numberOfLines TextInput property not working

Question

I have created an application in react-native and I have an option to chat in messages option. when I click inside TextInput and type two lines, the upper line gets hidden. To fix this I saw in the docs numberOfLines property but it did not work.

Here is my code:

<TextInput

                ref='textInput'
                multiline={true}
                numberOfLines: {5}
                onChangeText={this.onChangeText}
                style={[styles.textInput, {height: context.props.textInputHeight}]}
                placeholder={context.props.placeholder}
                placeholderTextColor="#5A5A5A"
                value={context.state.text}/>

I tried it in getDefaultProps function too:

getDefaultProps() {
    return {
      placeholder: 'Type a message...',
      navHeight: 70,
      textInputHeight: 44,
      numberOfLines:5,
      maxHeight: Screen.height,
    };
  },

But did not worked.

Solution 1

To resume:

<TextInput
  ...
  numberOfLines={Platform.OS === 'ios' ? null : numberOfLines}
  minHeight={(Platform.OS === 'ios' && numberOfLines) ? (20 * numberOfLines) : null}
/>

Solution 2

You can use maxHeight and minHeight to accept what you want. For standard text fontSize, giving maxHeight={60} will make TextInput scrollable after 3 lines. This is good for IOS - for Android you can use numberOfLines prop.

Solution 3

You have numberOfLines: {5}, should be numberOfLines={5}. Or is that just a typo only in SO?

In addition, styling textAlignVertical: 'top' is also recommended.

Comments

[Ankush Rishi]

It works when I remove the height in style style={[styles.textInput, {height: context.props.textInputHeight}]} and If I add textAlignVertical: 'top' it does not display the text I write in the textbox

[Ankush Rishi]

yes now a days we can use maxHeight property but at that time when I asked this questions more than 2 years ago, it was not there in the docs. Thanks for the update!

[kojow7]

What exactly does the number 20 indicate?

[Made in Moon]

@kojow7 it's a height for each line

[Bravo]

hardcoding 20 for each line is absolutely incorrect. On Android numberOfLines calculates automatically how much height is necessary for each line thus the textinput looks perfect