Question

134

How to increment a value at localStorage

rated 0 times [ 136] [ 2] / answers: 1 / hits: 17096 / 12 Years ago, sat, july 7, 2012, 12:00:00

I have some values that are dynamically stored at localStorage with incremented values like this: localStorage[Value0], localStorage[Value1],....

When I try to access them like this:

JavaScript:

localStorage[Counter]=0;

var i = localStorage[Counter]; 

var d =localStorage[Value+i];

i = i + 1; // i becomes 01

var f = localStorage[Value+i];

The i's value is 01 not 1 ... Is there a way to increment the i's value correctly?

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mariamiyanab

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2 Years ago

answered 12 Years ago eanskylerg · Accepted Answer

LocalStorage can only store string values. You can use parseInt which converts a string into an integer:

var new_value =  parseInt(localStorage.getItem('num')) + 1

You can also use libraries like store.js to do things automatically for you. All you have to do is to include the library:

<script src=store.js></script>

Set a new storage:

var numbers = new Store(numbers)

Put things into it:

numbers.set('num', 2)

Get the value and do anything you want with it:

numbers.get('num') + 1 //output: 3

And you can also go crazy and use some arrays:

numbers.set('nums', [1,2,3])

And change things inside it:

numbers.get('nums')[0] + 3 //output: 4

No type conversion needed. You can also store objects, booleans and other stuff. Just don't forget to save things back in the storage since it doesn't automatically do it.