How to unset cookie value in javascript?

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C#

Here is my function to unset cookie.

HTML

<a href="#" onclick="removeCookie();"><input type="submit" value="Log Out" style="cursor:pointer;"/></a>

JavaScript

function removeCookie() {  //Logout

    var str = document.cookie;
    var username = str.replace(/(?:(?:^|.*;\s*)username\s*\=\s*([^;]*).*$)|^.*$/, "$1"); 
    if (username) {
        document.cookie = "username=NULL";        
        alert(username);        
        if (username == 'NULL') {            
            window.location.href = 'login.html';
        }
    }
}

C#

For the first time the value of the cookie is not being set to "NULL". Its working for the second time button click. Please show me if there is any error.Please help me .Thank you in advance.

Posted 17-Dec-15 0:36am

Sradhanjali Behera

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F-ES Sitecore 17-Dec-15 6:42am

For the first click does it go into your "if" section? ie does "username" evaluate to true? Use the "debugger;" keyword to help debug your code using the browser's dev tools, google for instructions on how to do this if needed.

Sradhanjali Behera 17-Dec-15 6:49am

Its not working for the first time ,means for the first time it is not going into if condition @F-ES Sitecore

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Peter Leow · Accepted Answer · 2015-12-17T01:47:00

Solution 1

To remove a cookie, just set its expires parameter to a passed date:

C#

document.cookie = "username=; expires=Thu, 01 Jan 1970 00:00:00 UTC";