Button on header doesn't work after partial refresh

[jme37]

i have a button on my SN header that opens and closes a side panel. It works fine on most pages but not on the search result page after a search. i think this is due to lazy loading. It can't find the document element in this code and the style 

$scope.openNav = function openNav() {  

        c.data.panel = true;

  document.getElementById("mySidepanel").style.width = "345px";

How can i ensure the header is properly loaded so that mySidepanel is defined ?

[jme37]

i think what i need to do is reload/refresh one element on the header rather than reload the whole page - is it possible to do that ?