Summary
When creating a custom component for Netlify CMS, the useEffect and useCallback hooks do not execute in the preview iFrame, as the javascript itself is not embedded in the iFrame.
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This means that the component will not be rendered as expected in the preview.
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However, the component will render correctly when published.
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Summary
When creating a custom component one can write a hook and use the useEffect to say manage how the component finally looks, behaves.
However, when this component is rendered in the netlify cms preview its javascript doesn’t execute. I presume this is because the javascript itself isn’t embedded into the preview iFrame.
Custom widget preview doesn't execute react useEffect or useCallback ...
netlify.com
The useEffect Hook allows you to perform side effects in your components. Some examples of side effects are: fetching data, directly updating the DOM, and timers. useEffect accepts two arguments.…
React useEffect - W3Schools
w3schools.com
Netlify CMS has long been a flexible content management system for users, but opportunities still exist to further customize and extend its capabilities. To ensure continued support, investments, and maintenance…
Netlify CMS to Become Decap CMS: What You Need to Know
netlify.com
If you’re familiar with React class lifecycle methods, you can think of useEffect Hook as componentDidMount, componentDidUpdate, and componentWillUnmount combined. There are two common kinds of side effects in React…
Using the Effect Hook – React
reactjs.org
NetlifyCMS is an open-source, free to use content management system that you can add to any static site generator. All the content is stored in files added to your repository,…
NetlifyCMS - Bejamas
bejamas.io
NetlifyCMS is an open-source, free to use content management system that you can add to any static site generator. All the content is stored in files added to your repository,…
useEffect() — what, when and how - Medium
medium.com
Netlify CMS. A CMS for static site generators. Give non-technical users a simple way to edit and add content to any site built with a static site generator. Netlify CMS…
Netlify CMS | Jamstack
jamstack.org
useEffect 做了什么？. 通过使用这个 Hook，你可以告诉 React 组件需要在渲染后执行某些操作。. React 会保存你传递的函数（我们将它称之为 “effect”），并且在执行 DOM 更新之后调用它。. 在这个 effect 中，我们设置了 document 的 title 属性，不过我们也可以执行数据 ...
使用 Effect Hook – React
reactjs.org
