Today we will see how can we add an auto complete function to a SharePoint field in SharePoint 2013 or Online using SPServices. It will provide an easier way to provide user lookup functionality as a help instead of mandatory way and also add below code to on NewForm.aspx of your destination List by adding a Script Editor Webpart:
<script language="javascript" src="//code.jquery.com/jquery-1.6.2.min.js"
type="text/javascript"></script>
<script language="javascript" src="//cdnjs.cloudflare.com/ajax/libs/jquery.SPServices/2014.02/jquery.SPServices-2014.02.min.js"
type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
$().SPServices.SPAutocomplete({
sourceList: "SourceList", // Source List Name
sourceColumn: "Title", // Source List Column from where you want to fetch it.
columnName: "DestinationListColumn", // Destination List Column where you wan to add it.
ignoreCase: true,
numChars: 2,
slideDownSpeed: 'fast'
});
});</script>
