![]() React has always provided a JavaScript-centric API to the DOM. All Supported HTML AttributesĪs of React 16, any standard or custom DOM attributes are fully supported. defaultValue is the uncontrolled equivalent, which sets the value of the component when it is first mounted. This is useful for building controlled components. You can use it to set the value of the component. The value attribute is supported by, and components. You can read more about hydration in the ReactDOM.hydrateRoot() documentation. It only works one level deep, and is intended to be used as an escape hatch. If you set suppressHydrationWarning to true, React will not warn you about mismatches in the attributes and the content of that element. For example, timestamps are expected to differ on the server and on the client. However, in some rare cases, it is very hard or impossible to guarantee an exact match. If you use server-side React rendering, normally there is a warning when the server and the client render different content. Don’t use this unless you are building a library like Draft.js that manages contentEditable manually. ![]() Normally, there is a warning when an element with children is also marked as contentEditable, because it won’t work. A complete list of unitless properties can be seen here. Certain ones remain unitless (eg zoom, order, flex). Not all style properties are converted to pixel strings though. This is consistent with the DOM style JavaScript property, is more efficient, and prevents XSS security holes. The style attribute accepts a JavaScript object with camelCased properties rather than a CSS string. style is most often used in React applications to add dynamically-computed styles at render time. In most cases, className should be used to reference classes defined in an external CSS stylesheet. Some examples in the documentation use style for convenience, but using the style attribute as the primary means of styling elements is generally not recommended. If you want to mark an as selected, reference the value of that option in the value of its instead.Ĭheck out “The select Tag” for detailed instructions. We intentionally do not use the existing browser behavior because onChange is a misnomer for its behavior and React relies on this event to handle user input in real time. The onChange event behaves as you would expect it to: whenever a form field is changed, this event is fired. Since for is a reserved word in JavaScript, React elements use htmlFor instead. For example:įunction createMarkup ( ) htmlFor So, you can set HTML directly from React, but you have to type out dangerouslySetInnerHTML and pass an object with a _html key, to remind yourself that it’s dangerous. In general, setting HTML from code is risky because it’s easy to inadvertently expose your users to a cross-site scripting (XSS) attack. dangerouslySetInnerHTMLĭangerouslySetInnerHTML is React’s replacement for using innerHTML in the browser DOM. If you use React with Web Components (which is uncommon), use the class attribute instead. This applies to all regular DOM and SVG elements like, , and others. To specify a CSS class, use the className attribute. defaultChecked is the uncontrolled equivalent, which sets whether the component is checked when it is first mounted. ![]() You can use it to set whether the component is checked. The checked attribute is supported by components of type checkbox or radio. There are a number of attributes that work differently between React and HTML: checked For example, you can keep aria-label as aria-label. The exception is aria-* and data-* attributes, which should be lowercased. For example, the HTML attribute tabindex corresponds to the attribute tabIndex in React. In React, all DOM properties and attributes (including event handlers) should be camelCased. We took the opportunity to clean up a few rough edges in browser DOM implementations. React implements a browser-independent DOM system for performance and cross-browser compatibility. These new documentation pages teach modern React and include live examples:
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