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[英]Child component doesn't rerender but parent component does rerender. How to make child component rerender?
[英]Reagent doesn't rerender component with deref-ing inside of let
我有原子foo
:
(defonce foo (r/atom "foo"))
我有父组件:
(defn parent-component []
(js/setTimeout #(reset! foo "bar") 5000)
(child-component {:foo foo}))
我有孩子组成部分:
(defn child-component [props]
(let [derefed (deref (:foo props))]
(fn []
[:div
[:p derefed]
[:p (deref (:foo props))]])))
重置foo
后只更新第二段。
为什么这样工作?
从有关Form-2组件的重新框架文档: https : //github.com/Day8/re-frame/wiki/Creating-Reagent-Components#form-2--a-function-returning-a-function 。
您需要在内部函数中再次重复外部函数参数:
(defn child-component [props]
(fn [props]
(let [derefed (deref (:foo props))]
[:div
[:p derefed]
[:p (deref (:foo props))]])))
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