How do I get a value from this localStorage array to create a new var?

Question

Here is the localStorage entry I want to use:

Key: file

Value: [{"id":"usethis","somethingelse":"otherstuff"}]

I want to create a var from id in the Value array so I can make an if that says:

var idvalue = ??? (...this is what I need help retrieving...)

if (idvalue == "usethis") { ...do some stuff... } else { ...do something else... }

Arun P Johny · Accepted Answer · 2013-10-28T03:34:54.187

1

Try

//read the string value from localStorage
var string = localStorage.getItem('file');
//check if the local storage value exists
if (string) {
    //if exists then parse the string back to a array object and assign the first item in the array to a variable item
    var file = JSON.parse(string),
        item = file[0];
    //check whether item exists and its id is usethis
    if (item && item.id == "usethis") {} else {}
}

edited Oct 28 '13 at 03:34

answered Oct 28 '13 at 02:59

Arun P Johny

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Thanks but there seems to e a syntax error in there somewhere. Can't paste the example without an error on line with second if. – user1452893 Oct 28 '13 at 03:33
@user1452893 there was a `=` missing – Arun P Johny Oct 28 '13 at 03:36
Thanks so much for going the extra mile for me! That example is very helpful and helps me learn. – user1452893 Oct 28 '13 at 03:40
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/40085/discussion-between-user1452893-and-arun-p-johny) – user1452893 Oct 28 '13 at 03:48

score 1 · Answer 2 · edited May 23 '17 at 11:57

1

HTML5 Local Storage only handles string key/value pairs. To save your JSON object in Local Storage you will have to stringify it when you save it, and parse the string when you read it back. It is all explained very well in the following StackOverflow question Storing Objects in HTML5 localStorage.

edited May 23 '17 at 11:57

Community

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1

answered Oct 28 '13 at 03:02

Daniel Bank

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Thanks looks like there are a lot af competing examples in there. I just want one that works. – user1452893 Oct 28 '13 at 03:35

How do I get a value from this localStorage array to create a new var?

2 Answers2