data-confirm update through ajax

_form.html.erb

<%= submit_tag "Save Changes", :id => "special_message",:class => "btn btn-success navbar-btn", data: { confirm: "" } %>

tenants.js.coffee

		$("#special_message").mouseover ->
		    
		    $.ajax(
				        url: "/tenants/tenants_in_local"
				        dataType: "text"
				        data:
				            pnum: $('#tenant_propertynumber').val(),
				            bnum: $('#tenant_tenantbuildinginfo').val()
				    ).success( (data) ->
				    	   
				        $("#special_message").attr "data-confirm", data
				    ).error( (data) ->
				      	console.log 'error'
				    )
		   return