React Native Input component takes ony numeric val

问题:

In React-Native project, I have an Input component from Native Base and I want to this component to take only numeric values 0-9 and give this field default value, I looked for other questions about this issue, I do not know maybe those answers are for 'textInput' component or somehow suggestions did not work for me? Can you help me please?

回答1:

try use

keyboardType="numeric"

source

回答2:

I grab your problem there is no attribute for Text Input to take numeric only. But I have two method for this, In first method you have to write the code for taking the value numeric this is hack but you can use it, the code is :

        <TextInput 
          style={styles.textInput}
          keyboardType = 'numeric'
          onChangeText = {(text)=> this.onChanged(text)}
          value = {this.state.myNumber}
        /> 

        onTextChanged(text) {
          // code to remove non-numeric characters from text
          this.setState({myNumber: text})
        }

For second Method use this:

回答3:

keyboardType="number-pad"

see source https://facebook.github.io/react-native/docs/textinput.html#keyboardtype

回答4:

You can use keyboardType = 'numeric' for numeric keyboard.

 <View style={styles.container}>
        <Text style={styles.txtStyle}>Enter numeric value</Text>
        <TextInput
          placeholder={'Enter number'}
          style={styles.textInputStyle}
          keyboardType="numeric"
          onChangeText={value => this.onChanged(value)}
          value={this.state.myNumber}
        />
      </View>

In first case punctuation marks are included ex:- . and -

Use regular expression to remove punctuation marks.

 onChanged(value) {

    this.setState({ myNumber: value.replace(/[- #*;,.<>\{\}\[\]\\\/]/gi, '') });
  }

Please check snack link

https://snack.expo.io/@vishal7008/1e004c