In this tutorial we will see how to Check If Input Field is Empty in jQuery. The jQuery val() method is used with submit() method and addClass method to make sure that input field is not empty on form submission.
Table of Contents
HTML Code
HTML code is given below, in this html code there is one HTML form element with text type input field and a submit type input field.
<!DOCTYPE html>
<html lang="en">
<head>
<title>jQuery Check If Input Field is Empty</title>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
</head>
<body>
<form id="form">
<input type="text" name="name" placeholder="Name:">
<input type="submit">
</form>
</body>
</html>
CSS Code
CSS code is given below, CSS class ".empty" is used to highlight the input field, if it is empty on form submission.
.empty {
border: 1px solid red;
}
JQuery Code
JQuery Code is given below, this code is further explained in detail.
<script>
$('#form').submit(function() {
if(!$("#form input[type=text]").val())
{
$("#form input[type=text]").addClass("empty");
return false;
}
});
</script>
Demo
jQuery submit() Method
The jQuery submit() Method is used to trigger the submit event for the selected HTML element or to attach the submit event with the selected HTML element.
In this example submit event is attached with HTML form with id "form". The function defined inside submit method will be executed once the form is submitted.
The jQuery submit() method is often used for form validation.
jQuery val() method
The jQuery val() method is used to set or get the value of the value attribute of HTML element.
In this example jQuery val() method is used with if statement to check if the value of input element exists or not.
The logical NOT operator will make the if statement true, only if input field is empty. In this case the code inside the if statement will be executed. Otherwise the form will be submitted.
jQuery addClass() method
The code inside the if statement is used to stop the form submission and to highlight the input field.
The jQuery addClass() method is used to add the class "empty" to the input element to highlight it.
The return false; is used to stop the form submission.
Video Tutorial
Watch video tutorial on how to Check If Input Field is Empty in jQuery.