I will recommend to use GlideAjax.

GlideAjax - ServiceNow Wiki

Can you please let me know the need of this script? I   am unable to identify your aim.

Kind regards,

Sourabh

Hi Sourabh,

My requirement is, if the user enters in the request no(the one which he has already raised), we will be validating whether its a valid request number by querying against the requested item table

So best bet would be to use GlideAjax. As gliderecord use in client scripts not recommended.

Kind regards,

Sourabh

Yes Sourabh.. we will be implementing the glide record functionality in Script include and will use glide ajax in the client script .. So ultimately, we will need to query tables.. rit?