How to call javascript function on click of a link?

Question

When I click on Logout link, my logout.php file is called which logs me out.

<a href=logout.php>Logout</a>

How can I call following javascript function before calling the logout.php file on the click of the Logout link.

Javascript function

function callMeBeforeLogout()
{
    alert("Do you really want to logout?");
}

You have to add onclick event handler: <a href=logout.php onclick="callMeBeforeLogout()"> — hindmost
– hindmost, Commented Apr 5, 2014 at 6:59
Add onclick event and for href you may want to use javascript:;. — Fr0zenFyr
– Fr0zenFyr, Commented Apr 5, 2014 at 7:01

Mulan · Accepted Answer · 2014-04-05 07:17:38Z

5

I prefer an unobtrusive approach

<a href="/logout" id="logout-link">logout</a>

Then add the script

<script>
  var logoutLink = document.getElementById("logout-link");

  logoutLink.addEventListener("click", function(event) {
    if (confirm("Do you really want to logout?")) return;
    event.preventDefault();
  });
</script>

If the user clicks "OK", they just follow the href provided in the original link (/logout)

If the user clicks "Cancel", the confirmation dialog will go away, and nothing happens.

If the user has JavaScript disabled, the link will work, just without confirmation dialog.

edited Apr 5, 2014 at 7:17

answered Apr 5, 2014 at 7:05

Mulan

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3 Comments

Fr0zenFyr Over a year ago

How did you use logoutLink?

bprayudha Over a year ago

refactor: confirm('logout?') ? function(){return} : event.preventDefault();

Mulan Over a year ago

@bprayudha, I changed it a little bit.

Gaurav Parashar · Accepted Answer · 2014-04-05 07:05:15Z

3

try add onclick event

<a href="javascript:void(0);" onclick="callMeBeforeLogout();">Logout</a>

function callMeBeforeLogout() {
  alert('hi i m here');
}

if you want to redirect use window.location or window.location.href

answered Apr 5, 2014 at 7:05

Gaurav Parashar

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Comments

GautamD31 · Accepted Answer · 2014-04-05 06:59:37Z

1

Try like

<a href="javascript:;" onclick="callMeBeforeLogout();">Logout</a>

And in your function you have to write like

function callMeBeforeLogout()
{
    var cnfrm = confirm("Do you really want to logout?");
    if(cnfrm) {
        // here redirect to `logout.php`
        window.location.href = 'logout.php';
    }
}

answered Apr 5, 2014 at 6:59

GautamD31

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3 Comments

Fr0zenFyr Over a year ago

Exactly how I would have suggested.. +1

GautamD31 Over a year ago

@Fr0zenFyr ;-) but my ans was 3mins before your comment

Fr0zenFyr Over a year ago

I know, hence I didn't repeat an answer.

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