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How to conditionally apply class attributes?

1 Answer

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You shouldn't use curly braces inside quotes because it is going to be evaluated as a string.

<div className="btn-panel {this.props.visible ? 'show' : 'hidden'}">

Instead you need to move curly braces outside (don't forget to include spaces between class names):

<div className={'btn-panel ' + (this.props.visible ? 'show' : 'hidden')}>

Template strings will also work:

<div className={`btn-panel ${this.props.visible ? 'show' : 'hidden'}`}>
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