Adjust the transparency of a selected item in a dropdown menu

Within my code, I have several select elements structured as follows:

<li>
    <select>
        <option>choose something</option>
        <option value="1">something</option>
        <option value="2">anything</option>
    </select>
</li>
<li>
    <select>
        <option>choose something</option>
        <option value="1">something</option>
    </select>
</li>
<li>
    <select>
        <option>choose something</option>
        <option value="1">something</option>
    </select>
</li>

My goal is to adjust the opacity of each select element to 0.5 if it has a selected option after the page has loaded. Initially, I attempted to achieve this using jQuery:

$('select').each(function(select) {
    $('select option').each(function() {
        if($(this).is(':selected')) {
            select.css({ opacity: 0.5 });
        }
    });
});

However, this approach did not yield the desired results.

javascriptjquerycss

Answer №1

Ensure that you set an empty value as your default option. Then, attach a change event to all your select elements, triggering it once during page load (in case the selected value is not default), and utilize CSS for adjusting hover opacity.

 $('select').on('change', function() {
   if (this.value) {
     $(this).css('opacity', '0.5');
   } else {
     $(this).css('opacity', '1');
   }
 }).change();
select:hover {
  opacity: 1!important
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<ul>
  <li>
    <select>
      <option value="">Please select an option</option>
      <option value="1">Option 1</option>
      <option value="2">Option 2</option>
    </select>
  </li>
  <li>
    <select>
      <option value="">Please select an option</option>
      <option value="1" selected="selected">Option 1</option>
    </select>
  </li>
  <li>
    <select>
      <option value="">Please select an option</option>
      <option value="1">Option 1</option>
    </select>
  </li>
</ul>

Answer №2

It is recommended to utilize the change event rather than employing two .each functions.

function checkNotEmpty(element) {
  return ($('option:selected', element).attr('value') || '').length;
}

$('select').on('change mouseout',function () {
  $(this).css({ opacity: checkNotEmpty(this) ? 0.5 : 1 });
}).on('mouseover', function () {
  $(this).css({ opacity: 1 })
}).change();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul>
  <li>
    <select>
      <option>choose an option</option>
      <option value="1">something</option>
      <option value="2">anything</option>
    </select>
  </li>
  <li>
    <select>
      <option>choose an option</option>
      <option value="1">something</option>
    </select>
  </li>
  <li>
    <select>
      <option>choose an option</option>
      <option value="1">something</option>
    </select>
  </li>
</ul>

Answer №3

$('select').forEach(function(select) {
    $('select option').forEach(function() {
        if($(this).is(':checked')) {
            $(this).parent.css('opacity', '0.5');
        }
    });
});

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