JS onSave event is not working in Microsoft Edge. what are the alternatives for it?

Question

I'm working in correcting js code to be compatible with Micorosoft Edge. I have a problem with <onLoad> and <onSave> events which were working well with Internet Explorer, but not with Ms Edge. I've read that <onSave> is obsolete (https://learn.microsoft.com/en-us/previous-versions/ms531412(v=vs.85)). I wanted to know what re the alternatives for these events ?

.Ascx Page

<div id="divMenu" onchange ="saveState()" onLoad ="loadState()" class="saveHistory" style="display:none;></div>

js file

function loadState(){**Code**}
function saveState(){**Code**}

Thank you in advance :)

I ve found a way to execute onLoad() function by adding this in ascx page but not for onSave(). Is there any alternative for onSave() ?

 <script type="text/javascript">
        window.onload = loadState('divMenu');
  </script>