That's because you used a plain HTML input element instead of a fullworthy JSF input component like h:inputText . This way the value is in no way bound to the JSF context. It's only treated as plain vanilla template output value, not as input value.
A composite component isn't going to solve this. You really need to create a fullworthy UIComponent for this (or to look for a 3rd party component library which has already done the nasty job for you, such as PrimeFaces with its p:slider ).
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