Adding localstorage array

Question

I'm having hard time on this localstorage array. I have search it here but can't get it out. Hope you can help me with this one.

Here is my code.

$(function(){
    var addWishlist = $('.add-wishlist');
    addWishlist.click(function(e){
        e.preventDefault();
        var product_ids = [];
        localStorage.setItem('product_ids', $(this).prev().val() );
        console.log( localStorage.getItem('product_ids') );
    });
});

The output is:

The output should be [2, 3, 4, 1]

<input type="hidden" value="{{ $product->id }}" name="product_id">`That is the prev of add to wishlist. — Rbex
– Rbex, Commented Oct 13, 2016 at 1:52
Everytime I click the wishlist button it will give you a number. That is an i.d.. It should be save in array. — Rbex
– Rbex, Commented Oct 13, 2016 at 1:54

Sajeetharan · Accepted Answer · 2016-10-13 02:01:05Z

1

You need to add it to array on button click and then store it to local storage. Also product_ids should be initialized outside the click event

var product_ids = [];
addWishlist.click(function(e){
        e.preventDefault();      
        product_ids.push($(this).prev().val())
        localStorage.setItem('product_ids',product_ids );
        console.log(localStorage.getItem('product_ids') );
    });

edited Oct 13, 2016 at 2:01

answered Oct 13, 2016 at 1:56

Sajeetharan

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5 Comments

Sajeetharan Over a year ago

@Rbex did you declare the product_ids outside the button click?

Rbex Over a year ago

It works now. Thanks for reminding that one but the output is 2, 3, 4. Can I convert it to array? I'm happy if you can answer it as well but I can search it how. Thanks.

Sajeetharan Over a year ago

@Rbex It is already an array anyway. just do a console log and check console.log(product_ids) , mark as answer if it has helped

Rbex Over a year ago

You are a rockstar! Thank you so much @Sajeetharan.

nnnnnn Over a year ago

localStorage can only store strings. If you want to store an array the simplest way is to convert it to/from JSON when you set/get it. If you're going to use a separate array variable as well as local storage then on page load you'll need to populate that array with whatever is currently in local storage, otherwise the code above will delete values from the previous session.

Community · Accepted Answer · 2020-06-20 09:12:55Z

There a couple of things wrong:

The array product_ids is always empty because you need to push() or unshift(), or anything to fill the array.
localStorage can only take strings, I don't even think it will even recognize your empty array.

Changes

Added an extra button to load the data into localStorage
Text is entered then click the Add button.
The value of the text input is push()ed into the array productList.
Each time productList is updated, it is stored in a hidden input #cache
When the Done button is clicked, the value of #cache is converted into a string by JSON.stringify.
Once productList is a string, it is then stored in localStorageand is displayed in #output.

Due to SO sandbox, the Snippet doesn't work, so review this PLUNKER instead.

SNIPPET

<!DOCTYPE html>
<html>

<head>

</head>

<body>

  <fieldset>
    <legend>wishList</legend>
    <input id='in1'>
    <button><a href='#' id='add'>Add</a>
    </button>
    <button><a href='#' id='done'>Done</a>
    </button>
    <label for='out1'>wishList:</label>
    <output id='out1'></output>
    <input id='cache' type='hidden'>
  </fieldset>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
  <script>
    $(function() {
      var productList = [];
      $('#add').on('click', function(e) {
        e.preventDefault();
        var productItem = $('#in1').val();
        productList.push(productItem);
        $('#cache').val(productList);
      });
      $('#done').on('click', function(e) {
        e.preventDefault();
        var cached = $('#cache').val();
        var str = JSON.stringify(cached);
        localStorage.setItem('proList', str);
        var stored = localStorage.getItem('proList');
        console.log(stored)
        $('#out1').html(stored);
      });
    });
  </script>
</body>

</html>

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