& javascript

Hi Guys,
I have a aspx page which contain element that call javascript function:

Here is the example:
 <asp:Button ID="btnClose" runat="server" CssClass="btn btn-default" Text="Close" OnClientClick="javascript:delCookie('hdnMenuIds');delCookie('hdnMenuIdsOld');" visible="false"/>

//javascript function
  function delCookie(name) {          
                document.cookie = name + '=;expires=Thu, 01 Jan 1970 00:00:01 GMT;';

Open in new window

The problem I have with this concept is xss/ cross site vulnerability.
I would like to know if you have any idea to secure this function?

N.B - this function been called by many button in the app so please try giving me solution for the javascript function itself.

Thank you in advance.
Moti Mashiah.NET DeveloperAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Hi Moti,
Are you sure both JavaScript functions are getting called?

I see that button is Visible='false', so it will not render respective html on browser.

Also please share what error you are getting?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Moti Mashiah.NET DeveloperAuthor Commented:
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.