jQuery addClass example

Change class name on click in jQuery

HTML

<form>
Deseja anonimato?
    <input type="checkbox" id="anonimo">
    
    <div id="containerInput">
      <input type="text" id="nome" placeholder="seu nome">
      <input type="text" id="email" placeholder="seu email">
      <input type="text" id="telefone" placeholder="seu telefone">
    </div>
</form>

JavaScript

$('#anonimo').click(function () {
	var texto = this.checked ? 'anonimo' : '';

	$('div[id="containerInput"]').find('input:text').each(function (i, obj) {
  	$(obj).val(texto);
  });
});