I caused an infinite loop by calling this.setState in componentDidUpdate. Außerdem möchte ich den Modifikator entsprechend seiner Richtung auf Dropdown setzen. componentDidUpdate()is called after componentDidMount() and can be useful to perform some action when the state changes. setState und die Methode nach einer Requisitenänderung in " Aber mit setState im inneren des componentDidUpdate wird eine unendliche Schleife(das ist offensichtlich). (Thus triggering hard to debug infinite loop...). This is the first method that is called when a component gets updated. Ausgehend von der Tatsache, dass Sie Werte benötigen, die vom Browser bereitgestellt werden, sobald die Komponente gerendert wurde, muss der Ansatz zur Verwendung von When componentDidUpdate() is called, two arguments are passed: prevProps and prevState. Just like componentDidMount(), the componentDidUpdate() is called after all of the children are updated. Also at updates the getDerivedStateFromProps method is called. Sie den If they are, the console log statement will be run. React lets you define components as classes or functions. Like mentioned before, to avoid an infinite loop, the API call needs to be inside a conditional statement. Please check component did update is called every time when the state updates and it can be even with anything just a mouse enter on div can change the state ? . ein wenig vernachlässigt Positionier-Logik zu vereinfachen-code), und hier ist der code, mit setstate (das wird eine unendliche Schleife), InformationsquelleAutor der Frage Katerina Pavlenko | 2015-05-29. Open source and radically transparent. Können Sie eine React-Komponente zum erneuten Rendern zwingen, ohne setState aufzurufen? . Now that componentWillReceiveProps() is being deprecated, componentDidUpdate() is the only "safe" way to detect changes in props and set state accordingly. An example of when to use componentDidUpdate() is when we need to call an external API on condition that the previous state and the current state have changed. InformationsquelleAutor der Antwort mickeymoon. To implement the highlighting component, the getSnapshotBeforeUpdate method should return an … I vote for the warning, even if just in development mode. (this would need to be done in eslint-plugin-react, however, not here), @dlwalsh, you may want to check this technique from the official React blog but I would suggest to read the entire article -- maybe you can completely avoid usage of getDerivedStateFromProps :). When componentDidUpdate() is called, two arguments are passed: prevProps and prevState. All the other methods described on this page are optional.We strongly recommend against creating your own base component classes. Habe ich eine Lösung gefunden, bei der Verwendung getDOMNode und Einstellung classname dropdown-Menü direkt, aber ich habe das Gefühl, dass es eine bessere Lösung mit Reagieren tools. This is the inverse of componentWillUpdate(). Außerdem möchte ich den Modifikator entsprechend seiner Richtung auf Dropdown setzen. Ich Schreibe ein Skript, das bewegt dropdown-unten oder oben-Eingang je nach Höhe der dropdown-und die position der Eingabe auf dem Bildschirm. ReactJS-Wird Render immer aufgerufen, wenn "setState" aufgerufen wird? In the lifecycle of a Component, componentDidMount() is called in the Mounting phase. 3. The new lifecycle method getDerivedStateFromProps is not a perfect replacement for componentWillReceiveProps as it does not provide access to prevProps. The getSnapshotBeforeUpdate method can also be used to test for changes to props. Mit dieser werden Sie in der Lage sein, zu prüfen, welche Requisiten/Zustand schmutzig sind und rufen setState entsprechend. I stumbled upon the same issue: claudiopro/2048-react#1. The following code triggers an infinite loop because componentDidUpdate is calling this.setState and even though the state isn't changing whatsoever another componentDidUpdate is being triggered. mit The React docs say calling setState() in componentDidUpdate() is permitted, albeit with caveats. React では、コンポーネントをクラスまたは関数として定義できます。クラスとして定義されたコンポーネントは現在このページで詳細に説明されているより多くの機能を提供します。React コンポーネントクラスを定義するには、React.Componentを継承する必要があります。 React.Component サブクラスで必ず定義しなければならない唯一のメソッドは render()です。このページで説明されている他のすべてのメソッドは任意です。 独自の基底コンポーネントクラスを作成しないことを強くおすすめしま … The warning I received was "Maximum call stack size exceeded" and the stack only showed React code, never any of my product code. When componentDidUpdate() is called, two arguments are passed: prevProps and prevState. in Another such methods is componentDidUpdate(). It is different. Polluting state with previous props/state really sucks. lautet We’ll occasionally send you account related emails. Auf Linux - set für die maximal offenen Dateien unbegrenzt. Once again, we can access the Native UI stack, interact with our refs and if required start another re-render/update 1.
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