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Validation in React TextBox component

29 Sep 2022 / 1 minute to read

The TextBox supports three types of validation styles namely error, warning, and success. These states are enabled by adding corresponding classes .e-error, .e-warning, or .e-success to the input parent element.

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index.jsx
index.tsx
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import * as React from "react";
import * as ReactDOM from "react-dom";
export default class Default extends React.Component {
    render() {
        return (<div>
        <div className="e-input-group e-warning">
        <input className="e-input" type="text" placeholder="Input with warning" onFocus={this.onInputFocus} onBlur={this.onInputBlur}/>
        </div>

        <div className="e-input-group e-error">
        <input className="e-input" type="text" placeholder="Input with error" onFocus={this.onInputFocus} onBlur={this.onInputBlur}/>
        </div>

        <div className="e-input-group e-success">
        <input className="e-input" type="text" placeholder="Input with success" onFocus={this.onInputFocus} onBlur={this.onInputBlur}/>
        </div>
    </div>);
    }
    onInputFocus(args) {
        if (!args.target.parentElement.classList.contains('e-input-in-wrap')) {
            args.target.parentElement.classList.add('e-input-focus');
        }
        else {
            args.target.parentElement.parentElement.classList.add('e-input-focus');
        }
    }
    onInputBlur(args) {
        if (!args.target.parentElement.classList.contains('e-input-in-wrap')) {
            args.target.parentElement.classList.remove('e-input-focus');
        }
        else {
            args.target.parentElement.parentElement.classList.remove('e-input-focus');
        }
    }
}
ReactDOM.render(<Default />, document.getElementById('input-container'));
Copied to clipboard
import * as React from "react";
import * as ReactDOM from "react-dom";

export default class Default extends React.Component {

public render() {
   return (
    <div>
        <div className="e-input-group e-warning">
        <input className="e-input" type="text" placeholder="Input with warning" onFocus = {this.onInputFocus} onBlur = {this.onInputBlur} />
        </div>

        <div className="e-input-group e-error">
        <input className="e-input" type="text" placeholder="Input with error" onFocus = {this.onInputFocus} onBlur = {this.onInputBlur} />
        </div>

        <div className="e-input-group e-success">
        <input className="e-input" type="text" placeholder="Input with success" onFocus = {this.onInputFocus} onBlur = {this.onInputBlur}/>
        </div>
    </div>
);
}


public onInputFocus(args: React.FocusEvent) {
    if (!((args.target as HTMLElement).parentElement as HTMLElement).classList.contains('e-input-in-wrap')) {
        ((args.target as HTMLElement).parentElement as HTMLElement).classList.add('e-input-focus');
    } else {
        (((args.target as HTMLElement).parentElement as HTMLElement).parentElement as HTMLElement).classList.add('e-input-focus')
    }
}

public onInputBlur(args: React.FocusEvent) {
    if (!((args.target as HTMLElement).parentElement as HTMLElement).classList.contains('e-input-in-wrap')) {
        ((args.target as HTMLElement).parentElement as HTMLElement).classList.remove('e-input-focus');
    } else {
        (((args.target as HTMLElement).parentElement as HTMLElement).parentElement as HTMLElement).classList.remove('e-input-focus');
    }
}
}

ReactDOM.render(<Default />, document.getElementById('input-container'));
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