自动完成问题(Material UI + React + Reagent/ClojureScript)
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【中文标题】自动完成问题(Material UI + React + Reagent/ClojureScript)【英文标题】:Problem with Autocomplete (Material UI + React + Reagent/ClojureScript) 【发布时间】:2021-01-04 17:14:15 【问题描述】:我在使用 Material UI 的 Autocomplete
和 Reagent (ClojureScript) 时遇到问题。该元素呈现良好,但是当我尝试单击它时,出现以下异常:
Uncaught TypeError: Cannot read property 'focus' of null
at handleClick (useAutocomplete.js:938)
at htmlUnknownElement.callCallback (react-dom.development.js:189)
at Object.invokeGuardedCallbackImpl (react-dom.development.js:238)
at invokeGuardedCallback (react-dom.development.js:293)
at invokeGuardedCallbackAndCatchFirstError (react-dom.development.js:307)
at executeDispatch (react-dom.development.js:390)
at executeDispatchesAndReleaseTopLevel (react-dom.development.js:412)
at forEachAccumulated (react-dom.development.js:3260)
at runEventsInBatch (react-dom.development.js:3305)
at handleTopLevel (react-dom.development.js:3515)
useAutocomplete.js:322 Uncaught TypeError: Cannot read property 'removeAttribute' of null
at eval (useAutocomplete.js:322)
at eval (useEventCallback.js:26)
at eval (useAutocomplete.js:433)
at eval (useEventCallback.js:26)
at eval (useAutocomplete.js:463)
at eval (useAutocomplete.js:528)
at commitHookEffectListMount (react-dom.development.js:19765)
at commitPassiveHookEffects (react-dom.development.js:19803)
at HTMLUnknownElement.callCallback (react-dom.development.js:189)
at Object.invokeGuardedCallbackImpl (react-dom.development.js:238)
在 JS 调试器中中断,我看到 inputRef.current
为空(这是调用 focus
和 removeAttribute
的原因。(奇怪的是,在文件中设置 inputRef
的唯一位置是通过调用useRef(null)
,这就是导致 inputRef.current
为空的原因。)
在我的代码中,我将自动完成字段定义如下:
(ns my-product-redacted.views.atoms
(:require [reagent.core :as r]
["@material-ui/lab/Autocomplete" :default Autocomplete]
;; other requires
))
(def autocomplete-field (r/adapt-react-class Autocomplete))
那么,在一个 React 组件中,它是这样使用的:
[a/autocomplete-field :render-input (fn [js-params]
(let [clj-params (js->clj js-params)
params :label label
:width width
:select select?
:Input-label-props :shrink true
:Select-props :native true
all-params (into clj-params params)]
(js/console.log (clj->js all-params))
(r/as-element [a/text-field all-params])))
:options (when select? (cons :value "" :label "" options))
:get-option-label (fn [option] (or (get (js->clj option) "label") ""))
:default-value (when (not select?) value-override)
:value (when select? value)
:disabled disabled?
:on-focus #(re-frame/dispatch [::forms/on-focus path])
:on-blur #(re-frame/dispatch [::forms/on-blur path])
:on-change #(re-frame/dispatch (conj on-change (-> % .-target .-value))))]
(这里,a/text-field
也与a/autocomplete-field
定义在相同的命名空间中,并且以类似的方式。)
JS 控制台日志(来自(js/console.log (clj->js params))
调用)显示inputProps.ref.current
设置为空。但是,InputProps.ref
不为空。尽管如此,我还是尝试手动将与InputProps.ref
传递的相同函数关联到inputProps.ref.current
,但这并没有什么区别。
我还尝试了https://github.com/mui-org/material-ui/issues/21245 中建议的解决方法(尽管该问题与格式塔库有关,而不是与试剂有关,但它表明引用转发可能存在问题)。但是将text-field
包装到一个div 中,其中ref
取自InputProps.ref
也没有任何区别。
有什么建议吗?
【问题讨论】:
【参考方案1】:在渲染输入 js 参数上调用 js->clj
会破坏它们。
我在我的演示库 here 中放了一个材料 UI 自动完成组件的快速演示。
但主要取自官方试剂文档/示例here:
(defn autocomplete-example []
[:> mui/Grid
:item true
[:> Autocomplete :options ["foo" "bar" "foobar"]
:style :width 300
;; Note that the function parameter is a JS Object!
;; Autocomplete expects the renderInput value to be function
;; returning React elements, not a component!
;; So reactify-component won't work here.
:render-input (fn [^js params]
;; Don't call js->clj because that would recursively
;; convert all JS objects (e.g. React ref objects)
;; to Cljs maps, which breaks them, even when converted back to JS.
;; Best thing is to use r/create-element and
;; pass the JS params to it.
;; If necessary, use JS interop to modify params.
(set! (.-variant params) "outlined")
(set! (.-label params) "Autocomplete")
(r/create-element mui/TextField params))]])
【讨论】:
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