Form validation is a critical component in the ever-changing field of web development that helps to ensure an intuitive and error-free user experience. It guarantees that the information users submit is correct and satisfies the necessary requirements. Making certain that input fields are not left empty is one frequent validation duty.

jQuery is still a strong and popular JavaScript library for processing user input and providing interactivity to online projects. It is the best option for implementing client-side validation because of its flexibility and ease of use, especially when it comes to checking for empty input fields.

This post will examine many methods and approaches to validate empty input fields in online forms, delving into the world of jQuery.

Let’s begin by learning how to validate empty fields in HTML and verify empty input fields in jQuery.

Example:

In HTML, you wish to impose validation on any input field that isn’t empty. Using the necessary property on your HTML input element can help you accomplish this. Here’s one instance.

<form>
  <label for="inputField">Input Field:</label>
  <input type="text" id="inputField" name="inputField" oninput="validateInput(this)" required>
  <span id="inputError" style="color: red;"></span>
  <input type="submit" value="Submit">
</form>

JavaScript:

function validateInput(inputElement) {
  const inputValue = inputElement.value.trim(); // Remove leading and trailing whitespace

  if (inputValue === '') {
    document.getElementById('inputError').textContent = 'Input cannot be empty';
    inputElement.setCustomValidity('Input cannot be empty');
  } else {
    document.getElementById('inputError').textContent = '';
    inputElement.setCustomValidity('');
  }
}