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<TextInput
style={styles.textInput}
keyboardType='numeric'
onChangeText={(text)=> this.onChanged(text)}
value={this.state.myNumber}
maxLength={10} //setting limit of input
/>
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<TextInput
// KEYBOARD TYPE NUMERIC
keyboardType='numeric'
onChangeText={(text)=> this.onChanged(text)}
value={this.state.myNumber}
/>
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const onChanged = (text) => {
let newText = '';
let numbers = '0123456789';
for (var i=0; i < text.length; i++) {
if(numbers.indexOf(text[i]) > -1 ) {
newText = newText + text[i];
}
else {
alert("please enter numbers only");
}
}
setNumber(newText);
}