Jquery get length of json array

Question

I've an issue with a json array row length...

I want to extract the correct length of data-row json (in this case "2")... If I try to count the length I get the value "1". Why ? How can I get the correct length ?

{
    "data-row": {
        "data1": [{
            "firstName": "John",
            "lastName": "Doe"
        }, {
            "firstName": "Anna",
            "lastName": "Smith"
        }, {
            "firstName": "Peter",
            "lastName": "Jones"
        }],
        "data2": [{
            "firstName": "John",
            "lastName": "Doe"
        }, {
            "firstName": "Anna",
            "lastName": "Smith"
        }]
    }
}

How did you try to count the length?

choz
– choz

2016-01-21 09:40:53 +00:00
Commented Jan 21, 2016 at 9:40 — choz
– choz, Commented Jan 21, 2016 at 9:40
try Object.keys(jsondata.data-row).length

Parth Trivedi
– Parth Trivedi

2016-01-21 09:41:08 +00:00
Commented Jan 21, 2016 at 9:41 — Parth Trivedi
– Parth Trivedi, Commented Jan 21, 2016 at 9:41
Please paste your code, how you count the length.

Jasbeer Singh
– Jasbeer Singh

2016-01-21 09:42:54 +00:00
Commented Jan 21, 2016 at 9:42 — Jasbeer Singh
– Jasbeer Singh, Commented Jan 21, 2016 at 9:42

Parth Trivedi · Accepted Answer · 2016-01-21 09:53:27Z

3

You have a Object and to find length of Object

var json = {
  "data-row": {
    "data1": [],
    "data2": []
  }
}


alert(Object.keys(json["data-row"]).length);

As you are having - in key use json["data-row"] to access object

edited Jan 21, 2016 at 9:53

answered Jan 21, 2016 at 9:42

Parth Trivedi

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2 Comments

Anoop Joshi P Over a year ago

can you create a demo for this?

Parth Trivedi Over a year ago

@AnoopJoshi i have created.

Ankit Kathiriya · Accepted Answer · 2016-01-21 10:01:00Z

1

This is the another way to find length. but not right way.

var json = {
  "data-row": {
    "data1": [],
    "data2": []
  }
}
length=0;
$.each(json["data-row"],function(i){
  length++;
});
alert(length);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>

answered Jan 21, 2016 at 10:01

Ankit Kathiriya

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