Ruby on Rails

Hi everyone,

I like to learn how to create text_field by cliking button as dynamicly.
I need "add" button which creates 3 text_fields on the same line,
"height" * "width" = "size"

I like to click button and creating 3 text fileds one takes height, one
takes width and third one calculate area with multiplication of two
values.
but I don t know how to create text fields by clicking button each time
and add more than one line
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