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onchange for dynamically added rows

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Hi ,

I am new to javascript and have coded an invoice page through help from some available

content on web.

here is my requirement

My form contains inputs "item ,rate quantity,price" in a tabular form where one can

dynamically add or delete rows.And the requirement is that

when Quantity is entered the Price should change to Price=Quantity*Rate on tab out

So I have used a Javascript onchange() and this works fine for the first displayed row.

but for dynamically added rows this does not happen, I am not able change the price

value for dynamically added rows.

Code is as below

my java script for dynamically adding rows works as below for each cell

for newly added row the columnQuantit will be created like this

Add row()

calculate price:

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