How create and read javascript object for save the following data structure?

Question

I need to create the following data structure:

userid, onlinetime, offlinetime

I need the user id to be repeated in the list.

Something like this:

userid: 1, onlinetime: 11:10:30, offlinetime: 11:18:12
userid: 1, onlinetime: 11:14:14, offlinetime: 11:52:41
userid: 2, onlinetime: 8:08:14, offlinetime: 1:15:00

How can I create this object, or a list?

How can I read this object or list? (I need to compare on-line and off-line time.)

How is represented the data at first ? You generate it from server-side, you get it from forms elements, or request json... ? — Didier Ghys
– Didier Ghys, Commented Jan 22, 2012 at 13:46
Create an object from a javascript function. The function returns the user id, online time, offline time. — Jenan
– Jenan, Commented Jan 22, 2012 at 13:47
From your example, it seems a single user can have multiple online and offline times. Also, it would make more sense to have a connectionTimes array, which will contain online and offline times. This can be a part of an object with a userID property. — Abbas
– Abbas, Commented Jan 22, 2012 at 13:50
@Abbas This is a good solution. Can you give me an example please? — Jenan
– Jenan, Commented Jan 22, 2012 at 13:52

Abbas · Accepted Answer · 2012-01-22 15:37:05Z

2

You can create User objects with userId and connectionTimes properties and add them to an array of Users like this:

function createUsers()
{
    var users = [];

    users[0] = {
        userId: 1,
        connectionTimes:
            [
                {onlineTime:"11:10:30", offlineTime:"11:18:12"},
                {onlineTime:"11:14:14", offlineTime:"11:52:41"}
            ]
    }

    users[1] = {
        userId: 2,
        connectionTimes: 
            [
                {onlineTime:"8:08:14", offlineTime:"1:15:00"}
            ]
    }   

    return users;
}

Once you have an array of users, you can iterate through it and find a user by comparing the userId property:

var users = createUsers();

for (var i=0;i<users.length;i++)
{
    if (users[i].userId === 2)
    {
        for (var j=0;j<users[i].connectionTimes.length;j++)
        {
            alert("onlineTime: " + users[i].connectionTimes[j].onlineTime + ", " + "offlineTime: " + users[i].connectionTimes[j].offlineTime);
        }   
    }
}

EDIT

Here's a decomposed version of the code, based on a createUser and getConnectionTime function:

function getConnectionTime(onTime, offTime)
{
    return {onlineTime: onTime, offlineTime: offTime};
}

function createUser(uid, connTimes)
{
    return {userId: uid, connectionTimes: connTimes};
}

var users = [];

var connTimes = [];
connTimes.push(getConnectionTime("11:10:30", "11:18:12"));
connTimes.push(getConnectionTime("11:14:14", "11:52:41"));
users.push(createUser(1, connTimes));

connTimes = [];
connTimes.push(getConnectionTime("8:08:14", "1:15:00"));
users.push(createUser(2, connTimes));

for (var i=0;i<users.length;i++)
{
    if (users[i].userId === 2)
    {
        for (var j=0;j<users[i].connectionTimes.length;j++)
        {
            alert("onlineTime: " + users[i].connectionTimes[j].onlineTime + ", " + "offlineTime: " + users[i].connectionTimes[j].offlineTime);
        }   
    }
}

edited Jan 22, 2012 at 15:37

answered Jan 22, 2012 at 14:01

Abbas

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10 Comments

Jenan Over a year ago

When I need to generate userid and times dynamically. How I can read the time from the user with id 2?

Jenan Over a year ago

This is very good! Could you please show me: How to dynamically generate this object? :

users[0] = {         userId: 1,         connectionTimes:              [                 {onlineTime:"11:10:30", offlineTime:"11:18:12"},                 {onlineTime:"11:14:14", offlineTime:"11:52:41"}             ]     }

Abbas Over a year ago

The createUser function cannot have onlinetime and offlinetime parameters since a single user can have more then 1 pair of online and offline time. This is what I think the create user function should look like: function createUser(userid, connectionTimes) { ... }. I will update my answer and break down the object into functions.

Abbas Over a year ago

users[0].connectionTimes.push(getConnectionTime("00:00:00", "00:00:01"))

Abbas Over a year ago

I was just giving an example. You will have to search it as I have demonstrated in the code above. The condition would be: if (users[i].userId === 1).

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