Deleting particular data from a json object using JavaScript

Question

I am using titanium for developing Android application. I want to delete some data from json object. My json object given below:

{"feeds":
[
    {"username":"abc","user":"abc","feed":{"description":"dss","id":660,"user_id":1}},
    {"username":"bcd","user":"bcd","feed":{"description":"dddd","id":659,"user_id":1}}
]
}

for receiving json object I used following code

var json = this.responseText;
var json = JSON.parse(json);
json.feeds.splice(0,1);
alert(json.feeds[0]);

I want to delete particular data from json object like json.feeds[0] using JavaScript. I am able to access json.feeds[0] but not able to delete. Is there any way to delete that data from json object using JavaScript?

Li0liQ · Accepted Answer · 2011-10-08 10:04:10Z

3

You are using splice to properly remove an element from a javascript array:

json.feeds.splice(0,1)

Using the code you've provided it will look like:

(function(){
    var json = {
        "feeds": [
            {"username":"abc","user":"abc","feed":{"description":"dss","id":660,"user_id":1}},
            {"username":"bcd","user":"bcd","feed":{"description":"dddd","id":659,"user_id":1}}
        ]
    };

    json.feeds.splice(0,1);
    console.log(json.feeds); // just to check that "feeds" contains only a single element
})();

edited Oct 8, 2011 at 10:04

answered Oct 8, 2011 at 8:52

Li0liQ

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6 Comments

nilkash Over a year ago

thank u for quick replay. I tried this but it not working.it not deleting data from json object. I also tried delete json.feeds[0] but that also not working

Li0liQ Over a year ago

I've updated the answer with a working snippet based on your input. Is it what you are actually want to achieve?

nilkash Over a year ago

thank you for reply.I have updated my code in question.plz check it's not working as required.

Li0liQ Over a year ago

Actually, it is. As your array in question contains two elements, after deleting the first one, the second one is shifted and becomes the first. I.e. initially you have json.feeds[0] and json.feeds[1], after splice the first one is deleted and the second one is shifted. That still allows you to access json.feeds[0], however, that will be the element that was initially the second. The first one has gone. You'd better check json.feeds.length for array length before and after splice operation.

nilkash Over a year ago

You are telling as I required.But after splice it showing me 0th position element not 1st position element and also not changing length.i.e. it remain 2. is there any problem in my json object? I can also modify the field in the data but only can't delete it.

|

Quentin · Accepted Answer · 2011-10-08 08:52:04Z

3

Parse the JSON into a JavaScript data structure
Use splice to remove the elements you don't want from the array
Serialise the JavaScript objects back into JSON

answered Oct 8, 2011 at 8:52

Quentin

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