#7 parricipant is able to go back from view to view

[Anonymous]

Index.php US the central Output of egg ui. Egg forces User to be in a location Inside the System. The User should not able to Change locations by himself. Currently he can Switch back by pressing Browsers back Button.

[Marcus Pinnecke]

Also Check Opera; Maybe the view is not able to be controlled by egg system

[TUM-HR]

Try to solve problem (appearing only on Opera, afawk) using:
<meta http-equiv="cache-control" content="no-cache">
and
header('Cache-Control: no-store, no-cache, must-revalidate');

[Oksana Kulyk]

Cache Control doesn't work since a different mechanism is used for accessing pages with Back button. So far no solution found.

[Oksana Kulyk]

Workaround needed: users may be able to switch between views with the 'Back' button, but they shouldn't be allowed to send the forms twice, enter another experiment etc (this may be ensured by PHP&JavaScript means). The treatment of history navigation in Opera seems to be mostly uncontrollable by us.

[Marcus Pinnecke]

Möglichkeit u.U. Öffnen der Seite in neuen Fenster ohne Menübar, Toolbar etc. (in Opera)
oder JavaScript
oder Opera verbieten

[Oksana Kulyk]

<script language="JavaScript"><!--
javascript:window.history.forward(1);
//--></script> seems to solve the problem so far

[TUM-HR]

Please confine solution to Opera only. All other brothers seem to work fine without.