Tag Archives: react native

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Undocumented props. Why?

Anyway.

onMomentumScrollEnd will fire when the animation of the ScrollView stops.

For example, you can use the following snippet, to get the Y position of a <ScrollView ref="scrollView" />:

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const RCTUIManager = require('NativeModules').UIManager
const sv = this.refs['scrollView'] as any
RCTUIManager.measure(sv.getInnerViewNode(), (...data) => {
  console.log(data[5])
})

And this is the order in which events of a ScrollView fire, in case you ever find yourself looking for answers that can’t be found in the official docs.

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onTouchStart={() => console.log('onTouchStart')}
onTouchMove={() => console.log('onTouchMove')}
onTouchEnd={() => console.log('onTouchEnd')}
onScrollBeginDrag={() => console.log('onScrollBeginDrag')}
onScrollEndDrag={() => console.log('onScrollEndDrag')}
onMomentumScrollBegin={() => console.log('onMomentumScrollBegin')}
onMomentumScrollEnd={() => console.log('onMomentumScrollEnd')}

Reference:

http://stackoverflow.com/a/33924777/2621748

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This is a hacky way to do it, while we wait for a native bridge (I found it in a React Native issue on GitHub.

https://github.com/facebook/react-native/issues/586#issuecomment-90826117

Basically you trigger an event in your parent component by listening to a navigation change in the WebView, and pass the name of a method (or whatever) via the document.title field.

Longer post coming (maybe, I find myself adding stuff on the go 😰)

You will also have to read the following to correctly send all the data you want from the WebView to the parent component.

http://stackoverflow.com/a/26603875/2621748

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When we have an input field on the bottom of the screen and we focus it, the keyboard covers the field and we will not know what we are typing inside.

My solution is a mix of two StackOverflow answers, which I will reference at the bottom. Also, apparently the React Native team tackled this issue in the 0.30.0 release. I tried it and it didn’t work the way I wanted, but maybe it was me doing something wrong.

Oh and of course this might not be the best way to do it at all, but it works for me and doesn’t look awful.

Click to see the code.

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Just leaving this here for when I have a little bit more time to make it a little nicer.

Using react-native-drawer to render the drawer.

The whole code of the two components I am using is below or in this gist.

Let’s start with a basic <Drawer> with a <ScrollView> with a <ListView> inside. Since we don’t know the width of the drawer (because of devices with different resolutions) we can’t just set a fixed width to the images (or whatever) inside the grid. Also with flexbox, I didn’t manage to get the desired result, because I needed squares.

So, to create a grid that has let’s say images that have a 50% width, you have to hack a bit.

Cutting here so it’s not messy, click to see the code and read more.