Home / Questions / 19625
Accepted
Máxima Alekz
Asked: 2020-08-05 06:32:16 +0800 CST 2020-08-05 06:32:16 +0800 CST

JavaScript - How to know how many elements are in a JSON file

  • 772

I have in my "pck.json"

{
    "Datos":
    [
        {
            "Nombre":"Alekz"
        },
        {
            "Nombre":"Andrea"
        },
        {
            "Nombre":"Janny"
        },
        {
            "Nombre":"Haytham"
        }
    ],
    "Datos2":
    [
        {
            "Nombre":"Alekz"
        },
        {
            "Nombre":"Andrea"
        },
        {
            "Nombre":"Janny"
        },
        {
            "Nombre":"Haytham"
        }
    ],
    "Datos3":
    [
        {
            "Nombre":"Alekz"
        },
        {
            "Nombre":"Andrea"
        },
        {
            "Nombre":"Janny"
        },
        {
            "Nombre":"Haytham"
        }
    ]
}

In JQuery I have

jQuery(document).ready(function($) {
    var obj = $.getJSON('pck.json',function(data){
        var name = data.Datos;
        var cont = 1;
        for (var i = 0; i < name.length; i++) {
            var object = name[i];
            //alert(name.length);
            for (property in object) {
                var valor = object[property];
                $(".unatabla").append("<tr><td>"+cont+"</td><td>"+valor+"</td></tr>");
                cont+=1;
            }
        }
    });
});

How can I count the elements within the JSON, that is, it gives me 3 as a result because in the JSON there are "Data","Data2", and "Data3". Please thanks.

javascript

1 Answers

  1. Best Answer

    Getting the length property of the "keys" object can be done with pure javascript (vanilla):

    Object.keys(data).length;

    For references on this:

    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys

    • 7