mobile number validation accept numeric

Allow only numbers in Input in React | Regex and Number

Use value and onChange property of input field to allow only numbers in text-box.
Inside the onChange handle check whether the entered value is valid number or not. Update the state only when entered value is a valid number. See the below example to do this.

Example 1,
You can use Number and conditionally change state.

import React, { Component } from 'react';

class AllowOnlyNumber extends Component {
    constructor(props) {
        super(props);

        this.state = {
            telephone: ''
        };
        this.onHandleTelephoneChange = this.onHandleTelephoneChange.bind(this);
    }

    onHandleTelephoneChange = e => {
        let telephone = e.target.value;

        if (!Number(telephone)) {
            return;
        }
        this.setState({ [e.target.name]: telephone });
    };

    render() {
        return (
            <>
                <label>Allow only numbers in Input (React) : </label>
                <input
                    type="tel" name="telephone" placeholder="Telephone Number"
                    value={this.state.telephone}
                    onChange={this.onHandleTelephoneChange}
                />
            </>
        );
    }
}

export default AllowOnlyNumber;

Example 2,

You can use regex and conditionally change state.
import React, { Component } from 'react';

class AllowOnlyNumber extends Component {
    constructor(props) {
        super(props);
        this.onHandleTelephoneChange = this.onHandleTelephoneChange.bind(this);  
        this.state = {
            telephone: '',
            regexp : /^[0-9\b]+$/
        }   
    }
    
    onHandleTelephoneChange = e => {
        let telephone = e.target.value;

        // if value is not blank, then test the regex
        if (telephone === '' || this.state.regexp.test(telephone)) {
            this.setState({ [e.target.name]: telephone })
        }
    };

    render() {
        return (
            <>
                <label>Allow only numbers in Input (React) : </label>
                <input
                    type="tel" name="telephone" placeholder="Telephone Number"
                    value={this.state.telephone}
                    onChange={this.onHandleTelephoneChange}
                />
            </>
        );
    }
}

export default AllowOnlyNumber;

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