Hi SNOW,
As Mark replied, it's a bad practice to use GlideRecord() or reference() in client script because of performance. It's better to use GlideAjax to call Script Include function asynchronously.
It's not recommended to use GlideAjax in onSubmit() scripts because the script will continue execution and submit the form before returning a value. In this case, it's better to redesign to check a field in onChange() or fill other variable in a business rule.
Instead of dot-walking on client script, use g_scratchpad in display business rule or get the value in a GlideAjax call script include.
