How can I delete all cookies with Javascript?

Question

I have written code to save the cookies in Javascript. Now I need to clear the cookie irrespective of values that I assigned.

Are there any script modules to delete all cookies that were generated by javascript?

My Sample Code:

 document.cookie = 'ppkcookie2=another test; expires=Fri, 3 Aug 2001 20:47:11 UTC; path=/'

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

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

function eraseCookie(name) {
    createCookie(name,"",-1);
}

How else could I clear all of the cookies?

Will there will be any problems when I test the code on the webserver?

Answer 1

But on the face of it it looks OK - if you call your eraseCookie() on each of the cookies that you read from document.cookie, then all the cookies would be gone.

Maybe something like this:

var cookies = document.cookie.split(";");
for (var i = 0; i < cookies.length; i++)
  eraseCookies(cookies[i].split("=")[0]);

All this with caveat:

• You can only remove cookies created by JavaScript - if a cookie was create by the server, then you cannot remove it through JavaScript.

Answer 2

If you want to delete all the cookies, why not simply do

document.cookie = "";

Answer 3

There is no 100% solution to delete browser cookies.

The problem is that cookies are uniquely identified by not just by their key "name" but also their "domain" and "path".

Without knowing the "domain" and "path" of a cookie, you cannot reliably delete it. This information is not available through JavaScript's document.cookie. It's not available through the HTTP Cookie header either!

However, if you know the name, path and domain of a cookie, then you can clear it by setting an empty cookie with an expiry date in the past, for example:

function clearCookie(name, domain, path){
    var domain = domain || document.domain;
    var path = path || "/";
    document.cookie = name + "=; expires=" + +new Date + "; domain=" + domain + "; path=" + path;
};

Answer 4

Reads, writes and deletes current Web page's cookies

http://java.pakcarid.com/Cpp.aspx?sub=385&ff=3043&topid=40&sls=25