html - return index of element in form -

this easy can't manage index of table in form can see in

.

i have selected table want index following way :

iedoc.queryselectorall("td[width='100'][class='listmaincent'][rowspan='1'][colspan='1']")(2).parentnode.parentnode.parentnode.parentnode.parentnode.parentnode.parentnode 

so can see, selected 1 of items.

so question is, how can gain index position of table in form ?

1. use selector add name or id table.

2. iterate top level tables in form until table name/id found.

   you have index.

   be sure check overhead of such process.