Repeater TextBox Addition

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C#

ASP.NET

Javascript

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In the above image Repeater control has been used in that item template three text boxes has been add as rate,quantity and unit. And i have an textbox outside the repeater control named totalamt.

In the rate textbox when i entered the value or change it it has to do the follwing

rate*quantity=totalamt

it has to be done in javascript without using the OnTextChanged Event in the textbox


Can anyone have the idea???[]