jQuery addClass example

Change class name on click in jQuery

by nate

HTML

<input type="tel" name="foo" />
<input type="tel" name="bar" />
<input type="tel" name="baz" />

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;
}

input.invalid {
  border: 5px solid red;
}

JavaScript

var $telephoneInputs = $('input[type="tel"]');

$telephoneInputs.each(function (i, item) {
console.log(item, i);
	var $item = $(item);
  var name = $item.attr('name');
  
  $item.attr('name', name + '_input');
  
  var hiddenInputName = name;
  
  $item.on('blur', function (event) {
  	var $target = $(event.currentTarget);
    
    if ($target.val() === '') {
    	$target.addClass('invalid');
    } else {
    	$target.removeClass('invalid')
    }
  })
});