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In my React native' project i need to check when component is shown in screen to update UI by background thread.
I have look around component props specs and try componentWillUnmount,componentWillMount but it not working in my case.
I have try using navigator.getCurrentRoutes() too, but it return empty object.
Please help me solve this case!.
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Summary. Use the getBoundingClientRect() method to get the size of the element and its relative position to the viewport. Compare the position of the element with the viewport height and width to check if the element is visible in the viewport or not.
To get the position of an element with React Native, we can get it from the View 's onLayout callback. to add a View with the onLayout prop set to a function that gets the position values from the event. nativeEvent. layout property.
There's a checkbox well hidden in the React DevTools settings that allows you to visually highlight the components that rerendered. To enable it, go to "Profiler" >> click the "Cog wheel" on the right side of the top bar >> "General" tab >> Check the "Highlight updates when components render." checkbox.
Use the window object to get the current URL in React, e.g. window. location. href returns a string containing the whole URL. If you need to access the path, use window.
If you use react-navigation you can try useFocusEffect useFocusEffect
But if you don't use it, you can subscribe to the event onLayout of a View. It will trigger whenever your component is mount or your screen's layout change. React Native onLayout
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