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Editorial Team
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Asked: 2026-06-15T12:36:25+00:00

My submenu doesn’t display after I add these lines line of code, what should

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My submenu doesn’t display after I add these lines line of code, what should I do instead?

Before I added this code, my submenu worked perfectly, the problem I suspect is window.onload.

The below code work perfectly with the result I want, but it create another problem for me which is my submenu doesnt display anymore 

  window.onload = function() 
  {
    var element = document.getElementById('<%=lblMessage.ClientID%>');
    var lblMsg = document.getElementById('<%=lblAttention.ClientID%>');

    lblMsg.style.display = 'none';


    if(element.innerHTML.length)
        lblMsg.style.display = 'inline';
    else
        lblMsg.style.display = 'none';

}

the error msg shown in browser

javascript:__doPostBack('ctl00$m$g_0248855d_ee1a_4a57_9508_a520e1f7f8b9$ctl00$MenuReport','Report')
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1 Answer

  1. Editorial Team

    Here is a suggestion

    Look at the page source

    If you have something like

    <body onload="somefunctiontoinitialisesubmenu()" ...>

    MOVE the code to the onload like this:

    window.onload = function() {
  var elem = document.getElementById('<%=lblMessage.ClientID%>');
  var lblMsg = document.getElementById('<%=lblAttention.ClientID%>');
  var html = elem.innerHTML;
  lblMsg.style.display = html.length!=-1?'inline':'none';
  somefunctiontoinitialisesubmenu();
}
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