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. This is useful for building controlled components. 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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