How to add form validation for empty input fields with JavaScript.
Step 1 : Create a Simple input field in HTML
<h2>Input field validation via JavaScript</h2> <p>Press Submit button without entering any text.</p> <form name="myForm" action= "/action_page.php" onsubmit="return validateForm()" method="post" required> Name: <input type="text" name="fname"> <input type="submit" value="Submit"> </form>
Step 2: Add JavaScript
function validateForm() {
var x = document.forms["myForm"]["fname"].value;
if (x == "" || x == null) {
alert("Name must be filled out");
return false;
}
}
Output and Full Code
How to add form validation for empty input fields with JavaScript.
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