An easy way to remove a row from a childtable

[adam26d]

delete_btn: function(frm, cdt, cdn) {
 let row = locals[cdt][cdn];

 // get the row index and reduce it by 1 (because JS)
 cur_frm.get_field("childtable_field").grid.grid_rows[row.idx-1].remove(); 

 frm.refresh();
}

Adapted from

@sorin.negulescu

var tbl = doc.child_table || [];
var i = tbl.length;
while (i--)
{
    if(tbl[i].field_name == '')
    {
        cur_frm.get_field("child_table").grid.grid_rows[i].remove();
    }
}
cur_frm.refresh();

IMO this is still very complex but okay in comparison. Better would simply need to be row.remove()