Length of a JSON object

Question

This function is generating a array with json objects on it:

var estoque={};
function unpack_estoque(tnm,total,estoque_vl,id,tid,st) {
    tnm=tnm.split("|");
    total=total.split("|");
    estoque_vl=estoque_vl.split("|");
    id=typeof id != 'undefined' ? id.split("|") : null;
    tid=typeof tid != 'undefined' ? tid.split("|") : null;
    st=typeof st != 'undefined' ? st.split("|") : null;

    for (var i in tnm)
        estoque[i]={
            "id": id != null ? id[i] : null,
            "tid": tid != null ? tid[i] : null,
            "total": total[i],
            "estoque": estoque_vl[i],
            "tnm": tnm[i],
            "st": st != null ? st[i] : null
        };
}

Now how do i get the estoque length to loop through the collected items?

estoque.length returns undefined while for (var i in estoque) loops through JSON object and not estoque[] root array.

Thanks.

Forget all those complex methods, use this: `Object.keys(estoque).length` — Derek 朕會功夫, Apr 29 '12 at 03:21
Great method Derek! Though, let it be noted that this method isn't compatible with IE 8. — Eric Keyte, Jun 02 '15 at 20:06

score 2 · Accepted Answer · edited Apr 03 '11 at 23:29

var estoque = {}; //object estoque.length will not work (length is an array function)
var estoque = new Array(); //estoque.length will work

You could try:

 var estoque = new Array();
 for (var i in tnm)
    estoque.push({
        "id": id != null ? id[i] : null,
        "tid": tid != null ? tid[i] : null,
        "total": total[i],
        "estoque": estoque_vl[i],
        "tnm": tnm[i],
        "st": st != null ? st[i] : null
    });

Now estoque will be an array (which you can traverse as one).

score 1 · Answer 2 · answered Jan 19 '15 at 10:58

1

a={a:{},b:{},c:{}}
Object.keys(a).length
3

answered Jan 19 '15 at 10:58

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John · Answer 3 · 2010-07-13T22:12:02.757

1

You will not get that to work as it is an array method, not an object. You can use the length property of tnm as your measure. Then you can you can use:

var tnmLength = tnm.length;
for (i=0, i>tnmLength - 1; i++) {
     estoque[tnm[i]] = {};
}

To loop through all of the items in the tnm array.

edited Jul 13 '10 at 22:12

answered Jul 13 '10 at 21:58

John

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Length of a JSON object

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