<fileUpload id="fU"/>
<button caption="Импортировать" onclick="zenPage.jsLoad()"/>

Method jsLoad(cb) [ Language = javascript ]
{
 var path=this.getComponentById('fU').value;
alert(path)	
}

ClassMethod %OnSubmit(pSubmit As %ZEN.Submit) As %Status
{
	#dim stream As %GlobalBinaryStream
	#dim %session As %CSP.Session
	
	set stream=$G(%request.MimeData("$V_FileStream", 1 ))
	if $IsObject(stream) {
	  set %session.Data("streamSize")=stream.Size
	  set %session.Data("streamFileName")=stream.Atributes("что_указать?")
	}else{
	  d %session.Kill("streamSize")
	  d %session.Kill("streamFileName")
	}
	set %session.Data("proc")=pSubmit.%GetValue("proc")

	quit $$$OK
}