CODEWITHSUNDEEP
reactjsreact-native
saiRam89
saiRam89

Reputation: 375

React native textinput numeric issue

Need help, i was just placed material-ui textfield in react native and I have set:

keyboardType: {numeric}

Its works fine but when I entered 30,000 it's showing NaN I want to restrict comma(,) and dot(.) in keyboard. When I type amount it will calculate and show result in text.

<TextField 
     onChange={(event)=>this.handle(event.nativeEvent.text)}
     label='Amount'
     value={this.state.amount}
     keyboardType = 'numeric'
     enablesReturnKeyAutomatically={true}>
</TextField>

Upvotes: 0

Views: 3047

Answers (2)

jpuntd
jpuntd

Reputation: 902

The displayed value will always be this.state.amount. So if you change the value to discard everything but numerical digits, there will only be digits on the screen.

One extra thing you could do is change the keyboardType to 'number-pad', but I don't know how cross-device that is.

Use the following... 

<TextField 
     onChange={(event)=>this.handleChange(event.nativeEvent.text)}
     label='Amount'
     value={this.state.amount}
     keyboardType = 'number-pad'
     enablesReturnKeyAutomatically={true}>
</TextField>  

handleChange(event) {

    this.setState({amount: event.target.value.replace(/[^0-9]/g,'')});
}

Upvotes: 1

Mayank Shukla
Mayank Shukla

Reputation: 104529

Try this:

Since you are using the controlled component, means storing the field value in state variable, So to restrict the user from entering input , and ., put the check inside onChange method, if entered value is integer then only update the state value otherwise not.

Like this:

<TextField 
    onChange={event => this.handle(event.nativeEvent.text)}
    label='Amount'
    value={this.state.amount}
    keyboardType = 'numeric'
    enablesReturnKeyAutomatically={true}>
</TextField> 

handle(value){
    if(/^\d+$/.test(value))
        this.setState({amount: value})
}

Upvotes: 0

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