Error accessing object value

Question

I have write this code to access object value in loop but it won't let me access in loop I am getting console error but when I access each value individually I don't get any error.

<!DOCTYPE html>
    <html>
    <head>
    <title></title>
</head>
<body>

<script type="text/javascript">
    var keys;
    var obj = [{"id":"1","firstname":"Aftab","lastname":"Altaf"},{"id":"2","firstname":"Haris","lastname":"Jaliawala"},{"id":"3","firstname":"Muzammil","lastname":"Mumtaaz"}];

    for(key in obj)
    {
        keys = Object.keys(obj[key]);
    }

    console.log(obj[0].firstname);

    for(value in obj)
    {
        console.log(obj[value].keys[value]);
    }

</script>
</body>
</html>

This is the output I am getting in my console. OUTPUT

Aftab
Uncaught TypeError: Cannot read property '0' of undefined

Anyone please help?

obj is an array, doesn't matter if you call it obj, it's still an array, and arrays are iterated with regular for loops, and the iteration only stores the last iteratet keys in the variable keys, not all of them, so it's basically all just wrong. — adeneo
– adeneo, Commented Dec 29, 2013 at 11:07

WebServer · Accepted Answer · 2013-12-29 11:02:38Z

1

inplace of

console.log(obj[value].keys[value]);

use

console.log(obj[value][keys[value]]);

answered Dec 29, 2013 at 11:02

WebServer

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griffon vulture · Accepted Answer · 2013-12-29 11:15:59Z

1

When you want to access a dinamic property of an object in javascript -

you have to use [] and not dot notation.

Thats why you have to use console.log(obj[value][keys[value]]);

edited Dec 29, 2013 at 11:15

answered Dec 29, 2013 at 11:10

griffon vulture

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