react proptypes

PropTypes helps us to check, whether component props is receiving correct type data or not. // Alles, was gerendert werden kann: Zahlen, Zeichenketten, Elemente. Make sure that the version range uses a caret (^) and thus is broad enough for npm to efficiently deduplicate packages. 自 React v15.5 起，React.PropTypes 已移入另一个包中。请使用 prop-types 库 代替。, 随着你的应用程序不断增长，你可以通过类型检查捕获大量错误。对于某些应用程序来说，你可以使用 Flow 或 TypeScript 等 JavaScript 扩展来对整个应用程序做类型检查。但即使你不使用这些扩展，React 也内置了一些类型检查的功能。要在组件的 props 上进行类型检查，你只需配置特定的 propTypes 属性：, 在此示例中，我们使用的是 class 组件，但是同样的功能也可用于函数组件，或者是由 React.memo/React.forwardRef 创建的组件。, PropTypes 提供一系列验证器，可用于确保组件接收到的数据类型是有效的。在本例中, 我们使用了 PropTypes.string。当传入的 prop 值类型不正确时，JavaScript 控制台将会显示警告。出于性能方面的考虑，propTypes 仅在开发模式下进行检查。, 你可以通过 PropTypes.element 来确保传递给组件的 children 中只包含一个元素。, 您可以通过配置特定的 defaultProps 属性来定义 props 的默认值：, 如果你正在使用像 transform-class-properties 的 Babel 转换工具，你也可以在 React 组件类中声明 defaultProps 作为静态属性。此语法提案还没有最终确定，需要进行编译后才能在浏览器中运行。要了解更多信息，请查阅 class fields proposal。, defaultProps 用于确保 this.props.name 在父组件没有指定其值时，有一个默认值。propTypes 类型检查发生在 defaultProps 赋值后，所以类型检查也适用于 defaultProps。, // An object with warnings on extra properties, // 你可以在任何 PropTypes 属性后面加上 `isRequired` ，确保, // 请不要使用 `console.warn` 或抛出异常，因为这在 `onOfType` 中不会起作用。, // 你也可以提供一个自定义的 `arrayOf` 或 `objectOf` 验证器。. Die ersten beiden Argumente des Prüfers sind das. PropTypes was originally exposed as part of the React core module, and is How to wrap table cell content using CSS ? You can define default values for your props by assigning to the special defaultProps property: If you are using a Babel transform like transform-class-properties , you can also declare defaultProps as static property within a React component class. For UMD bundles of your components, make sure you don’t include PropTypes in the build. However, code like this will not work with the prop-types package: (If you see a warning rather than an error with this message, please check the above section about compatibility.). This package is compatible with React 15.3.0 and higher. The simplest way to define a component is to write a JavaScript function:This function is a valid React component because it accepts a single “props” (which stands for properties) object argument with data and returns a React element. Please use ide.geeksforgeeks.org, generate link and share the link here. Don't `console.warn` or throw, as this. We provide a codemod script to automate the conversion. // Du kannst auch einen benutzerdefinierten Validierer für `arrayOf`, // und `objectOf` liefern. Also a command line tool, you don’t have to be limited to use in vscode. This is the VS Code's extension that automatically generates PropTypes code for React components, like ReactPropTypes in the Jetbrains's Platform. No, we do not. Write Interview React.PropTypes has moved into a different package since React v15.5. npm install --save react@^0.14.9 react-dom@^0.14.9. Usually this is done by marking it as an external (the specifics depend on your bundler), just like you do with React. Hier ist ein Beispiel, das die verschiedenen verfügbaren Validatoren dokumentiert: Mit PropTypes.element kannst du festlegen, dass nur ein einzelnes Kind (Child) an eine Komponente als Children übergeben werden kann. They stop supporting it in React since v15.5 and moved it over to a different package.

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