com/. in socket.io and nodejs

Answer 1

I saw this yesterday already. What exactly is your question? Do you want to know how to 'lock' a text area with javascript? I am confused as to why you put such a strong emphasis on node/socket.io in your question.

Also, next time please format your code. You want help, I get it, but then make it easier for others to help you.

What you have to do in order to make a paragraph not editable by others, I don't know. But let me suggest what I'ld do in socket.io:

Store each paragraph separately and remember who has a lock on it. For locking, I would use the sessionID in case users don't have to register. This would look something like this:

var paragraphs = {
    data : [
        {
            text: "this is an unlocked paragraph",
            lock: ""
        },
        {
            text: "this is a locked paragraph",
            lock: "oWEALlLx5E-VejicAAAC"
        }
    ]
}

Now, users will likely be allowed to add a paragraph before an existing one. Therefore you should keep an additional index like:

var paragraphs = {
    index : [
        1,
        0
    ],
    data : [
        {
            text: "this the second paragraph",
            lock: "oWEALlLx5E-VejicAAAC"
        },
        {
            text: "this is the first paragraph",
            lock: ""
        }
    ]
}

The amount of data being sent over the sockets should now be very small - altough with additional client/server-side logic.