Category: React

Sometimes, we want to grow height of TextInput upon text wrapping with React Native.

In this article, we’ll look at how to grow height of TextInput upon text wrapping with React Native.

How to grow height of TextInput upon text wrapping with React Native?

To grow height of TextInput upon text wrapping with React Native, we can set the height of the TextInput to the content’s height when the content size changes.

For instance, we write:

import * as React from 'react';
import { View, TextInput } from 'react-native';
import Constants from 'expo-constants';
import AssetExample from './components/AssetExample';
import { Card } from 'react-native-paper';

export default function App() {
  const [height, setHeight] = React.useState(30);

  return (
    <View>
      <TextInput
        multiline
        style={{ height }}
        onContentSizeChange={(event) => {
          setHeight(event.nativeEvent.contentSize.height);
        }}
      />
    </View>
  );
}

to set the onContentSizeChange prop to a function that calls setHeight with event.nativeEvent.contentSize.height to set height to event.nativeEvent.contentSize.height.

Then we set the height style of the TextInput to height.

Now as we type, the TextInput will change size to fit the input value.

Conclusion

To grow height of TextInput upon text wrapping with React Native, we can set the height of the TextInput to the content’s height when the content size changes.

Sometimes, we want to set the minimum width or height in React Native.

In this article, we’ll look at how to set the minimum width or height in React Native.

How to set the minimum width or height in React Native

To set the minimum width or height in React Native, we can set the minWidth and minHeight properties.

For instance, we write:

import * as React from 'react';
import { View, Text } from 'react-native';
import Constants from 'expo-constants';
import AssetExample from './components/AssetExample';
import { Card } from 'react-native-paper';
import dismissKeyboard from 'react-native-dismiss-keyboard';

export default function App() {
  return (
    <View
      style={{
        minWidth: '20%',
        maxWidth: 500,
        minHeight: '10%',
        maxHeight: 150,
      }}>
      <Text>hello world</Text>
    </View>
  );
}

to set the min width with minWidth and min height with minHeight.

We can also set the max width with maxWidth and max height with maxHeight.

Conclusion

To set the minimum width or height in React Native, we can set the minWidth and minHeight properties.

Sometimes, we want to identify return key press in React Native.

In this article, we’ll look at how to identify return key press in React Native.

How to identify return key press in React Native?

To identify return key press in React Native, we can set the onKeyPress prop to a function to listen for which key is pressed.

For instance, we write:

import * as React from 'react';
import { View, TextInput } from 'react-native';
import Constants from 'expo-constants';
import AssetExample from './components/AssetExample';
import { Card } from 'react-native-paper';
import dismissKeyboard from 'react-native-dismiss-keyboard';

export default function App() {
  const handleKeyDown = (e) => {
    if (e.nativeEvent.key === 'Enter') {
      dismissKeyboard();
    }
  };

  return (
    <View style={{ padding: 30 }}>
      <TextInput
        autoCapitalize="sentences"
        autoCorrect
        keyboardType="default"
        returnKeyType="done"
        onKeyPress={handleKeyDown}
        placeholder="Enter text here..."
      />
    </View>
  );
}

to define the handleKeyDown function that get the key pressed with e.nativeEvent.key.

And it’s equal to 'Enter', then we call dismissKeyboard to remove the keyboard from the screen.

We then set onKeyPress to handleKeyDown to make handleKeyDown the event listener for the key press event.

Conclusion

To identify return key press in React Native, we can set the onKeyPress prop to a function to listen for which key is pressed.

Sometimes, we want to render a shadow with React Native.

In this article, we’ll look at how to render a shadow with React Native.

How to render a shadow with React Native?

To render a shadow with React Native, we can set some shadow styles.

For instance, we write:

import * as React from 'react';
import { View, Text } from 'react-native';
import Constants from 'expo-constants';
import AssetExample from './components/AssetExample';
import { Card } from 'react-native-paper';

export default function App() {
  return (
    <View
      style={{
        padding: 10,
        margin: 10,
        shadowColor: '#000',
        shadowOffset: { width: 3, height: 2 },
        shadowOpacity: 0.2,
        elevation: 5,
      }}>
      <Text>hello world</Text>
    </View>
  );
}

to set the shadowColor, shadowOffset and shadowOpacity to add a shadow to the View.

shadowOffset adds the shadow effect.

shadowColor sets the shadow color.

And shadowOpacity sets the shadow opacity.

Conclusion

To render a shadow with React Native, we can set some shadow styles.

To format a date string in React Native, we can use moment.js.

For instance, we write:

import * as React from 'react';
import { View, Text } from 'react-native';
import Constants from 'expo-constants';
import AssetExample from './components/AssetExample';
import { Card } from 'react-native-paper';
import moment from 'moment';

export default function App() {
  return (
    <View>
      <Text>{moment(new Date(2022, 1, 1)).format('YYYY-MM-DD')}</Text>
    </View>
  );
}

to call moment with a JavaScript date object to create a moment object with the same date.

Then we call format with a format string to return a date string with the given date.

Therefore, we see 2022-02-01 displayed.