JSON array get length using jQuery or javascript

Question

I know there are many similar questions to this. But any of them doesn't work for me.

I have a json array which the whole structure is like this:

enter image description here

The array the i want to get is this:

enter image description here

The structure of that json array is:

enter image description here

I want to get the length of that json array. In the image case above it is 4. What I tried so far is this:

console.log( $( data.studentMockBeanMap ).size() );
console.log( $(data.studentMockBeanMap ).length );.

Which both returns 1

I also try this one:

var x = JSON.stringify(data.studentMockBeanMap);
console.log( x.length );

Which returns 2257, which IMO it also returns the sum of all json object.

How can I only the size on the image i boxed above?

That's not an array, that's an object with several properties. This answer may help you: stackoverflow.com/questions/126100/… — EfrainReyes
– EfrainReyes, Commented Dec 28, 2013 at 5:25
@EfrainReyes I see. Is there another way than the link you gave? the solution there doesn't support lower version of browser like FF3 that is quite a toll. — newbie
– newbie, Commented Dec 28, 2013 at 5:35
The marked answer in particular is for newer browsers, but did you check the other answers on that link, and the corresponding comment threads? — EfrainReyes
– EfrainReyes, Commented Dec 28, 2013 at 5:41
By the way, check out this link as well, that approach may work with older browsers: stackoverflow.com/a/11369971/2563028 — EfrainReyes
– EfrainReyes, Commented Dec 28, 2013 at 5:41

Josh Beam · Accepted Answer · 2013-12-28 05:57:15Z

8

This does the same think as Object.keys(obj).length, but without the browser compatibility issue (I think).

What about:

var obj = {
    yo: {
         a: 'foo',
         b: 'bar'
    }
    hi: {
        c: 'hello',
        d: 'world',
        e: 'json'
    }
}

var arr = [], len;

for(key in obj) {
    arr.push(key);
}

len = arr.length;

console.log(len) //2

OR

var arr = [], len;

for(key in obj.hi) {
    arr.push(key);
}

len = arr.length;

console.log(len) //3

OR, in your case

var arr = [], len;

for(key in studentMockBeanMap) {
    arr.push(key);
} 

len = arr.length;

console.log(len); //4

answered Dec 28, 2013 at 5:57

Josh Beam

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1 Comment

newbie Over a year ago

Ah yes. This is what I did just now. Thanks for you help.

Shanimal · Accepted Answer · 2018-01-05 04:05:32Z

0

You can also use the lodash library (which has a size function).

http://lodash.com/docs#size

_.size({red: 'red', blue: 'blue'}) // 2

edited Jan 5, 2018 at 4:05

answered Dec 28, 2013 at 6:54

Shanimal

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