Here are couple of videos to refresh or learn GlideAjax from scratch. Using GlideAjax is considered to be the best practice when you are bring records from Server script to Client script.
I have discussed in detail about the GlideAjax and its type in detail with example as well in the following video.
In the second video, we will see how can bring multiple values from Script Include to Client Script. Also, we will see how can use those values to update the values of fields on the form.
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