What is the method for utilizing document.cookie to save and access data in an array structure?

Question

What is the method for utilizing document.cookie to save and access data in an array structure?

Currently, I have successfully implemented methods to store and retrieve values in cookies:

function setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays*24*60*60*1000));
    var expires = "expires="+ d.toUTCString();
    document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
};

as well as

function getCookie() {
    var name = "name=";
    var decodedCookie = decodeURIComponent(document.cookie);
    var ca = decodedCookie.split(';');
    for(var i = 0; i <ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') {
            c = c.substring(1);
        }
        if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
        }
    }
    return "";
};

Now, my next challenge is to handle storing/retrieving arrays in a similar manner. It seems logical to convert the array into a single string before storage and then parse it back when retrieving, but what would be the most efficient way to accomplish this?

javascript arrays cookies

Answer 1

Answer №1

My suggestion would be to utilize JSON. The initial step involves transforming the array into a JSON string:

let myArray = ["apple", "banana", "orange"];
let jsonString = JSON.stringify(myArray);

Next, store the JSON string as the value of the cookie.

setCookie("myArray", jsonString, expirationDays);

Then, when you need to retrieve the JSON string from the cookie in the future, convert it back into an array.

let storedJsonString = getCookie("myArray");
let newArray = JSON.parse(storedJsonString);

Answer 2

My suggestion would be to utilize JSON. The initial step involves transforming the array into a JSON string:

let myArray = ["apple", "banana", "orange"];
let jsonString = JSON.stringify(myArray);

Next, store the JSON string as the value of the cookie.

setCookie("myArray", jsonString, expirationDays);

Then, when you need to retrieve the JSON string from the cookie in the future, convert it back into an array.

let storedJsonString = getCookie("myArray");
let newArray = JSON.parse(storedJsonString);

Answer 3

Answer №2

Suppose you are looking to manage multiple cookies for storage or retrieval. Your current function "getCookies()" almost accomplishes this:

function getCookies() {
var decodedCookie = decodeURIComponent(document.cookie);
var ca = decodedCookie.split(';');
return ca.map(function(c){
    while (c.charAt(0) == ' ') {
        c = c.substring(1);
    }
        return c.split("=");
    }
});
};

The adjustment needed is to retrieve all cookies instead of just the first one and eliminate name detection.

console.log(getCookies());

To set cookies:

function setCookies(Cookies, exp){
 Cookies.forEach(function(el){setCookie(el[0], el[1], exp);});
}

setCookies([
  ["name", "value"]
 ]);

Answer 4

Suppose you are looking to manage multiple cookies for storage or retrieval. Your current function "getCookies()" almost accomplishes this:

function getCookies() {
var decodedCookie = decodeURIComponent(document.cookie);
var ca = decodedCookie.split(';');
return ca.map(function(c){
    while (c.charAt(0) == ' ') {
        c = c.substring(1);
    }
        return c.split("=");
    }
});
};

The adjustment needed is to retrieve all cookies instead of just the first one and eliminate name detection.

console.log(getCookies());

To set cookies:

function setCookies(Cookies, exp){
 Cookies.forEach(function(el){setCookie(el[0], el[1], exp);});
}

setCookies([
  ["name", "value"]
 ]);

What is the method for utilizing document.cookie to save and access data in an array structure?

Answer №1

Answer №2

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