It's got to be in the docs somewhere, but here is the short version:

Ajax calls going out to the server specify, as part of post arguments, what call it is – Edit, or Del.

Now, If id element in Edit post is empty or some unrecognizable garbage, it's an Add. :

Something like that.

Don't know if this will give you much of an example, but here, in testing.js I play around with Add, Edit, Del ajax calls and explain some thing in the comments:

On the demo page:

http://trirand.com/blog/jqgrid…..qgrid.html

1. then go:

I didn't say this:

opps – my example link had an error later last night, when I pushed some code out. fixed.