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DAN ABRAMOV
Term coined by
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CONTAINER &
PRESENTATIONAL
Later called them
components
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C IN
MVC = SMART
V IN
MVC = DUMB
Others have compared them to
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How things work
No DOM markup, no styles
Provide data
Call actions
How things look
No app dependencies
Just props, for data and callbacks
Rarely have own state, only UI state
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Separation of concern
Easier to reason about
Localize complexity
Lots simple components
UI bits more reusable
BENEFITS
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* (UI noun)
MemberTableHeader
SearchInput
FieldErrors
OrgInvitesPendingContainer
OrgPageContainer
ReportsUsersContainer
*Container
NAMING
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App needs to be smart
Have data
Respond to interaction
Mostly dumb
Lots of UI
WHERE TO SPLIT?
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Simplest
One transition into dumb components
1-1
SPLIT
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“Deep”
1 component, many props
eg, OrgLayoutContainer -> OrgLayout
1-1
SPLIT
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Make the transition faster
Scattered props
Access to Container references
1-*
SPLIT
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“Broad”
eg, ReportsUsersContainer -> *
1-*
SPLIT
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"When you notice that some components don’t use the
props they receive but merely forward them down and
you have to rewire all those intermediate components
any time the children need more data, it’s a good time
to introduce some container components.”
@dan_abramov
MOAR BROAD?
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CONTAINMENT
props.children
props.other
React.PropTypes.node
Name *Layout
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ANOTHER EXAMPLE
} />
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PROPS TO PASS?
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ALL PROPS
True wrapper
Passthrough, provides additional functionality
eg, OverallTrendWidgetContainer -> OverallTrendWidget
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WHOLE REDUCER
Lazy?
Couples view to reducer format in more places
eg, OverallTrendWidgetContainer -> OverallTrendWidget
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NEW PRIMITIVES
Explicit
Traceable
Decoupled
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DISTINGUISHING
Rule of thumb:
@styleable(css)
@connect([selector])
class OneReactComponent extends AntiPattern
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DOGMA
It’s an art
Pirates’ Code
Think
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THANK YOU