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HTML 

              
                
<h1>Pay your bill</h1>
<div>
  <div class="group-label">
    <strong>Select an amount</strong>
  </div>
  <div>
    <div>
      <label for="alpha">
        <input type="radio" name="options" id="alpha" value="full">
        Pay in full: $386.00
      </label>      
    </div>
    <div>
      <label for="bravo">
        <input type="radio" name="options" id="bravo" value="other">
        <input type="text" placeholder="Other Amount" id="other-amount" />
      </label>      
    </div>
  </div>
</div>

<button class="submit" disabled>
  Pay my bill
</button>


<h2>Why this is a problem</h2>

<p>This is what most developers will do. You must define good UX for people using a keyboard or screen reader.</p>

<p>When the "other amount" field is focused, it also selects the radio button. This creates a keyboard trap, meaning someone using a keyboard cannot advance.</p>

<p>The second radio button will have no discernable name.</p>

<p>Placeholder text cannot be used as a name for an input field.</p>

<p>It is invalid HTML to put an interactive control or input field inside a label</p>
!

CSS 

              
                *:focus {
  outline-offset: 4px;
}

html {
  background-color: #eee;
  font-family: arial;
}
body {
  max-width: 420px;
  margin: 0px auto;
}

.group-label {
  margin-bottom: .5rem;
}

input[type=radio] {
  width: 1.5rem;
  height: 1.5rem;
  cursor: pointer;
}

input[type=text] {
  font-size: 1rem;
  line-height: 1.5rem;
}

label {
  display: grid;
  grid-template-columns: 3rem 1fr;
  padding: 1rem;
  align-items:  center;
  margin-bottom: .25rem;
  background: #fff;
  line-height: 2rem;
  border-radius: .5rem;
  cursor: pointer;

}

button {
  padding: 1rem 2rem;
  font-size: 1rem;
  color: #fff;
  line-height: 2rem;
  font-weight: bold;
  margin-top: 1rem;
  background: #2978F6;
  border: none;
  border-radius: 3rem;
  transition: .2s;
  cursor: pointer;
  
  &:active {
    background: #1F5EC1;
  }
  
  &:disabled {
    background: #999;
  }
}
!

JS 

              
                function checkOtherAmount() {
  if ($("input#other-amount").is(":placeholder-shown")) {
    // The placeholder is displayed
    // alert("The placeholder is displayed");
    $(".submit").attr('disabled', 'disabled');
  } else {
    // The placeholder is not displayed
    $(".submit").removeAttr('disabled');
  }
}

// If other amount field is focused/tapped, change radio choice
$('#other-amount').focus(function() {
  $('#bravo').prop('checked', true);
  checkOtherAmount();
});

// On starting to type, enable the submit button
$('input#other-amount').keypress(function() {
  checkOtherAmount();
});

$( "input#other-amount" ).on( "blur", function() {
  checkOtherAmount(); 
});


$('input[name="options"]').on('change', function() {
  checkOtherAmount();
  var $payment =  $('input[name="options"]:checked').val();
  
  if($payment == "other" ) {
    checkOtherAmount();
    $('#other-amount').focus(); // Focus the input field
  } else {
    $(".submit").removeAttr('disabled')
  }  
});

$(".submit").click(function() {
  alert("Great success");
});
!
999px

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