html - Random behaviour of anchor tags -

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i have anchor tag in html used javascript event. code looks this

<a href="#" onclick="myscript()">run</a>

however, when click script, first time links clicked reloads page. second , subsequent clicks, executes javascript.

my first thought was url

my url is

http://localhost/mypage.php?someid=1234567

but, after clicking javascript link first time, changes to

http://localhost/mypage.php#

my solution @ moment change anchor tag span, , mimic behaviour using javascript , css, hacked solution.

why happening? there way prevent this?

my application java struts application, , runs inside frame.

the reason don't stop default action of link, go url #. return false event:

<a href="#" onclick="myscript();return false;">run</a>

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