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avoid duplication of ID for same cell

mygrid.xml.cell_attrs=["id"];
mygrid.cells(1,0).setAttribute("id","itemNumber"); //you need not this code if original XML already contains id attribute
mygrid.cells(1,1).setAttribute("id","itemPrice");
mygrid.cells(1,2).setAttribute("id","onStock");

 

how to check if ID is inserted earlier into cells (and saved to DB) to avoid duplication of ID for same cell?

>>how to check if ID is inserted earlier into cells
var oldId = mygrid.cells(1,0).getAttribute("id");
if (!oldId) mygrid.cells(1,0).setAttribute("id","itemNumber");