Make attachment required field in SharePoint list

Make attachment mandatory in SharePoint list we can use simple JavaScript.
Add content editor or script editor web part on "NewForm.aspx" near SharePoint list form web part. Then place the below code in it.

</pre>
<script type="text/javascript" language="javascript">
function PreSaveAction() {

var elm = document.getElementById("idAttachmentsTable");
 if (elm == null || elm.rows.length == 0)
{
 document.getElementById("idAttachmentsRow").style.display='none';
alert("Please attach resume");
return false ;
}
else { return true ;}
}
</script>



If attachment not found, it will give an alert with message “Please attach resume”.