Code for add,edit individual cell in the row,delete in gridview using javascript or jquery

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Javascript

jQuery

Hi,
I am using Gridview with add,edit,delete option. When i click on Edit button row becomes editable with Update & cancel button. But this process causes a postback which degrades performance in my scenario. Is there any other way available to make row editable without causing a postback(maybe using javascript or jquery)?I don't want to use update panels because in my scenarion i can't use those.Please do the needful,i am struct with my task please post the code.

Thanks,
Kiran