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.
You may Also Like
How to add Typing Effect / Type Writer Effect to your text Using JavaScript
By Richard
/ June 5, 2022
How to add Typing Effect / Type Writer Effect to your text Using JavaScript Step 1) Add HTML: <h1>Typewriter</h1>...
Read More
How to Create a full screen video background using HTML, CSS
By Richard
/ May 22, 2022
Learn How to Create a full screen video background using HTML, CSS Adding HTML <div class="videobg"> <video src="https://adaptabiz.com/wp-content/uploads/2021/05/Pexels-Videos-1234162.mp4" loop muted...
Read More
How to Create an Off-Canvas Menu / Side Bar Navigation
By Richard
/ April 29, 2022
How to Create an Off-Canvas Menu / Side Bar Navigation Step 1) Add HTML: <div id="mySidenav" class="sidenav"> <a href="javascript:void(0)" class="closebtn"...
Read More
How To Create a Coming Soon Page / Maintenance Page Using HTML, CSS and JavaScript
By Richard
/ April 19, 2022
How To Create a Coming Soon Page / Maintenance Page Using HTML, CSS and JavaScript Step 1 : Adding...
Read More
How to Create Weight Converter using HTML and JavaScript
By Richard
/ April 2, 2022
How to Create Weight Converter using HTML and JavaScript For Converting Pounds to Kilogram Adding HTML : <h2>Weight Converter Pound...
Read More
How to create a Scroll indicator with CSS and JavaScript
By Richard
/ February 19, 2022
How to create a Scroll indicator with CSS and JavaScript Step 1) Add HTML: <div class="header"> <h2>Scroll Indicator</h2> <div...
Read More
How to Convert Color image to Black & White using CSS Filter ( Color to Grayscale)
By Richard
/ February 15, 2022
Many a times, there is necessity of converting Color image into Black and White or Grayscale. Here in this very...
Read More
How to Create a JavaScript Countdown Timer
By Richard
/ February 4, 2022
There are many a times, when you’re going to need a countdown clock for your project. You may have an...
Read More
How to Create an Avatar image with CSS
By Richard
/ January 20, 2022
How to Create an Avatar image with CSS Step 1) Add HTML: <h2>How to create Avatar Images with CSS</h2> <img...
Read More
How to Change Background Images on Scroll with CSS.
By Richard
/ January 13, 2022
How to Change Background Images on Scroll with CSS. Step 1) Add HTML: <div class="bg-image img1"></div> <div class="bg-image img2"></div>...
Read More