const normalizeInput = (value, previousValue) => {
if (!value) return value;
const currentValue = value.replace(/[^\d]/g, '');
if (!previousValue || value.length > previousValue.length) {
if (currentValue.length <= 3) return currentValue;
if (currentValue.length === 3) return `(${currentValue})`;
if (currentValue.length <= 6) return `(${currentValue.slice(0, 3)}) ${currentValue.slice(3)}`;
if (currentValue.length === 6) return `(${currentValue.slice(0, 3)}) ${currentValue.slice(3)}-`
return `(${currentValue.slice(0, 3)}) ${currentValue.slice(3, 6)}-${currentValue.slice(6, 10)}`;
}
};
const validateInput = value => {
let error = ""
if (!value) error = "Required!"
else if (value.length !== 14) error = "Invalid phone format. ex: (555) 555-5555";
return error;
};
class Form extends React.Component {
constructor() {
super();
this.state = { phone: "", error: "" };
this.handleChange = this.handleChange.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
this.handleReset = this.handleReset.bind(this);
}
handleChange({ target: { value } }) {
const normalized = normalizeInput(value, this.state.phone);
this.setState({ phone: normalized });
};
handleSubmit(e) {
e.preventDefault();
const error = validateInput(this.state.phone);
this.setState({ error }, () => {
if(!error) {
setTimeout(() => {
alert(JSON.stringify(this.state, null, 4));
}, 300)
}
});
}
handleReset() {
this.setState({ phone: "", error: "" });
};
render() {
return(
<form className="form" onSubmit={this.handleSubmit}>
<div className="input-container">
<p className="label">Phone:</p>
<input
className="input"
type="text"
name="phone"
placeholder="(xxx) xxx-xxxx"
value={this.state.phone}
onChange={this.handleChange}
/>
{this.state.error && <p className="error">{this.state.error}</p>}
</div>
<div className="btn-container">
<button
className="btn danger"
type="button"
onClick={this.handleReset}
>
Reset
</button>
<button className="btn primary" type="submit">Submit</button>
</div>
</form>
);
}
}
ReactDOM.render(
<Form />,
document.getElementById('root')
);
html {
font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";
font-size: 16px;
font-weight: 400;
line-height: 1.5;
-webkit-text-size-adjust: 100%;
background: #fff;
color: #666;
}
.btn {
color: #fff;
border: 1px solid transparent;
margin: 0 10px;
cursor: pointer;
text-align: center;
box-sizing: border-box;
padding: 0 30px;
vertical-align: middle;
font-size: .875rem;
line-height: 38px;
text-align: center;
text-decoration: none;
text-transform: uppercase;
transition: .1s ease-in-out;
transition-property: color,background-color,border-color;
}
.btn:focus {
outline: 0;
}
.btn-container {
text-align: center;
margin-top: 10px;
}
.form {
width: 550px;
margin: 0 auto;
}
.danger {
background-color: #f0506e;
color: #fff;
border: 1px solid transparent;
}
.danger:hover {
background-color: #ee395b;
color: #fff;
}
.error {
margin: 0;
margin-top: -20px;
padding-left: 26%;
color: red;
text-align: left;
}
.input {
display: inline-block;
height: 40px;
font-size: 16px;
width: 70%;
padding: 0 10px;
background: #fff;
color: #666;
border: 1px solid #e5e5e5;
transition: .2s ease-in-out;
transition-property: color,background-color,border;
}
.input-container {
width: 100%;
height: 60px;
margin-bottom: 20px;
display: inline-block;
}
.label {
width: 25%;
padding-top: 8px;
display: inline-block;
text-align: center;
text-transform: uppercase;
font-weight: bold;
height: 34px;
border-top-left-radius: 4px;
border-bottom-left-radius: 4px;
background: rgb(238, 238, 238);
}
.primary {
background-color: #1e87f0;
}
.primary:hover {
background-color: #0f7ae5;
color: #fff;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
<div id='root'>
</div>