Automatically Add Asterisk to Required Fields

Written on 01/12/2021 02:55 PM

Written by Greg Potts

Tags: #Automation, #CSS, #Input, #JS, #Required, #Select, #Textarea

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It is ideal for required <input>, <textarea></textarea>, and <select></select> elements to have styling associated with them that shows that they are required visually. This is usually done in the form of an asterisk next to the end of the label's text. This can, and should, be done automatically so the developer does not have to think about it while developing the form. To do this, some CSS and JS is needed to be injected, which should be applied globally on some top-level global files.


 * Give any label with a required class a salmon colored "*"
label.required::after {
  color: salmon;
  content: " *";


 * Add a required class to labels whose inputs, selects, or textareas
 * have a required attribute on them
function addRequiredClassToLabels() {
  var requiredInputSelectTextareas = document.querySelectorAll(
  for (var i = 0; i < requiredInputSelectTextareas.length; i++) {
    var requiredInputSelectTextarea = requiredInputSelectTextareas[i];
    var parent = requiredInputSelectTextarea.parentElement;
    var label = parent.querySelector('label');
    if (label !== null) {
addRequiredClassToLabels(); // call it

This simple code allows any <input>, <textarea></textarea>, and <select></select> with a sibling <label> element within a parent container to have a red asterisk added to it.


The following are the results of applying the CSS and JS above.

  <code class="language-html hljs html">
  <div class="form-group my-2">
    <label for="required_field1">Required Input</label>
    <input type="text" class="form-control" name="required_field1" id="required_field1" required>
  <div class="form-group my-2">
    <label for="required_field2">Required Select</label>
    <select id="required_field2" name="required_field2" class="form-control" required>
      <option value=""></option>
      <option value="lorem">Lorem</option>
      <option value="ipsum">Ipsum</option>
  <div class="form-group my-2">
    <label for="required_field3">Required Textarea</label>
    <textarea id="required_field3" name="required_field3" rows="4" required class="form-control"></textarea>