how to call a function of javascript in jsp without any event -

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how can call javascript function without event. have session variable namely x. need call javascript function demo() if session variable not null.

 <% if((string)session.getattribute("x")!=null)            { %> <script type="text/javascript"> demo(); </script>   <% } %>

let me know right way of calling demo function.

if understand correctly, use onload event. at
http://www.javascriptkit.com/javatutors/event3.shtml

window.onload vs <body onload=""/>


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