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Home Interviews How can you check if a user has accepted cookies before storing them? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 10 Mar 2025
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You can check if a user has accepted cookies before storing them using JavaScript by:

  1. Checking for an existing consent cookie – If the user has already accepted cookies, a consent cookie should be stored.
  2. Displaying a consent banner if needed – If no consent cookie is found, prompt the user to accept cookies.
  3. Storing the user's consent – Once the user accepts, store their consent in a cookie.

Example Implementation:

function getCookie(name) {
    const cookies = document.cookie.split("; ");
    for (let cookie of cookies) {
        let [key, value] = cookie.split("=");
        if (key === name) return value;
    }
    return null;
}

function setCookie(name, value, days) {
    let expires = "";
    if (days) {
        let date = new Date();
        date.setTime(date.getTime() + days * 24 * 60 * 60 * 1000);
        expires = "; expires=" + date.toUTCString();
    }
    document.cookie = name + "=" + value + "; path=/" + expires;
}

// Check if consent is already given
if (!getCookie("cookieConsent")) {
    // Show consent banner
    document.getElementById("cookie-banner").style.display = "block";
}

// Handle consent
document.getElementById("accept-cookies").addEventListener("click", function () {
    setCookie("cookieConsent", "true", 365); // Store consent for 1 year
    document.getElementById("cookie-banner").style.display = "none";
});

HTML for Cookie Banner:

<div id="cookie-banner" style="display:none; position:fixed; bottom:0; background:#333; color:#fff; padding:10px; width:100%;">
    This site uses cookies. <button id="accept-cookies">Accept</button>
</div>
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