53 lines
1.1 KiB
Plaintext
53 lines
1.1 KiB
Plaintext
``++isMounted()++`` is generally used before calling ``++setState++`` to avoid changing the state on an already unmounted component. A user should never be able to do an action on an unmount component unless the component is having a bug in its unmount phase.
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This rule raises an issue on each use of ``++isMounted()++``.
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``++isMounted()++`` is not longer available in ES6. Use of ``++isMounted()++`` must be avoided to ease the upgrade to ES6.
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== Noncompliant Code Example
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----
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if (this.isMounted()) { // Noncompliant
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this.setState({...});
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}
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----
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== Compliant Solution
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----
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class MyComponent extends React.Component {
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_isMounted = false;
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componentDidMount() {
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_isMounted = true;
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...
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if (_isMounted) {
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this.setState({...});
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}
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}
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render() {
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...
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}
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componentWillUnmount() {
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_isMounted = false;
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}
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}
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----
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== See
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* https://reactjs.org/blog/2015/12/16/ismounted-antipattern.html[React.js blog] - isMounted is an Antipattern
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ifdef::env-github,rspecator-view[]
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== Comments And Links
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(visible only on this page)
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include::comments-and-links.adoc[]
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endif::env-github,rspecator-view[]
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