How to write a logical operator?

Question

JavaScript

let state = {fieldActive: false};

<div className={`form-textbox-label ${this.state.fieldActive <b><i>(Если true, то вернуть 'field-active') </i>'</b>field-active'}`}></div>

Answer 1

I advise you to put a convenient classnames library for these purposes . With it, similar constructions (and much more complex ones) look simpler:

const classNames = require('classnames');
...
<div className={classNames( "form-textbox-label", {
   "field-active": this.state.fieldActive
})}></div>