Question

173

How to delete data from the javascript object from this data structure?

rated 0 times [ 176] [ 3] / answers: 1 / hits: 18524 / 13 Years ago, mon, january 23, 2012, 12:00:00

I need to read all the connection times. (connectionTimes)
I need to delete the line - when it will be offline more than online:

    userId: 1,

    connectionTimes:

        [

            {onlineTime:11:10:30, offlineTime:11:18:12}, //delete

            {onlineTime:11:14:14, offlineTime:11:52:41}  //delete

        ]

Delete user id - When times the connection will be empty.

 userId: 1, //delete userid

        connectionTimes:

            [

                //empty connection

            ]

I have this data structure:

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}

            ]

    }

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jameson

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4 Years ago

answered 13 Years ago makaylahk · Accepted Answer

You can delete a property from an JavaScript object with the delete operator:

var sampleObject = {

    key1: value1,

    key2: value

};

delete sampleObject[key2];

or like this:

delete sampleObject.key2

See the Mozilla Developer Network JavaScript Reference for more background on the delete operator:
https://developer.mozilla.org/en/JavaScript/Reference/Operators/delete

Your specific example would look something like this:

for(var id in users) {

    var user = users[id];

    if (user.connectionTimes.length === 0) {

        delete users[id];

        break

    }



    for(var i=0; i<=user.connectionTimes.length; i++) {

        var connectionTime = user.connectionTimes[i];

        if (connectionTime.onlineTime < connectionTime.offlineTime) {

            delete users[id];

            break;

        }

    }

}

Here is a link to jsFiddle showing the code in action:
http://jsfiddle.net/Q86Jd/