valueProcess.js

import("system.result");
import("system.neon");
import("system.neon");
import("DocumentTemplate_lib");
import("system.vars");

if((vars.get("$sys.operatingstate") == neon.OPERATINGSTATE_EDIT || vars.get("$sys.operatingstate") == neon.OPERATINGSTATE_NEW) && vars.get("$this.value") == null)
{
    [content, type] = DocumentTemplateUtils.getTemplateContent(vars.get("$field.DOCUMENTTEMPLATEID"), new FileUpload(vars.get("$field.BINDATA")));
    vars.set("$context.currentTemplateType", type);
    result.string(content);
}