Using cookies to transfer numeric variables

Question

This is my code:

var j = 0;
var c = 0;
var riepvet = new Array();

function controllo() {

    if ((src1 == "") || (src1 == "undefined")) {
        alert("Selezionare un'immagine.");
    }
    else if(j==0) {
        riepvet[c] = src1;
        c++;
        for (var k = 0; k < c; k++) {
            alert(riepvet[k]);
        }
        location.href = "schienale.html";
        j++;

    }
    else if (j==1){
        riepvet[c] = src1;
        c++;
        for (k = 0; k < c; k++) {
            alert(riepvet[k]);
        }
        location.href = "riep.html";
        j++;
    }
}

What I need, is make the numeric variables j and c available through all the pages of my program. Is this possible using cookies (since they aren't string but numbers)?

I've already tried to use eval() but it seems not to work.

Any suggestions?

Edit:

 Cookies.set('j', 0);
var j = parseInt(Cookies.get('j'));

Cookies.set('imuno');
var imuno = Cookies.get('imuno');
Cookies.set('imdue');
var imdue = Cookies.get('imdue');

function controllo() {

    if ((src1 == "") || (src1 == "undefined")) {
        alert("Selezionare un'immagine.");
    }
    else if (j == 0) {
        imuno = src1;
        Cookies.set('imuno', src1);
        alert(imuno);
        location.href = "schienale.html";
        j++;
        Cookies.set('j', 1);

    }
    else if (j == 1) {
        imdue = src1;
        Cookies.set('imdue', src1);
        alert(imuno,imdue);
        location.href = "riep.html";
        j++;
        Cookies.set('j', 2);
    }
}

When i retrieve the function Controllo() the variable jdoes not mantain the value.

*"since they aren't string but numbers"* - Numbers *can* be formatted as strings. And later turned back into numbers... — nnnnnn, Feb 25 '16 at 10:03
http://stackoverflow.com/questions/14573223/set-cookie-and-get-cookie-with-javascript — mplungjan, Feb 25 '16 at 10:04

score 1 · Answer 1 · answered Feb 25 '16 at 10:02

1

Are many ways to achieve that .

You can use cookies

Use a cookie for each key-value you want to store:

document.cookie = "myCookie=myValue";
document.cookie = "myOtherCookie=myOtherValue";

Store a single cookie with a custom serialization of your complex data, for example JSON:

document.cookie = "myCookie=" + JSON.stringify({foo: 'bar', baz: 'bar'});

or

you can use localStorage

localStorage.setItem('myvariable', 'myvalue');

answered Feb 25 '16 at 10:02

Vladu Ionut

8,075
1
19
30

Unfortunately, i dont know JSON, can i proceed anyway? – Francesco Monti Feb 25 '16 at 10:18

Zakaria Acharki · Accepted Answer · 2016-02-25T10:29:55.960

1

Yes, you could use cookies, i suggest js-cookie.

Create a cookie :
```
Cookies.set('name', 'value');
```
Read cookie :
```
Cookies.get('name'); // => 'value'
```

You could store you numbers as strings then cast them after get, e.g:

Cookies.set('j', j);  //Set j
j = parseInt( Cookies.get('j') );  //Get j

Example :

Cookies.set('j', 1); //Set j
var j = parseInt( Cookies.get('j') );  //Get j

if( j == 0 ){
    alert('Yes j == 0');
}else{
    alert('No j == '+j);
}

Hope this helps.

edited Feb 25 '16 at 10:29

answered Feb 25 '16 at 10:04

Zakaria Acharki

66,747
15
75
101

Thank for your answer. Just few questions: once i create the cookie can i use just the variable to do for example comparisons? (if(j == 0) or j++)? If yes, when a variable increases, does the cookie update the new value? Hope i explaned well, im new to this :) – Francesco Monti Feb 25 '16 at 10:20
Yes, if you're using `parseInt` like mentioned in my post. – Zakaria Acharki Feb 25 '16 at 10:23
Can u give me an example? Thanks! – Francesco Monti Feb 25 '16 at 10:26
1

Last question, if I increase a variable (like j++), does the cookie update itself to the new value? – Francesco Monti Feb 25 '16 at 10:32
1

No, it's not you should update the cookies using `set`, Cookies.set('j', new_value). – Zakaria Acharki Feb 25 '16 at 10:34
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/104524/discussion-between-zakaria-acharki-and-francesco-monti). – Zakaria Acharki Feb 25 '16 at 11:14

Using cookies to transfer numeric variables

2 Answers2