jQuery addClass example

Change class name on click in jQuery

by Dmitri Ganenco

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="banner-message">
  <button type="button" id='add-field'>
  Add New Field
  </button>
  <input class="itextarea" />
  <p class='help'> </p>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#banner-message {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  font-size: 25px;
  text-align: center;
  transition: all 0.2s;
  margin: 0 auto;
  width: 300px;
}

button {
  background: #0084ff;
  border: none;
  border-radius: 5px;
  padding: 8px 14px;
  font-size: 15px;
  color: #fff;
}

#banner-message.alt {
  background: #0084ff;
  color: #fff;
  margin-top: 40px;
  width: 200px;
}

#banner-message.alt button {
  background: #fff;
  color: #000;
}

JavaScript

$(function() {
  $('#add-field').on('click', function() {

    $('#banner-message').append(`<input class="itextarea" />`);

  });

  $('body').on('input', '.itextarea', function(e) {
    var textAreasCount = $('body').find('.itextarea').length;
    if (textAreasCount === 1) {
      return;
    }
    var words = this.value.match(/\S+/g).length;

    if (words <= 5) {
      $('p.help').empty();
      return;
    }

    var trimmed = $(this).val().split(/\s+/, 5).join(' ');

    $(this).val(trimmed);
    $('p.help').empty().text('You can only add 5 words per field.');

  });
});