[Rails] Form check boxes and Forms

Bit of a newbie question but I've got a form and I want bits of the
form to appear when a checkbox is clicked.

So for example I have a query such as do you want to have a link
attached to this post which is a tick box, then I have another field
which contains the text box for the link to go in.

So I want the link text box to appear when the checkbox is clicked.
Can anyone help?

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