Can I use SPEL instead of PPR

Dear,
I have two message text input fields on a page. My requirement is - the second one should render ONLY IF a user enters XYZ in the first field.
From looking at posts related to SPEL I gather that I need to use PPR to satisfy this requirement because if I create a transient attribute in the VO for field one - the attribute won't be populated until I submit the page? But I need to render field two as soon as I navigate out of field one.
Am I correct in my assumption that I can only acieve this through PPR?
Thank you.
Anatoliy

Just to add a bit more detail: PPR is used where you want to rerender a particular portion of the page based on the some user action instead of complete page refresh.
Whereas SPEL is used where you want to control some properties of the bean based on an expression which can use some runtime values from page. Rendered, Read Only, Disabled, and Required are the only properties for which SPEL bindings can be defined.
--Shiv

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