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smart rendering: working with only already downloaded rows

Is there a way to determine downloaded rows in order to work only with them?
I need a function similar to the getRowsNum() , but return available rows. And a function to return loaded rowIDs

Thx, Dido

There is no separate list of already available rows, but you can use
    grid.forEachRow
itterator, which works with available rows only

    var count=0;
    grid.forEachRow(function(id){
       alert(id)
       count++;
    });
    alert(count);

It's exactly (100%) what i needed.

Thx,

Dido