Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.
And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.
SSR rehydrate
See original GitHub issueThis is a question.
In React 16, when using SSR, in the client-side code, we need to use hydrate instead of render so that React only registers event handler. I guess that React does this by comparing the checksum between server-side rendered html and supposed-to-be client-side rendered html.
While playing with Preact and attempting to perform SSR, I notice that at first my component was rendered twice. The rendering code is
// Server code
app.get("/", (req, res) => {
const html = renderToString(<App />)
res.render('index', { html })
})
// Client code
const root = document.getElementById("root")
render(<App />, root)
and the resulting html is
...
<div id="root">
<div>This is my app.</div>
<div>This is my app.</div>
</div>
...
When I change the client code to be
// Client code
const root = document.getElementById("root")
render(<App />, document.body, root)
The rendered html appears to be correct
...
<div id="root">
<div>This is my app.</div>
</div>
...
but I wonder if it was the original html with preact event all hooked up, or if the content was replaced with exactly the same content.
Please help me shed some light on this.
Issue Analytics
- State:
- Created 5 years ago
- Comments:12 (5 by maintainers)
Top Results From Across the Web
Top Related Medium Post
Top Related StackOverflow Question
Troubleshoot Live Code
Top Related Reddit Thread
Top Related Hackernoon Post
Top Related Tweet
Top Related Dev.to Post
Top Related Hashnode Post
There is no meaningful difference between hydrate() and render() within Preact, since we don’t use checksums.
If you’re seeing a flash of white or similar, check that you’re not rendering something that is initially different from your server-rendered HTML. Also make sure you’re interpreting the meaning of “parent” and “root” correctly:
If you’d like a hydrate method, here’s a simple one:
Sweet. This can be closed then, correct?