As the title shows, Can i know how many times when a class component or a functional component render? Is there any chrome extension or webpack plugin?And now i just can get this by console.log
just console.log to log the times
You should use react-devtools:
Install react-devtools extension.
While on a development environment, excess your browser dev tools.
Go to Profiler tab
Press Start-Profiling
Examine the snapshot
Dashboard Component (0.6ms of 86.ms) - Rendered at 1.3 for 83ms
Refer to official walkthrough video of the profiler on YouTube.
Related
I'm not sharing any code its just a question is there any way to find witch component or function throw this error on my project
install "React Developer Tools " extension in your
browser
step 2: inspect the code you will have component
section open that you will find which component gets
error see in image
Steps to reproduce:
Using props children and update state component in which ReactMarkdown is placed.
Expected behavior:
I expected that when processing the same markdown, the generated html would not change.
Actual behavior:
I connected MutationObserver for show mutations in html. And and use console.log in children components. We can see in the console log that the children components start every time and the html changes when the state of the component in which ReactMarkdown is located changes.
Link to runnable example:
See console log in this example
Package:
ReactMarkdown 8.0.2
Runtime
Node v17
Package manager
npm 8
OS
Windows, Linux
Build and bundle tools
Create React App
React.memo helped solve the problem see the exmple
Home.tsx，Page effect
Modify the Home component and save it.
And the terminal console can see the update of hmr, but the page effect has not changed, and the console.log in the Home component has not been triggered.
I am using Cypress to test a React app.
is there a way to make this warning message in my console go away:
Download the React DevTools for a better development experience: ...
you will note that I see this warning only when running the controlled Chrome instance, not when looking at the same app in the normal Chrome browser. (As well, I do have the React dev tools installed and activated in Chrome so it seems this message is a side effect of the Cypress test-runner)
Add this regex to the DevTools console filter input:
-/React.DevTools/
Im running react 16.8+ on Internet Explorer 9.
Initially the page renders as blank without any react app in the root element.
When I open the F12 dev tools and refresh the page it renders fine.
When I close the dev tools and refresh it also renders fine.
Does anyone have an idea why initially the page is not rendered?
Apparently since redux is trying to console log the app freezes, since console log is only available when dev-tools is open. Therefor add the following polyfill in your index.tsx / index.js above all other imports:
yarn add console-polyfill