Sharepoint list item querystring id using javascript

Sharepoint list item querystring id using javascript

Easy way

Add this code in content editor webpart or content placeholder main  in sharepoint designer(dispform.aspx or editform.aspx)

<script type="text/javascript">

var itemId = GetUrlKeyValue("ID");
alert(itemId);</script>


(OR)

Add this code in content place holder main(allitems.aspx,dispform.aspx.......)  or content editor webpart

<script type="text/javascript">
//Call the javascript function in page load
onload=function()
{
    var query = location.search.substring(1);
    var SplitQuerry=query.split('&');
    var SplitId= SplitQuerry[0];
    var Id=SplitId.split('=');
  alert(Id);
}
</script>