Class BaseFormGroupAbstract

Called immediately before mounting occurs, and before Component#render. Avoid introducing any side-effects or subscriptions in this method.

This method will not stop working in React 17.

Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.

Deprecated

16.3, use componentDidMount or the constructor instead

See

• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#initializing-state
• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path

Called when the component may be receiving new props. React may call this even if props have not changed, so be sure to compare new and existing props if you only want to handle changes.

Calling Component#setState generally does not trigger this method.

This method will not stop working in React 17.

Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.

Deprecated

16.3, use static getDerivedStateFromProps instead

See

• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#updating-state-based-on-props
• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path

Called immediately before rendering when new props or state is received. Not called for the initial render.

Note: You cannot call Component#setState here.

This method will not stop working in React 17.

Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.

Deprecated

16.3, use getSnapshotBeforeUpdate instead

See

• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#reading-dom-properties-before-an-update
• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path

Catches exceptions generated in descendant components. Unhandled exceptions will cause the entire component tree to unmount.

Called immediately after updating occurs. Not called for the initial render.

The snapshot is only present if getSnapshotBeforeUpdate is present and returns non-null.

Called immediately before mounting occurs, and before Component#render. Avoid introducing any side-effects or subscriptions in this method.

Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.

Deprecated

16.3, use componentDidMount or the constructor instead; will stop working in React 17

See

• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#initializing-state
• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path

Called when the component may be receiving new props. React may call this even if props have not changed, so be sure to compare new and existing props if you only want to handle changes.

Calling Component#setState generally does not trigger this method.

Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.

Deprecated

16.3, use static getDerivedStateFromProps instead; will stop working in React 17

See

• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#updating-state-based-on-props
• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path

Called immediately before rendering when new props or state is received. Not called for the initial render.

Note: You cannot call Component#setState here.

Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.

Deprecated

16.3, use getSnapshotBeforeUpdate instead; will stop working in React 17

See

• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#reading-dom-properties-before-an-update
• https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path

Runs before React applies the result of render to the document, and returns an object to be given to componentDidUpdate. Useful for saving things such as scroll position before render causes changes to it.

Note: the presence of getSnapshotBeforeUpdate prevents any of the deprecated lifecycle events from running.

Called to determine whether the change in props and state should trigger a re-render.

Component always returns true. PureComponent implements a shallow comparison on props and state and returns true if any props or states have changed.

If false is returned, Component#render, componentWillUpdate and componentDidUpdate will not be called.