更改状态但不重新呈现反应redux

Question

我一直在访问存储区以更改状态，甚至可以在控制台中看到更改，但是ui并未重新呈现。 这里是我的代码的存储库（非常小，非常基本）。 为什么我的用户界面不重新显示？

https://github.com/shanemmay/test-3

Answer 1

在您的 index.js 中，您需要更改为Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Invalid ValueEval type passed for conversion: (class org.apache.poi.ss.formula.eval.MissingArgEval) at org.apache.poi.ss.formula.functions.MultiOperandNumericFunction.collectValue(MultiOperandNumericFunction.java:219) at org.apache.poi.ss.formula.functions.MultiOperandNumericFunction.collectValues(MultiOperandNumericFunction.java:179) at org.apache.poi.ss.formula.functions.MultiOperandNumericFunction.getNumberArray(MultiOperandNumericFunction.java:128) at org.apache.poi.ss.formula.functions.MultiOperandNumericFunction.evaluate(MultiOperandNumericFunction.java:90) at org.apache.poi.ss.formula.OperationEvaluatorFactory.evaluate(OperationEvaluatorFactory.java:132) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateFormula(WorkbookEvaluator.java:540) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateAny(WorkbookEvaluator.java:303) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluate(WorkbookEvaluator.java:245) at org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator.evaluateFormulaCellValue(XSSFFormulaEvaluator.java:268) at org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator.evaluateFormulaCell(XSSFFormulaEvaluator.java:155) at org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator.evaluateAllFormulaCells(HSSFFormulaEvaluator.java:335) at org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator.evaluateAllFormulaCells(HSSFFormulaEvaluator.java:326) at org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator.evaluateAll(XSSFFormulaEvaluator.java:256) at XLSXEditor.searchWriter(XLSXEditor.java:218) at Main.fillTable(Main.java:962) at Main.btShowActionPerformed(Main.java:715) at Main.access$900(Main.java:25) at Main$11.actionPerformed(Main.java:402) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6533) at javax.swing.JComponent.processMouseEvent(JComponent.java:3324) at java.awt.Component.processEvent(Component.java:6298) at java.awt.Container.processEvent(Container.java:2236) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventImpl(Container.java:2294) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466) at java.awt.Container.dispatchEventImpl(Container.java:2280) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.awt.EventQueue$4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) 组件提供商店的方式。应该是这样的。

App

然后在您的 App.js 中，您需要将状态映射到道具，然后显示该道具的编号。最重要的是，您必须使用import {Provider} from 'react-redux' ReactDOM.render( <Provider store={store}> <App /> </Provider>, document.getElementById('root')); 将react组件连接到redux存储。以下是您需要修改App.js的方式

connect

请务必通过https://redux.js.org/basics/usage-with-react以获得更好的理解。

Answer 2

如madhu bhat所说，您的应用程序需要使用提供程序来连接到redux框架。

您必须遵循redux架构，基本的了解将使您非常简单地解决此问题。

基本流量

  

在我的存储库中访问相同的示例

     

https://github.com/zural/react-redux-simple-counter/tree/master

这将使您了解redux流和反应状态。